A gasifier stirring device and method of use thereof

Abstract

This invention relates to the field of biomass utilization equipment technology, and in particular to a gasifier stirring device and its usage method. The device includes a furnace body assembly, a stirring assembly, and a material distribution assembly. The furnace body assembly includes a gasifier and a feeding component. The stirring assembly includes a driving component and a rotating component. The material distribution assembly includes an opening and closing component, a vibrating screen component, and a force sensor. By setting up the gasifier and feeding component, a combustion environment is provided for straw combustion. By setting up the driving and rotating components, the stirring effect of the straw material inside the furnace body is achieved, solving the problem of incomplete combustion. By setting up the opening and closing component, the vibrating screen component, and the force sensor, the amount of straw material added is quantitatively and precisely controlled, avoiding the problem of inconsistent combustion levels in different areas of the furnace body assembly due to uncontrolled material addition, which leads to incomplete combustion.

Description

Technical Field

[0001] This invention relates to the field of biomass utilization equipment technology, and in particular to a gasifier stirring device and its usage method. Background Technology

[0002] Straw-fired stove components are environmentally friendly and energy-saving devices that utilize crop straw and other biomass resources, converting them into combustible gas through gasification technology. Widely used in rural areas, they are considered a sustainable new energy solution due to their advantages such as being renewable, low-cost, and abundant in resources. During operation, the fuel inside the stove needs to be stirred to promote complete combustion, thereby improving energy utilization efficiency.

[0003] However, existing straw furnace components suffer from incomplete combustion of materials during use. One major reason for this is the lack of stirring during combustion. When stirring, the amount of material varies in different areas due to the turbulence of the material. Adding new material to the combustion process further widens the gap in material quantity between different areas, ultimately resulting in incomplete combustion of straw and reduced material utilization. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the technical problem to be solved by the present invention is that straw materials lacking stirring will result in incomplete combustion. When stirring is used to enhance the combustion efficiency of straw, the amount of material added is not controlled, which will lead to inconsistent straw combustion in different areas of the furnace body components, resulting in incomplete combustion.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a gasifier stirring device, comprising a furnace body assembly, wherein the furnace body assembly comprises a gasifier and a feeding component, and the feeding component is connected through to the upper part of the gasifier;

[0007] A stirring assembly, disposed on one side of the gasifier, includes a driving component and a rotating component. The driving component is disposed outside the gasifier, and the rotating component is disposed inside the gasifier and connected to the driving component; and...

[0008] The material feeding assembly is located inside the furnace body assembly and includes an opening and closing component, a vibrating screen component, and a force sensor. The opening and closing component is connected to the lower part of the feeding component. The vibrating screen component is located away from the opening and closing component and connected to one end of the driving component. The force sensor is located outside the gasifier and its sensing end cooperates with the vibrating screen component.

[0009] In a preferred embodiment of the gasifier stirring device of the present invention, the vibrating screen includes a hinge block, a hinge rod, a spring, and a grate. The hinge block is connected to the driving component. One end of the hinge rod is hinged to the hinge block, and the other end is connected to one end of the spring through a hinge pin. The other end of the spring is connected to the grate, which is disposed inside the gasifier, with the driving component passing through its middle portion.

[0010] In a preferred embodiment of the gasifier stirring device of the present invention, the rotating component includes a sleeve block, connecting rods and dispersing blades. The sleeve block has a through-hole and cooperates with the driving component. A plurality of connecting rods are connected in a cross shape to the four side walls of the sleeve block. A plurality of dispersing blades are rotatably connected to the rod body of the connecting rods.

[0011] In a preferred embodiment of the gasifier stirring device of the present invention, the driving component includes a support frame, a threaded rod, a limiting ring, and a motor. The support frame is connected to the outside of the gasifier. The motor is installed outside the gasifier through its connection with the support frame. The threaded rod is coaxially disposed inside the gasifier and connected to the output end of the motor. Its rod body also cooperates with a sleeve block. The limiting ring is disposed on the rod body of the threaded rod and cooperates with the sleeve block.

