CN108474281B - Reductant supply system and control method thereof - Google Patents
Reductant supply system and control method thereof Download PDFInfo
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- CN108474281B CN108474281B CN201680077364.7A CN201680077364A CN108474281B CN 108474281 B CN108474281 B CN 108474281B CN 201680077364 A CN201680077364 A CN 201680077364A CN 108474281 B CN108474281 B CN 108474281B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a reducing agent supply system, including: a urea decomposition chamber into which a fluid flows; a urea injection nozzle that injects urea into the urea decomposition chamber; a discharge temperature sensor that detects a temperature of the fluid discharged from the urea decomposition chamber; and a control unit that controls an amount of urea injected into the urea decomposition chamber through the urea injection nozzle by comparing a discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature.
Description
Technical Field
The present invention relates to a reducing agent supply system, and more particularly, to a reducing agent supply system for reducing nitrogen oxides included in exhaust gas and a control method thereof.
Background
Generally, power generation devices that produce power by burning a fuel emit exhaust gases. Such exhaust gas includes nitrogen oxides. If discharged to the outside without additional treatment for purifying or reducing nitrogen oxides, harmful effects are exerted on the human body and the environment.
Therefore, Urea (Urea) is supplied in order to reduce nitrogen oxides included in the exhaust gas discharged from the power generation device and then discharged to the outside. The urea is thermally decomposed by heat of the exhaust gas to generate a reducing agent.
However, such urea has a problem that when the amount of heat of the exhaust gas is low, a by-product (Deposit) is generated, and the generated by-product blocks the injection nozzle or prevents the supply of the reducing agent through the injection pipe.
Further, in the case where an appropriate reducing agent cannot be generated because the injected urea is not decomposed, it is difficult for the reducing agent supply system to effectively reduce nitrogen oxides and discharge them to the outside.
Disclosure of Invention
Technical problem
Embodiments of the present invention provide a reducing agent supply system capable of effectively decomposing urea and a control method thereof.
Technical scheme
According to an embodiment of the present invention, a reducing agent supply system includes: a urea decomposition chamber into which a fluid flows; a urea injection nozzle that injects urea into the urea decomposition chamber; a discharge temperature sensor that detects a temperature of the fluid discharged from the urea decomposition chamber; and a control unit that controls an amount of urea injected into the urea decomposition chamber through the urea injection nozzle by comparing a discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature.
Further, the control portion may decrease the urea injection amount of the urea injection nozzle when the discharge temperature detected by the discharge temperature sensor is lower than a first reference temperature, and may stop the urea injection from the urea injection nozzle when the discharge temperature re-detected by the discharge temperature sensor is lower than a second reference temperature lower than the first reference temperature after the urea injection amount is decreased.
Alternatively, the reducing agent supply system may further include a heat quantity adjusting portion that adjusts a flow rate or a temperature of the fluid flowing into the urea decomposition chamber, and the control portion may control the heat quantity adjusting portion to adjust the heat quantity of the fluid flowing into the urea decomposition chamber when the discharge temperature detected by the discharge temperature sensor is lower than a first reference temperature, and may stop the urea injection from the urea injection nozzle when the discharge temperature re-detected by the discharge temperature sensor is lower than a second reference temperature lower than the first reference temperature.
The reducing agent supply system may further include an inflow temperature sensor that detects a temperature of the fluid flowing into the urea decomposition chamber, and the control unit may control the heat amount adjustment unit to increase a flow rate of the fluid to the urea decomposition chamber when the inflow temperature detected by the inflow temperature sensor exceeds a set inflow temperature after controlling the heat amount adjustment unit, and may compare a discharge temperature re-detected by the discharge temperature sensor with the second reference temperature when the inflow temperature detected by the inflow temperature sensor is equal to or lower than the set inflow temperature.
The reducing agent supply system may further include an inflow flow rate sensor that detects a flow rate of the fluid flowing into the urea decomposition chamber, wherein the control unit may stop urea injection from the urea injection nozzle when the inflow flow rate of the fluid detected by the inflow flow rate sensor exceeds a preset inflow flow rate of the fluid after the heat quantity adjustment unit is controlled to increase the flow rate of the fluid flowing into the urea decomposition chamber, and the control unit may compare the discharge temperature re-detected by the discharge temperature sensor with the second reference temperature when the inflow flow rate of the fluid detected by the inflow flow rate sensor is equal to or less than the preset inflow flow rate of the fluid.
Alternatively, the control method of the reducing agent supply system of the embodiment of the invention includes: determining an amount of urea injected; calculating an amount of heat required to decompose the determined urea injection amount; a step of supplying the calculated thermal fluid to a urea decomposition chamber; injecting urea into the urea decomposition chamber; detecting a discharge temperature of the fluid discharged from the urea decomposition chamber; comparing the detected discharge temperature with a first reference temperature; reducing an amount of urea injected into the urea decomposition chamber when the detected discharge temperature is lower than the first reference temperature; detecting a discharge temperature of the fluid discharged from the urea decomposition chamber after reducing the urea injection amount; comparing the re-detected discharge temperature with a second reference temperature lower than the first reference temperature; and stopping urea injection into the urea decomposition chamber when the re-detected discharge temperature is lower than a second reference temperature.
