Stack outlet white smoke reduction device

Abstract

To provide a system of most suitably decreasing white smoke at the outlet of a stuck, particularly for decreasing white smoke discharged therefrom without increasing the differential pressure in a HRSG cogeneration system.SOLUTION: A stuck 500 includes a combustion device 10520 disposed outside an exhaust separation plate to communicate with the outer space of the exhaust separation plate, which combustion device further includes a plurality of gas ejection ports protruding to the outer space of the exhaust separation plate, a plurality of gas flow passages each flowing gas to the gas ejection port, and a connection plate with the flow passages connected thereto, formed along the outer circumference of the stuck.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a stack outlet white smoke reduction device.

Background Art

[0002] Recently, due to the change in the perception of environmental pollution problems and the strengthening of regulations, environmental pollution problems in the industrial field have been given priority consideration since the design stage.

[0003] Generally, in industries that use cooling water to cool equipment, products, etc., exhaust gas containing water vapor is inevitably generated. The exhaust gas contains a large amount of moisture and various substances, and when discharged from the chimney, a white smoke phenomenon occurs. The lower the atmospheric temperature and the higher the humidity, the more water vapor cools and condenses, and the larger the amount of white smoke visualized as small water droplets. Such a phenomenon occurs particularly frequently in winter.

[0004] Although such white smoke has no impact on pollutants, there is a continuous situation where petitions have been made due to misidentification as a pollutant due to its visual effect. A separate device for preventing white smoke is required.

[0005] In order to reduce white smoke, it is effective to remove the water vapor contained in the exhaust gas by using a method of cooling and dehumidifying the exhaust gas before the hot exhaust gas is discharged from the chimney. However, the cost of the related facilities is at least more than 10 billion won, and additional land is required.

[0006] Particularly, in the case of HRSG cogeneration, it is located near a large city for heat supply to residents, but high land prices are formed near large cities. As a result, high investment costs are required for purchasing additional land, which increases the financial burden on operators attempting to construct a white smoke reduction device.

[0007] In addition, additional heat exchange equipment for cooling the exhaust gas inside the HRSG cogeneration increases the differential pressure of the exhaust gas. When the differential pressure increases by 1 mbar (10 mmH2O), the GT output results in a power production loss of approximately 0.15 MW. From the perspective of power generation companies, this is the actual situation where facility construction is avoided, and it may also be the reason why white smoke reduction equipment using cooling and dehumidification methods cannot be used at home and abroad yet.

[0008] Conventionally, in order to reduce the white smoke discharged from the stack, technologies have been disclosed that preheat the exhaust gas supplied to the stack or increase its temperature, and mix the warm and dry anti-white smoke air with the outlet combustion exhaust gas that is moist and likely to condense into a mist in the air, thereby reducing the relative humidity of the combustion exhaust gas to prevent white smoke.

[0009] For example, Japanese Patent Laid-Open No. 2002-129984 relates to a method and apparatus for preventing white smoke in a gas turbine facility, and discloses that a part of the high-temperature exhaust gas generated from the gas turbine device (22) is supplied to the white smoke control device (30) and then moves to the stack (26). Such technologies require a large flow rate to prevent exhaust gas cooling due to the use of a low air temperature. When reducing white smoke by raising the overall temperature of the chimney exhaust gas, the white smoke reduction efficiency decreases.

[0010] As another example, Korean Registered Patent No. 10-2067302 relates to a method for starting a pressurized flow path system, and discloses that the exhaust gas is preheated by a preheater (70) for preventing white smoke and then moves to a flue gas treatment tower (80). However, such technologies generate a differential pressure due to the use of an air preheater, which has the problem of increasing the operating cost of increased power consumption. In addition, a large flow rate is required to prevent exhaust gas cooling due to the use of a low air temperature. When reducing white smoke by raising the overall temperature of the chimney exhaust gas, the white smoke reduction efficiency decreases.

Prior Art Documents

Patent Documents

[0011]

Patent Document 1

[0012] The present invention has been devised to solve the above-described problems. Specifically, the present invention is a technology for optimally reducing white smoke in a stack. In particular, the present invention is a technology for reducing the discharged white smoke without increasing the differential pressure of the HRSG cogeneration system.

