JP2018516339A - Burner system - Google Patents

Abstract

Embodiments of the present invention relate to a burner system. A burner system that raises the temperature of exhaust gas discharged from an engine for use in thermal decomposition of a reducing agent includes a one-side region that raises the temperature of the exhaust gas, and an exhaust gas that has been heated and decomposed in the one-side region. Formed in the other side region where the agent is mixed, the one side region adjacent to the other side region, and an exhaust gas inlet into which the exhaust gas flows, and an exhaust gas outlet through which the exhaust gas that has passed through the other side region is discharged A burner body including: a fuel injection member that is provided on one side of the burner body and injects fuel into one side region of the burner body; an exhaust gas that is provided inside the one side region of the burner body; A partition for moving the exhaust gas flowing in from the inlet toward the fuel injection member; and a reducing agent injection member for injecting a reducing agent into the partition. [Selection] Figure 1

Description

  Embodiments of the present invention relate to a burner system, and more particularly to a burner system that raises the temperature of exhaust gas discharged from an engine for use in thermal decomposition of a reducing agent.

  The engine generates power by burning fuel. The exhaust gas discharged from such an engine contains nitrogen oxides. Nitrogen oxides have harmful effects when discharged to the outside and are subject to exhaust gas regulations.

  Therefore, in the apparatus provided with the engine, another exhaust gas purification apparatus for purifying nitrogen oxides contained in the exhaust gas from the engine is provided.

  In general, the exhaust gas purification device injects urea into the exhaust gas from the engine so that the injected urea and the exhaust gas flow into the reactor. That is, the injected urea is decomposed into isocyanic acid and ammonia depending on the temperature of the exhaust gas, and flows into the reactor. Moreover, the reactor is provided with a catalyst capable of reducing nitrogen oxides into nitrogen and water (or water vapor).

  Therefore, the exhaust gas mixed with the injected reducing agent flowing into the reactor is decomposed into nitrogen and water by passing through the catalyst, and the purified exhaust gas is discharged when discharged to the outside.

  However, when the temperature of the exhaust gas is low, it is difficult to decompose urea into isocyanic acid and ammonia at the temperature of the exhaust gas itself. In this case, ammonia may be contained in the exhaust gas that has passed through the reactor, and if exhausted to the outside, there is a problem of having a harmful effect on the human body.

  In addition, when the urea is not heated at a sufficiently high temperature, deposits are generated and deposited in the reactor or piping.

  Embodiments of the present invention provide a burner system that can effectively thermally decompose a reducing agent.

  According to an embodiment of the present invention, a burner system for raising the temperature of exhaust gas discharged from an engine for use in thermal decomposition of a reducing agent includes a one side region for raising the temperature of the exhaust gas, and a temperature rise in the one side region. Formed in the other side region where the exhaust gas and the pyrolyzed reducing agent are mixed, in the one side region adjacent to the other side region, and through the other side region. A burner body including an exhaust gas discharge port through which exhausted exhaust gas is discharged, a fuel injection member provided on one side of the burner body and injecting fuel into one side region of the burner body, and one side region of the burner body And a partition that moves the exhaust gas flowing in from the exhaust gas inlet of the burner body toward the fuel injection member, and a reducing agent injection member that injects a reducing agent into the partition.

  The burner system described above may further include a vane that is provided inside the other side region and that mixes the pyrolyzed reducing agent that passes through the other side region and the exhaust gas.

  The burner body may further include a new air flow inlet that is provided on one side of the burner body and supplies fresh air so that the fuel is combusted when the fuel supplied by the fuel injection member is injected. it can.

  Further, the reducing agent injection member may be disposed between the new air flow inlet and the exhaust gas inlet.

  The burner system may further include a swirler provided in the one side region and capable of adjusting a length of a flame generated by the fuel injected from the fuel injection member.

  Furthermore, the above-described burner system includes a flame detection member that detects a flame temperature in the one side region, and a control that controls the operation of the reducing agent injection member based on flame temperature information detected by the flame detection member. May further include a portion.

