KR102042876B1 - Reducing agent supplying system and method for controlling thereof - Google Patents

Abstract

Embodiment of the present invention relates to a reducing agent supply system, the reducing agent supply system is a urea decomposition chamber into which fluid is introduced, a urea injection nozzle for injecting urea into the urea decomposition chamber, and the fluid discharged from the urea decomposition chamber A discharge temperature sensor for detecting a temperature, and a control unit for controlling the amount of urea injection injected into the urea decomposition chamber through the urea injection nozzle by comparing the discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature. Include.

Description

REDUCING AGENT SUPPLYING SYSTEM AND METHOD FOR CONTROLLING THEREOF}

Embodiment of the present invention relates to a reducing agent supply system, and more particularly to a reducing agent supply system and a control method for reducing the nitrogen oxide contained in the exhaust gas.

In general, power generators that produce power by burning fuel emit exhaust gases. Such exhaust gases include nitrogen oxides. If nitrogen oxides are discharged to the outside without further treatment for purification or abatement, they have a detrimental effect on humans and the environment.

Therefore, urea is supplied to reduce the nitrogen oxide contained in the exhaust gas discharged by the power generator to be discharged to the outside. Urea is pyrolyzed by the amount of heat in the exhaust gas to produce a reducing agent.

However, such urea generates by-products (Deposit) when the heat amount of the exhaust gas is low, the resulting by-products have problems such as clogging of the injection nozzle or obstruction of supply of a reducing agent through the injection pipe.

In addition, when the injected urea is not decomposed to produce an appropriate reducing agent, the reducing agent supplying system effectively reduces nitrogen oxides and is difficult to discharge to the outside.

An embodiment of the present invention provides a reducing agent supply system and a control method thereof capable of effectively decomposing urea.

According to embodiments of the present invention, the reducing agent supply system for detecting the temperature of the fluid discharged from the urea decomposition chamber, the urea injection nozzle for injecting urea inside the urea decomposition chamber, and the fluid discharged from the urea decomposition chamber A discharge temperature sensor, and a control unit for controlling the amount of urea injection injected into the urea decomposition chamber through the urea injection nozzle by comparing the discharge temperature detected at least once by the discharge temperature sensor with a predetermined discharge temperature.

The control unit may reduce the amount of urea injection of the urea injection nozzle when the discharge temperature detected by the discharge temperature sensor is less than a first reference temperature, and discharge the rediscovered by the discharge temperature sensor after the urea injection amount is reduced. When the temperature is lower than the second reference temperature lower than the first reference temperature, the urea injection of the urea injection nozzle may be stopped.

Alternatively, the above-described reducing agent supply system further includes a calorific control unit for adjusting the flow rate or temperature of the fluid flowing into the urea decomposition chamber, wherein the control unit is the discharge temperature detected by the discharge temperature sensor is less than a first reference temperature The calorific control unit controls the calorific value of the fluid flowing into the urea decomposition chamber, and when the discharge temperature redetected by the discharge temperature sensor is less than the second reference temperature lower than the first reference temperature, Urea injection can be stopped.

In addition, the above-described reducing agent supply system further comprises an inlet temperature sensor for detecting the temperature of the fluid flowing into the urea decomposition chamber, the control unit controls the calorific control unit after the inlet temperature detected by the inlet temperature sensor The calorific control unit is controlled to increase the flow rate of the fluid to the urea decomposition chamber when the set inlet temperature is exceeded, and redetected by the discharge temperature sensor when the inlet temperature detected by the inlet temperature sensor is lower than or equal to a preset inlet temperature. The discharge temperature and the second reference temperature can be compared.

In addition, the reducing agent supply system further includes an inflow flow rate sensor for detecting the flow rate of the fluid flowing into the urea decomposition chamber, the control unit controls the calorific control unit to increase the flow rate of the fluid to the urea decomposition chamber When the inflow flow rate of the fluid detected by the inflow flow sensor exceeds the inflow flow rate of the predetermined fluid, the urea injection of the urea injection nozzle is stopped, and the inflow flow rate of the fluid detected by the inflow flow sensor is a preset fluid. When the inflow flow rate is equal to or less than, the discharge temperature redetected by the discharge temperature sensor may be compared with the second reference temperature.

Alternatively, the control method of the reducing agent supply system according to an embodiment of the present invention comprises the steps of determining the amount of urea injection, calculating the amount of heat required to decompose the determined urea injection amount, and the fluid of the calculated heat amount urea decomposition chamber Supplying the urea, 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 the amount of urea injected into the urea decomposition chamber when the detected discharge temperature is less than the first reference temperature, and re-detecting the discharge temperature of the fluid discharged from the urea decomposition chamber after reducing the amount of urea injection And a second reference temperature lower than the redetected discharge temperature and the first reference temperature. Gyoha step, and when the re-detected the discharge temperature is less than the second reference temperature and a step of stopping the injection of urea in the urea decomposition chamber.