Alternatively, a control method of a reducing agent supply system according to another embodiment of the present invention includes: determining an amount of urea injected; calculating an amount of heat required to decompose the determined urea injection amount; a step of supplying the calculated thermal fluid to a urea decomposition chamber; injecting urea into the urea decomposition chamber; detecting a discharge temperature of the fluid discharged from the urea decomposition chamber; comparing the detected discharge temperature with a first reference temperature; adjusting the amount of heat of the fluid supplied to the urea decomposition chamber when the detected discharge temperature is lower than the first reference temperature; adjusting the heat quantity of the fluid, and then detecting the discharge temperature of the fluid discharged from the urea decomposition chamber; and stopping urea injection into the urea decomposition chamber when the re-detected discharge temperature is lower than a second reference temperature lower than the first reference temperature.
Further, the control method may further include, before re-detecting a discharge temperature of the fluid discharged from the urea decomposition chamber: a step of detecting an inflow temperature of the fluid flowing into the urea decomposition chamber; comparing the detected inflow temperature with a set inflow temperature; and a step of increasing a flow rate of the fluid flowing into the urea decomposition chamber when the detected inflow temperature exceeds the set inflow temperature.
Further, the control method may further include, after increasing the flow rate of the fluid flowing into the urea decomposition chamber: detecting an inflow rate of a fluid flowing into the urea decomposition chamber; comparing the detected inflow rate with a set inflow rate; and stopping urea injection into the urea decomposition chamber when the detected inflow flow rate exceeds the set inflow flow rate.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the embodiment of the invention, the reducing agent supply system and the control method thereof can effectively decompose urea and prevent the generation of by-products.
Drawings
Fig. 1 is a diagram showing a reducing agent supply system of an embodiment of the present invention.
Fig. 2 is a sequence diagram showing a control procedure of the control section of the first embodiment of fig. 1.
Fig. 3 is a sequence diagram showing a control procedure of the control section of the second embodiment of fig. 1.
Fig. 4 is a sequence diagram showing a control procedure of the control section of the third embodiment of fig. 1.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily carry out the embodiments. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.
It is to be noted that the drawings are diagrammatic and not drawn to scale. Relative dimensions and proportions of parts shown in the figures have been shown exaggerated or reduced in size for the sake of clarity and convenience in the drawings, and any dimensions are exemplary only and not limiting. In order to achieve similar features, the same reference numerals are used for the same structures, elements, or components appearing in two or more drawings.
The embodiments of the present invention specifically show desirable embodiments of the present invention. As a result, various variations of the illustration are expected. Thus, embodiments are not limited to the particular form of the illustrated region, and may include variations in form resulting from manufacturing, for example.
A reducing agent supply system 101 according to an embodiment of the present invention will be described with reference to fig. 1.
As shown in fig. 1, reducing agent supply system 101 includes urea decomposition chamber 100, urea injection nozzle 200, discharge temperature sensor 300, and control unit 400.
The fluid flows into the urea decomposition chamber 100. Specifically, in the case of the urea decomposition chamber 100, the inside may be formed in a hollow shape. Further, an inlet for the fluid may be formed on one side of the urea decomposition chamber 100, and an outlet for the fluid may be formed on the other side of the urea decomposition chamber 100.
Further, the fluid supplied to the urea decomposition chamber 100 has heat (thermal energy). For example, the fluid having heat supplied to the urea decomposition chamber 100 may branch a portion of the exhaust gas to flow into the urea decomposition chamber 100.
The Urea injection nozzle 200 injects Urea (Urea) into the Urea decomposition chamber 100. Specifically, the urea injection nozzle 200 may be disposed at one side of the urea decomposition chamber 100 to inject urea to the fluid passing through the urea decomposition chamber 100. Such urea may be thermally decomposed by heat of the fluid while passing through the inside of the urea decomposition chamber 100 to generate a reducing agent.
The discharge temperature sensor 300 detects the temperature of the fluid discharged from the urea decomposition chamber 100. Specifically, the discharge temperature sensor 300 may be provided at the discharge port of the urea decomposition chamber 100 or at the reducing agent supply passage 810 connected adjacent to the discharge port. The reducing agent supply passage 810 supplies fluid having heat to the urea decomposition chamber 100 to generate a reducing agent, and supplies the reducing agent to the selective catalytic reduction device 50. Specifically, the selective catalytic reduction device 50 includes a reactor 20 in which a catalyst 21 is provided, and an exhaust gas flow path 10 in which the reactor 20 is provided.
Specifically, the reducing agent supply passage 810 is connected to a reducing agent injection member 820 provided in the exhaust passage 10 in front of the reactor 20, and supplies the generated reducing agent to the front of the reactor 20.
That is, the fluid passing through the reducing agent supply passage 810 can be used for decomposing urea by allowing a part of the exhaust gas passing through the reactor 20 to flow into the reactor or a part of the high-temperature exhaust gas in front of the reactor 20.
The detection side of the discharge temperature sensor 300 detects the temperature of the fluid discharged from the urea decomposition chamber 100 at least once.
That is, the discharge temperature sensor 300 can detect the temperature of the fluid mixed with the reducing agent discharged from the urea decomposition chamber 100.
The control unit 400 receives the temperature of the fluid discharged from the urea decomposition chamber 100 from the discharge temperature sensor 300 at least once. The control unit 400 has set a discharge temperature for discharging from the urea decomposition chamber 100. Therefore, the control unit 400 can control the urea injection amount injected into the urea decomposition chamber 100 by the urea injection nozzle 200 by comparing the discharge temperature detected by the discharge temperature sensor 300 with the preset discharge temperature.
That is, the control unit 400 can effectively prevent urea from being undecomposed in the urea decomposition chamber 100 by controlling the urea injection amount injected into the urea decomposition chamber 100 by the urea injection nozzle 200 based on the discharge temperature detected by the discharge temperature sensor 300 and by comparing the discharge temperature with the preset discharge temperature.