[0013] Further, the present invention is a technology for effectively reducing white smoke without requiring equipment costs and additional land. [Means for Solving the Problems]

[0014] An embodiment of the present invention for solving the above-described problems includes an inlet duct 100 into which exhaust gas flows; a superheater 200 into which the exhaust gas flows through the inlet duct 100; an evaporator 300 located at the rear end of the superheater 200; an economizer 400 communicating with the superheater 200 and including a heat exchanger 410; and a stack 500 located at the rear end of the economizer 400. The stack 500 includes a gas injection device 510 located outside the upper end of the stack 500. The superheater 200 includes a bypass flow path 210 connected to the gas injection device 510, and an inlet fan 211 is located on the bypass flow path 210. The gas injection device 510 is located along the outer periphery of the upper end of the stack 500, and includes n first to nth injection devices 510, each of which is linear. Each of the first to nth injection devices includes first to nth holes 511c extending in the longitudinal direction. First to nth dampers 512 are located on one side of the first to nth holes 511c, and the angle of the exhaust gas injected from the first to nth holes 511c is adjusted. A system is provided.

[0015] In one embodiment, it may further include a temperature sensor located at the upper end of the stack 500 for sensing the temperature of the exhaust gas discharged from the stack 500; and a control unit for controlling the angles of the first to nth dampers 512 according to the value measured by the temperature sensor.

[0016] In one embodiment, the first to nth injection devices 510 may have an n-sided polygon structure in which the angles between adjacent injection devices 510 are the same.

[0017] In one embodiment, it may further include a temperature sensor located on one side of the stack 500 for sensing the temperature of the exhaust gas discharged from the stack 500; and a control unit for controlling the intensity of the inflow fan 211 according to the value measured by the temperature sensor.

[0018] Another embodiment of the present invention for solving the above problems includes an inflow duct 100 into which exhaust gas flows; a superheater 200 into which exhaust gas flows through the inflow duct 100; an evaporator 300 located at the rear end of the superheater 200; an economizer 400 communicating with the superheater 200 and including a heat exchanger 410; and a stack 10500 located at the rear end of the economizer 400. The stack 10500 includes an exhaust gas separation plate 10510 located at a predetermined interval from the inner surface of the stack 10500, and a combustion device 10520 located outside the stack 10500 at the end in the height direction of the stack 10500 and communicating with the outer space of the exhaust gas separation plate 10510. The combustion device 10520 further includes a gas discharge port 10521 protruding into the outer space of the exhaust gas separation plate 10510, a gas flow path 10522 for flowing gas through the gas discharge port 10521, and a coupling plate 10523 to which the gas flow path 10522 is coupled and which is formed along the outer periphery of the stack 10500, and provides a system.

[0019] In other embodiments, the exhaust gas can flow into the outer space of the exhaust gas separation plate 10510 through the exhaust gas separation plate 10510, and gas can be supplied from the gas discharge port 10521 to react with the exhaust gas.

[0020] In other embodiments, the gas flow paths 10522 are located at a number of positions along the periphery of the coupling plate 10523, and the coupling plate 10523 may be formed with a number of holes having the same radial center so that the gas flow paths 10522 are coupled thereto.

[0021] In other embodiments, an ignition device located on one side of the gas discharge port 10521 can be further included.

[0022] In other embodiments, a temperature sensor for sensing the temperature of the exhaust gas discharged from the stack 10500 on one side of the stack 10500; and a control unit for controlling the flow rate of the gas flowing into the gas discharge port 10521 according to the value measured by the temperature sensor; can be further included.

[0023] In other embodiments, a number of valves respectively located on the number of gas flow paths 10522 are further included, and the control unit can individually control the opening and closing of the number of valves according to the value measured by the temperature sensor.

Advantages of the Invention

[0024] According to the present invention, the following effects are achieved.

[0025] The present invention includes a structure capable of optimally reducing white smoke in a stack, and can efficiently reduce white smoke without increasing the overall temperature of the stack.

[0026] In particular, the present invention can reduce the discharged white smoke without increasing the differential pressure in the HRSG cogeneration system.

[0027] In addition, the present invention does not require equipment costs and additional land, and can effectively reduce white smoke.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0029] In some cases, to avoid the present invention's concept from being ambiguous, known structures and devices are omitted or shown in the form of block diagrams centered on the core functions of each structure and device.

[0030] In addition, when explaining the embodiments of the present invention, if it is determined that a specific description of a known function or configuration makes the gist of the present invention unnecessarily difficult to understand, the detailed description thereof will be omitted. The terms described later are terms defined in consideration of the functions in the embodiments of the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definition should be given based on the content throughout this specification.