Alternatively, the control method of the reducing agent supply system according to another embodiment of the present invention comprises the steps of determining the amount of urea injection, calculating the amount of heat required to decompose the determined urea injection amount, and the urea decomposition of the calculated amount of fluid Supplying a chamber, injecting urea into the urea decomposition chamber, detecting a discharge temperature of a fluid discharged from the urea decomposition chamber, and comparing the detected discharge temperature with a first reference temperature And adjusting the amount of heat of the fluid supplied to the urea decomposition chamber when the detected discharge temperature is less than the first reference temperature, and adjusting the amount of heat of the fluid discharged from the urea decomposition chamber after adjusting the amount of heat of the fluid. Re-detecting, and the redetected discharge temperature is less than the second reference temperature lower than the first reference temperature. If only stopping the urea injection into the urea decomposition chamber.

The above-described control method may further include detecting an inflow temperature of the fluid flowing into the urea decomposition chamber before redetecting a discharge temperature of the fluid discharged from the urea decomposition chamber, and detecting the detected inflow temperature and a preset inflow temperature. And comparing the flow rate and increasing the flow rate of the fluid flowing into the urea decomposition chamber when the detected inflow temperature exceeds the predetermined inflow temperature.

In addition, the control method described above may increase the flow rate of the fluid flowing into the urea decomposition chamber, and then detect the inflow flow rate of the fluid flowing into the urea decomposition chamber, and detect the detected inflow flow rate and the preset inflow flow rate. And comparing the urea injection to the urea decomposition chamber when the detected inflow flow rate exceeds the predetermined inflow flow rate.

According to embodiments of the present invention, the reducing agent supply system and its control method can effectively decompose urea and prevent the formation of by-products.

1 is a view showing a reducing agent supply system according to an embodiment of the present invention.
2 is a flowchart illustrating a control process of a controller according to the first embodiment of FIG. 1.
3 is a flowchart illustrating a control process of a controller according to the second embodiment of FIG. 1.
4 is a flowchart illustrating a control process of a controller according to the third embodiment of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

It is noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures have been exaggerated or reduced in size for clarity and convenience in the figures and any dimensions are merely exemplary and not limiting. And the same reference numerals are used to represent similar features in the same structural element or part shown in more than one figure.

Embodiments of the invention specifically illustrate ideal embodiments of the invention. As a result, various modifications of the drawings are expected. Thus, the embodiment is not limited to the specific form of the illustrated region, but includes, for example, modification of the form by manufacture.

Hereinafter, 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, the reducing agent supply system 101 includes a urea decomposition chamber 100, a urea injection nozzle 200, a discharge temperature sensor 300, and a controller 400.

Fluid is introduced into the urea decomposition chamber 100. Specifically, the urea decomposition chamber 100 may be formed hollow inside. In addition, the inlet of the fluid may be formed at one side of the urea decomposition chamber 100, and the outlet of the fluid may be formed at the other side of the urea decomposition chamber 100.

In addition, the fluid supplied to the urea decomposition chamber 100 has a calorific value (heat energy). For example, the fluid having a calorific value supplied to the urea decomposition chamber 100 may branch a part of the exhaust gas to enter 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 installed at one side of the urea decomposition chamber 100 to inject urea into the fluid passing through the urea decomposition chamber 100. The urea passes through the urea decomposition chamber 100 and may be thermally decomposed due to the heat amount of the fluid 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 installed in the discharge port of the urea decomposition chamber 100 or may be installed in the reducing agent supply flow path 810 adjacent to the discharge hole. The reducing agent supply passage 810 supplies a fluid having a calorific value to the urea decomposition chamber 100 to generate a reducing agent and to supply the selective catalytic reduction apparatus 50. Specifically, the selective catalytic reduction apparatus 50 includes a reactor 20 having a catalyst 21 installed therein and an exhaust passage 10 having the reactor 20 installed therein.

In detail, the reducing agent supply passage 810 is connected to the reducing agent injecting member 820 provided on the exhaust passage 10 in front of the reactor 20, and supplies the generated reducing agent to the reactor 20 in front of the reactor 20.

That is, the fluid passing through the reducing agent supply flow path 810 may be re-introduced a part of the exhaust gas passing through the reactor 20, or may be used to decompose urea by introducing a part of the high-temperature exhaust gas in front of the reactor 20. have.

In addition, 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 may detect the temperature of the fluid mixed with the reducing agent discharged from the urea decomposition chamber 100.

