Flue control valve for a flue gas combustion device

Abstract

The application discloses a flue control valve for a flue gas combustion device. The valve seat of the flue control valve forms a valve seat sealing surface, and the valve core assembly forms a valve core sealing surface; the valve seat sealing surface comprises a first seat sealing surface and a second seat sealing surface; the valve core sealing surface comprises a first core sealing surface and a second core sealing surface; the first core sealing surface is provided with an elastic metal sealing ring; when the flue control valve is closed, the elastic metal sealing ring periphery is in abutting fit with the first seat sealing surface; the second seat sealing surface corresponds to the second core sealing surface, and a convex strip extends into a groove; the groove is communicated with a source of pressure fluid. By using the flue control valve, the relative position of the valve seat and the valve core assembly can be defined by the elastic metal sealing ring, and a multiple sealing fluid seal is formed, and the impact of the pressure fluid can realize the'self-cleaning' effect of the sealing fit surface. The flue control valve can meet the needs of the flue gas combustion device, ensure the sealing effect of the flue gas passage, and has a long service life and high reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial flue gas treatment, in particular to a flue control valve for a flue gas combustion device. BACKGROUND

[0002] The flue gas discharged by combustion furnaces (sintering furnaces, shaft furnaces, rotary kilns and blast furnaces) contains harmful pollutants such as dust, NO X , SOx, CO, VOCs, dioxins and the like. In order to reduce harmful pollutants in flue gas, it is generally necessary to purify the flue gas.

[0003] The flue gas purification process generally includes dust removal, desulfurization, denitrification, and then emptying, so that the nitrogen and sulfur can be removed before emptying, achieving the purification of flue gas. Among them, volatile organic compounds (VOCs) and dioxins often enter the absorption slurry during the desulfurization and denitrification processes, becoming components of the absorption slurry. During the filtration process of the absorption slurry, harmful substances formed by VOCs and dioxins will remain in the filter cake, which will make the filter cake difficult to handle, and thus become an important obstacle to the utilization of filter cake. In the prior art, the absorption slurry is either specially treated or the filter cake is specially treated, which results in complex process and increased cost.

[0004] In order to improve the flue gas purification effect, reduce the adverse effects of harmful pollutants, reduce the flue gas purification treatment cost, and reduce the flue gas purification energy consumption, the flue gas purification systems disclosed in Chinese patent documents CN113295013A and CN113251813A are provided with a flue gas combustion device, so that the flue gas to be purified is burned (spontaneous combustion or added with combustion-supporting substances for incineration) when passing through the flue gas combustion device, and is converted into harmless components, achieving the purpose of removing pollutants in the flue gas to be treated.

[0005] In order to make the flue gas to be treated fully burn in the flue gas combustion device, it is necessary to control the entry of the flue gas to be treated, and at the same time control the discharge of the flue gas after combustion, so as to avoid short circuiting between the channel for introducing the flue gas to be treated and the channel for discharging the flue gas after combustion (if the content of pollutants in the flue gas to be treated is 45000 Nm3 / hr, and 0.1% of the pollutants enter the channel for discharging the flue gas after combustion, it will cause the flue gas discharged or entering the next process to be seriously over-standard; and the corresponding legal responsibility will be borne). Therefore, the flue control valve needs to have a high sealing effect when closed.

[0006] At the same time, because the flue control valve is located in a harsh working environment of high temperature, high corrosion and high dust, and needs to be switched between closed and open states at a high frequency, the flue control valve needs to have high adaptability, and the ordinary control valve structure cannot meet the needs of flue gas control.

[0007] On the basis of in-depth research and experiments, the patent applicant obtains a technology for ensuring sealing by forming a fluid sealing annular groove between sealing surfaces (see Chinese patent document CN115163855A). Although the sealing surface combined with the fluid sealing annular groove can ensure the sealing effect of the flue control valve, since the flue control valve is located in a high-temperature, high-corrosion, and high-smoke-dust working environment, the flue control valve sealing surface fitting is prone to deformation, resulting in unsatisfactory reliability and service life of the flue control valve.

[0008] Therefore, how to ensure the sealing effect and the adaptability of the flue control valve while improving the service life and reliability of the flue control valve has become a problem to be solved. SUMMARY

[0009] The purpose of the present application is to provide a flue control valve for a flue gas combustion device, which can meet the needs of the flue gas combustion device, ensure the sealing effect of the flue gas passage, and also has a longer service life and higher reliability.

