Double-drum transverse type controllable denitration smoke temperature hot water boiler

Abstract

The application discloses a double-drum transversely-arranged controllable denitration-removing warm water boiler, and relates to the field of double-drum transversely-arranged boilers. The boiler comprises an upper drum, a lower drum, a convection tube bundle, a high-temperature flue gas pipe, a low-temperature flue gas pipe, a temperature control valve, a mixed flue, an ash collecting cylinder and an SCR processor. A guide ash rib is arranged on the inner wall of the mixed flue and surrounds the mixed flue in a circumferential direction. The extension direction of the guide ash rib is perpendicular to the height direction of the mixed flue. In the ash cleaning mode, the temperature control valve performs a thermal shock action deviating from the normal flue gas temperature adjusting range, so that the inner wall of the mixed flue is deformed thermally. The ash layer across the guide ash rib is sheared at the guide ash rib and is cracked along the guide ash rib ring line. The cracked ash layer is peeled off and falls into the ash collecting cylinder below. The application utilizes the existing temperature control valve of the boiler as an ash cleaning excitation source, realizes the on-line self-ash cleaning of the mixed flue inner wall accumulated ash under the premise of not introducing an additional ash cleaning power source, and solves the technical problem that the existing boiler mixed flue accumulated ash needs to be cleaned by stopping the boiler or additional ash cleaning equipment needs to be installed.

Description

Technical Field

[0001] This invention relates to the field of double-drum horizontal boiler technology, specifically to a double-drum horizontal controllable denitrification flue gas hot water boiler. Background Technology

[0002] The horizontally mounted double-drum coal-fired hot water boiler is one of the core pieces of equipment in the district heating sector. This type of boiler arranges the upper and lower drums horizontally side-by-side, with a convection tube bundle between the two drums serving as the main convective heat exchange surface. The furnace and combustion chamber are located in front of the double drums, forming the combustion space. To meet the stringent requirements of the SCR denitrification process for flue gas temperature windows, the horizontally mounted double-drum boiler typically has low-temperature flue gas outlets above and below the lower drum, and high-temperature flue gas outlets, respectively. The high-temperature flue gas, after being regulated by a temperature control valve, mixes with the low-temperature flue gas in a mixing duct. The resulting uniformly heated flue gas is then fed into the SCR denitrification reactor for denitrification treatment. The denitrified flue gas then flows through an economizer to recover waste heat before being discharged.

[0003] The prior patent application (publication number CN121539876A) with application number CN202610062802.8 discloses a dual-drum horizontally positioned controllable denitrification flue gas temperature hot water boiler. When the boiler load varies within the range of 50% to 100%, the temperature of the flue gas entering the SCR denitrification reactor can be adjusted via a temperature control valve, achieving controllable adjustment of the denitrification flue gas temperature. The boiler's convection tube bundles are arranged in parallel and separated into a first tube bundle and a second tube bundle by a membrane wall partition. The flue gas flows sequentially through the two tube bundle regions, featuring a compact structural layout and minimal ash accumulation in the convection tube bundles.

[0004] However, during the long-term operation of the aforementioned boilers, fly ash from the flue gas gradually accumulates on the inner wall of the mixing flue. The mixing flue is where high-temperature and low-temperature flue gas meet and mix. Here, the flue gas velocity decreases and its direction changes. Furthermore, the wall temperature is significantly lower than the flue gas temperature. Under the combined effects of thermophoretic forces, turbulent boundary layer capture, and localized flow dead zones, fly ash particles continuously deposit on the inner wall of the mixing flue, forming an ash layer. As the ash layer gradually thickens, the effective flow cross-section of the mixing flue shrinks, forcing the flue gas velocity to increase. This shortens the mixing time between the high and low-temperature flue gases, reducing mixing uniformity and causing temperature stratification in the height direction of the flue gas entering the SCR denitrification reactor. The temperature sensor installed at the inlet of the SCR denitrification reactor typically only measures the temperature at a single point and cannot reflect the true state of cross-sectional temperature stratification. The temperature control valve adjusts based on this distorted temperature signal, which may lead to localized overheating and deactivation of the SCR catalyst or localized low-temperature ammonium salt deposition and blockage, severely affecting the operational safety of the denitrification system and the catalyst's lifespan.