  According to the embodiment of the present invention, the burner system can effectively perform the thermal decomposition of the reducing agent.

It is sectional drawing which shows the burner system which concerns on one Example of this invention. It is a figure which shows the swirler of FIG. It is a figure which shows the operation | movement process of FIG.

  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 implement the embodiments. The present invention can be implemented with various modifications, and is not limited to the examples described in this specification.

  The drawings are shown schematically and are not drawn to scale. In the drawings, relative dimensions and ratios are exaggerated or reduced for clarity and convenience of the drawings, and arbitrary dimensions are merely examples and are not limiting. The same structural elements or parts shown in two or more drawings are given the same reference numerals to indicate that they have the same characteristics.

  The embodiment of the present invention specifically shows a preferred embodiment of the present invention. Thus, various variations of the illustration are anticipated. Accordingly, the examples are not limited to the specific forms shown, but include, for example, manufacturing variations.

  Hereinafter, with reference to FIG.1 and FIG.2, the burner system 101 which concerns on one Example of this invention is demonstrated.

  Generally, an engine emits exhaust gas containing nitrogen oxides generated by fuel combustion. The burner system 101 according to an embodiment of the present invention uses such exhaust gas for reducing agent pyrolysis. As shown in FIG. 1, a burner system 101 according to an embodiment of the present invention includes a burner body 100 including a one side region 110, another side region 120, an exhaust gas inlet 130, and an exhaust gas outlet 140. The fuel injection member 200, the partition 300, and the reducing agent injection member 400 are included.

  Inside the burner body 100, there are provided one side region 110 for raising the temperature of the exhaust gas, and another side region 120 for mixing the heated exhaust gas and the thermally decomposed reducing agent. Specifically, the burner body 100 is formed long in one direction and can be hollow.

  Burner body 100 also includes an exhaust gas inlet 130 through which exhaust gas from the engine flows into burner body 100. The exhaust gas inlet 130 is formed in one side region 110 adjacent to the other side region 120.

  That is, the exhaust gas inlet 130 is provided at an end of the one side region 110 that raises the temperature of the exhaust gas facing the other side region 120 where the heated exhaust gas and the thermally decomposed reducing agent are mixed. It is possible to guide the exhaust gas to flow into the region 110.

  The exhaust gas discharge port 140 is formed in the burner body 100 so that the exhaust gas that has passed through the other side region 120 is discharged. Specifically, the reducing agent thermally decomposed by the heated exhaust gas and the heated exhaust gas are mixed and discharged to a reactor (not shown) through the exhaust gas outlet 140.

  The fuel injection member 200 injects fuel into one side region 110 of the burner body 100. That is, the fuel injection member 200 can inject a fuel into the burner body 100 to form a flame. The temperature of the exhaust gas passing through the burner body 100 is raised by the flame injected from the fuel injection member 200. Specifically, the fuel injection member 200 is provided on one side of the burner body 100.

  That is, the burner body 100 that is long in one direction is provided with a fuel injection member 200 on one side and an exhaust gas discharge port 140 is formed on the other side, and an exhaust gas between the fuel injection member 200 and the exhaust gas discharge port 140. An inflow port 130 is formed.

  The partition wall 300 is provided inside the one side region 110 of the burner body 100. The partition wall 300 guides the exhaust gas flowing from the exhaust gas inlet 130 of the burner body 100 so as to move toward the fuel injection member 200. Specifically, the partition wall 300 is provided in one side region 110 of the burner body 100 and is provided so as to surround a part of the flame formed by the fuel injected from the fuel injection member 200 to form a combustion chamber. be able to.

  That is, the partition wall 300 can guide the exhaust gas flowing in from the exhaust gas inlet 130 so as to flow into the combustion chamber. In addition, the partition wall 300 is connected to the other side region 120, and the exhaust gas that has passed through the partition wall 300 is discharged through the exhaust gas discharge port 140.

  Specifically, the moving direction of the exhaust gas moving from the exhaust gas inlet 130 toward the fuel injection member 200 by the partition wall 300 can be opposed to the direction of the flame formed by the fuel injected into the fuel injection member 200. .