[0031] The present invention includes an inlet duct 100, a superheater 200, an evaporator 300, an economizer 400, stacks 500, 10500, and a power generation unit 600.

[0032] Exhaust gas flows into the inlet duct 100.

[0033] The exhaust gas flowing through the inlet duct 100 is high-temperature exhaust gas.

[0034] At this time, the size and shape of the inlet duct 100 are not limited to those shown in the drawings.

[0035] The superheater 200 has exhaust gas transmitted from the inlet duct 100 and superheats the transmitted exhaust gas to a high temperature.

[0036] At this time, the method of superheating the exhaust gas transmitted to the superheater 200 is not limited to a specific method.

[0037] The superheater 200 can include a bypass flow path 210 and a first flow path 220.

[0038] The bypass flow path 210 is connected to a stack 500, which will be described later, from the superheater 200.

[0039] Specifically, the bypass flow path 210 is connected to a gas injection device 510 so as to supply the superheated exhaust gas from the superheater 200 to the gas injection device 510, which will be described later.

[0040] At this time, the position, shape, and length of the bypass channel 210 are not limited to those shown in the drawings, and it is sufficient if the exhaust gas is supplied from the superheater 200 to the gas injection device 510.

[0041] An inflow fan 211 is located on the bypass channel 210.

[0042] The bypass channel 210 is formed on one side of the superheater 200 and can supply high-temperature exhaust gas to the gas injection device 510.

[0043] In particular, the bypass channel 210 can be located on the rear end side of the superheater 200.

[0044] The operation of the inflow fan 211 can be controlled by a control unit described later. The operation of the inflow fan 211 can be controlled using the temperature in the stack 500. The flow velocity and flow rate of the exhaust gas supplied to the gas injection device 510 through the inflow fan 211 can be adjusted. A detailed description thereof will be given later.

[0045] Further, a damper is located at the rear end of the inflow fan 211, and the flow rate of the exhaust gas flowing in through the bypass channel 210 can be adjusted by adjusting the angle of the damper. A detailed description thereof will be given later.

[0046] At this time, the type of the inflow fan 211 may be an ID (induce) fan, but is not limited thereto.

[0047] In this way, in the present invention, high-temperature exhaust gas in the superheater 200 is supplied to the gas injection device 510, and white smoke can be reduced by using this. A detailed description thereof will be given later.

[0048] The first channel 220 is a channel connected from the superheater 200 to the steam turbine 610, and the superheater 200 supplies superheated steam to the steam turbine 610.

[0049] The evaporator 300 is located at the rear end of the superheater 200 and absorbs the heat of the exhaust gas to reduce the temperature of the exhaust gas.

[0050] The evaporator 300 includes a second flow path 310.

[0051] The second flow path 310 is a flow path connected from the evaporator 300 to the superheater 200, supplies the steam generated after the evaporator 300 absorbs the heat of the exhaust gas to the superheater 200, and the superheater 200 can use this to supply the superheated steam to the steam turbine 610.

[0052] The economizer 400 uses the residual heat of the exhaust gas to heat the feed water.

[0053] The economizer 400 communicates with the superheater 200.

[0054] The economizer 400 may be located at the rear end of the evaporator 300 in FIG. 1, but is not limited thereto and may be located at the front end of the evaporator 300.

[0055] The inside of the economizer 400 includes a heat exchanger 410, and can absorb the residual heat of the exhaust gas to increase the temperature of the fluid flowing inside the heat exchanger 410.

[0056] Also, the economizer 400 further includes a third flow path 420, and the third flow path 420 is connected to the outlet of the heat exchanger 410 and the evaporator 300.

[0057] The third flow path 420 can supply the warm water that has absorbed the residual heat at the outlet of the heat exchanger 410 to the evaporator 300, and this can be used in the evaporator 300.

[0058] The stacks 500, 10500 are located at the rear end of the economizer 400 and discharge the exhaust gas to the outside.

[0059] The stack 500 according to the first to third embodiments includes a gas injection device 510.

[0060] At this time, the upper end of the stack 500 may be circular, but it is not limited to this.

[0061] The gas injection device 510 is located outside the height-direction end of the stack 500.

[0062] The gas injection device 510 is supplied with the overheated exhaust gas from the bypass flow path 210 described above.

