System of belt type roasting machine for denitration by using return hot air

Abstract

The invention discloses a system of a belt type roasting machine for denitration by using return hot air, which comprises a return hot air blower, a first heat exchanger, a second heat exchanger, a second heat exchanger, a third heat exchanger, a third heat exchanger, a fourth heat exchanger, a fourth heat exchanger and a fourth heat exchanger, the first heat exchanger comprises a first heat exchange gas flow path and a second heat exchange gas flow path, the first heat exchanger comprises a first heat exchange gas flow path and a second heat exchange gas flow path, the first heat exchange gas flow path is communicated between an air box of the belt type roasting machine and a backheating fan, an air outlet of the backheating fan is opened towards an upper cover of the belt type roasting machine, the second heat exchanger comprises a third heat exchange gas flow path and a fourth heat exchange gas flow path which exchange heat with each other, and the third heat exchange gas flow path is communicated with the second heat exchange gas flow path; a flue gas outlet of the desulfurization system is communicated with the fourth heat exchange gas flow path, a gas inlet of the selective catalytic reduction reactor is communicated with the fourth heat exchange gas flow path, and a gas inlet of the denitration exhaust fan is communicated with a gas outlet of the selective catalytic reduction reactor. The system for denitration by using the return hot air of the belt type roasting machine can reduce the consumption of coal gas.

Description

Technical Field

[0001] This application relates to the technical field of traveling grate machines, and particularly to a system for denitrifying a traveling grate machine by using recycled hot air. Background Art

[0002] Currently, the temperature increase for denitrification of a traveling grate machine is achieved by heating the flue gas with gas, which consumes a certain amount of gas and increases the flue gas volume for denitrification treatment. Additionally, when the recycled hot air heats the upper hood of the traveling grate machine, a large amount of cold air needs to be mixed in to adjust its temperature, increasing the oxygen content in the flue gas. During subsequent desulfurization and denitrification processes, the consumption of desulfurization and denitrification agents is relatively large, resulting in high production costs. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a system for denitrifying a traveling grate machine by using recycled hot air, which can indirectly heat the flue gas of the desulfurization system by recovering part of the heat of the recycled hot air of the traveling grate machine, thereby reducing the consumption of gas. Moreover, it can consume the heat of the recycled hot air of the traveling grate machine, thereby reducing the amount of cold air that needs to be mixed in, and further reducing the oxygen content in the flue gas during subsequent desulfurization and denitrification processes, and thus reducing the consumption of desulfurization and denitrification agents.

[0004] The system for denitrifying a traveling grate machine by using recycled hot air according to an embodiment of the present application includes: a reheating fan; a first heat exchanger, where the first heat exchanger includes a first heat exchange gas flow path and a second heat exchange gas flow path that exchange heat with each other. The first heat exchange gas flow path is connected between the air box of the traveling grate machine and the reheating fan, and the air outlet of the reheating fan faces the upper hood of the traveling grate machine and is open; a second heat exchanger, where the second heat exchanger includes a third heat exchange gas flow path and a fourth heat exchange gas flow path that exchange heat with each other, and the third heat exchange gas flow path is connected to the second heat exchange gas flow path; a desulfurization system, where the flue gas outlet of the desulfurization system is connected to the fourth heat exchange gas flow path; a selective catalytic reduction reactor, where the inlet of the selective catalytic reduction reactor is connected to the fourth heat exchange gas flow path; and a denitrification exhaust fan, where the inlet of the denitrification exhaust fan is connected to the outlet of the selective catalytic reduction reactor.

[0005] The system for denitrification of a traveling grate stoker using recycled hot air according to an embodiment of the present application can extract high-temperature flue gas at the air box of the traveling grate stoker by using a reheating fan, and then use the high-temperature flue gas at the air box of the traveling grate stoker to heat the upper hood of the traveling grate stoker. Moreover, when the high-temperature flue gas at the air box of the traveling grate stoker passes through the first heat exchange gas flow path, it will heat the heat exchange gas in the second heat exchange gas flow path. Then, the heated heat exchange gas in the second heat exchange gas flow path can flow to the third heat exchange gas flow path to heat the flue gas from the desulfurization system in the fourth heat exchange gas flow path. In this way, part of the heat of the recycled hot air of the traveling grate stoker can be recovered to indirectly heat the flue gas of the desulfurization system, thereby reducing the consumption of gas. And the heat of the recycled hot air of the traveling grate stoker can be consumed, thereby reducing the amount of cold air to be added. Furthermore, in the subsequent desulfurization and denitrification process, the oxygen content of the flue gas is reduced, and thus the consumption of desulfurization and denitrification agents is reduced.