The controller 400 receives the temperature of the discharged fluid detected at least once from the urea decomposition chamber 100 by the discharge temperature sensor 300. In addition, the discharge temperature discharged from the urea decomposition chamber 100 is preset in the controller 400. Therefore, the controller 400 compares the discharge temperature detected by the discharge temperature sensor 300 with a preset discharge temperature to control the amount of urea injection that the urea injection nozzle 200 injects into the urea decomposition chamber 100.

That is, the controller 400 compares the amount of urea sprayed by the urea injection nozzle 200 into the urea decomposition chamber 100 based on the discharge temperature preset by the discharge temperature sensor 300. By controlling, it is possible to effectively prevent the urea from being decomposed inside the urea decomposition chamber 100.

Therefore, the reducing agent supply system 101 can effectively prevent the clogging phenomenon of the reducing agent supply system 101 due to by-products generated by undecomposed urea in the urea decomposition chamber 100.

In addition, the controller 400 according to another embodiment of the present invention compares the discharge temperature detected by the discharge temperature sensor 300 with the first reference temperature and the second reference temperature to determine the amount of urea injection of the urea injection nozzle 200. Can be controlled.

When the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the controller 400 reduces the amount of urea injection that the urea injection nozzle 200 sprays into the urea decomposition chamber 100.

Specifically, the urea injection amount injected through the initial urea injection nozzle 200 is calculated by the controller 400 on the basis of preset data according to the load of the current power generator or the environmental information in which the power generator is located. Value. In addition, the first reference temperature is information preset in the controller 400 according to the load of the power generator.

That is, when the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the control unit 400 sprays urea so that an amount of urea smaller than the initially calculated urea injection amount is injected into the urea decomposition chamber 100. The nozzle 200 may be controlled.

Specifically, when the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the control unit 400 uses the calculated urea injection amount to discharge the urea into the urea decomposition chamber 100. When spraying, it is determined that all of the sprayed urea is difficult to thermally decompose, thereby reducing the amount of urea sprayed by the urea spray nozzle 200.

For example, when the urea injection nozzle 200 is sprayed to the urea decomposition chamber 100 when the urea injection amount is reduced, the control unit 400 intermittently urea injection of the urea injection nozzle 200, or at a continuous reduced urea injection amount Can be sprayed. In addition, the amount of reduction of the urea injection amount may also be controlled by the control unit 400 based on the information stored in the control unit 400.

Alternatively, when the discharge temperature detected by the discharge temperature sensor 300 is equal to or greater than the first reference temperature, the controller 400 controls the urea injection amount calculated through the urea injection nozzle 200 to be injected into the urea decomposition chamber 100. can do.

In addition, after the urea injection amount is reduced, the discharge temperature sensor 300 may redetect the discharge temperature of the fluid discharged from the urea decomposition chamber 100. The controller 400 determines whether the discharge temperature redetected by the discharge temperature sensor 300 is less than the second reference temperature lower than the first reference temperature.

When the discharge temperature redetected by the discharge temperature sensor 300 is less than the second reference temperature lower than the first reference temperature, the controller 400 may stop urea injection of the urea injection nozzle 200.

The second reference temperature is the same information as the first reference temperature and is preset in the controller 400 and has a lower temperature than the first reference temperature.

Specifically, when the control unit 400 controls the urea injection nozzle 200 to reduce the amount of urea injection, the fluid having a heat amount introduced into the urea decomposition chamber 100 consumes relatively little heat energy to decompose urea as a reducing agent. The temperature of the fluid discharged from the urea decomposition chamber 100 may be relatively increased.

However, when the discharge temperature redetected by the discharge temperature sensor 300 is less than the second reference temperature lower than the first reference temperature, the controller 400 may thermally decompose the urea injection amount even if the amount of urea injection is reduced. You may find it difficult. That is, when the discharge temperature redetected by the discharge temperature sensor 300 is less than the second reference temperature lower than the first reference temperature, the control unit 400 sprays urea such that the urea injection injected into the urea decomposition chamber 100 is stopped. The nozzle 200 may be controlled.

Therefore, when the reducing agent supply system 101 does not thermally decompose the urea injected in the urea decomposition chamber 100 with the reducing agent even though the amount of urea injection is reduced, the control unit 400 performs urea injection of the urea injection nozzle 200. By stopping, it is possible to prevent the generation of by-products due to undecomposed urea inside the urea decomposition chamber 100.

Alternatively, when the discharge temperature redetected by the discharge temperature sensor 300 is equal to or greater than a second reference temperature, the discharge temperature sensor 300 redetects the discharge temperature of the fluid discharged from the urea decomposition chamber 100 to regenerate the first temperature. It can be compared with the reference temperature.