[0012] As a preferred embodiment of the gasifier stirring device of the present invention, the opening and closing component includes a second hopper, a discharge port, a material gate, and an opening rod. The feeding port of the second hopper is matched with the discharge port of the feeding component. The number and position of the discharge port correspond to the number and position of the combustion zones divided in the gasifier. Several material gates are respectively hinged to the discharge port and simultaneously hinged to the lower end of the opening rod.

[0013] In a preferred embodiment of the gasifier stirring device of the present invention, the feeding component includes a first hopper, a partition plate and a chute. The first hopper is connected to the upper wall of the gasifier, the chute is opened through the side wall of the first hopper, and the partition plate is movably inserted into the interior of the chute.

[0014] In a preferred embodiment of the gasifier stirring device of the present invention, the partition includes an upper partition and a lower partition, and the chute includes an upper chute and a lower chute. The upper partition is inserted into the upper chute, and the lower partition is inserted into the lower chute.

[0015] As a preferred embodiment of the gasifier stirring device of the present invention, the gasifier includes a slag inlet and a support leg, the support leg is connected to the bottom perimeter of the gasifier, and the slag inlet is disposed through the bottom side wall of the gasifier.

[0016] As a preferred embodiment of the gasifier stirring device of the present invention, the internal space of the gasifier is a cylindrical cavity, and a limiting groove is vertically provided on its inner side wall, and a plurality of the limiting grooves are limited to one end of the connecting rod.

[0017] Another object of the present invention is to provide a method for using a gasifier stirring device, which includes the following steps:

[0018] The interior of the gasifier is divided into multiple combustion zones in a disc shape, and the multiple discharge ports of the opening and closing parts are arranged to correspond to the multiple combustion zones.

[0019] The resistance value of the spring in different combustion zones is monitored by a force sensor. It is determined whether the resistance value meets the first preset condition. If it does, the discharge port of the corresponding combustion zone is opened; otherwise, it is not opened.

[0020] Determine whether the duration of the resistance value meets the second preset condition. If yes, open the discharge port of the corresponding combustion zone; otherwise, do not open it.

[0021] The beneficial effects of this invention are as follows: By setting up a gasifier and a feeding component, a combustion environment is provided for straw combustion; by setting up a driving component and a rotating component, the straw material inside the furnace body is stirred, solving the problem of incomplete combustion; by setting up an opening and closing component, a vibrating screen component, and a force sensor, the amount of straw material added is quantitatively and precisely controlled, avoiding the problem that the degree of straw combustion in different areas of the furnace body components is inconsistent due to uncontrolled addition of material, resulting in incomplete combustion. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the gasifier stirring device of the present invention.

[0024] Figure 2 This is a partial cross-sectional schematic diagram of the gasifier stirring device of the present invention.

[0025] Figure 3 This is a schematic diagram of the stirring assembly of the present invention.

[0026] Figure 4 This is a schematic diagram of the rotating component of the present invention.

[0027] Figure 5 This is a schematic diagram of the feeding component of the present invention.

[0028] Figure 6 This is a schematic diagram of the opening and closing mechanism of the present invention.

[0029] Figure 7 This is a schematic flowchart of the furnace body component stirring method of the present invention. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive, either alone or selectively, with other embodiments.

[0033] Example 1

[0034] Reference Figure 1 - Figure 2 This is the first embodiment of the present invention, which provides a gasifier stirring device, including a furnace body assembly 100, a stirring assembly 200, and a material distribution assembly 300. The operator puts straw material into the furnace body assembly 100. During combustion, the stirring assembly 200 stirs the material to ensure complete combustion. Then, the material distribution assembly 300 adds material to different combustion zones to maintain a uniform degree of combustion in each zone. This solves the problem of incomplete combustion of straw material due to lack of stirring. However, when stirring to enhance the combustion efficiency of straw, the amount of material added is not controlled, which can lead to inconsistent degree of combustion of straw in different zones of the furnace body assembly, resulting in incomplete combustion.