[0063] The gas injection device 510 can inject high-temperature exhaust gas from the outside of the stack 500.

[0064] At this time, the gas injection device 510 may have a structure that is coupled and fixed to the stack 500, and is not limited to a specific coupling or fixing method.

[0065] Further, the stack 10500 according to the fourth embodiment includes an exhaust gas separation plate 10510 (see FIG. 5) and a combustion device 10520.

[0066] In the present invention, in the first to third embodiments, the gas injection device 510 of the stack 500 will be described.

[0067] Referring to FIG. 2, the first embodiment will be described.

[0068] In the first embodiment, the gas injection device 510 is formed along the outer periphery of the upper end of the stack 500.

[0069] The gas injection device 510 can have different shapes depending on the structure of the upper end of the stack 500, but generally, it may be formed of a circular tube.

[0070] Further, a number of holes 511a are formed along the inner periphery of the gas injection device 510.

[0071] At this time, referring to FIG. 2, the hole 511a is formed in a circular shape with a constant size, but it is not limited thereto. The size of the hole 511a can be adjusted and it is of course not necessary to be formed with a constant size.

[0072] The hole 511a is formed along the inner circumference of the gas injection device 510, but may be formed so as to be radially in the same position in the state of being installed on the stack 500.

[0073] Thereby, the discharge angle of the exhaust gas ejected from the hole 511a can be discharged at an angle of 45 degrees to 80 degrees.

[0074] In FIG. 2, it is shown that the hole 511a is ejected at an angle a, and the angle a can include the range of 45 degrees to 80 degrees. In FIG. 2, the dotted line is the exhaust gas rising along the stack 500, and it is shown that it meets the exhaust gas discharged from the hole 511a and rises after increasing the temperature (thick arrow).

[0075] Referring to FIG. 3, the second embodiment will be described.

[0076] In the second embodiment, the gas injection device 510 can be formed along the outer circumference of the upper end of the stack 500.

[0077] The gas injection device 510 may have different shapes depending on the structure of the upper end of the stack 500, but generally, it may be formed of a circular pipe.

[0078] The hole 511b is formed to extend in the radial direction along the radial inner circumference of the gas injection device 510, and the hole 511b has a predetermined width.

[0079] In FIG. 3, it is shown that the hole 511b is ejected at an angle b, and the angle b can include the range of 45 degrees to 80 degrees. In FIG. 3, the dotted line is the exhaust gas rising along the stack 500, and it is shown that it meets the exhaust gas discharged from the hole 511b and rises after increasing the temperature (thick arrow).

[0080] Referring to FIG. 4, a third embodiment will be described.

[0081] In the third embodiment, the gas injection device 510 is formed by n linear first to nth injection devices 510 (n is a natural number of 2 or more) along the outer periphery of the height direction end.

[0082] The gas injection device 510 can have different shapes depending on the structure of the upper end of the stack 500, but generally, it may be formed of a circular tube. The first to nth injection devices 510 may be formed at the same angle to each other.

[0083] That is, if the inner centers of the first to nth injection devices 510 are connected, it may have the shape of a regular n-sided polygon.

[0084] At this time, in FIG. 4, n is illustrated as 10, but it is not limited thereto.

[0085] Each of the first to nth injection devices 510 includes first to nth holes 511c formed to extend in the longitudinal direction.

[0086] The first to nth holes 511c are formed to extend in the radial direction along the radial inner periphery of the first to nth injection devices 510, and the first to nth holes 511c have a predetermined width.

[0087] On one side of the first to nth holes 511c, first to nth dampers 512 are located.

[0088] The first to nth dampers 512 are coupled to the lower ends of the first to nth holes 511c, and by rotating up and down, the discharge angle of the exhaust gas ejected from the first to nth holes 511c can be adjusted.

[0089] At this time, the first to nth dampers 512 can be rotated by a rotation axis (not shown).

[0090] The first to nth dampers 512 can have their angles adjusted by the operation of a control unit described later. A detailed explanation regarding this will be provided later.

[0091] In FIG. 4, it is shown that the gas is injected from the hole 511c at an angle c, and the angle c can include the range of 45 degrees to 80 degrees. In FIG. 4, the dotted line represents the exhaust gas rising along the stack 500, and it is shown that the exhaust gas discharged from the hole 511c meets the exhaust gas and rises in temperature as it ascends (thick arrow).