  Therefore, the exhaust gas that flows in from the exhaust gas inlet 130 and moves along the partition wall 300 cools the partition wall 300 provided so as to surround a part of the flame formed by the fuel injected from the fuel injection member 200. Can do. Thereby, the exhaust gas flowing in from the exhaust gas inlet 130 can cool the temperature of the combustion chamber formed inside the partition wall 300 while moving along the partition wall 300.

  The reducing agent injection member 400 injects a reducing agent into the partition wall 300. Specifically, the reducing agent injected by the reducing agent injection member 400 can be urea. That is, the urea injected from the reducing agent injection member 400 is thermally decomposed into ammonia and isocyanic acid in the combustion chamber in which the flame in the partition 300 is formed.

  Therefore, the ammonia formed as described above flows into the reactor provided with the catalyst, and the exhaust gas purification efficiency can be improved.

  Further, since the exhaust gas flowing into the reactor flows into the reactor at a temperature relatively higher than the temperature of the exhaust gas flowing from the exhaust gas inlet 130 of the burner body 100, the exhaust gas temperature is lower than the activation temperature of the catalyst. Catalyst poisoning and reduction in purification efficiency can be effectively prevented.

  Further, since the temperature of the combustion chamber is lowered and cooled by the exhaust gas flowing into the combustion chamber along the partition wall 300, the temperature rise temperature of the reducing agent injected from the reducing agent injection member 400 can be relatively lowered. it can. Therefore, the exhaust gas moving along the partition wall 300 can effectively prevent foreign matters that may be generated when the reducing agent is injected.

  In addition, the burner system 101 according to an embodiment of the present invention may further include a vane 500.

  The vane 500 is provided inside the other side region 120 of the burner body 100 and mixes the pyrolyzed reducing agent that passes through the other side region 120 with the exhaust gas. Specifically, the vane 500 protrudes from the inner peripheral surface of the other side region 120 of the burner body 100, and can effectively mix the pyrolyzed reducing agent and the exhaust gas.

  In the burner system 101 according to an embodiment of the present invention, the burner body 100 may further include a new air flow inlet 150.

  The new airflow inlet 150 is formed on one side of the burner body 100 where the fuel injection member 200 is provided. That is, the fresh air from the outside flowing into the new air flow inlet 150 supplies oxygen to the fuel injected from the fuel injection member 200, whereby the fuel is burned and a flame is formed.

  Accordingly, the new air flow inlet 150 burns the fuel injected from the fuel injection member 200, so that fresh air can be supplied to the one side region of the burner body 100 from the outside.

  Specifically, the exhaust gas inlet 130 can be formed between the new air flow inlet 150 and the exhaust gas outlet 140.

  Further, the reducing agent injection member 400 in the burner system 101 according to the embodiment of the present invention is disposed between the new air flow inlet 150 and the exhaust gas inlet 130.

  The reducing agent injection member 400 is supported by the partition wall 300. The reducing agent injection member 400 is disposed between the new airflow inlet 150 and the exhaust gas inlet 130.

  Specifically, the reducing agent injection member 400 has a sub-flame portion that is relatively lower than the main flame portion formed at the end of the fuel injection member 200 when the fuel injected from the fuel injection member 200 is combusted. It is arranged, and the reducing agent can be injected.

  The temperature of the main flame portion in the region of one end of the fuel injection member 200 is 1200 (Deg. C). When urea is injected into such a high temperature region, the thermally decomposed ammonia may be burned. Accordingly, the reducing agent injection member 400 can inject the urea into the sub-flame portion separated from the end region of the fuel injection member 200, thereby suppressing the generation of foreign matters and effectively thermally decomposing the urea. it can.

  The temperature of the sub-flame part can be in the range of 600 to 700 (Deg. C). Specifically, when the total length of the one side region 110 of the burner body 100 is L, the reducing agent injection member 400 is provided at a position of 0.4 L to 0.6 L from one side of the burner body 100.

  That is, the reducing agent injection member 400 according to an embodiment of the present invention can perform thermal decomposition by injecting a reducing agent into a 600 to 700 (Deg. C) flame formed inside the partition wall 300.