[0010] The flue control valve for the flue gas combustion device comprises a valve seat and a valve core assembly used in cooperation, the valve seat is installed in the flue gas passage and forms a valve seat sealing surface, the valve core assembly forms a valve core sealing surface; the valve seat sealing surface and the valve core sealing surface are opposite; the valve seat sealing surface comprises a first seat sealing surface and a second seat sealing surface; the valve core sealing surface comprises a first core sealing surface and a second core sealing surface; the first core sealing surface is provided with an elastic metal sealing ring with a periphery extending outward; the second seat sealing surface is provided with an annular protrusion or an annular groove, and the second core sealing surface is provided with an annular groove and an annular protrusion; when the flue control valve is closed, the first core sealing surface corresponds to the first seat sealing surface, and the periphery of the elastic metal sealing ring is in abutting cooperation with the first seat sealing surface; the second seat sealing surface corresponds to the second core sealing surface, and the protrusion extends into the groove; the groove is communicated with a source of pressurized fluid. By abutting the periphery of the elastic metal sealing ring with the first seat sealing surface, the relative position of the valve seat and the valve core assembly can be limited, the "hard contact" between the valve seat and the valve core assembly can be avoided, and the "soft cooperation" of the two can be realized; meanwhile, the cooperation of the periphery of the elastic metal sealing ring with the first seat sealing surface can realize the first sealing of the cooperation surface: the contact sealing. Meanwhile, in the second seat sealing surface and the second core sealing surface, the protrusion extends into the groove, thereby increasing the leakage flow path of the flue gas through the gap, increasing the difficulty of flue gas leakage, and forming the second sealing of the flue gas: the labyrinth sealing. In addition, the groove is communicated with the source of pressurized fluid, and the pressurized fluid can be filled into the groove when the flue control valve is closed. The pressurized fluid can form an obstacle to the leaked flue gas on one hand, and can impact the leaked flue gas in the opposite direction on the other hand, thereby forming the third sealing of the flue gas: the fluid sealing. In addition, the impact of the pressurized fluid can produce a sweeping effect, thereby realizing the "self-cleaning" effect of the sealing cooperation surface, reducing the corrosion and damage of the sealing cooperation surface caused by high temperature flue gas, and thereby improving the reliability and prolonging the service life of the flue control valve. Through the "soft cooperation" between the periphery of the elastic metal sealing ring and the first seat sealing surface, the impact or collision of the sealing cooperation surface, the protrusion or the groove caused by the closing or opening operation can be avoided, and the reliability and adaptability of the sealing cooperation surface can be improved. Furthermore, the flue control valve can meet the needs of the flue gas combustion device, ensure the sealing effect of the flue gas passage, and has a long service life and high reliability.

[0011] In the preferred technical solution, in the corresponding protrusion and groove, the top of the protrusion and the bottom of the groove form a labyrinth sealing cooperation; at least three labyrinth sealing cooperations are formed between the second seat sealing surface and the second core sealing surface. The appropriate labyrinth sealing cooperation can improve the sealing effect.

[0012] Further technical solutions, the flue control valve further comprises a fluid source groove formed in the second seat sealing surface or / and the second core sealing surface; the fluid source groove is communicated with the source of fluid under pressure; the groove is communicated with the source of fluid under pressure through the fluid source groove. The fluid source groove can form a pressure storage cavity between the sealing surfaces, which can maintain the external fluid pressure and reduce the flue gas leakage, and can also maintain or improve the uniformity of the fluid pressure in the circumferential direction of the groove, thereby improving the reliability of the labyrinth seal.

[0013] In the preferred technical solutions, the cross-sectional area of the fluid source groove is greater than the cross-sectional area of the groove, and the cross-sectional area of the fluid source groove is further 3-8 times the cross-sectional area of the groove. In this way, the circumferential uniformity of the labyrinth seal and the fluid seal can be ensured.

[0014] In the preferred technical solutions, the first seat sealing surface is an inner conical annular surface, and the first core sealing surface is provided with a plurality of elastic metal sealing rings extending outward in the circumferential direction. In this way, when the elastic metal sealing ring and the first seat sealing surface produce friction and deviation due to deposition and dimensional error, the adaptability can be maintained by using the characteristics of the inner conical annular surface.

[0015] In the further technical solutions, the outer diameter of the elastic metal sealing ring close to the valve seat is smaller than the outer diameter of the elastic metal sealing ring away from the valve seat. In this way, the contact sealing effect of each elastic metal sealing ring can be ensured, and each elastic metal sealing ring can produce effective contact sealing as much as possible, thereby improving the sealing effect.