[0092] Referring to FIG. 5, the fourth embodiment will be described.

[0093] In the present invention, in the fourth embodiment, the exhaust gas separation plate 10510 and the combustion device 10520 of the stack 10500 will be described.

[0094] In FIG. 5, it is shown that the gas is discharged from the gas outlet 10521 and the exhaust gas flowing along the stack 10500 is guided to the outer space of the exhaust gas separation plate 10510.

[0095] The exhaust gas separation plate 10510 is positioned at a predetermined interval from the inner surface of the stack 10500.

[0096] The exhaust gas separation plate 10510 is positioned at a predetermined interval from the inner surface of the stack 10500, and an outer space of the exhaust gas separation plate 10510 is formed.

[0097] At this time, the outer space of the exhaust gas separation plate 10510 is a space formed between the inner surface of the stack 10500 and the exhaust gas separation plate 10510.

[0098] At this time, the structure fixed to the exhaust gas separation plate 10510 is not limited to a specific structure.

[0099] The exhaust gas separation plate 10510 can guide the exhaust gas moving upward along the stack 10500 to the combustion device 10520.

[0100] At this time, the exhaust gas separation plate 10510 can usually guide 3 to 10% of the exhaust gas to the outside space of the exhaust gas separation plate 10510, but it is not limited thereto.

[0101] In the present invention, the air in the exhaust gas guided to the combustion device 10520 through the exhaust gas separation plate 10510 is used as an oxidant, and the gas ejected from the gas ejection port 10521 described later can be burned. Thereby, the exhaust gas of the stack 10500 can be heated.

[0102] The combustion device 10520 is located outside the height direction end of the stack 10500.

[0103] The combustion device 10520 includes a gas ejection port 10521, a gas flow path 10522, and a coupling plate 10523.

[0104] The gas ejection port 10521 is formed at the end of the gas flow path 10522 where gas flows from the gas flow path 10522.

[0105] The gas ejection port 10521 is formed so as to protrude into the outside space of the exhaust gas separation plate 10510.

[0106] The gas flow path 10522 allows gas to flow to the gas ejection port 10521.

[0107] At this time, the gas flowing from the gas flow path 10522 may be natural gas LNG, but it is not limited thereto.

[0108] The gas flow path 10522 can be located along the periphery of the coupling plate 10523, whereby a large number of gas ejection ports 10521 can be formed.

[0109] Also, a large number of valves can be located on each of the large number of gas flow paths 10522.

[0110] The valve located on the gas flow path 10522 can be controlled to open and close by the control of a control unit described later.

[0111] The coupling plate 10523 is connected to the stack 10500 and is coupled above the stack 10500.

[0112] Around the coupling plate 10523, holes may be formed corresponding to the number of gas flow paths 10522 that can be coupled so that a number of gas flow paths 10522 can be coupled.

[0113] Further, the combustion device 10520 can further include an ignition device.

[0114] The ignition device is located outside the combustion device 10520, and ignition is performed on the gas supplied from the gas flow path 10522 and the exhaust gas flowing along the stack 10500, and an ignition flame can be continuously supplied.

[0115] The ignition device mixes air and gas to disperse and supply combustion gas, is installed on the burner head of a gas burner, and ignition is performed on the mixed gas, and an ignition flame can be continuously supplied.

[0116] The power generation unit 600 is connected to the superheater 200 and can produce electricity.

[0117] The power generation unit 600 includes a steam turbine 610 and a generator 620.

[0118] The steam turbine 610 is connected to the generator 620 and receives the supply of steam superheated from the superheater 200.

[0119] The generator 620 can produce electricity using the steam supplied from the steam turbine 610.

[0120] The present invention can further include a temperature sensor and a control unit.

[0121] The temperature sensor can sense the temperature of the exhaust gas discharged from the stack 500, 10500 on one side of the stack 500, 10500.

[0122] The temperature sensor can be formed on the upper side or the outer end of the stack 500, 10500 to measure the temperature of the discharged exhaust gas, but is not limited thereto.

[0123] The temperature sensor transmits the measured temperature information to the control unit.

[0124] The control unit can control the gas injection device 510 by using the temperature information measured by the temperature sensor.

[0125] The control unit controls the angles of the first to nth dampers 512 according to the value measured by the temperature sensor.