[0035] Specifically, the furnace body assembly 100 includes a gasifier 101 and a feeder 102, wherein the feeder 102 is connected through to the side wall of the gasifier 101.

[0036] Furthermore, the stirring assembly 200 includes a driving member 201 and a rotating member 202, wherein the two ends of the driving member 201 are respectively disposed outside and inside the gasifier 101, while the rotating member 202 is connected to the driving member 201 inside the gasifier 101.

[0037] Furthermore, the fabric assembly 300 includes an opening and closing member 301, a vibrating screen member 302, and a force sensor 303. The opening and closing member 301 is located at the lower part of the feeding member 102, while the vibrating screen member 302 is located away from the opening and closing member 301 and connected to the lower end of the driving member 201. The sensing end of the force sensor 303 cooperates with the vibrating screen member 302.

[0038] Preferably, the force sensor 303 is installed outside the gasifier 101. Compared with the related technology where the monitoring component is installed inside the gasifier 101, this avoids the force sensor 303 being installed inside the high-temperature and high-dust gasifier 101, thereby improving the accuracy of the monitoring data and the service life of the force sensor 303.

[0039] During use, the operator feeds the straw material into the gasifier 101 through the feeder 102. During this process, the feed rate is effectively adjusted by controlling the opening and closing component 301. Then, the drive component 201 is started, which drives the rotating component 202 to stir the burning material and make it burn completely. The movement of the rotating component 202 causes the vibrating screen component 302 to be polarized, so that the burned material is vibrated and leaks out of the gasifier 101 through the vibrating screen component 302.

[0040] In summary, by setting up a gasifier to provide combustion space for straw, by setting up feeding and opening / closing components to control the amount of material fed, by setting up driving and rotating components to stir the burning material, and by setting up a vibrating screen to shake off the burnt ash from the gasifier, the problem of incomplete combustion of straw due to lack of stirring is finally solved. However, when stirring to enhance the combustion efficiency of straw, the amount of material added is not controlled, which can lead to uneven combustion of straw in different areas of the furnace components, resulting in incomplete combustion.

[0041] Example 2

[0042] Reference Figure 3 - Figure 6 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0043] Specifically, the vibrating screen component 302 includes a hinge block 302a, a hinge rod 302b, a spring 302c, and a grate 302d. The hinge block 302a is fixed and coaxially connected to the body of the threaded rod 201b. One end of the hinge rod 302b is hinged to the hinge block 302a, and the other end is connected to one end of the spring 302c through a hinge joint. The other end of the spring 302c is connected to the grate 302d.

[0044] Preferably, in this embodiment, the hinge block 302a is a rectangular block, with four hinge rods 302b hinged to its four vertical sidewalls. The number of springs 302c corresponds to the number of hinge rods 302b, which respectively suspend the grate 302d at 90°. The grate 302d is a circular plate with a diameter equal to the inner diameter of the gasifier 101. Several fine holes are opened through the surface of the grate 302d to filter out the straw ash after combustion.

[0045] Furthermore, the drive component 201 includes a support frame 201a, a threaded rod 201b, a limiting ring 201c, and a motor 201d. The support frame 201a is disposed outside the gasifier 101, while the motor 201d is mounted on the support frame 201a. One end of the threaded rod 201b is connected to the output end of the motor 201d, and the other end passes through the grate 302d and is coaxially and vertically disposed in the gasifier 101. The limiting ring 201c is integrally disposed on the rod body of the threaded rod 201b.

[0046] Preferably, the motor 201d is an ND-30 reversible motor, used to realize the up-and-down reciprocating motion of the sleeve block 202a.

[0047] Furthermore, the rotating component 202 includes a sleeve block 202a, a connecting rod 202b, and a dispersing blade 202c. The sleeve block 202a has a screw hole inside and cooperates with the threaded rod 201b. The sleeve block 202a is rectangular and has four cylindrical connecting rods 202b arranged in a cross around it. The dispersing blade 202c is rotatably sleeved on the rod body of the connecting rod 202b.