  As an example, a plurality of reducing agent injection members 400 are provided at positions facing each other.

  In addition, the burner system 101 according to an embodiment of the present invention may further include a swirler.

  The swirler 600 can adjust the length of the flame generated by the fuel injected from the fuel injection member 200. Specifically, the swirler 600 can be provided at one end of the fuel injection member 200. In addition, as shown in FIG. 2, the swirler 600 may include a plurality of wing portions 610 that are provided in a flat plate shape and project from the flat plate.

  That is, the swirler 600 rotates around the fuel injection member 200, is rotated by fresh air flowing from the new air flow inlet 150 or exhaust gas flowing from the exhaust gas inlet 130, and is formed by fuel injected from the fuel injection member 200. You can adjust the length of the flame.

  Accordingly, the swirler 600 can adjust the length of the flame so that the temperature of the flame at which the reducing agent injection member 400 injects the reducing agent is in the range of 600 to 700 (Deg. C). The swirler 600 can also be rotated by a power device (not shown).

  In addition, the burner system 101 according to an embodiment of the present invention may further include a flame detection member 700 and a controller 800.

  The flame detection member 700 can detect the temperature of the flame formed in the combustion chamber inside the partition wall 300 by the fuel injected from the fuel injection member 200. Specifically, the flame detection member 700 is provided adjacent to the reducing agent injection member 400 and can detect the temperature of the sub-flame portion where the reducing agent injection member 400 injects the reducing agent.

  The control unit 800 can control the operation of the reducing agent injection member 400 based on the flame temperature information detected by the flame detection member 700. Specifically, a thermal decomposition temperature range in which the reducing agent injected by the reducing agent injection member 400 can be effectively decomposed is already set in the control unit 800. Therefore, the control unit 800 can determine whether or not the burner operates normally by comparing the already set pyrolysis temperature range with the detected flame temperature. When there is a detected flame temperature within the preset thermal decomposition temperature range, the control unit 800 determines that the burner is operating normally and continuously operates the reducing agent injection member 400 to detect it. If the temperature of the flame that has been deviated from the preset thermal decomposition temperature range, the operation of the reducing agent injection member 400 can be stopped by determining that the operation of the burner is abnormal.

  The controller 800 controls the amount of fuel supplied from the fuel injection member 200 and a drive device (not shown) of the swirler 600 when the detected flame temperature is equal to or lower than the preset thermal decomposition temperature range. The length of the flame can be adjusted.

  With reference to FIG. 3, an operation process of the burner system 101 according to an embodiment of the present invention will be described.

  The exhaust gas discharged from the engine flows into the one side region 110 of the burner body 100 through the exhaust gas inlet 130. At this time, the temperature of the inflowing exhaust gas can be low.

  The exhaust gas flowing into the exhaust gas inlet 130 moves in the longitudinal direction of the partition wall 300 along the partition wall 300.

At this time, the control unit 800 operates the fuel injection member 200 to inject fuel into the combustion chamber inside the partition wall 300, thereby igniting a flame by an ignition member (not shown).
During the operation of the fuel injection member 200, fresh air flows into the combustion chamber inside the partition wall 300 through the new air flow inlet 150. The fresh air that has flowed in through the new air flow inlet 150 can help the movement of the exhaust gas from one side of the burner body 100 to the other side of the burner body 100.

  The exhaust gas that moves along the longitudinal direction of the partition wall 300 (the direction opposite to the flame formation direction) flows into the partition wall 300 and passes through the flame to be heated. The control unit 800 operates the reducing agent injection member 400 to inject the reducing agent to the auxiliary flame portion.

  Therefore, the exhaust gas passing through the inside of the partition wall 300 is heated by the flame, and the urea injected into the heated exhaust gas is effectively thermally decomposed into ammonia and isocyanic acid.

  Pyrolyzed ammonia and isocyanic acid and the heated exhaust gas pass through the other side region 120 and are mixed by the vane 500 while forming a swirling flow. That is, the thermally decomposed ammonia and isocyanate and the heated exhaust gas are sufficiently mixed by the vane 500 while moving along the longitudinal direction of the other side region 120.