[0006] The system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application further includes: a circulation fan, and the circulation fan is connected between the third heat exchange gas flow path and the second heat exchange gas flow path.

[0007] In the system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application, a make-up air valve that can be selectively opened is provided between the circulation fan and the third heat exchange gas flow path.

[0008] In the system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application, an intake air valve that can be selectively opened is provided between the reheating fan and the first heat exchange gas flow path.

[0009] The system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application further includes: a flue gas heat exchanger, and the flue gas heat exchanger includes a first flue gas channel and a second flue gas channel that exchange heat with each other. The first flue gas channel is connected between the flue gas outlet of the desulfurization system and the fourth heat exchange gas flow path, and the second flue gas channel is connected between the outlet of the selective catalytic reduction reactor and the intake of the denitrification exhaust fan.

[0010] In the system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application, the circulation fan is a variable-frequency fan.

[0011] In the system for denitrification of a traveling grate stoker using recycled hot air according to some embodiments of the present application, the rotation speed of the circulation fan is proportional to the temperature of the flue gas discharged from the fourth heat exchange gas flow path.

[0012] For the system of using recycled hot air for denitration in a traveling grate stoker according to some embodiments of the present application, when the temperature of the flue gas discharged from the fourth heat exchange gas flow path is greater than the set temperature, the rotational speed of the circulation fan decreases; when the temperature of the flue gas discharged from the fourth heat exchange gas flow path is less than the set temperature, the rotational speed of the circulation fan increases.

[0013] The system of using recycled hot air for denitration in a traveling grate stoker according to some embodiments of the present application further includes: an exhaust flue, which is communicated with the air outlet of the denitration exhaust fan.

[0014] For the system of using recycled hot air for denitration in a traveling grate stoker according to some embodiments of the present application, the exhaust flue includes a chimney.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 FIG. is a schematic diagram of a system for using recycled hot air for denitration in a traveling grate stoker according to some embodiments of the present application.

[0018] Reference Numerals:

[0019] System 100 for using recycled hot air for denitration in a traveling grate stoker;

[0020] Wind box 200 of the traveling grate stoker; Upper hood 300 of the traveling grate stoker;

[0021] Regenerative air blower 10; First heat exchanger 21, second heat exchanger 22, flue gas heat exchanger 30;

[0022] Desulfurization system 40, selective catalytic reduction reactor 50; Denitration exhaust fan 60;

[0023] Circulation fan 70; Intake valve 81; Make-up air valve 82; Chimney 90. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to better understand the technical solutions provided in the embodiments of the present specification, the technical solutions in the embodiments of the present specification will be described in detail below through the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present specification and the embodiments are detailed descriptions of the technical solutions in the embodiments of the present specification, rather than limitations on the technical solutions of the present specification. Without conflict, the technical features in the embodiments of the present specification and the embodiments can be combined with each other.

[0025] In this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element. The term "more than two" includes two or more than two cases.

[0026] The following combines the appended Figure 1 Describe the system 100 for denitrification using recycled hot air of a traveling grate stoker according to some embodiments of the present application.

[0027] As Figure 1 shown, the system 100 for denitrification using recycled hot air of a traveling grate stoker according to an embodiment of the present application includes: a regenerative air blower 10, a first heat exchanger 21, a second heat exchanger 22, a desulfurization system 40, a selective catalytic reduction reactor 50, and a denitrification exhaust fan 60.

[0028] The first heat exchanger 21 includes a first heat exchange gas flow path and a second heat exchange gas flow path that exchange heat with each other. The first heat exchange gas flow path is connected between the air box 200 of the traveling grate stoker and the regenerative air blower 10, and the air outlet of the regenerative air blower 10 faces the upper hood 300 of the traveling grate stoker and is open. The second heat exchanger 22 includes a third heat exchange gas flow path and a fourth heat exchange gas flow path that exchange heat with each other. The third heat exchange gas flow path is connected to the second heat exchange gas flow path. The flue gas outlet of the desulfurization system 40 is connected to the fourth heat exchange gas flow path. The inlet of the selective catalytic reduction reactor 50 is connected to the fourth heat exchange gas flow path. The inlet of the denitrification exhaust fan 60 is connected to the outlet of the selective catalytic reduction reactor 50.