[0048] Preferably, the sleeve 202a is limited to move on the threaded rod 201b between the limiting ring 201c and the hinge block 302a, and the threaded rod 201b is provided with threads that cooperate with the sleeve 202a in this area.

[0049] Furthermore, the opening and closing component 301 includes a second hopper 301a, a discharge port 301b, a material gate 301c, and an opening rod 301d. The opening rod 301d extends in the vertical direction, with its upper end extending out of the furnace body assembly 101. The lower end of the opening rod 301d is hinged to the material gate 301c. The opening rod 301d is movable in the vertical direction. The material gate 301c is hinged to the discharge port 301b. When the opening rod 301d moves upward, the material gate 301c can be opened. When the opening rod 301d moves downward, the material gate 301c can be closed.

[0050] Preferably, a cam mechanism can be provided at the upper end of the opening rod 301d. The number of cam mechanisms is the same as the number of discharge ports 301b, the number of opening rods 301d is the same as the number of discharge ports 301b, and multiple cam mechanisms correspond one-to-one with multiple opening rods 301d.

[0051] Furthermore, the feed component 102 includes a first hopper 102a, a partition 102b, and a chute 102c. The first hopper 102a is located outside the gasifier 101 and is connected through the side wall of the gasifier 101. The chute 102c is disposed through the side wall of the first hopper 102a, and the partition 102b is inserted into the chute 102c.

[0052] Preferably, the partition 102b is provided with an upper partition 102b-1 and a lower partition 102b-2. Correspondingly, the chute 102c is also provided with an upper chute 102c-1 and a lower chute 102c-2, which are respectively inserted and cooperated with the partition 102b. When it is necessary to add material to the furnace body, the partition 102b is pulled to add fuel and let it fall on the top surface of the upper partition 102b-1. When it is necessary to discharge material, the upper partition 102b-1 is pulled to let the fuel fall on the top surface of the lower partition 102b-2. At this time, the upper partition 102b-1 is pushed back to its original position to block the fuel. When it is necessary to add material, the lower partition 102b-2 is pulled to let the fuel on its top surface fall into the furnace body. This can achieve the effect of quantitative material discharge.

[0053] Furthermore, the gasifier 101 includes a slag inlet 101a, a support leg 101b, and a limiting groove 101c. The support leg 101b is connected to the bottom perimeter of the gasifier 101, while the slag inlet 101a is disposed through the bottom side wall of the gasifier 101 to discharge the burnt slag. Meanwhile, the internal space of the gasifier 101 is a cylindrical cavity, and the inner side wall is vertically provided with a limiting groove 101c, which is matched with the end of the connecting rod 202b for limiting.

[0054] Preferably, a combustion chamber is installed on the top of the gasifier 101, and the combustion chamber is connected to a flame pipe. The combustion chamber can be used to assist the combustion of fuel and improve the combustion efficiency of fuel.

[0055] In operation, the operator feeds straw into hopper 102a and controls the amount of material fed each time by adjusting the baffle 102b. When it is necessary to agitate the fuel inside the furnace, the motor 201d is started, causing the threaded rod 201b fixedly installed at its output end to rotate. Because the connecting rod 202b slides against the limiting groove 101c on the inner wall of the furnace, the screw block 202a on its outer wall moves up and down as the threaded rod 201b rotates. When fuel is added into the furnace from the discharge port 301b, it falls onto the dispersing blades 202c. The weight of the fuel causes the dispersing blades 202c to rotate, dispersing the fuel. As the sleeve block 202a moves up and down, the connecting rod 202b also moves up and down, simultaneously causing the dispersing blades 202a to rotate. c also moves up and down to better crush the fuel, achieving the effect of pre-treatment by mixing. When the threaded rod 201b rotates, the hinge block 302a fixedly installed at its bottom also rotates. When the hinge block 302a rotates, the hinge rod 302b connected to its outer wall also rotates. Since the hinge rod 302b is hinged, under the action of centrifugal force, the hinge rod 302b can deflect up and down. When the hinge rod 302b deflects and rotates, it mixes the fuel inside the furnace. This is manifested as follows: when the hinge rod 302b rotates, it drives the grate 302d connected to it to rotate. When the hinge rod 302b deflects, under the action of the spring 302c, the grate 302d slides up and down, thereby stirring and mixing the fuel inside the furnace.