Therefore, the reducing agent supply system 101 can effectively prevent the clogging phenomenon of the reducing agent supply system 101 due to the by-product generated without decomposing urea inside the urea decomposition chamber 100.
The control unit 400 according to another embodiment of the present invention may control the urea injection amount of the urea injection nozzle 200 by comparing the discharge temperature detected by the discharge temperature sensor 300 with the first reference temperature and the second reference temperature.
When the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature, the control unit 400 decreases the urea injection amount injected into the urea decomposition chamber 100 by the urea injection nozzle 200.
Specifically, the initial urea injection amount injected by the urea injection nozzle 200 is a value calculated by the control unit 400 based on the set data based on the current load of the power generation device or the environmental information in which the power generation device is located. The first reference temperature is information that has been set in the control unit 400 according to the load of the power generation device.
That is, when the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature, the control unit 400 may control the urea injection nozzle 200 to inject urea in an amount smaller than the initially calculated urea injection amount into the urea decomposition chamber 100.
Specifically, when the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature, the control unit 400 may determine that, when the urea injection nozzle 200 injects urea into the urea decomposition chamber 100 in the calculated urea injection amount, it is difficult for all of the injected urea to be thermally decomposed, and the urea injection amount injected by the urea injection nozzle 200 may be reduced.
For example, when urea injection nozzle 200 injects a reduced urea injection amount into urea decomposition chamber 100, control portion 400 may intermittently perform urea injection from urea injection nozzle 200 or continuously inject urea in a reduced urea injection amount. Note that, similarly, the control unit 400 may control the urea injection nozzle 200 based on the information stored in the control unit 400, as for the amount of decrease in the urea injection amount.
Alternatively, when the discharge temperature detected by the discharge temperature sensor 300 is equal to or higher than the first reference temperature, the control unit 400 may control the urea injection amount calculated by the urea injection nozzle 200 to be injected into the urea decomposition chamber 100.
After the urea injection amount is decreased, the discharge temperature sensor 300 may detect the discharge temperature of the fluid discharged from the urea decomposition chamber 100 again. Then, the control unit 400 determines whether or not the discharge temperature re-detected by the discharge temperature sensor 300 is lower than a second reference temperature lower than the first reference temperature.
When the discharge temperature re-detected by the discharge temperature sensor 300 is lower than the second reference temperature lower than the first reference temperature, the control portion 400 may stop the urea injection from the urea injection nozzle 200.
The second reference temperature is information that has been set in the control section 400, like the first reference temperature, and has a temperature value lower than the first reference temperature.
Specifically, if the control unit 400 controls the urea injection nozzle 200 to decrease the urea injection amount, the fluid having heat flowing into the urea decomposition chamber 100 consumes relatively less heat energy when decomposing urea into a reducing agent, and thus the temperature of the fluid discharged from the urea decomposition chamber 100 can be relatively increased.
However, when the discharge temperature re-detected by the discharge temperature sensor 300 is lower than the second reference temperature lower than the first reference temperature, the control unit 400 may determine that it is difficult to thermally decompose the urea injection amount in the urea decomposition chamber 100 even if the urea injection amount is reduced. That is, when the discharge temperature re-detected by the discharge temperature sensor 300 is lower than the second reference temperature lower than the first reference temperature, the control portion 400 may control the urea injection nozzle 200 to stop the urea injection into the urea decomposition chamber 100.
Therefore, in the reducing agent supply system 101, when the injected urea cannot be thermally decomposed into the reducing agent in the urea decomposition chamber 100 even if the urea injection amount is reduced, the control unit 400 stops the urea injection from the urea injection nozzle 200, and the generation of by-products due to the non-decomposition of urea in the urea decomposition chamber 100 can be prevented.
Alternatively, when the discharge temperature re-detected by the discharge temperature sensor 300 is equal to or higher than the second reference temperature, the discharge temperature sensor 300 may re-detect the discharge temperature of the fluid discharged from the urea decomposition chamber 100 and compare the discharge temperature with the first reference temperature.
In addition, the reducing agent supply system 101 of another embodiment of the present invention may further include a heat regulating portion 500.
The heat quantity adjusting part 500 may be provided in front of the urea decomposition chamber 100 to adjust the flow rate or temperature of the fluid flowing into the urea decomposition chamber 100. Specifically, the heat quantity adjusting part 500 may adjust the heat quantity (thermal energy) of the fluid flowing into the urea decomposition chamber 100. For example, the heat regulating part 500 may include a heater 520 and a blower 510.
Further, the heat quantity adjusting part 500 may be controlled by the control part 400. For example, the control part 400 may control the heat of the fluid flowing into the urea decomposition chamber 100 by adjusting the actions of the heater 520 and the blower 510.
When the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature, the control unit 400 may control the heat quantity adjusting unit 500 to adjust the heat quantity of the fluid flowing into the urea decomposition chamber 100. That is, when the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature, the control unit 400 determines that, when the urea injection nozzle 200 injects urea in the calculated urea injection amount, it is difficult to thermally decompose all of the urea by the heat of the fluid flowing into the urea decomposition chamber 100.
At this time, the control part 400 may adjust the flow rate or temperature of the fluid flowing into the urea decomposition chamber 100. That is, the control part 400 may control the heater 520 or the blower 510 to increase or decrease the heat of the fluid flowing into the urea decomposition chamber 100 to thermally decompose the injected urea.