[0005] Currently, the main methods for removing ash buildup on the inner walls of mixed flues include manual cleaning during boiler shutdown, and installing steam soot blowers or sonic soot blowers inside the flues. Shutting down the boiler for cleaning affects heating continuity and cannot meet the demand for uninterrupted operation during the heating season; installing steam soot blowers introduces additional steam consumption, and the steam jet in a high-temperature, dusty environment may exacerbate localized erosion and corrosion; installing sonic soot blowers increases equipment investment and maintenance workload. How to achieve online removal of ash buildup on the inner walls of mixed flues without large-scale structural modifications or the introduction of additional cleaning power sources remains an unsolved technical challenge in this field.

[0006] Therefore, it is necessary to provide a dual-drum horizontally positioned controllable denitrification flue gas hot water boiler to solve the above problems. Summary of the Invention

[0007] To solve the above problems, the present invention provides the following technical solution: a dual-drum horizontally positioned controllable denitrification flue gas temperature and hot water boiler, including an upper drum, a lower drum, and a convection tube bundle connecting the upper drum and the lower drum. High-temperature flue gas pipes and low-temperature flue gas pipes are respectively connected to the sides of the convection tube bundle. The high-temperature flue gas pipes and the low-temperature flue gas pipes converge into a mixing flue. A temperature control valve is installed on the high-temperature flue gas pipe. An ash collection cylinder is installed below the mixing flue. The mixing flue is connected to an SCR processor via a connecting pipe. Multiple ash-guiding ridges are evenly distributed on the inner wall of the mixing flue. The ash-guiding ridges are arranged circumferentially around the inner wall of the mixing flue, and their extension direction is perpendicular to the height direction of the mixing flue. In the ash removal mode, the temperature control valve performs a thermal shock action that deviates from the normal flue gas temperature adjustment range, causing thermal deformation of the inner wall surface of the mixing flue. The ash layer that crosses the ash guide ridge is sheared at the ash guide ridge and cracks along the ash guide ridge ring line. The cracked ash layer peels off and falls into the ash collection cylinder below.

[0008] Furthermore, as a preferred embodiment, a first valve body is provided on the side of the connecting pipe closer to the SCR processor, and a telescopic cylinder is connected to the side of the connecting pipe away from the SCR processor via a branch pipe, on which a second valve body is provided; the telescopic cylinder has a telescopic end and a fixed end, and a reset member is connected between the telescopic end and the fixed end.

[0009] Furthermore, as a preferred embodiment, the reset component includes multiple reset units, each reset unit including two connecting plates, with a spring, a guide telescopic rod, and a slow-rebound component connected between the two connecting plates.

[0010] Furthermore, as a preferred embodiment, the wall of the mixing flue includes an outer plate, an insulation plate, and an inner plate from the outside to the inside. Thermal expansion blocks and pads are arranged in a crisscross pattern along the height direction on the inner side of the inner plate. The thermal expansion coefficient of the pads is less than that of the thermal expansion blocks. The inner ends of the multiple thermal expansion blocks and pads jointly support and connect the inner wall surface of the mixing flue.

[0011] Furthermore, as a preferred embodiment, a groove is provided in the middle of the guide rib, a ball is disposed in the groove, and a sealing plate is fixed at the opening of the groove to confine the ball within the groove.

[0012] Furthermore, as a preferred embodiment, the ash guide ridge is disposed on the inner wall surface of the mixing flue and located between the adjacent thermal expansion block and the pad block. When the temperature control valve performs a thermal shock action, the expansion amount of the thermal expansion block is greater than the expansion amount of the pad block, causing the inner wall surface of the mixing flue to deform in a wave-like manner. The ash guide ridge tilts accordingly, driving the ball to roll along the slide groove and impact the ash guide ridge.