[0016] In the further technical solutions, the rigidity of the elastic metal sealing ring close to the valve seat is smaller than the rigidity of the elastic metal sealing ring away from the valve seat. In this way, the contact impact can be reduced while ensuring the sealing effect, thereby reducing damage and improving reliability.

[0017] In the preferred technical solutions, the first seat sealing surface and the second seat sealing surface are arranged inside and outside; and the reference surface of the second seat sealing surface can be a plane. In this way, the stepped structure can be formed on the peripheral surface of the valve core assembly, thereby facilitating the processing of the sealing surfaces. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 An internal structure schematic diagram of an embodiment of the flue control valve for the flue gas combustion device is provided for the present application;

[0019] Figure 2 For Figure 1 An enlarged view of part A;

[0020] Figure 3 Is Figure 2 A principle schematic diagram of the cooperation between the valve seat and the valve core assembly;

[0021] Figure 4 IsFigure 2 The schematic diagram of the separation of the corresponding sealing surfaces of the valve seat and the valve core assembly;

[0022] Figure 5 is Figure 3 The enlarged view of part B in FIG. 1 shows the principle of forming a labyrinth seal by the corresponding sealing surfaces of the valve seat and the valve core assembly. DETAILED DESCRIPTION

[0023] The specific embodiment of the present application is described below in combination with the drawings.

[0024] It should be noted that in this document, "up", "down", "left", "right" are determined based on the corresponding drawings, and "inner" and "outer" are determined with reference to the center line C of the valve core assembly of the flue control valve.

[0025] Please refer to Figure 1 , Figure 1 The internal structure schematic diagram of the flue control valve embodiment for the flue gas combustion device provided by the present application is shown. Figure 1 Two flue control valves arranged left and right are shown, which can be arranged below or on the side of the flue gas combustion device. The flue gas to be combusted enters the flue gas passage from the inlet of the right flue gas passage 10, and the valve seat 100 and the valve core assembly 200 of the right flue control valve cooperate to open or close the flow passage into the flue gas combustion device.

[0026] Through the cooperation of the valve seat 100 and the valve core assembly 200 of the left flue control valve, the flow passage into the flue gas combustion device can be opened or closed, so that the flue gas after combustion is discharged through the left outlet and enters the subsequent flue gas purification process.

[0027] In the embodiment of the present application, the flue control valve for the flue gas combustion device comprises a valve seat 100 and a valve core assembly 200 used in cooperation. The valve seat 100 is installed in the flue gas passage 10 and forms a valve seat sealing surface 110, and the outer periphery of the valve core assembly 200 forms a valve core sealing surface 210. In the closed state, the valve seat sealing surface 110 and the valve core sealing surface 210 cooperate.

[0028] Please refer to Figure 1 , in combination with Figures 2 to 4 , Figure 2 is Figure 1 The enlarged view of part A in FIG. 1; Figure 3 is Figure 2 The schematic diagram of the cooperation of the valve seat and the valve core assembly in FIG. 1; Figure 4 is Figure 2 The schematic diagram of the separation of the corresponding sealing surfaces of the valve seat and the valve core assembly. In this embodiment, the flue control valve has a large profile size, such as Figure 4As shown, both the valve seat sealing surface 110 and the valve core sealing surface 210 are divided into two parts, inner and outer. The valve seat sealing surface 110 includes a first sealing surface 111 and a second sealing surface 112, arranged inner and outer. In this embodiment, the first sealing surface 111 is an inner conical annular surface, and the second sealing surface 112 is a downward-facing plane. The valve core sealing surface 210 includes a first core sealing surface 211 and a second core sealing surface 212, arranged inner and outer.

[0029] The valve core assembly 200 includes a body portion located in the middle. In this embodiment, the body portion is generally disc-shaped, with a smaller outer diameter at the top and a larger outer diameter at the bottom, thus forming a stepped structure. A first core sealing surface 211 is formed on the outer peripheral surface of the stepped structure, opposite to a first sealing surface 111; a second sealing surface 112 is formed on the upward-facing surface of the stepped structure, opposite to a second sealing surface 112.

[0030] In the valve core assembly 200, the first core sealing surface 211 is provided with an elastic metal sealing ring 213 extending outward from its periphery. The elastic metal sealing ring 213 can be embedded in the body of the valve core assembly 200 or fixed by a layered clamping method. The number of elastic metal sealing rings 213 can be determined according to the actual situation. In this embodiment, two layers of elastic metal sealing rings 213 are selected for installation.