Alternatively, the control unit 400 may cause the urea injection nozzle 200 to inject urea in the calculated urea injection amount when the discharge temperature detected by the discharge temperature sensor 300 is lower than the first reference temperature.
After controlling the heat quantity adjusting unit 500, the discharge temperature sensor 300 may detect the discharge temperature of the fluid discharged from the urea decomposition chamber 100. At this time, the control portion 400 may stop the urea injection from the urea injection nozzle 200 when the discharge temperature detected by the discharge temperature sensor 300 is lower than a second reference temperature lower than the first reference temperature.
Alternatively, when the discharge temperature re-detected by the discharge temperature sensor 300 is equal to or higher than the second reference temperature, the control unit 400 may re-detect the discharge temperature of the fluid discharged from the urea decomposition chamber 100 by the discharge temperature sensor 300 and compare the detected discharge temperature with the first reference temperature.
In addition, the reducing agent supply system 101 of another embodiment of the present invention may further include an inflow temperature sensor 600.
The inflow temperature sensor 600 may detect the temperature of the fluid flowing into the urea decomposition chamber 100. Specifically, the inflow temperature sensor 600 may be provided at the inflow port of the urea decomposition chamber 100 or the reducing agent supply passage 810 adjacent to the inflow port of the urea decomposition chamber 100.
The control unit 400 may control the heat quantity adjusting unit 500 to increase the flow rate of the fluid flowing into the urea decomposition chamber 100 when the inflow temperature detected by the inflow temperature sensor 600 exceeds the set inflow temperature before the discharge temperature sensor 300 detects the discharge temperature again.
Specifically, after controlling the heat quantity adjuster 500, the controller 400 may control the heat quantity adjuster 500 to increase the flow rate of the fluid to the urea decomposition chamber 100 when the inflow temperature detected by the inflow temperature sensor 600 exceeds the preset inflow temperature.
The inflow temperature of the fluid flowing into the urea decomposition chamber 100 is set in the control unit 400. The control part 400 detects the temperature of the fluid flowing into the urea decomposition chamber 100 after controlling the heater 520 and the blower 510 of the heat quantity adjusting part 500, and may further increase the rotation speed of the blower 510 to increase the flow rate of the fluid flowing into the urea decomposition chamber 100 when the detected inflow temperature exceeds the set inflow temperature. At this time, the operation of the heater 520 may be maintained.
Therefore, when the inflow temperature detected by the inflow temperature sensor 600 exceeds the preset inflow temperature, the control unit 400 may determine that the current temperature of the fluid is maintained in consideration of the operation performance of the heater 520, and may thermally decompose the urea injected into the urea decomposition chamber 100 by increasing the flow rate.
That is, in the case where the inflow temperature detected by the inflow temperature sensor 600 exceeds the set inflow temperature, the control part 400 may increase the rotation speed of the blower 510 to increase the heat amount of the fluid flowing into the urea decomposition chamber 100. Therefore, the control portion 400 of the reducing agent supply system 101 can prevent excessive load or combustion of the heater 520 and effectively increase the heat amount of the fluid flowing into the urea decomposition chamber 100.
Alternatively, when the inflow temperature detected by the inflow temperature sensor 600 is lower than the preset inflow temperature, the control unit 400 may compare the discharge temperature re-detected by the discharge temperature sensor 300 with the second reference temperature.
In addition, the reducing agent supply system 101 of the further embodiment of the present invention may further include an inflow flow sensor 700.
The inflow flow rate sensor 700 may detect the flow rate of the fluid flowing into the urea decomposition chamber 100. Specifically, the inflow flow rate sensor 700 may be provided at the inlet of the urea decomposition chamber 100 or at the reducing agent supply passage 810 adjacent to the inlet of the urea decomposition chamber 100. Specifically, the reducing agent supply passage 810 may be provided with a heat amount adjusting portion 500, an inflow temperature sensor 600, an inflow flow rate sensor 700, a urea decomposition chamber 100, and a discharge temperature sensor 300.
That is, the inflow flow rate sensor 700 may detect the flow rate of the fluid having heat flowing into the urea decomposition chamber 100.
After controlling the heat quantity adjusting part 500 to increase the flow quantity of the fluid controlling the urea decomposition chamber 100, the control part 400 may compare the inflow flow quantity detected by the inflow flow quantity sensor 700 with the set inflow flow quantity. In addition, the control unit 400 is set to limit the inflow rate of the urea decomposition chamber 100 when controlling the blower 510. That is, if the rotation speed of blower 510 is too high, the injected urea cannot be thermally decomposed efficiently while passing through the inside of urea decomposition chamber 100.
When the inflow rate detected by the inflow rate sensor 700 exceeds the set inflow rate of the fluid, the control portion 400 may stop the urea injection into the urea decomposition chamber 100 through the urea injection nozzle 200.
Specifically, when the inflow rate detected by the inflow rate sensor 700 exceeds the set inflow rate of the fluid, the control unit 400 may determine that the urea injected into the urea decomposition chamber 100 cannot be thermally decomposed efficiently because the flow velocity of the fluid flowing into the urea decomposition chamber 100 is high, and may stop the urea injection from the urea injection nozzle 200.
Alternatively, when the inflow rate of the fluid detected by the inflow rate sensor 700 is equal to or less than the set inflow rate of the fluid, the control unit 400 may compare the discharge temperature re-detected by the discharge temperature sensor 300 with the second reference temperature.