[0013] Furthermore, as a preferred embodiment, the ash guide rib is a strip-shaped component with a triangular or trapezoidal cross-section, which is fixed to the inner wall of the mixing flue by welding.

[0014] Furthermore, as a preferred embodiment, the thermal shock action is performed when the inlet flue gas temperature of the SCR processor is in the range of 320°C to 380°C, and the duration of a single cleaning operation does not exceed 15 seconds.

[0015] Compared with the prior art, the present invention provides a dual-drum horizontally positioned controllable denitrification flue gas temperature and hot water boiler, which has the following beneficial effects: (1) This invention utilizes the existing temperature control valve of the boiler as the ash removal excitation source. The thermal shock action of the temperature control valve temporarily deviating from the normal flue gas temperature adjustment range replaces the traditional steam blowing, sonic ash removal or mechanical vibration and other additional ash removal devices. No additional power source is required, and the daily operating energy consumption of the boiler is not increased. Online self-ash removal of ash accumulated on the inner wall of the mixing flue is realized.

[0016] (2) The present invention provides a circumferential ash guide ridge on the inner wall of the mixing flue. The extension direction of the ash guide ridge is perpendicular to the height direction of the mixing flue. When the temperature control valve performs a thermal shock action to cause thermal deformation of the inner wall of the mixing flue, the ash layer that crosses the ash guide ridge is sheared at the ash guide ridge and cracks along the ash guide ridge ring line. The ash guide ridge provides a pre-set cracking path for the ash layer, so that the ash layer peels off from the wall in a controllable and orderly manner, and the peeled ash pieces fall into the ash collection cylinder below.

[0017] (3) The present invention leads out a branch pipe on the connecting pipe and connects to the telescopic cylinder. The telescopic cylinder can absorb the flue gas pressure pulse during the thermal shock action of the temperature control valve. After the thermal shock action ends, it is slowly reset by the slow return spring in the reset component, and the hot gas temporarily stored in the telescopic cylinder is smoothly discharged back to the connecting pipe, which effectively suppresses the impact of the thermal shock action on the SCR processor.

[0018] (4) The present invention sets up a structure in which thermal expansion blocks and pads are arranged in a cross pattern in the wall of the mixing flue. By utilizing the difference in the thermal expansion coefficients of the two, the overall thermal deformation of the wall surface caused by the thermal shock of the temperature control valve is transformed into a local wave-like deformation, which increases the local curvature change range at the location of the ash guide ridge and improves the reliability of ash layer cracking. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a horizontally mounted, double-drum, controllable denitrification flue gas hot water boiler. Figure 2 This is a schematic diagram of the reset component; Figure 3 This is a schematic diagram of the structure of a mixed flue. Figure 4 This is a schematic diagram of the ash guide rib structure; In the diagram: 1. Upper boiler drum; 2. Lower boiler drum; 3. Convection tube bundle; 4. High-temperature flue gas pipe; 5. Low-temperature flue gas pipe; 6. Temperature control valve; 7. Mixing flue; 8. Ash collection cylinder; 9. Connecting pipe; 10. SCR processor; 11. Branch pipe; 12. Telescopic cylinder; 13. Reset component; 131. Connecting plate; 132. Spring; 133. Guide telescopic rod; 134. Slow rebound component; 71. Outer plate; 72. Inner plate; 73. Insulation plate; 74. Thermal expansion block; 75. Pad block; 76. Ash guide ridge; 761. Slide groove; 762. Sealing plate; 763. Sphere. Detailed Implementation