In addition, the reducing agent supply system 101 according to another embodiment of the present invention may further include a calorie control unit 500.

The calorific value control unit 500 may be installed 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 calorific value control unit 500 may adjust the calorific value (heat energy) of the fluid flowing into the urea decomposition chamber 100. For example, the calorific value control unit 500 may include a heater 520 and a blower 510.

In addition, the calorific value control unit 500 may be controlled by the control unit 400. For example, the controller 400 may control the heat amount of the fluid flowing into the urea decomposition chamber 100 by adjusting the operations of the heater 520 and the blower 510.

When the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the controller 400 may control the calorific value control unit 500 to adjust the calorific value of the fluid flowing into the urea decomposition chamber 100. have. That is, when the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the control unit 400, when the urea injection nozzle 200 injects urea with the calculated urea injection amount, to the urea decomposition chamber 100. It is judged that it is difficult to thermally decompose all of them by the amount of heat of the flowing fluid.

In this case, the controller 400 may adjust the flow rate or temperature of the fluid flowing into the urea decomposition chamber 100. That is, the controller 400 may control the heater 520 or the blower 510 to increase or decrease the amount of heat of the fluid flowing into the urea decomposition chamber 100 to thermally decompose the injected urea.

Alternatively, when the discharge temperature detected by the discharge temperature sensor 300 is less than the first reference temperature, the controller 400 may cause the urea injection nozzle 200 to inject the urea using the calculated urea injection amount.

In addition, after controlling the calorific value control unit 500, the discharge temperature sensor 300 may redetect the discharge temperature of the fluid discharged from the urea decomposition chamber 100. In this case, when the discharge temperature detected by the discharge temperature sensor 300 is less than the second reference temperature lower than the first reference temperature, the controller 400 may stop the urea injection of the urea injection nozzle 200.

Alternatively, when the discharge temperature redetected by the discharge temperature sensor 300 is equal to or greater than the second reference temperature, the controller 400 may determine the discharge temperature of the fluid discharged from the urea decomposition chamber 100 by the discharge temperature sensor 300. It can be redetected and compared with the first reference temperature.

In addition, the reducing agent supply system 101 according to another embodiment of the present invention may further include an inlet temperature sensor 600.

The inflow temperature sensor 600 may detect the temperature of the fluid flowing into the urea decomposition chamber 100. In detail, the inlet temperature sensor 600 may be installed in the reducing agent supply passage 810 adjacent to the inlet of the urea decomposition chamber 100 or the inlet of the urea decomposition chamber 100.

The controller 400 is introduced into the urea decomposition chamber 100 when the inlet temperature detected by the inlet temperature sensor 600 exceeds the preset inlet temperature before the outlet temperature sensor 300 redetects the outlet temperature. The calorific value control unit 500 may be controlled to increase the flow rate of the fluid.

Specifically, after the control unit 400 controls the calorific control unit 500, when the inlet temperature detected by the inlet temperature sensor 600 exceeds the preset inlet temperature, the flow rate of the fluid to the urea decomposition chamber 100 The calorific control unit 500 may be controlled to increase.

The controller 400 has a preset inlet temperature of the fluid flowing into the urea decomposition chamber 100. The controller 400 controls the heater 520 and the blower 510 of the calorific value control unit 500, and then detects the temperature of the fluid flowing into the urea decomposition chamber 100 to detect the inflow temperature of the preset inflow temperature. When exceeding, the rotational speed of the blower 510 may be further increased to increase the flow rate of the fluid flowing into the urea decomposition chamber 100. In this case, 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 controller 400 maintains the current fluid temperature in consideration of the operating performance of the heater 520 to increase the flow rate. It can be determined that only urea injected into the urea decomposition chamber 100 can be thermally decomposed.

That is, when the inflow temperature detected by the inflow temperature sensor 600 exceeds the preset inflow temperature, the controller 400 increases the rotational speed of the blower 510 to prevent the inflow of the fluid flowing into the urea decomposition chamber 100. You can increase your calories. Accordingly, the controller 400 of the reducing agent supply system 101 may prevent excessive load or combustion of the heater 520, and may effectively increase the amount of heat of the fluid flowing into the urea decomposition chamber 100.

or. When the inflow temperature detected by the inflow temperature sensor 600 is less than or equal to the preset inflow temperature, the controller 400 may compare the discharge temperature detected by the discharge temperature sensor 300 with the second reference temperature.