[0056] In summary, by setting up a gasifier and a feeding device, a combustion environment is provided for straw combustion. By setting up a driving device and a rotating device, the straw material inside the furnace is stirred, solving the problem of incomplete combustion. By setting up an opening and closing device, a vibrating screen, and a force sensor, the amount of straw material added is quantitatively and precisely controlled, avoiding the problem of inconsistent straw combustion in different areas of the furnace components due to uncontrolled material addition, which would lead to incomplete combustion.

[0057] Example 3

[0058] Reference Figure 7 This is the third embodiment of the present invention, which provides a gasifier stirring method.

[0059] Specifically, the gasifier 101 is first divided into four equal combustion zones, and the discharge port 301b is assigned to each combustion zone.

[0060] Preferably, the gasifier 101 is divided into four combustion zones, which are distributed at 90° intervals around the circumference of the furnace body. Each combustion zone corresponds to a discharge port 301b of the opening and closing component 301.

[0061] Next, the force sensor 303 monitors the resistance value of the spring 302c in different combustion zones and determines whether the resistance value meets the first preset condition S1. If so, the discharge port 301b of the corresponding combustion zone is opened; otherwise, it is not opened.

[0062] It is worth noting that the first preset condition is P0-Pn>0, where P0 is the average resistance value of multiple springs 302c in different combustion zones, and Pn is the real-time resistance value of springs 302c in different combustion zones. For example, if the combustion zone is divided into four regions, namely Sa, Sb, Sc, and Sd, when the fuel is evenly distributed, since the springs 302c extend into the fuel to the same depth, the resistance value of springs 302c in different regions is the same. For example, if the resistance value is 5KN, then the average resistance value of multiple springs 302c in different combustion zones per unit time is 5KN. When the material in a certain region is smaller than the material in other regions, and the stirring component cannot stir the material to that region, the resistance of springs 302c in that region decreases, i.e., Pn decreases. Although P0 also decreases, the decrease in Pn is greater than that of P0. At this time, it can be determined that the material in that region needs to be filled, and the corresponding discharge port 301b can be opened.

[0063] Further, determine whether the duration of the resistance value meets the second preset condition S2. If so, open the discharge port 301b of the corresponding combustion zone.

[0064] It is worth noting that when the value of Pn drops sharply or becomes zero, it also indicates that there is a lack of material in the area. The second preset condition can be T>3, where T is the duration of the sharp drop in Pn or Pn being zero. When the duration is greater than 3 seconds, it means that the stirring component 200 cannot deliver the excess material to the area where there is a lack of material. At this time, the corresponding discharge port 301b needs to be opened to replenish the material.

[0065] In summary, this method uses a force sensor 303 to monitor the resistance value of the spring 302c to determine whether the material in the gasifier 101 is evenly distributed. Compared with related technologies that install monitoring components inside the gasifier 101, this method avoids the high-temperature and high-dust monitoring environment, thereby improving the accuracy of monitoring.