[0020] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0021] Example: Refer to Figures 1 to 4This embodiment provides a dual-drum horizontally arranged controllable denitrification flue gas hot water boiler. The boiler includes an upper drum 1 and a lower drum 2 arranged horizontally, connected by a convection tube bundle 3. The convection tube bundle 3 is arranged in a row, and its interior is equipped with a membrane wall partition to divide the convection tube bundle 3 into two flue gas flow areas, namely a first tube bundle and a second tube bundle. The flue gas flows through the first tube bundle and the second tube bundle successively, completing convective heat exchange with the circulating water inside the tubes. The sides of the convection tube bundle 3 are respectively connected to a high-temperature flue gas pipe 4 and a low-temperature flue gas pipe 5: the low-temperature flue gas pipe 5 leads out lower-temperature flue gas from above the lower drum 2, and the high-temperature flue gas pipe 4 leads out higher-temperature flue gas from below the lower drum 2. A temperature control valve 6 is installed on the high-temperature flue gas pipe 4, and the amount of high-temperature flue gas introduced is controlled by adjusting the opening of the temperature control valve 6. High-temperature flue gas pipe 4 and low-temperature flue gas pipe 5 converge into the mixing flue 7. After the two flue gases of different temperatures are mixed evenly in the mixing flue 7, they are sent to the SCR processor 10 for denitrification treatment through the connecting pipe 9. A dust collection cylinder 8 is installed below the mixing flue 7 to collect the ash that naturally settles or peels off from the inner wall of the mixing flue 7.

[0022] Reference Figure 3 The wall of the mixing flue 7 adopts a multi-layer structure, consisting of an outer plate 71, an insulation plate 73, and an inner plate 72 from the outside to the inside. The outer plate 71 is a carbon steel load-bearing plate, providing structural support and sealing. The insulation plate 73 is a layer of heat-insulating material, used to reduce heat loss from the inside of the mixing flue 7 and maintain the temperature gradient inside the wall. The inner plate 72 provides the mounting base for the thermal expansion blocks 74 and the spacers 75. On the inner surface of the inner plate 72, multiple thermal expansion blocks 74 and spacers 75 are arranged alternately along the height of the mixing flue 7. The thermal expansion blocks 74 are made of a metal material with a high coefficient of thermal expansion, while the spacers 75 are made of a metal material with a low coefficient of thermal expansion; the coefficient of thermal expansion of the spacers 75 is significantly smaller than that of the thermal expansion blocks 74. The inner ends of the thermal expansion blocks 74 and the spacers 75 (i.e., the ends facing the inside of the mixing flue 7) jointly support and connect to the inner wall surface of the mixing flue 7, which is a thin-walled metal lining that is in direct contact with the flue gas.

[0023] The purpose and benefit of the cross arrangement of thermal expansion blocks 74 and pads 75 is that when the temperature control valve 6 performs thermal shock, the flue gas temperature changes at different heights inside the mixing flue 7. Since the coefficient of thermal expansion of thermal expansion blocks 74 is significantly greater than that of pads 75, under the same temperature change, the expansion or contraction of thermal expansion blocks 74 is significantly greater than that of pads 75. This difference in expansion prevents the inner wall of the mixing flue 7, supported by both thermal expansion blocks 74 and pads 75, from undergoing uniform overall expansion and contraction. Instead, local peaks or troughs are generated at the junctions between adjacent thermal expansion blocks 74 and pads 75, resulting in a wavy deformation of the inner wall surface. This wavy deformation effectively concentrates the thermal deformation of the wall surface in the junction areas, providing sufficient local curvature variation for the ash-guiding ribs 76 located in these areas.