In addition, the reducing agent supply system 101 according to another embodiment of the present invention may further include an inflow flow rate 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 sensor 700 may be installed in the reducing agent supply passage 810 adjacent to the inlet of the urea decomposition chamber 100 or the inlet of the urea decomposition chamber 100. Specifically, on the reducing agent supply passage 810, the calorific value control unit 500, the inlet temperature sensor 600, the inlet flow rate sensor 700, the urea decomposition chamber 100 and the discharge temperature sensor 300 may be installed.

That is, the inflow flow rate sensor 700 may detect the flow rate of the fluid having the amount of heat flowing into the urea decomposition chamber 100.

After controlling the calorific value control unit 500 to increase the flow rate of the fluid of the urea decomposition chamber 100, the controller 400 may compare the inflow flow rate detected by the inflow flow sensor 700 and the preset inflow flow rate. In addition, the control unit 400 has a preset inflow flow rate to be limited to supply to the urea decomposition chamber 100 when the blower 510 is controlled. That is, if the rotation speed of the blower 510 is too fast, the urea injected while passing through the urea decomposition chamber 100 cannot be thermally decomposed effectively.

When the inflow flow rate detected by the inflow flow sensor 700 exceeds the inflow flow rate of the predetermined fluid, the control unit 400 performs urea injection injected into the urea decomposition chamber 100 through the urea injection nozzle 200. You can stop it.

Specifically, when the inflow flow rate detected by the inflow flow sensor 700 exceeds the inflow flow rate of the predetermined fluid, the controller 400 has a high flow rate of the fluid flowing into the urea decomposition chamber 100 so that the urea decomposition chamber ( 100) by determining that the urea injected therein cannot be effectively pyrolyzed, urea injection of the urea injection nozzle 200 may be stopped.

Alternatively, when the inflow flow rate of the fluid detected by the inflow flow sensor 700 is less than or equal to the preset inflow flow rate of the fluid, the control unit 400 may re-detect the discharge temperature and the second reference temperature by the discharge temperature sensor 300. Can be compared.

Hereinafter, a control process of a reducing agent supply system according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2. Hereinafter, the reducing agent supply system mentioned in the control process of the reducing agent supply system according to the first embodiment may be the same as the configuration of the reducing agent supply system 101 of FIG.

Determine the amount of urea injection (S100). The urea injection amount is determined by mapping the control unit 400 based on the stored data according to the load of the power generator and the environmental conditions in which the power generator is located.

The amount of heat required to pyrolyze the determined urea is calculated (S110). That is, the amount of heat of the fluid required to pyrolyze the determined amount of urea injection into the reducing agent is calculated.

The fluid having a calorific value (thermal energy) is supplied to the urea decomposition chamber (S120). That is, the fluid having the calculated calorific value 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 inflow fluid temperature or inflow flow rate is the same as the target value (S140). If 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 a calorific value (thermal energy) (S120).

Alternatively, when the detected inflow fluid temperature or inflow flow rate is the same as the target value, the urea injection nozzle injects urea (Urea) into the urea decomposition chamber (S150).

It is determined whether an injection stop command of the urea injection nozzle injected from the urea injection nozzle is input (S200). That is, it is determined whether the urea injection stop command of the urea injection nozzle has been previously input.

When the urea injection stop command of the urea injection nozzle is input, the urea injection of the urea injection nozzle injected into the urea decomposition chamber is stopped (S300). Thereafter, the reducing agent supply system is terminated.

Alternatively, when the urea injection stop command of 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 controller compares the discharge temperature preset by the controller with the discharge temperature detected by the discharge temperature sensor (S500).

When the detected discharge temperature is less than the preset discharge temperature, the controller determines that it is difficult to thermally decompose the urea injected by the heat amount of the fluid introduced into the urea decomposition chamber and stops urea injection of the urea injection nozzle (S300).

Alternatively, when the detected discharge temperature is equal to or higher than the preset discharge temperature, the controller determines whether an urea injection stop command is input (S200).

With such a configuration, in the control method of the reducing agent supply system according to the first embodiment of the present invention, when the detected discharge temperature is less than the preset discharge temperature, the controller is sprayed with the heat amount of the fluid introduced into the urea decomposition chamber. It may be difficult to pyrolyze urea, so that urea injection of the urea injection nozzle can be stopped. Therefore, the control method of the reducing agent supply system can effectively prevent the generation of by-products due to undecomposition of urea inside the urea decomposition chamber.

In addition, it is also possible to prevent the reduction of the nitrogen oxide purification efficiency of the exhaust gas due to the by-products generated thereby.

Hereinafter, a control process of a reducing agent supply system according to a second embodiment of the present invention will be described with reference to FIGS. 1 and 3. In addition, the reducing agent supply system mentioned in the control process of the reducing agent supply system according to the second embodiment may be the same as the configuration of the reducing agent supply system 101 of FIG.