[0031] like Figure 4 As shown, the upward-facing surface of the step is a plane, which serves as the reference plane for the second core sealing surface 212. With reference to the reference plane, the second core sealing surface 212 forms two annular grooves around the center line C. The two grooves are close together, and an annular protrusion is formed in the middle.

[0032] In the valve seat 100, corresponding to the first core sealing surface 211, the first seat sealing surface 111 is an inner conical annular surface. Corresponding to the groove and protrusion of the second core sealing surface 212, the second seat sealing surface 112 is provided with two annular convex strips, the two convex strips are close together, and an annular groove is formed in the middle.

[0033] like Figure 3 As shown, when the flue control valve is closed, the first core sealing surface 211 corresponds to the first seat sealing surface 111, and the periphery of the elastic metal sealing ring 213 abuts against the first seat sealing surface 111. The second seat sealing surface 112 corresponds to the second core sealing surface 212, and the protrusion extends into the corresponding groove. Please refer to... Figure 5 ,for Figure 3The enlarged view of the middle B part shows the principle of the labyrinth seal formed by the corresponding sealing surfaces of the valve seat and the valve core assembly. When the flue control valve is closed, the convex part top m1 and the groove bottom m2 in the corresponding convex strip and groove form a labyrinth seal. As shown in the figure, at least three of the labyrinth sealings are formed between the second seat sealing surface 112 and the second core sealing surface 212. The three labyrinth sealings are staggered, which increases the leakage flue gas travel distance as a whole and ensures the sealing performance.

[0034] Also referring to Figure 5 , and combining Figure 3 and Figure 4 , the flue control valve further comprises a fluid source groove 101 formed in the second seat sealing surface 112. In this embodiment, the fluid source groove 101 can be located in the second seat sealing surface 112 and inside the convex strip of the second seat sealing surface 112. The fluid source groove 101 is in communication with the source of pressurized fluid; the groove is in communication with the source of pressurized fluid through the fluid source groove 101.

[0035] With this flue control valve, the relative position of the valve seat 100 and the valve core assembly 200 can be defined by the periphery of the elastic metal sealing ring 213 abutting against the first seat sealing surface 111, avoiding “hard contact” between the valve seat 100 and the valve core assembly 200, and achieving “soft fit” of the two; at the same time, the fit of the periphery of the elastic metal sealing ring 213 and the first seat sealing surface 111 can achieve the first sealing of the fitting surface: contact sealing. At the same time, the convex strip in the second seat sealing surface 112 extends into the corresponding groove in the second core sealing surface 212, thereby increasing the flue gas leakage flow path through the gap, increasing the difficulty of flue gas leakage, and forming the second sealing of the flue gas: labyrinth seal. In addition, the groove is in communication with the source of pressurized fluid, and when the flue control valve is closed, the groove can be filled with pressurized fluid, which can form an obstacle to the leakage flue gas on one hand, and can form an impact on the leakage flue gas in the opposite direction on the other hand, forming the third sealing of the flue gas: fluid sealing.

[0036] In addition, with this flue control valve, the impact of the pressurized fluid will produce a sweeping effect, thereby achieving the “self-cleaning” effect of the sealing fitting surface, reducing the corrosion and damage of the sealing fitting surface by high-temperature flue gas, and thereby improving the reliability and prolonging the service life of the flue control valve. Through the “soft fit” between the periphery of the elastic metal sealing ring 213 and the first seat sealing surface 111, the impact or collision of the sealing fitting surface, the convex or the groove during closing or opening operation can be avoided, which also promotes the reliability and adaptability of the sealing fitting surface. Furthermore, the flue control valve can meet the needs of the flue gas combustion device, ensure the sealing effect of the flue gas passage, and also has a long service life and high reliability.

[0037] It can be understood that the recess is communicated with the source of fluid under pressure to achieve the effect of fluid sealing. In the embodiment, the fluid source groove 101 is arranged, and the recess is communicated with the source of fluid under pressure through the fluid source groove 101, so that a pressure storage cavity is formed between the sealing surfaces, which can maintain the pressure of the external fluid and reduce the leakage of flue gas, and can also maintain or improve the uniformity of the fluid pressure in the circumferential direction of the recess, thereby improving the reliability of the labyrinth seal. In the embodiment, the cross-sectional area of the fluid source groove 101 is greater than the cross-sectional area of the recess, for example, the cross-sectional area of the fluid source groove 101 is 3-8 times the cross-sectional area of the recess. In this way, the circumferential uniformity of the labyrinth seal and the fluid seal can be ensured.