[0024] Continue to refer to Figure 3 Multiple ash-guiding ridges 76 are evenly distributed on the inner wall surface of the mixing flue 7. These ridges 76 are arranged circumferentially around the inner wall surface of the mixing flue 7, extending horizontally along the inner surfaces of the four wall panels and connecting end-to-end to form a closed line. The extension direction (horizontal direction) of the ash-guiding ridges 76 is perpendicular to the height direction of the mixing flue 7. The ash-guiding ridges 76 essentially create a pre-set circumferential weak loop in the ash layer. When thermal deformation occurs on the wall surface, this area becomes a stress concentration zone in the ash layer, causing cracking to begin and propagate along the loop of the ash-guiding ridges 76. The ash-guiding ridges 76 are strip-shaped components with a triangular or trapezoidal cross-section, fixed to the inner wall surface of the mixing flue 7 by welding.

[0025] Each ash-guiding ridge 76 is located on the inner wall of the mixing flue 7 at the junction between an adjacent thermal expansion block 74 and a pad block 75. The reason for this arrangement is that the crests and troughs of the wavy deformation of the wall surface appear precisely at the junction of the thermal expansion block 74 and the pad block 75, where the local curvature change is the greatest and the displacement gradient is the steepest, allowing the ash-guiding ridge 76 to achieve the most significant change in tilt angle.

[0026] Reference Figure 4 A groove 761 is formed along the length of the middle of the guide rib 76. The cross-section of the groove 761 is rectangular or trapezoidal. One or more spheres 763 are placed in the groove 761. The diameter of the spheres 763 is slightly smaller than the width of the groove 761, allowing the spheres 763 to roll freely within the groove 761. A sealing plate 762 is fixed at the opening of the groove 761, which restricts the spheres 763 within the groove 761.

[0027] The working process of the ash guide 76 with built-in ball 763 is as follows: In the cleaning mode, the temperature control valve 6 performs a thermal shock action, causing the inner wall of the mixing flue 7 to undergo a wavy deformation. The ash guide 76 tilts as the wall posture changes, and the ball 763 in the chute 761 rolls back and forth along the tilt direction under the action of gravity, impacting the inner wall of the ash guide 76. The vibration generated by the impact is transmitted through the ash guide 76 to the ash layer in close contact with the ash guide 76, assisting the cracked ash layer to be completely peeled off from the inner wall of the mixing flue 7.

[0028] Specifically, the chute 761 is provided through the length of the guide rib 76, and its effective rolling length is not less than 80 mm, so that the ball 763 has sufficient acceleration distance within the chute 761. The width of the chute 761 is 18 mm to 20 mm, the depth is 12 mm to 15 mm, and the inner surface is electropolished, with the surface roughness Ra controlled between 0.2 μm and 0.4 μm.

[0029] Three to five spheres 763 are evenly placed along the length of the groove 761, with a gap of 2 mm to 5 mm between adjacent spheres 763. The diameter of the sphere 763 is 16 mm, slightly smaller than the width of the groove 761, allowing the sphere 763 to roll freely within the groove 761. The spheres 763 are made of tungsten alloy material, with a single sphere weighing approximately 37.5 g; the surface of the spheres 763 is treated with a DLC (diamond-like carbon) coating, with a coating thickness of 2 μm to 5 μm, a hardness of HV2000 or higher, and a coefficient of friction of 0.05 to 0.1. The inner surface of the chute 761 is also coated with DLC or nitrided to form a hard-hard contact pair with the surface of the ball 763. The rolling friction coefficient μ is controlled below 0.001 to ensure the impact effect. It should be noted that the impact mechanism of the ball 763 is only used as an auxiliary dust removal method and works in conjunction with the thermal deformation differential cracking mechanism: thermal deformation differential causes the dust layer to shear crack at the ash guide ridge 76 ring line, and the impact of the ball 763 removes the residual adhesion of the cracked dust layer and prevents the dust layer from adhering again. The two work together to achieve efficient dust removal.