A control process of the reducing agent supply system according to the first embodiment of the invention will be described with reference to fig. 1 and 2. Hereinafter, the reducing agent supply system mentioned in the control process of the reducing agent supply system of the first embodiment may be the same as the structure of the reducing agent supply system 101 of fig. 1 described above.
The urea injection amount is determined (S100). The urea injection amount is determined by the control unit 400 by mapping (mapping) based on the stored data according to the load of the power generation device and the environmental condition in which the power generation device is located.
The amount of heat required to thermally decompose the determined urea is calculated (S110). That is, the heat amount of the fluid required to thermally decompose the determined urea injection amount into the reducing agent is calculated.
A fluid having heat (thermal energy) is supplied to the urea decomposition chamber (S120). I.e. the fluid with the calculated heat is supplied to the urea decomposition chamber.
The temperature or inflow flow rate of the inflow fluid flowing into the urea decomposition chamber is detected (S130).
It is determined whether the detected temperature or inflow flow rate of the inflow fluid is the same as a target value (S140). In the case where the detected temperature or inflow flow rate of the inflow fluid is different from the target value, the fluid is supplied to the urea decomposition chamber to have heat (thermal energy) (S120).
Alternatively, when the detected temperature or inflow flow rate of the inflow fluid is equal to the target value, Urea (Urea) is injected into the Urea decomposition chamber by the Urea injection nozzle (S150).
It is determined whether an injection stop command for the urea injection nozzle to inject from the urea injection nozzle is input (S200). That is, it is determined whether or not a urea injection stop command from the urea injection nozzle has been input.
When a urea injection stopping command for the urea injection nozzle is input, urea injection from the urea injection nozzle to the urea decomposition chamber is stopped (S300). After that, the reducing agent supply system is ended.
Alternatively, when the urea injection stop command from the urea injection nozzle is not input, the temperature of the fluid discharged from the urea decomposition chamber is detected (S400). Specifically, the discharge temperature sensor detects the discharge temperature of the fluid discharged from the urea decomposition chamber.
The control unit compares the discharge temperature set in the control unit with the discharge temperature detected by the discharge temperature sensor (S500).
When the detected discharge temperature exceeds the set discharge temperature, the control unit determines that the injected urea is difficult to be thermally decomposed by the heat of the fluid flowing into the urea decomposition chamber, and stops urea injection from the urea injection nozzle (S300).
Alternatively, when the detected discharge temperature is equal to or lower than the set discharge temperature, the control unit determines whether or not a urea injection stop command is input (S200).
With this configuration, in the method of controlling the reducing agent supply system according to the first embodiment of the present invention, when the detected discharge temperature exceeds the set discharge temperature, the control unit may determine that the injected urea is difficult to be thermally decomposed by the heat of the fluid flowing into the urea decomposition chamber, and may stop the urea injection from the urea injection nozzle. Therefore, the control method of the reducing agent supply system can effectively prevent the generation of by-products inside the urea decomposition chamber due to the non-decomposition of urea.
In addition, it is possible to prevent the by-products thus produced from deteriorating the efficiency of purifying nitrogen oxides in the exhaust gas.
A control process of a reducing agent supply system according to a second embodiment of the present invention will be described with reference to fig. 1 and 3. Further, the reducing agent supply system mentioned in the control process of the reducing agent supply system of the second embodiment may be the same as the structure of the reducing agent supply system 101 of fig. 1 described above.
The urea injection amount is determined (S100). The urea injection amount is determined by the control unit 400 by mapping (mapping) based on the stored data according to the load of the power generation device and the environmental condition in which the power generation device is located.
The amount of heat required to thermally decompose the determined urea is calculated (S110). That is, the heat amount of the fluid required to thermally decompose the determined urea injection amount into the reducing agent is calculated.
A fluid having heat (thermal energy) is supplied to the urea decomposition chamber (S120). I.e. the fluid with the calculated heat is supplied to the urea decomposition chamber.
The temperature or inflow flow rate of the inflow fluid flowing into the urea decomposition chamber is detected (S130).
It is determined whether the detected temperature or inflow flow rate of the inflow fluid is the same as a target value (S140). In the case where the detected temperature or inflow flow rate of the inflow fluid is different from the target value, the fluid is supplied to the urea decomposition chamber to have heat (thermal energy) (S120).
Alternatively, when the detected temperature or inflow flow rate of the inflow fluid is equal to the target value, Urea (Urea) is injected into the Urea decomposition chamber by the Urea injection nozzle (S150).
It is determined whether an injection stop command for the urea injection nozzle to inject from the urea injection nozzle is input (S200). That is, it is determined whether or not a urea injection stop command from the urea injection nozzle has been input.
When a urea injection stopping command for the urea injection nozzle is input, urea injection from the urea injection nozzle to the urea decomposition chamber is stopped (S300). After that, the reducing agent supply system is ended.
Alternatively, when the urea injection stop command from the urea injection nozzle is not input, the temperature of the fluid discharged from the urea decomposition chamber is detected (S400). Specifically, the discharge temperature sensor detects the discharge temperature of the fluid discharged from the urea decomposition chamber.
The detected discharge temperature is compared with a first reference temperature (S600). Specifically, when the discharge temperature detected by the discharge temperature sensor is lower than the first reference temperature, the urea injection amount is adjusted (S610).
The control unit controls the urea injection nozzle to inject urea in an amount smaller than a first reference temperature when the discharge temperature detected by the discharge temperature sensor is lower than the first reference temperature.
Alternatively, when the discharge temperature detected by the discharge temperature sensor is equal to or higher than the first reference temperature, it is determined whether or not a urea injection stop command is input (S200).