  The thermally decomposed ammonia and isocyanate and the heated exhaust gas mixed in the other side region are discharged from the burner body 100 through the exhaust gas discharge port 140. The discharged exhaust gas flows into a reactor provided with a catalyst (not shown), decomposed into nitrogen and water (water vapor), and discharged to the outside.

  When a flame is generated in the combustion chamber inside the partition wall 300, the exhaust gas flowing from the exhaust gas inlet 130 and moving along the partition wall 300 can cool the combustion chamber inside the partition wall 300. Therefore, it is possible to prevent overshooting of the temperature inside the partition wall 300 and prevent the combustion of ammonia or the generation of foreign matters that may occur during thermal decomposition of the reducing agent injected from the reducing agent injection member 400 due to overheating inside the partition wall 300. it can.

  With such a configuration, the burner system 101 according to an embodiment of the present invention can perform effective thermal decomposition of the reducing agent.

  Specifically, the burner system 101 causes the fuel injection member 200 to inject fuel by the exhaust gas flowing into one side region of the burner body 100 through the exhaust gas inlet 130 flowing along the longitudinal direction of the partition wall 300. Thus, the temperature inside the partition 300 forming the flame can be effectively cooled. Accordingly, it is possible to prevent the combustion of ammonia or the generation of foreign matter that may occur during the thermal decomposition of urea that is injected inside the partition wall 300.

  Burner system 101 also includes one side region 110 in which burner body 100 raises the temperature of the exhaust gas, and the other side region 120 in which the heated exhaust gas and the thermally decomposed reducing agent are mixed. Thus, the exhaust gas is effectively heated, and the heated exhaust gas is sufficiently mixed with the thermally decomposed reducing agent.

  The embodiments of the present invention have been described above with reference to the accompanying drawings. However, those skilled in the art to which the present invention pertains will understand that the present invention is not limited to various technical ideas and essential features. It will be understood that the present invention can be implemented with a change.

  Moreover, the above-mentioned Example is only illustration of this invention and does not limit this invention. The scope of the present invention is defined by the following claims, and all modifications or variations derived from the claims and their equivalents should be construed as belonging to the scope of the present invention. It is.

  The burner system which concerns on the Example of this invention can be used in order to raise the temperature of the waste gas discharged | emitted from an engine, in order to utilize for the thermal decomposition of a reducing agent.

Claims (6)

A burner system that raises the temperature of exhaust gas discharged from an engine for use in thermal decomposition of a reducing agent,
Formed in one side region for raising the temperature of the exhaust gas, another side region where the exhaust gas heated in the one side region and the pyrolyzed reducing agent are mixed, and the one side region adjacent to the other side region A burner body including an exhaust gas inlet into which exhaust gas flows and an exhaust gas outlet through which the exhaust gas that has passed through the other side region is discharged;
A fuel injection member that is provided on one side of the burner body and injects fuel into one side region of the burner body;
A partition provided inside one side region of the burner body, and moving the exhaust gas flowing in from the exhaust gas inlet of the burner body toward the fuel injection member;
And a reducing agent injection member that injects a reducing agent into the partition wall.   The burner system according to claim 1, further comprising a vane that is provided inside the other side region and that mixes the pyrolyzed reducing agent that passes through the other side region and the exhaust gas.   The burner body further includes a new air flow inlet that is provided on one side of the burner body and supplies fresh air so that the fuel is combusted when the fuel supplied by the fuel injection member is injected. The burner system described.   The burner system according to claim 3, wherein the reducing agent injection member is disposed between the new airflow inlet and the exhaust gas inlet.   The burner system according to claim 1, further comprising a swirler provided in the one side region and capable of adjusting a length of a flame generated by the fuel injected from the fuel injection member. A flame detection member for detecting the temperature of the flame in the one side region;
The burner system according to any one of claims 1 to 5, further comprising: a control unit that controls an operation of the reducing agent injection member based on flame temperature information detected by the flame detection member.

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