[0030] Reference Figure 1 and Figure 2 A first valve body is provided on the side of the connecting pipe 9 closest to the SCR processor 10, and a telescopic cylinder 12 is connected to the side of the connecting pipe 9 furthest from the SCR processor 10 via a branch pipe 11, on which a second valve body is provided. The telescopic cylinder 12 is a telescopic sealed container with a cylindrical or rectangular cross-section, having a fixed end fixed to the boiler steel frame or foundation surface, and a telescopic end that can move freely along the axial direction. A reset member 13 is connected between the telescopic end and the fixed end. The reset member 13 includes multiple reset units evenly distributed along the circumference of the telescopic cylinder 12. Each reset unit includes two connecting plates 131, and a spring 132, a guide telescopic rod 133, and a slow rebound member 134 are connected between the two connecting plates 131; the slow rebound member 134 is a damping element (e.g., a hydraulic damping rod or a pneumatic damping rod), whose function is to delay the rebound speed of the spring 132.

[0031] The working process of the telescopic cylinder 12 and its auxiliary structures is as follows: During the thermal shock action of the temperature control valve 6, the second valve body on the branch pipe 11 is opened, and the first valve body on the connecting pipe 9 is closed. Under pressure, the flue gas in the mixing flue 7, driven by pressure, enters the telescopic cylinder 12 through the branch pipe 11. The pressure of the hot gas acts on the telescopic end of the telescopic cylinder 12, pushing the telescopic end to move outward and pulling the spring 132 in the reset member 13. Part of the pressure energy of the hot gas is converted into the elastic potential energy of the spring 132 and stored. After the thermal shock action ends, the second valve body on the branch pipe 11 is closed, and the first valve body on the connecting pipe 9 is opened. The slow rebound member 134 in the reset member 13 controls the rebound speed of the spring 132, so that the telescopic end of the telescopic cylinder 12 is slowly reset, and the hot gas temporarily stored in the telescopic cylinder 12 is smoothly discharged back to the connecting pipe 9, and enters the SCR processor 10 along with the main flue gas flow.

[0032] The specific operation process of the boiler ash removal mode is as follows: Step 1: Confirm that the inlet flue gas temperature of the SCR processor 10 is within the range of 320℃ to 380℃, and that the boiler is operating under stable load.

[0033] Step two: Empty the ash from the ash collection cylinder 8 to make room for the ash layer that is about to be peeled off.

[0034] Step 3: Open the second valve on branch pipe 11 and close the first valve on connecting pipe 9.

[0035] Step four: Control the temperature control valve 6 to perform a thermal shock action: Quickly adjust the temperature control valve 6 from its current normal operating opening to a near-fully closed position, hold for a first preset time, then quickly adjust the temperature control valve 6 to a fully open or large opening position, hold for a second preset time, and then return to the normal operating opening. The rapid opening and closing action of the temperature control valve 6 causes thermal deformation of the inner wall of the mixing flue 7, resulting in a wavy deformation of the wall surface, and the ash guide rib 76 tilts accordingly. The ash layer crossing the ash guide rib 76 is subjected to shearing action generated by differential displacement at the ash guide rib 76 and cracks along the ring line of the ash guide rib 76; at the same time, the ball 763 in the internal groove 761 of the ash guide rib 76 rolls back and forth and impacts the ash guide rib 76 under the drive of the tilting posture change of the ash guide rib 76 caused by the wall deformation, assisting the cracked ash layer to peel off from the wall surface. The peeled ash flakes fall into the ash collection cylinder 8 below.

[0036] Step 5: After the thermal shock action is completed, open the first valve body on the connecting pipe 9. The reset member 13 in the telescopic cylinder 12 is slowly reset under the control of the slow return member 134, so that the hot gas temporarily stored in the telescopic cylinder 12 is smoothly discharged back into the connecting pipe 9. Then close the second valve body on the branch pipe 11.

[0037] Step six: The duration of each ash cleaning should not exceed 15 seconds, and the boiler should be restored to normal operation.