When the urea injection amount injected by the urea injection nozzle is decreased, the discharge temperature of the fluid discharged from the urea decomposition chamber is detected again (S620). Specifically, when the urea injection amount injected by the urea injection nozzle decreases, the discharge temperature sensor detects the discharge temperature of the fluid discharged from the urea decomposition chamber.
The re-detected discharge temperature is compared with a second reference temperature (S700). At this time, the first reference temperature and the second reference temperature are temperature information values set in the control portion, and the second reference temperature has a relatively lower temperature than the first reference temperature.
If the re-detected discharge temperature is lower than the second reference temperature, urea injection from the urea injection nozzle is stopped (S300). Specifically, the control unit stops urea injection from the urea injection nozzle to the urea decomposition chamber. After that, the reducing agent supply system is ended.
That is, when the re-detected discharge temperature is lower than the second reference temperature, the control unit may determine that it is difficult to completely thermally decompose the fluid currently passing through the urea decomposition chamber by the heat of the fluid even with the reduced urea injection amount, and may stop the urea injection from the urea injection nozzle.
Alternatively, the control unit may detect the temperature of the fluid discharged from the urea decomposition chamber again when the re-detected discharge temperature is equal to or higher than the second reference temperature. The re-detected discharge temperature is compared with a first reference temperature (S600).
With this configuration, the control method of the reducing agent supply system of the second embodiment of the invention includes the first reference temperature and the second reference temperature that is lower than the first reference temperature. Therefore, after the urea injection amount is once reduced, the control portion can determine whether the reduced urea injection amount can be thermally decomposed. Further, the control unit may stop the urea injection from the urea injection nozzle to prevent the generation of by-products due to non-decomposition of urea in the urea decomposition chamber when it is determined that the urea injection amount is reduced and the urea is hardly thermally decomposed by the reducing agent decomposition chamber.
A control process of a reducing agent supply system according to a third embodiment of the present invention will be described with reference to fig. 1 and 4. Hereinafter, the reducing agent supply system mentioned in the control process of the reducing agent supply system of the third embodiment may be the same as the structure of the reducing agent supply system 101 of fig. 1 described above.
The urea injection amount is determined (S100). The urea injection amount is determined by the control unit 400 by mapping (mapping) based on the stored data according to the load of the power generation device and the environmental condition in which the power generation device is located.
The amount of heat required to thermally decompose the determined urea is calculated (S110). That is, the heat amount of the fluid required to thermally decompose the determined urea injection amount into the reducing agent is calculated.
A fluid having heat (thermal energy) is supplied to the urea decomposition chamber (S120). I.e. the fluid with the calculated heat is supplied to the urea decomposition chamber.
The temperature or inflow flow rate of the inflow fluid flowing into the urea decomposition chamber is detected (S130).
It is determined whether the detected temperature or inflow flow rate of the inflow fluid is the same as a target value (S140). In the case where the detected temperature or inflow flow rate of the inflow fluid is different from the target value, the fluid is supplied to the urea decomposition chamber to have heat (thermal energy) (S120).
Alternatively, when the detected temperature or inflow flow rate of the inflow fluid is equal to the target value, Urea (Urea) is injected into the Urea decomposition chamber by the Urea injection nozzle (S150).
It is determined whether an injection stop command for the urea injection nozzle to inject from the urea injection nozzle is input (S200). That is, it is determined whether or not a urea injection stop command from the urea injection nozzle has been input.
When a urea injection stopping command for the urea injection nozzle is input, urea injection from the urea injection nozzle to the urea decomposition chamber is stopped (S300). After that, the reducing agent supply system is ended.
Alternatively, when the urea injection stop command from the urea injection nozzle is not input, the temperature of the fluid discharged from the urea decomposition chamber is detected (S400). Specifically, the discharge temperature sensor detects the discharge temperature of the fluid discharged from the urea decomposition chamber.
The detected discharge temperature is compared with a first reference temperature (S600). Specifically, when the discharge temperature detected by the discharge temperature sensor is lower than the first reference temperature, the amount of heat of the fluid flowing into the urea decomposition chamber is adjusted (S630). In this case, the control unit may adjust the heater and the blower included in the heat amount adjustment unit to increase the amount of heat of the fluid flowing into the urea decomposition chamber.
Alternatively, when the discharge temperature detected by the discharge temperature sensor is equal to or higher than the first reference temperature, it is determined whether or not a urea injection stop command is input (S200).
After adjusting to increase the amount of heat, the inflow temperature of the fluid flowing into the urea decomposition chamber is detected (S640).
Further, the detected inflow temperature of the fluid and the set inflow temperature are compared (S650). Specifically, the inflow temperature sensor detects the temperature of the fluid flowing into the urea decomposition chamber. The control unit has set an inflow temperature of the fluid flowing into the urea decomposition chamber.
When the detected inflow temperature exceeds the set inflow temperature, the control unit maintains the current temperature of the heater and increases the speed of the blower to increase only the flow rate of the fluid flowing into the urea decomposition chamber (S800).
That is, when the detected inflow temperature exceeds the set inflow temperature, the control unit determines that the urea injected into the urea decomposition chamber can be decomposed at the current temperature, maintains the heated temperature at the current temperature, and increases the heat amount of the fluid flowing into the urea decomposition chamber by increasing only the speed of the blower.
Alternatively, when the detected inflow temperature is equal to or lower than the preset inflow temperature, the control unit detects the temperature of the fluid discharged from the urea decomposition chamber again (S620). Specifically, the discharge temperature sensor detects the temperature of the fluid discharged from the urea decomposition chamber.