Determine the amount of urea injection (S100). The urea injection amount is determined by mapping the control unit 400 based on the stored data according to the load of the power generator and the environmental conditions in which the power generator is located.

The amount of heat required to pyrolyze the determined urea is calculated (S110). That is, the amount of heat of the fluid required to pyrolyze the determined amount of urea injection into the reducing agent is calculated.

The fluid having a calorific value (thermal energy) is supplied to the urea decomposition chamber (S120). That is, the fluid having the calculated calorific value 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 inflow fluid temperature or inflow flow rate is the same as the target value (S140). When 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 a calorific value (thermal energy) (S120).

Alternatively, when the detected inflow fluid temperature or inflow flow rate is the same as the target value, the urea injection nozzle injects urea (Urea) into the urea decomposition chamber (S150).

It is determined whether an injection stop command of the urea injection nozzle injected from the urea injection nozzle is input (S200). That is, it is determined whether the urea injection stop command of the urea injection nozzle has been previously input.

When the urea injection stop command of the urea injection nozzle is input, the urea injection of the urea injection nozzle injected into the urea decomposition chamber is stopped (S300). Thereafter, the reducing agent supply system is terminated.

Alternatively, when the urea injection stop command of 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 the first reference temperature (S600). Specifically, when the discharge temperature detected by the discharge temperature sensor is less than the first reference temperature, the amount of urea injection is adjusted (S610).

When the discharge temperature detected by the discharge temperature sensor is less than the first reference temperature, the controller controls the amount of urea injection that is injected by the urea injection nozzle to be reduced.

Alternatively, when the discharge temperature detected by the discharge temperature sensor is greater than or equal to the first reference temperature, it is determined whether the urea injection stop power is input (S200).

When the urea injection amount injected by the urea injection nozzle is reduced, the discharge temperature of the fluid discharged from the urea decomposition chamber is redetected (S620). Specifically, when the urea injection amount injected by the urea injection nozzle is reduced, the discharge temperature sensor redetects the discharge temperature of the fluid discharged from the urea decomposition chamber.

The redetected discharge temperature is compared with the second reference temperature (S700). In this case, the first reference temperature and the second reference temperature are temperature information values preset by the controller, and the second reference temperature has a temperature relatively lower than the first reference temperature.

If the redetected discharge temperature is less than the second reference temperature, the urea injection of the urea injection nozzle is stopped (S300). Specifically, the control unit stops the urea injection that the urea injection nozzle is injected into the urea decomposition chamber. Thereafter, the reducing agent supply system is terminated.

That is, when the redetected discharge temperature is less than the second reference temperature, the controller may stop the urea injection of the urea injection nozzle by determining that the reduced amount of urea injection is also difficult to thermally decompose with the heat amount of the fluid currently passing through the urea decomposition chamber. .

Alternatively, when the redetected discharge temperature is equal to or higher than the second reference temperature, the controller redetects the temperature of the fluid discharged from the urea decomposition chamber. In addition, the discharge temperature detected again and the first reference temperature is compared (S600).

With this configuration, the control method of the reducing agent supply system according to the second embodiment of the present invention includes a first reference temperature and a second reference temperature lower than the first reference temperature. Therefore, after first reducing the urea injection amount, the controller can determine whether the reduced urea injection amount can be thermally decomposed. In addition, when it is determined that the reduced amount of urea injection is difficult to pyrolyze the reducing agent decomposition chamber, the controller may stop urea injection of the urea injection nozzle to prevent the generation of by-products due to undecomposition of urea in the urea decomposition chamber.

Hereinafter, a control process of a reducing agent supply system according to a third embodiment of the present invention will be described with reference to FIGS. 1 and 4. Hereinafter, the reducing agent supply system mentioned in the control process of the reducing agent supply system according to the third embodiment may be the same as the configuration of the reducing agent supply system 101 of FIG.

Determine the amount of urea injection (S100). The urea injection amount is determined by mapping the control unit 400 based on the stored data according to the load of the power generator and the environmental conditions in which the power generator is located.

The amount of heat required to pyrolyze the determined urea is calculated (S110). That is, the amount of heat of the fluid required to pyrolyze the determined amount of urea injection into the reducing agent is calculated.

The fluid having a calorific value (thermal energy) is supplied to the urea decomposition chamber (S120). That is, the fluid having the calculated calorific value 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 inflow fluid temperature or inflow flow rate is the same as the target value (S140). When 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 a calorific value (thermal energy) (S120).

Alternatively, when the detected inflow fluid temperature or inflow flow rate is the same as the target value, the urea injection nozzle injects urea (Urea) into the urea decomposition chamber (S150).