[0126] For example, if the value measured by the temperature sensor is less than the preset value, the control unit can decrease the angles of the first to nth dampers 512 and increase the temperature of the exhaust gas.

[0127] In addition, the control unit can control the intensity of the inflow fan 211 according to the value measured by the temperature sensor.

[0128] For example, if the value measured by the temperature sensor is less than the preset value, the control unit can increase the intensity of the inflow fan 211 and further increase the flow rate of the exhaust gas supplied to the gas injection device 510 through the bypass flow path 210.

[0129] In addition, the control unit can adjust the angle of the damper located at the rear end of the inflow fan 211 as described above to adjust the flow rate of the exhaust gas supplied to the gas injection device 510.

[0130] In addition, the control unit can control the combustion device 10520 by using the temperature information measured by the temperature sensor.

[0131] The control unit can control the flow rate of the gas flowing into the gas discharge port 10521 according to the value measured by the temperature sensor.

[0132] In addition, the control unit can individually control the number of valve openings and closings according to the value measured by the temperature sensor.

[0133] In addition, the control unit can control to temporarily use the gas injection device 510 or the combustion device 10520 according to the present invention during winter days when a large amount of white smoke is particularly observed, using the value measured from the temperature sensor.

[0134] Referring to FIG. 6, the process of reducing white smoke by the white smoke reduction device according to the present invention will be described.

[0135] In order to prevent white smoke, the exhaust gas temperature must be maintained from the low-temperature outside air and diffused at a high altitude, and it is important to reach the dew point at a specific height or more above the upper part outside the stacks 500, 10500. The specific height varies depending on the diameters and cross-sectional areas of the stacks 500, 10500.

[0136] The specific height can be calculated based on complying with the CTI (Cooling Tower Institute) ATC 150 Code, and based on this, a certain ratio or more can be used as a reference according to the diameter of the stacks 500, 10500.

[0137] For example, it is possible to determine whether the dew point is reached at a height of 15 m or more from the outside to the upper part of the stacks 500, 10500, but it is not limited to this.

[0138] In the first to third embodiments of the present invention, it is supplied from the rear end of the superheater 200 to the stack 500 through the bypass flow path 210.

[0139] In particular, in the present invention, a gas injection device 510 is included on the outer periphery of the end of the stack 500, and the exhaust gas flowing through the bypass passage 210 from the gas injection device 510 can be injected. Thus, the high-temperature exhaust gas can be bypassed to the part where moist air (white smoke) is generated due to heat transfer with the outside air to raise the temperature.

[0140] A part (3 - 10%) of the exhaust gas is bypassed to the outlet of the stack 500 through the inflow fan 211, and a heat insulation film is formed around the exhaust gas through injection from the outer contour of the exhaust gas, so that the time for the exhaust gas to reach the dew point can be delayed.

[0141] In the fourth embodiment of the present invention, a combustion device 10520 is included on the outer periphery of the end in the height direction of the stack 10500, and the exhaust gas flowing through the bypass passage 210 from the combustion device 10520 can be injected. Thus, the high-temperature exhaust gas can be burned to the part where moist air (white smoke) is generated due to heat transfer with the outside air to raise the temperature.

[0142] A part (3 - 10%) of the exhaust gas moves to the exhaust gas separation plate 10510, and a heat insulation film around the exhaust gas is formed through injection from the contour of the exhaust gas, so that the time for the exhaust gas to reach the dew point can be delayed.

[0143] In FIG. 6, the stacks 500, 10500 and the temperature distribution on the outer periphery of the stacks 500, 10500 are described.

[0144] FIG. 6(a) shows the temperature distribution of the conventional exhaust gas. Conventionally, white smoke is generated due to the cooling of the exhaust gas by the outside air.

[0145] FIG. 6(b) shows the temperature distribution of the exhaust gas according to the present invention. In the present invention, the temperature on the outer periphery of the stacks 500, 10500 can be increased, and the time for the exhaust gas to reach the dew point can be delayed.

[0146] As a result, as will be described later, the exhaust gas discharged from the stacks 500 and 10500 can rise higher due to buoyancy, the thickness of the layer of the exhaust gas reaching the dew point can be reduced, and the diffusion of white smoke can be prevented.

[0147] Referring to FIGS. 7 and 8, the temperature distribution of the exhaust gas discharged from the stack according to the present invention will be described.

[0148] At this time, the temperature of the outside air is set to -18.7°C.