[0029] It can be understood that the selective catalytic reduction reactor 50 can be an SCR reactor. The SCR reactor is an environmental protection device that uses selective catalytic reduction technology (SCR technology) to reduce nitrogen oxide (NOx) emissions. It is mainly used for large fixed source emission control, such as power station boilers, industrial boilers, waste incinerators, etc., and is also used for diesel vehicle exhaust treatment.

[0030] During actual use, the regenerative air blower 10 is used to extract the high-temperature flue gas at the air box 200 of the traveling grate stoker, and then the high-temperature flue gas at the air box 200 of the traveling grate stoker is used to heat the upper hood 300 of the traveling grate stoker. Moreover, when the high-temperature flue gas at the air box 200 of the traveling grate stoker passes through the first heat exchange gas flow path, it will heat the heat exchange gas in the second heat exchange gas flow path, and then the heat exchange gas in the second heat exchange gas flow path after being heated can flow to the third heat exchange gas flow path to heat the flue gas from the desulfurization system 40 in the fourth heat exchange gas flow path.

[0031] For the system 100 for denitrification using regenerative hot air of the traveling grate stoker according to the embodiment of the present application, the regenerative air blower 10 can be used to extract the high-temperature flue gas at the air box 200 of the traveling grate stoker, and then the high-temperature flue gas at the air box 200 of the traveling grate stoker is used to heat the upper hood 300 of the traveling grate stoker. Moreover, when the high-temperature flue gas at the air box 200 of the traveling grate stoker passes through the first heat exchange gas flow path, it will heat the heat exchange gas in the second heat exchange gas flow path, and then the heat exchange gas in the second heat exchange gas flow path after being heated can flow to the third heat exchange gas flow path to heat the flue gas from the desulfurization system 40 in the fourth heat exchange gas flow path. In this way, part of the heat of the regenerative hot air of the traveling grate stoker can be recovered to indirectly heat the flue gas of the desulfurization system 40, thereby reducing the consumption of gas, and the heat of the regenerative hot air of the traveling grate stoker can be consumed, thereby reducing the amount of cold air to be added, and further reducing the oxygen content in the flue gas during the subsequent desulfurization process, and further reducing the consumption of desulfurization and denitrification agents.

[0032] In some embodiments, as Figure 1 shown, the system 100 for denitrification using regenerative hot air of the traveling grate stoker further includes: a circulation fan 70, and the circulation fan 70 is connected between the third heat exchange gas flow path and the second heat exchange gas flow path. In this way, the circulation fan 70 can be used to pump the heat-exchanged gas in the second heat exchange gas flow path into the third heat exchange gas flow path, so that the heat exchange gas in the second heat exchange gas flow path after being heated can flow to the third heat exchange gas flow path to heat the flue gas from the desulfurization system 40 in the fourth heat exchange gas flow path.

[0033] In some embodiments, as Figure 1 shown, a make-up air valve 82 that can be selectively opened is provided between the circulation fan 70 and the third heat exchange gas flow path. In this way, it is convenient to open the make-up air valve 82 to supplement the amount of gas entering the third heat exchange gas flow path, and it is beneficial to open the make-up air valve 82 to realize the startup of the circulation fan 70.

[0034] In some embodiments, as Figure 1As shown, an intake valve 81 that can be selectively opened is provided between the regenerative air blower 10 and the first heat exchange gas flow path. In this way, it is convenient to open the intake valve 81 to mix the outside cold air with the flue gas discharged from the first heat exchange gas flow path, thereby reducing the temperature of the flue gas discharged from the first heat exchange gas flow path, and thus avoiding overheating of the upper hood 300 of the belt grate due to the excessive temperature of the flue gas discharged from the first heat exchange gas flow path.

[0035] In some embodiments, as Figure 1 shown, the system 100 for denitrifying the belt grate using regenerated hot air further includes: a flue gas heat exchanger 30, the flue gas heat exchanger 30 includes a first flue gas channel and a second flue gas channel that exchange heat with each other, the first flue gas channel is connected between the flue gas outlet of the desulfurization system 40 and the fourth heat exchange gas flow path, and the second flue gas channel is connected between the outlet of the selective catalytic reduction reactor 50 and the inlet of the denitrification exhaust fan 60.