The re-detected discharge temperature is compared with a second reference temperature (S700). At this time, the first reference temperature and the second reference temperature are temperature information values set in the control portion, and the second reference temperature has a relatively lower temperature than the first reference temperature.
When the re-detected discharge temperature is lower than the second reference temperature, the control unit stops urea injection (S300). Specifically, when the re-detected discharge temperature is lower than the second reference temperature, the control unit determines that the urea injected into the urea decomposition chamber cannot be thermally decomposed, and stops the urea injection from the urea injection nozzle of the urea decomposition chamber.
When the re-detected discharge temperature is equal to or higher than the second reference temperature, the discharge temperature sensor re-detects the discharge temperature of the fluid discharged from the urea decomposition chamber (S400). The control unit compares the re-detected discharge temperature of the fluid with a first reference temperature (S600).
Further, in the case where only the flow rate of the fluid flowing into the urea decomposition chamber is increased, the inflow flow rate of the fluid flowing into the urea decomposition chamber is detected (S810). Specifically, the inflow flow rate sensor detects an inflow flow rate of the fluid flowing into the urea decomposition chamber.
Further, the detected inflow rate and the set inflow rate are compared (S820). The control unit has set inflow flow rate information.
For example, the inflow rate information set in the control unit may be a value that takes into account the flow velocity of the fluid passing through the urea decomposition chamber and the thermal decomposition reaction of the injected urea. That is, when the fluid passes through the urea decomposition chamber at an excessively high flow rate, the process of thermal decomposition by contact between the injected urea and the fluid does not proceed smoothly in the urea decomposition chamber, and there is a possibility that by-products are generated without decomposition.
If the detected inflow rate exceeds the set inflow rate, urea injection is suspended (S300). Specifically, the control unit controls the urea injection nozzle to stop urea injection into the urea decomposition chamber when the detected inflow rate exceeds the set inflow rate.
When the detected inflow rate is equal to or less than the set inflow rate, the discharge temperature of the fluid discharged from the urea decomposition chamber is detected again (S620). The re-detected discharge temperature is compared with a second reference temperature (S700).
With this configuration, the control method of the reducing agent supply system according to the third embodiment of the invention can efficiently thermally decompose the injected urea by increasing the heat of the fluid flowing in when it is difficult to thermally decompose the injected urea with the heat of the fluid flowing in the inside of the urea decomposition chamber.
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, it will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the invention.
Therefore, the above-described embodiments should be construed as illustrative in all aspects and not restrictive, the scope of the invention being indicated by the appended claims, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Possibility of industrial application
The reducing agent supply system and the control method thereof of the embodiment of the invention can be utilized for a reducing agent supply system for reducing nitrogen oxides included in exhaust gas and a control method thereof.
Description of the symbols
100: urea decomposition chamber, 101: reducing agent supply system, 200: urea injection nozzle, 300: discharge temperature sensor, 400: control unit, 500: heat regulating portion, 600: inflow temperature sensor, 700: flows into the flow sensor.
Claims (8)
1. A reductant supply system, comprising:
a urea decomposition chamber into which a fluid flows;
a urea injection nozzle that injects urea into the urea decomposition chamber;
a discharge temperature sensor that detects a temperature of the fluid discharged from the urea decomposition chamber; and
a control unit that controls an amount of urea injected into the urea decomposition chamber through the urea injection nozzle by comparing a discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature,
the control unit reduces the urea injection amount of the urea injection nozzle when the discharge temperature detected by the discharge temperature sensor is lower than a first reference temperature,
the control unit stops the urea injection from the urea injection nozzle when the discharge temperature re-detected by the discharge temperature sensor is lower than a second reference temperature lower than the first reference temperature after the urea injection amount is decreased.
2. A reductant supply system, comprising:
a urea decomposition chamber into which a fluid flows;
a urea injection nozzle that injects urea into the urea decomposition chamber;
a discharge temperature sensor that detects a temperature of the fluid discharged from the urea decomposition chamber;
a control unit that controls an amount of urea injected into the urea decomposition chamber through the urea injection nozzle by comparing a discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature; and
a heat regulating portion that regulates a flow rate or a temperature of the fluid flowing into the urea decomposition chamber,
the control unit controls the heat quantity adjusting unit to adjust the quantity of heat of the fluid flowing into the urea decomposition chamber when the discharge temperature detected by the discharge temperature sensor is lower than a first reference temperature,
the control unit stops urea injection from the urea injection nozzle when the discharge temperature detected again by the discharge temperature sensor is lower than a second reference temperature lower than the first reference temperature.
3. The reducing agent supply system according to claim 2,
further comprising an inflow temperature sensor that detects a temperature of the fluid flowing into the urea decomposition chamber,
the control unit controls the heat quantity adjusting unit to increase the flow rate of the fluid to the urea decomposition chamber when the inflow temperature detected by the inflow temperature sensor exceeds a preset inflow temperature after controlling the heat quantity adjusting unit,
when the inflow temperature detected by the inflow temperature sensor is equal to or lower than the set inflow temperature, the control unit compares the discharge temperature re-detected by the discharge temperature sensor with the second reference temperature.