It is determined whether an injection stop command of the urea injection nozzle injected from the urea injection nozzle is input (S200). That is, it is determined whether the urea injection stop command of the urea injection nozzle has been previously input.

When the urea injection stop command of the urea injection nozzle is input, the urea injection of the urea injection nozzle injected into the urea decomposition chamber is stopped (S300). Thereafter, the reducing agent supply system is terminated.

Alternatively, when the urea injection stop command of 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 the first reference temperature (S600). Specifically, when the discharge temperature detected by the discharge temperature sensor is less 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 controller may adjust the heater and the blower included in the calorie control unit so as 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 greater than the first reference temperature, it is determined whether a urea injection stop command is input (S200).

After adjusting the heat amount is increased, the inlet temperature of the fluid flowing into the urea decomposition chamber is detected (S640).

In addition, the inlet temperature of the detected fluid and the preset inlet temperature is compared (S650). Specifically, the inlet temperature sensor detects the temperature of the fluid entering the urea decomposition chamber. The inlet temperature of the fluid flowing into the urea decomposition chamber is preset in the control unit.

When the detected inflow temperature exceeds the preset inflow temperature, the controller 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 preset inflow temperature, the controller determines that the urea injected into the urea decomposition chamber can be decomposed at the current temperature, thereby maintaining the temperature of the heater at the current temperature and maintaining only the speed of the blower. Increasing the amount of heat of the fluid entering the urea decomposition chamber.

Alternatively, when the detected inflow temperature is less than or equal to the preset inflow temperature, the controller redetects the temperature of the fluid discharged from the urea decomposition chamber (S620). Specifically, the discharge temperature sensor redetects the temperature of the fluid discharged from the urea decomposition chamber.

The redetected discharge temperature is compared with the second reference temperature (S700). In this case, the first reference temperature and the second reference temperature are temperature information values preset by the controller, and the second reference temperature has a temperature relatively lower than the first reference temperature.

If the redetected discharge temperature is less than the second reference temperature, the controller stops urea injection (S300). Specifically, when the redetected discharge temperature is less than the second reference temperature, the controller determines that the urea injected into the urea decomposition chamber cannot be thermally decomposed and stops urea injection of the urea injection nozzle injected into the urea decomposition chamber.

If the redetected discharge temperature is equal to or greater than the second reference temperature, the discharge temperature sensor redetects the discharge temperature of the fluid discharged from the urea decomposition chamber (S400). In addition, the controller compares the discharge temperature of the redetected fluid with the first reference temperature (S600).

In addition, when only the flow rate of the fluid flowing into the urea decomposition chamber is increased, the flow rate of the fluid flowing into the urea decomposition chamber is detected (S810). Specifically, the inflow flow sensor detects the inflow flow rate of the fluid flowing into the urea decomposition chamber.

In addition, the detected inflow flow rate and the preset inflow flow rate are compared (S820). In addition, the inflow flow rate information is preset in the control unit.

For example, the inflow flow rate information preset in the controller may be a value in consideration of the flow rate of the fluid passing through the urea decomposition chamber and the pyrolysis reaction of the injected urea. That is, when the fluid passes through the urea decomposition chamber at a too high flow rate, the process of pyrolysis due to the contact of the fluid with the urea injected in the urea decomposition chamber may not be performed smoothly, and byproducts may be generated by undecomposition. .

If the detected inflow flow rate exceeds the preset inflow flow rate, urea injection is stopped (S300). Specifically, when the detected inflow flow rate exceeds the preset inflow flow rate, the controller controls the urea injection nozzle to stop urea injection inside the urea decomposition chamber.

If the detected inflow flow rate is equal to or less than the preset inflow flow rate, the discharge temperature of the fluid discharged from the urea decomposition chamber is redetected (S620). In addition, the discharge temperature redetected and the second reference temperature is compared (S700).

With such a configuration, the control method of the reducing agent supply system according to the third embodiment of the present invention increases the amount of heat of the fluid flowing therein when it is difficult to pyrolyze the urea injected by the amount of fluid flowing into the urea decomposition chamber. Can effectively pyrolyze urea.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is represented by the following detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

100: urea decomposition chamber 101: reducing agent supply system
200: urea injection nozzle 300: discharge temperature sensor
400: control unit 500: calorie control unit
600: inflow temperature sensor 700: inflow flow sensor

Claims (9)