[0036] In some embodiments, the circulation fan 70 is a variable frequency fan. In this way, it is convenient to control the rotation speed of the circulation fan 70 according to needs, thereby realizing the control of the movement speed of the air flow.

[0037] In some embodiments, the rotation speed of the circulation fan 70 is proportional to the temperature of the flue gas discharged from the fourth heat exchange gas flow path.

[0038] It can be understood that the higher the rotation speed of the circulation fan 70, the higher the gas delivery efficiency of the circulation fan 70. In this way, within a certain period of time, the higher the rotation speed of the circulation fan 70, the greater the amount of flue gas that the circulation fan 70 pumps the flue gas in the second heat exchange gas flow path into the third heat exchange gas flow path. That is to say, the greater the heat value of the flue gas in the third heat exchange gas flow path. Since the flue gas discharged from the first flue gas channel needs to enter the fourth heat exchange gas flow path to exchange heat with the air in the third heat exchange gas flow path, therefore, when the heat value of the flue gas in the third heat exchange gas flow path is greater, the temperature of the flue gas discharged from the fourth heat exchange gas flow path is higher.

[0039] On the contrary, within a certain period of time, the lower the rotation speed of the circulation fan 70, the smaller the amount of flue gas that the circulation fan 70 pumps the flue gas in the second heat exchange gas flow path into the third heat exchange gas flow path. That is to say, the smaller the heat value of the flue gas in the third heat exchange gas flow path. Since the flue gas discharged from the first flue gas channel needs to enter the fourth heat exchange gas flow path to exchange heat with the air in the third heat exchange gas flow path, therefore, when the heat value of the flue gas in the third heat exchange gas flow path is smaller, the temperature of the flue gas discharged from the fourth heat exchange gas flow path is lower. In this way, it is convenient to realize the positive control of the temperature of the flue gas discharged from the fourth heat exchange gas flow path by controlling the rotation speed of the circulation fan 70.

[0040] In some embodiments, the system 100 for denitrifying with recycled hot air in a traveling grate machine further includes: an exhaust gas passage, which is communicated with the outlet of the denitrification exhaust fan 60.

[0041] In this way, the exhaust gas passage can be used to discharge the gas discharged from the outlet of the denitrification exhaust fan 60 towards a designated area, thereby facilitating fixed-point discharge.

[0042] In some embodiments, the exhaust gas passage includes a chimney 90. In this way, it is convenient to use the existing chimney 90 for better exhaust, and the structure of the chimney 90 is relatively simple, which is conducive to reducing the exhaust cost.

[0043] The following combines the attached Figure 1 Describe the specific implementation manners of some embodiments of the present application:

[0044] The system 100 for denitrifying with recycled hot air in a traveling grate machine includes: a regenerative air blower 10, a first heat exchanger 21, a second heat exchanger 22, a desulfurization system 40, a selective catalytic reduction reactor 50, a flue gas heat exchanger 30, an intake valve 81, a makeup air valve 82, a denitrification exhaust fan 60, and a chimney 90.

[0045] The specific usage process is as follows: The regenerative air blower 10 extracts the flue gas at about 450 °C from the air box 200 of the traveling grate machine. This flue gas is first cooled to about 385 °C by the first heat exchanger 21, and then a certain amount of air is added to reduce the temperature to about 360 °C. The circulating air blower 70 sends the air at about 340 °C after heat exchange by the first heat exchanger 21 to the second heat exchanger 22, raising the temperature of the flue gas of the desulfurization system 40 heated by the flue gas heat exchanger 30 from 204 °C to about 220 °C to meet the temperature requirements of the SCR reactor. The flue gas after passing through the SCR reactor is heat-exchanged by the flue gas heat exchanger 30 and then sent into the flue gas and discharged into the atmosphere through the denitrification exhaust fan.