4. The reducing agent supply system according to claim 3,
further comprising an inflow flow rate sensor that detects a flow rate of the fluid flowing into the urea decomposition chamber,
the control unit stops urea injection from the urea injection nozzle when an inflow rate of the fluid detected by the inflow rate sensor exceeds a preset inflow rate of the fluid after controlling the heat quantity adjusting unit to increase the flow rate of the fluid into the urea decomposition chamber,
when the inflow rate of the fluid detected by the inflow rate sensor is equal to or less than the set inflow rate of the fluid, the control unit compares the discharge temperature re-detected by the discharge temperature sensor with the second reference temperature.
5. A control method of a reducing agent supply system, characterized by comprising:
determining an amount of urea injected;
calculating an amount of heat required to decompose the determined urea injection amount;
a step of supplying the calculated thermal fluid to a urea decomposition chamber;
injecting urea into the urea decomposition chamber;
detecting a discharge temperature of the fluid discharged from the urea decomposition chamber;
comparing the detected discharge temperature with a first reference temperature;
reducing an amount of urea injected into the urea decomposition chamber when the detected discharge temperature is lower than the first reference temperature;
detecting a discharge temperature of the fluid discharged from the urea decomposition chamber after reducing the urea injection amount;
comparing the re-detected discharge temperature with a second reference temperature lower than the first reference temperature; and
and stopping urea injection into the urea decomposition chamber when the re-detected discharge temperature is lower than a second reference temperature.
6. A control method of a reducing agent supply system, characterized by comprising:
determining an amount of urea injected;
calculating an amount of heat required to decompose the determined urea injection amount;
a step of supplying the calculated thermal fluid to a urea decomposition chamber;
injecting urea into the urea decomposition chamber;
detecting a discharge temperature of the fluid discharged from the urea decomposition chamber;
comparing the detected discharge temperature with a first reference temperature;
adjusting the amount of heat of the fluid supplied to the urea decomposition chamber when the detected discharge temperature is lower than the first reference temperature;
adjusting the heat quantity of the fluid, and then detecting the discharge temperature of the fluid discharged from the urea decomposition chamber; and
and stopping urea injection into the urea decomposition chamber when the re-detected discharge temperature is lower than a second reference temperature lower than the first reference temperature.
7. The control method of a reducing agent supply system according to claim 6,
before the discharge temperature of the fluid discharged from the urea decomposition chamber is detected again, the method further includes:
a step of detecting an inflow temperature of the fluid flowing into the urea decomposition chamber;
comparing the detected inflow temperature with a set inflow temperature; and
and increasing a flow rate of the fluid flowing into the urea decomposition chamber when the detected inflow temperature exceeds the set inflow temperature.
8. The control method of a reducing agent supply system according to claim 7,
after increasing the flow of fluid into the urea decomposition chamber, the method further comprises:
detecting an inflow rate of a fluid flowing into the urea decomposition chamber;
comparing the detected inflow rate with a set inflow rate; and
and stopping urea injection into the urea decomposition chamber when the detected inflow flow rate exceeds the set inflow flow rate.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150188251A KR102042876B1 (en) | 2015-12-29 | 2015-12-29 | Reducing agent supplying system and method for controlling thereof |
| KR10-2015-0188251 | 2015-12-29 | ||
| PCT/KR2016/014938 WO2017116060A1 (en) | 2015-12-29 | 2016-12-20 | System for supplying reducing agent and control method therefor |
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| CN108474281A CN108474281A (en) | 2018-08-31 |
| CN108474281B true CN108474281B (en) | 2021-03-12 |
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| JP (1) | JP6863992B2 (en) |
| KR (1) | KR102042876B1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013209885A (en) * | 2012-03-30 | 2013-10-10 | Hino Motors Ltd | Exhaust emission control device |
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| US6508242B2 (en) * | 2001-01-31 | 2003-01-21 | Cummins, Inc. | System for estimating engine exhaust temperature |
| JP2009228448A (en) * | 2008-03-19 | 2009-10-08 | Mazda Motor Corp | Supercharging device of engine |
| KR101010456B1 (en) * | 2009-01-09 | 2011-01-21 | 콘티넨탈 오토모티브 시스템 주식회사 | Method for preventing catalyst overheating |
| US8844269B2 (en) * | 2012-03-16 | 2014-09-30 | Cummins Inc. | Aftertreatment system and method for pre-decomposed reductant solution |
| KR101445038B1 (en) * | 2013-06-28 | 2014-09-26 | 두산엔진주식회사 | System for selective catalytic reuction and catalytic regeneration |
| CN103437868A (en) * | 2013-08-30 | 2013-12-11 | 东风商用车有限公司 | Ammonia gas preparation and quantitative injection system for SCR reaction |
| KR101497828B1 (en) | 2013-09-30 | 2015-03-02 | 두산엔진주식회사 | System for selective catalytic reuction and method for selective catalytic reuction |
| KR101509951B1 (en) | 2013-10-24 | 2015-04-07 | 현대자동차주식회사 | System for operating temperature alteration preventiom of scr catalyst |
| US9243534B2 (en) * | 2013-10-24 | 2016-01-26 | General Electric Company | Gaseous reductant injection control system |
| CN104047689A (en) * | 2014-07-15 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Post-processing system with urea hydrolysis function |
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| JP2013209885A (en) * | 2012-03-30 | 2013-10-10 | Hino Motors Ltd | Exhaust emission control device |
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| KR20170078091A (en) | 2017-07-07 |
| KR102042876B1 (en) | 2019-11-13 |
| WO2017116060A1 (en) | 2017-07-06 |
| JP6863992B2 (en) | 2021-04-21 |
| CN108474281A (en) | 2018-08-31 |
| JP2019506557A (en) | 2019-03-07 |
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