[0038] As shown in Figure 5 , the fluid source groove 101 is arranged outside the convex strip in the second seat sealing surface 112 to form an airflow that drives the leaked flue gas inward, thereby improving the effect of fluid sealing. Of course, according to the description of this part, the fluid source groove 101 can also be arranged with the convex strip or the recess in a suitable manner or at intervals to achieve the effect of driving the leaked flue gas with the fluid under pressure. As shown in Figure 1 and Figure 2 , in the embodiment, the fluid source groove 101 is communicated with the source of fluid under pressure through the pipeline 20. The pipeline 20 is relatively fixed with the valve seat 100.

[0039] Of course, the fluid source groove 101 is not limited to being arranged in the second seat sealing surface 112, but can also be formed in the second core sealing surface 212. Correspondingly, a suitable pipeline and channel can be arranged in the valve core assembly 200 to communicate the fluid source groove 101 with the source of fluid under pressure. Considering that the valve core assembly 200 needs to be opened and closed at a high frequency, it is preferred that the pipeline or channel is arranged in the valve seat 100.

[0040] In the embodiment, the source of fluid under pressure can be a gas storage device, which can maintain the internal gas at a predetermined pressure to provide the fluid source groove 101 or the recess with gas (such as air) having a suitable pressure when the flue control valve is closed. Of course, the source of fluid under pressure can also be provided by the sweeping device of the flue gas combustion device. Of course, the valve core assembly 200 and the valve seat 100 are separated, and the fluid filling can be disconnected when the flue control valve is opened. In order to adapt to the opening / closing period and frequency of the flue control valve, the period and frequency of the gas filling can be appropriately controlled according to the pressure of the source of fluid under pressure, the pipeline and the fluid control valve parameters.

[0041] It can be understood that the convex ring or the recess can be a 360-degree, closed ring, or a 330-degree, 270-degree arc-shaped groove, or a plurality of intermittent arc-shaped grooves. The plurality of convex rings or convex grooves can be arranged in a staggered manner to ensure the overall labyrinth seal and fluid seal effect in the circumferential direction.

[0042] In the embodiment, the fluid can be filled into the fluid source groove 101 or recess more quickly, the fluid sealing effect can be ensured, the fluid source groove 101 or recess can have multiple fluid inlet ports, and each fluid inlet port is communicated with the pressurized fluid source. Of course, the multiple fluid inlet ports can be uniformly arranged in the circumferential direction or can be arranged non-uniformly according to the distance of the pipeline to achieve pressure balance. The pressurized fluid source can be selected according to actual conditions and can include at least one of a pressurized air supply source (such as an air storage device, an air pump, etc.) and a pressurized liquid supply source (a water tank with a predetermined pressure, a water pump, etc.). Air can be used as the fluid sealing medium more conveniently, and the sealing effect can be improved by using pressurized liquid (such as water). The pressurized air supply source and the pressurized liquid supply source can be further provided with a gas-liquid mixer to provide a gas-liquid mixture. The comprehensive effect of air and liquid can be obtained by using the gas-liquid mixture as the fluid sealing medium. Of course, other substances and components can be added to achieve the fluid sealing effect.

[0043] In the embodiment, the reference surface of the second seat sealing surface 112 is a plane, and the reference surface of the corresponding second core sealing surface 212 is also a plane, so that the convex and the recess are convenient to process and the matching precision is ensured.

[0044] The first seat sealing surface 111 is an inner conical annular surface, and the first core sealing surface 211 is provided with multiple elastic metal sealing rings 213 extending outward in the circumferential direction. In this way, when the elastic metal sealing ring 213 and the first seat sealing surface 111 produce friction, deviation due to deposition, and size error, the adaptability can be maintained by using the characteristics of the inner conical annular surface. Figure 4 As shown in the figure, in the embodiment, the outer diameter of the elastic metal sealing ring 213 close to the valve seat 100 is smaller than the outer diameter of the elastic metal sealing ring 213 away from the valve seat 100, that is, the outer diameter of the elastic metal sealing ring 213 gradually decreases in the direction from top to bottom. In this way, the contact sealing effect of each elastic metal sealing ring 213 can be ensured, and each elastic metal sealing ring 213 can produce effective contact sealing as much as possible, so that the sealing effect is improved. In addition, the rigidity of the elastic metal sealing ring 213 close to the valve seat 100 can be smaller than the rigidity of the elastic metal sealing ring 213 away from the valve seat 100 (such as selecting elastic metal sealing rings with different thicknesses from the same material or stacking the same thickness of plate material to form elastic metal sealing rings 213 with different rigidity). In this way, the sealing effect can be ensured while the contact impact is reduced, the damage is reduced, and the reliability is improved.