[0046] In some implementation manners, a first heat exchanger 21 is provided between the air box 200 of the traveling grate machine and the regenerative air blower 10, and the first heat exchanger 21 is a gas-gas heat exchanger. A second heat exchanger 22 is provided between the flue gas heat exchanger 30 and the SCR reactor, and the second heat exchanger 22 is a gas-gas heat exchanger. The air circulation between the first heat exchanger 21 and the second heat exchanger 22 is driven by the circulating air blower 70, and the circulating air blower 70 adopts variable frequency speed regulation. The rotation speed of the circulating air blower 70 is proportional to the temperature of the flue gas after the flue gas heat exchanger 30 heated by the second heat exchanger 22 to ensure that the flue gas temperature meets the requirements. When the flue gas temperature is higher than the set temperature, the speed decreases, and when the flue gas temperature is lower than the set temperature, the speed increases. A makeup air valve 82 is provided at the inlet of the circulating air blower 70 for use during startup and makeup air.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0048] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0049] In the present invention, unless otherwise clearly defined and limited, the terms such as "mounted", "connected", "coupled", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0051] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0052] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A system (100) for denitrification of a traveling grate sinter machine using recycled hot air, characterized in that, Comprising: Regenerative air blower (10); First heat exchanger (21), the first heat exchanger (21) includes a first heat exchange gas flow path and a second heat exchange gas flow path that exchange heat with each other, the first heat exchange gas flow path is connected between the air box (200) of the belt grate and the regenerative air blower (10), and the air outlet of the regenerative air blower (10) faces the upper hood (300) of the belt grate and is open; Second heat exchanger (22), the second heat exchanger (22) includes a third heat exchange gas flow path and a fourth heat exchange gas flow path that exchange heat with each other, the third heat exchange gas flow path is connected to the second heat exchange gas flow path; Desulfurization system (40), the flue gas outlet of the desulfurization system (40) is connected to the fourth heat exchange gas flow path; Selective catalytic reduction reactor (50), the inlet of the selective catalytic reduction reactor (50) is connected to the fourth heat exchange gas flow path; Denitration exhaust fan (60), the inlet of the denitration exhaust fan (60) is connected to the outlet of the selective catalytic reduction reactor (50).

2. The system (100) for denitrification by using recycled hot air in a traveling grate machine according to claim 1, wherein, Further comprising: Circulation fan (70), the circulation fan (70) is connected between the third heat exchange gas flow path and the second heat exchange gas flow path.

3. The system (100) for denitrification by using recycled hot air of a traveling grate machine according to claim 2, wherein, A make-up air valve (82) that can be selectively opened is provided between the circulation fan (70) and the third heat exchange gas flow path.

4. The system (100) for denitration of a belt grate using regenerated hot air according to claim 1, characterized in that An intake valve (81) that can be selectively opened is provided between the regenerative air blower (10) and the first heat exchange gas flow path.

5. The system (100) for denitrification by using recycled hot air in a traveling grate machine according to claim 2, wherein, Further comprising: Flue gas heat exchanger (30), the flue gas heat exchanger (30) includes a first flue gas channel and a second flue gas channel that exchange heat with each other, the first flue gas channel is connected between the flue gas outlet of the desulfurization system (40) and the fourth heat exchange gas flow path, and the second flue gas channel is connected between the outlet of the selective catalytic reduction reactor (50) and the inlet of the denitration exhaust fan (60).

6. The system (100) for denitrification of a traveling grate sintering machine using recycled hot air according to claim 5, characterized in that, The circulation fan (70) is a variable frequency fan.

7. The system (100) for denitrification by using recycled hot air in a traveling grate machine according to claim 6, wherein, The rotation speed of the circulation fan (70) is proportional to the temperature of the flue gas discharged from the fourth heat exchange gas flow path.

8. The system (100) for denitrification by using recycled hot air in a traveling grate machine according to claim 7, characterized in that, When the temperature of the flue gas discharged from the fourth heat exchange gas flow path is greater than the set temperature, the rotation speed of the circulation fan (70) decreases; When the temperature of the flue gas discharged from the fourth heat exchange gas flow path is less than the set temperature, the rotation speed of the circulation fan (70) increases.

9. The system (100) for denitrification by using recycled hot air in a traveling grate stoker according to any one of claims 1-8, characterized in that, Further comprising: Smoke exhaust channel, the smoke exhaust channel is connected to the outlet of the denitration exhaust fan (60).

10. The system (100) for denitrification of a traveling grate stoker using recycled hot air according to claim 9, characterized in that, The smoke exhaust channel includes a chimney (90).

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