[0149] FIG. 7(a) shows the temperature distribution of the exhaust gas in a conventional stack, and FIG. 6(b) shows the temperature distribution of the exhaust gas in the system according to the present invention.

[0150] It can be seen from FIG. 7(a) that the exhaust gas discharged from the stack 500 is discharged lower than the exhaust gas discharged from the stacks 500 and 10500 in FIG. 6(b).

[0151] Also, FIG. 8(a) is an enlarged view of FIG. 7(a). Referring to FIG. 8(a), it is shown that in a conventional stack, a low-temperature region of about 2.4 m is formed on the side surface at 15 m from the stack for the exhaust gas.

[0152] On the other hand, referring to FIG. 8(b), it is shown that in the stacks 500 and 10500 according to the present invention, a low-temperature region of about 1.2 m is formed on the side surface at the same height for the exhaust gas.

[0153] As a result, it can be seen that the height of the exhaust gas in the system according to the present invention rises compared to a conventional stack, and the diffusion of white smoke is fast due to the rise of the exhaust gas. Where the diffusion of white smoke is fast in the system according to the present invention, the white smoke can be effectively reduced.

[0154] In the present invention, high-temperature exhaust gas is supplied through the bypass passage 210 to the gas injection device 510 or through the combustion device 10520, so that the temperature of the exhaust gas in the stacks 500, 10500 is increased, and the increased high temperature enables the exhaust gas to rise buoyantly.

[0155] In addition, the gas injection device 510 includes holes 511, and the exhaust gas in the stack 500 that can supply exhaust gas from the holes 511 at a high flow rate can further rise.

[0156] As described above, in this specification, the embodiments shown in the drawings have been described with reference to enable those skilled in the art to easily understand and reproduce the present invention. However, these are merely examples, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible from the embodiments of the present invention. Therefore, the protection scope of the present invention must be determined by the scope of the claims.

Explanation of Reference Numerals

[0157] 100: Inlet duct 200: Superheater 210: Bypass passage 211: Inlet fan 220: First flow path 300: Evaporator 310: Second flow path 400: Economizer 410: Heat exchanger 420: Third flow path 500: Stack 510: Gas injection device 511: Hole 512: Damper 600: Power generation unit 610: Steam turbine 620: Generator 10500: Stack 10510: Exhaust gas separation plate 10520: Combustion device 10521: Gas discharge port 10522: Gas flow path 10523: Coupling plate

Claims

1. An inlet duct (100) into which exhaust gas flows; A superheater (200) into which exhaust gas flows through the inlet duct (100); An evaporator (300) located at the rear end of the superheater (200); An economizer (400) communicating with the superheater (200) and including a heat exchanger (410); and A stack (10500) located at the rear end of the economizer (400); including The stack (10500) includes an exhaust gas separation plate (10510) positioned at a predetermined distance from the inner surface of the stack (10500), and a combustion device (10520) located outside the stack (10500) at the end in the height direction of the stack (10500) and communicating with the outer space of the exhaust gas separation plate (10510), The combustion device (10520) further includes a gas discharge port (10521) protruding into the outer space of the exhaust gas separation plate (10510), a gas flow path (10522) for flowing gas through the gas discharge port (10521), and a coupling plate (10523) to which the gas flow path (10522) is coupled and formed along the outer circumference of the stack (10500), System.

2. Exhaust gas is flowed into the outer space of the exhaust gas separation plate (10510) through the exhaust gas separation plate (10510), and gas is supplied from the gas discharge port (10521) to react with the exhaust gas, The system according to claim 1.

3. The gas flow paths (10522) are located at multiple positions along the periphery of the coupling plate (10523), The coupling plate (10523) is formed with a number of holes having the same radial center so that the gas flow paths (10522) are coupled, The system according to claim 1.

4. Further including an ignition device located on one side of the gas discharge port (10521), The system according to claim 1.

5. A temperature sensor for sensing the temperature of the exhaust gas discharged from the stack (10500) on one side of the stack (10500); and A control unit for controlling the flow rate of the gas flowing through the gas discharge port (10521) according to the value measured by the temperature sensor; further including The system according to claim 3.

6. Further including a plurality of valves respectively located on the multiple gas flow paths (10522); The control unit individually controls the opening and closing of the multiple valves according to the value measured by the temperature sensor, The system according to claim 5.

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