[0066] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A gasifier stirring device, characterized in that: The assembly includes a furnace body assembly (100), which includes a gasifier (101) and a feed member (102), the feed member (102) being connected through to the side wall of the gasifier (101); and a stirring assembly (200), which is disposed on one side of the gasifier (101) and includes a drive member (201) and a rotating member (202), the drive member (201) being disposed on one side of the gasifier (101) and the rotating member (202) being disposed inside the gasifier (101) and connected to the drive member (201). 01) Connected to; and, a feeding assembly (300), the feeding assembly (300) being disposed inside the furnace body assembly (100), including an opening and closing member (301), a vibrating screen member (302) and a force sensor (303), the opening and closing member (301) being connected to the lower part of the feeding member (102), the vibrating screen member (302) being located away from the opening and closing member (301) and connected to one end of the driving member (201), the force sensor (303) being disposed outside the gasifier (101), and its sensing end cooperating with the vibrating screen member (302); The vibrating screen component (302) includes a hinge block (302a), a hinge rod (302b), a spring (302c), and a grate (302d). The hinge block (302a) is connected to the drive component (201). One end of the hinge rod (302b) is hinged to the hinge block (302a), and the other end is connected to one end of the spring (302c) through a hinge pin. The other end of the spring (302c) is connected to the grate (302d), and the grate (302d) is disposed inside the gasifier (101), with its middle part passing through the drive component (201). The rotating component (202) includes a sleeve (202a), a connecting rod (202b), and a dispersing blade (202c). The sleeve (202a) has a through-hole and cooperates with the driving component (201). A plurality of connecting rods (202b) are connected in a cross shape to the four side walls of the sleeve (202a). A plurality of dispersing blades (202c) are rotatably connected to the rod body of the connecting rod (202b). The driving component (201) includes a support frame (201a), a threaded rod (201b), a limiting ring (201c), and a motor (201d). The support frame (201a) is connected to the outside of the gasifier (101). The motor (201d) is installed on the outside of the gasifier (101) through its connection with the support frame (201a). The threaded rod (201b) is coaxially disposed inside the gasifier (101) and is connected to the output end of the motor (201d). Its rod body also cooperates with the sleeve block (202a). The limiting ring (201c) is disposed on the rod body of the threaded rod (201b) and cooperates with the sleeve block (202a).

2. The gasifier stirring device as described in claim 1, characterized in that: The opening and closing component (301) includes a second hopper (301a), a discharge port (301b), a material gate (301c), and an opening rod (301d). The feeding port of the second hopper (301a) is matched with the discharge port of the feeding component (102). The number and position of the discharge ports (301b) correspond to the number and position of the combustion zones divided in the gasifier (101). Several material gates (301c) are respectively hinged to the discharge ports (301b) and simultaneously hinged to the lower end of the opening rod (301d).

3. The gasifier stirring device as described in claim 2, characterized in that: The feeding component (102) includes a first hopper (102a), a partition (102b), and a chute (102c). The first hopper (102a) is connected to the upper wall of the gasifier (101). The chute (102c) is opened through the side wall of the first hopper (102a). The partition (102b) is movably inserted inside the chute (102c).

4. The gasifier stirring device as described in claim 3, characterized in that: The partition (102b) includes an upper partition (102b-1) and a lower partition (102b-2), and the slide (102c) includes an upper slide (102c-1) and a lower slide (102c-2). The upper partition (102b-1) is inserted into the upper slide (102c-1), and the lower partition (102b-2) is inserted into the lower slide (102c-2).

5. The gasifier stirring device as described in claim 4, characterized in that: The gasifier (101) includes a slag inlet (101a) and a support leg (101b). The support leg (101b) is connected to the bottom perimeter of the gasifier (101), and the slag inlet (101a) is disposed through the bottom side wall of the gasifier (101).

6. The gasifier stirring device as described in claim 5, characterized in that: The internal space of the gasifier (101) is a cylindrical cavity, and a limiting groove (101c) is vertically provided on its inner side wall. Several of the limiting grooves (101c) are limited and engaged with one end of the connecting rod (202b).

7. A method of using a gasifier stirring device, characterized in that: The gasifier stirring device according to any one of claims 1-6 is adopted; and, S1: the interior of the gasifier (101) is divided into multiple combustion zones in a disc shape, and multiple discharge ports of the opening and closing member (301) are arranged corresponding to multiple combustion zones; S2: the resistance value of the spring (302c) in different combustion zones is monitored by the force sensor (303), and it is determined whether the resistance value meets the first preset condition A1. If yes, the discharge port (301b) of the corresponding combustion zone is opened; if no, it is not opened; S3: it is determined whether the duration of the resistance value meets the second preset condition A2. If yes, the discharge port (301b) of the corresponding combustion zone is opened; if no, it is not opened.

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