[0045] It can be understood that the cross section of the elastic metal sealing ring 213 is not limited to a plate shape, but can also be circular or other shapes.

[0046] It can be understood that the first seat sealing surface 111 of the inner conical annular surface and the second seat sealing surface 112 of the plane are not limited to being arranged inside and outside, and can also be arranged outside and inside, that is, the first seat sealing surface 111 of the inner conical annular surface is arranged on the second seat sealing surface 112, and the effect of triple sealing can also be achieved.

[0047] The above describes the specific implementation provided by the present application in detail. The principle and implementation manner of the present application are described by using specific examples, and the above description of the examples is only used to help understand the core idea of the present application. It should be pointed out that, for ordinary skilled in the art, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A flue control valve for a flue gas combustion device, comprising a valve seat (100) and a valve core assembly (200) used in cooperation, the valve seat (100) is installed in a flue gas passage (10) and forms a valve seat sealing surface (110), the valve core assembly (200) forms a valve core sealing surface (210); the valve seat sealing surface (110) and the valve core sealing surface (210) are opposite; characterized in that, The valve seat sealing surface (110) includes a first seat sealing surface (111) and a second seat sealing surface (112); the valve core sealing surface (210) includes a first core sealing surface (211) and a second core sealing surface (212). The first core sealing surface (211) is provided with an elastic metal sealing ring (213) extending outward from the periphery. The second sealing surface (112) is provided with an annular protrusion or an annular groove, and the second core sealing surface (212) is provided with an annular groove and an annular protrusion; When the flue control valve is closed, the first core sealing surface (211) corresponds to the first seat sealing surface (111), and the periphery of the elastic metal sealing ring (213) abuts against the first seat sealing surface (111); the second seat sealing surface (112) corresponds to the second core sealing surface (212), and the protrusion extends into the groove; The groove is connected to a pressurized fluid source.

2. The flue gas control valve for a flue gas combustion device according to claim 1, characterized in that, In the corresponding convex strip and groove, the top of the convex part (m1) and the bottom of the groove (m2) form a labyrinth seal fit; at least three labyrinth seal fits are formed between the second seat sealing surface (112) and the second core sealing surface (212).

3. The flue gas control valve for a flue gas combustion device according to claim 2, characterized in that, It also includes a fluid source groove (101) formed on the second seat sealing surface (112) and / or the second core sealing surface (212); the fluid source groove (101) is in communication with a pressurized fluid source; The groove is connected to a pressurized fluid source through the fluid source groove (101).

4. The flue gas control valve for a flue gas combustion device according to claim 3, characterized in that, The cross-sectional area of ​​the fluid source groove (101) is larger than the cross-sectional area of ​​the groove.

5. The flue gas control valve for a flue gas combustion device according to claim 3, characterized in that, The cross-sectional area of ​​the fluid source groove (101) is 3-8 times the cross-sectional area of ​​the groove.

6. The flue gas control valve for a flue gas combustion device according to any one of claims 1-5, characterized in that, The first sealing surface (111) is an inner conical annular surface; The first core sealing surface (211) is provided with a plurality of elastic metal sealing rings (213) extending outward from the periphery.

7. The flue gas control valve for a flue gas combustion device according to claim 6, characterized in that, The outer diameter of the elastic metal sealing ring (213) near the valve seat (100) is smaller than the outer diameter of the elastic metal sealing ring (213) away from the valve seat (100).

8. The flue gas control valve for a flue gas combustion device according to claim 6, characterized in that, The stiffness of the elastic metal sealing ring (213) closer to the valve seat (100) is less than the stiffness of the elastic metal sealing ring (213) farther away from the valve seat (100).

9. The flue gas control valve for a flue gas combustion device according to any one of claims 1-5, characterized in that, The first sealing surface (111) and the second sealing surface (112) are arranged inside and outside.

10. The flue gas control valve for a flue gas combustion device according to any one of claims 1-5, characterized in that, The reference plane of the second sealing surface (112) is a plane.

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