Urea decomposition chamber into which fluid is introduced;
A urea injection nozzle for injecting urea into the urea decomposition chamber;
A discharge temperature sensor detecting a temperature of a fluid discharged from the urea decomposition chamber; And
And a control unit comparing the discharge temperature detected by the discharge temperature sensor one or more times with a preset discharge temperature to control the amount of urea injection injected into the urea decomposition chamber through the urea injection nozzle,
The control unit,
When the discharge temperature detected by the discharge temperature sensor is less than a first reference temperature, the urea injection amount of the urea injection nozzle is reduced,
Reducing agent supply system, characterized in that to stop the urea injection of the urea injection nozzle when the discharge temperature re-detected by the discharge temperature sensor after the urea injection amount is lower than the second reference temperature lower than the first reference temperature . delete Urea decomposition chamber into which fluid is introduced;
A urea injection nozzle for injecting urea into the urea decomposition chamber;
A discharge temperature sensor detecting a temperature of a fluid discharged from the urea decomposition chamber;
A control unit for controlling the amount of urea injection injected into the urea decomposition chamber through the urea injection nozzle by comparing the discharge temperature detected at least once by the discharge temperature sensor with a preset discharge temperature; And
It includes a calorie control unit for controlling the flow rate or temperature of the fluid flowing into the urea decomposition chamber,
The control unit,
When the discharge temperature detected by the discharge temperature sensor is less than the first reference temperature, by controlling the calorific value control unit to adjust the calorific value of the fluid flowing into the urea decomposition chamber,
And the urea injection of the urea injection nozzle is stopped when the discharge temperature redetected by the discharge temperature sensor is lower than the second reference temperature lower than the first reference temperature. In claim 3,
Further comprising an inlet temperature sensor for detecting the temperature of the fluid flowing into the urea decomposition chamber,
The control unit,
After controlling the calorie control unit, if the inlet temperature detected by the inlet temperature sensor exceeds a preset inlet temperature, the calorie control unit is controlled to increase the flow rate of the fluid to the urea decomposition chamber,
And when the inflow temperature detected by the inflow temperature sensor is equal to or less than a preset inflow temperature, the discharge temperature redetected by the discharge temperature sensor and the second reference temperature are compared. In claim 4,
Further comprising an inflow flow rate sensor for detecting the flow rate of the fluid flowing into the urea decomposition chamber,
The control unit,
After controlling the calorific value control unit to increase the flow rate of the fluid to the urea decomposition chamber, when the inflow flow rate of the fluid detected by the inflow flow sensor exceeds the inflow flow rate of the predetermined fluid, urea injection of the urea injection nozzle To stop,
If the inflow flow rate of the fluid detected by the inflow flow sensor is less than the inflow flow rate of the predetermined fluid, the reducing agent supply system, characterized in that the discharge temperature re-detected by the discharge temperature sensor and the second reference temperature is compared. . Determining an amount of urea injection;
Calculating calories needed to decompose the determined urea injection amount;
Supplying the calculated amount of fluid to a urea decomposition chamber;
Injecting urea into the urea decomposition chamber;
Detecting a discharge temperature of a fluid discharged from the urea decomposition chamber;
Comparing the detected discharge temperature with a first reference temperature;
Reducing the amount of urea injected to the urea decomposition chamber when the detected discharge temperature is less than the first reference temperature;
Re-detecting the discharge temperature of the fluid discharged from the urea decomposition chamber after the urea injection amount is reduced;
Comparing the redetected discharge temperature with a second reference temperature lower than the first reference temperature; And
Stopping urea injection in the urea decomposition chamber when the redetected discharge temperature is less than a second reference temperature;
Control method of the reducing agent supply system comprising a. Determining an amount of urea injection;
Calculating calories needed to decompose the determined urea injection amount;
Supplying the calculated amount of fluid to a urea decomposition chamber;
Injecting urea into the urea decomposition chamber;
Detecting a discharge temperature of a 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 less than the first reference temperature; And
Re-detecting the discharge temperature of the fluid discharged from the urea decomposition chamber after adjusting the calorific value of the fluid;
Stopping the urea injection in the urea decomposition chamber when the redetected discharge temperature is less than a second reference temperature lower than the first reference temperature.
Control method of the reducing agent supply system comprising a. In claim 7,
Detecting an inlet temperature of the fluid flowing into the urea decomposition chamber before redetecting a discharge temperature of the fluid discharged from the urea decomposition chamber;
Comparing the detected inflow temperature with a preset inflow temperature; And
Increasing the flow rate of the fluid flowing into the urea decomposition chamber when the detected inflow temperature exceeds the predetermined inflow temperature
Control method of the reducing agent supply system further comprising. In claim 8,
Increasing the flow rate of the fluid flowing into the urea decomposition chamber and detecting an inflow flow rate of the fluid flowing into the urea decomposition chamber;
Comparing the detected inflow flow rate with a preset inflow flow rate; And
Stopping the urea injection in the urea decomposition chamber when the detected inflow flow rate exceeds the predetermined inflow flow rate
Control method of the reducing agent supply system further comprising.

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