[0038] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dual-drum horizontally mounted controllable denitrification flue gas temperature and hot water boiler, comprising an upper drum (1), a lower drum (2), and a convection tube bundle (3) connecting the upper drum (1) and the lower drum (2), wherein a high-temperature flue gas pipe (4) and a low-temperature flue gas pipe (5) are respectively connected to the side of the convection tube bundle (3), the high-temperature flue gas pipe (4) and the low-temperature flue gas pipe (5) converge into a mixing flue (7), a temperature control valve (6) is provided on the high-temperature flue gas pipe (4), an ash collection cylinder (8) is provided below the mixing flue (7), and the mixing flue (7) is connected to an SCR processor (10) through a connecting pipe (9), characterized in that: Multiple ash-guiding ribs (76) are evenly distributed on the inner wall surface of the mixing flue (7). The ash-guiding ribs (76) are arranged circumferentially around the inner wall surface of the mixing flue (7), and their extension direction is perpendicular to the height direction of the mixing flue (7). In the ash removal mode, the temperature control valve (6) performs a thermal shock action that deviates from the normal flue temperature adjustment range, causing thermal deformation of the inner wall surface of the mixing flue (7). The ash layer that crosses the ash guide ridge (76) is sheared at the ash guide ridge (76) and cracks along the ash guide ridge (76) ring line. The cracked ash layer peels off and falls into the ash collection cylinder (8) below.

2. The double-drum horizontally positioned controllable denitrification flue gas hot water boiler according to claim 1, characterized in that, The connecting pipe (9) is provided with a first valve body on the side close to the SCR processor (10), and the connecting pipe (9) away from the SCR processor (10) is connected to a telescopic cylinder (12) through a branch pipe (11). A second valve body is provided on the branch pipe (11). The telescopic cylinder (12) has a telescopic end and a fixed end, and a reset member (13) is connected between the telescopic end and the fixed end.

3. A horizontally mounted, double-drum, controllable denitrification flue gas hot water boiler according to claim 2, characterized in that, The reset component (13) includes multiple reset units, each of which includes two connecting plates (131), and a spring (132), a guide telescopic rod (133), and a slow-rebound component (134) are connected between the two connecting plates (131).

4. A double-drum horizontally positioned controllable denitrification flue gas hot water boiler according to claim 1, characterized in that, The wall of the mixing flue (7) includes an outer plate (71), a heat insulation plate (73) and an inner plate (72) from the outside to the inside. Thermal expansion blocks (74) and pads (75) are arranged in a cross pattern along the height direction on the inner side of the inner plate (72). The thermal expansion coefficient of the pads (75) is smaller than that of the thermal expansion blocks (74). The inner ends of the multiple thermal expansion blocks (74) and pads (75) jointly support and connect the inner wall of the mixing flue (7).

5. A horizontally mounted, double-drum, controllable denitrification flue gas hot water boiler according to claim 4, characterized in that, The guide rib (76) has a groove (761) in the middle, and a ball (763) is provided in the groove (761). A sealing plate (762) is fixed at the opening of the groove (761) to restrict the ball (763) in the groove (761).

6. A double-drum horizontally positioned controllable denitrification flue gas hot water boiler according to claim 5, characterized in that, The ash guide ridge (76) is disposed on the inner wall surface of the mixing flue (7) and located between the adjacent thermal expansion block (74) and the pad block (75). When the temperature control valve (6) performs thermal shock action, the expansion amount of the thermal expansion block (74) is greater than the expansion amount of the pad block (75), causing the inner wall surface of the mixing flue (7) to deform in a wave-like manner. The ash guide ridge (76) tilts accordingly, driving the ball (763) to roll along the slide groove (761) and impact the ash guide ridge (76).

7. A horizontally mounted, double-drum, controllable denitrification flue gas hot water boiler according to claim 5, characterized in that, The ash guide rib (76) is a strip-shaped component with a triangular or trapezoidal cross section, which is fixed to the inner wall of the mixing flue (7) by welding.

8. A double-drum horizontally positioned controllable denitrification flue gas hot water boiler according to claim 1, characterized in that, The thermal shock action is performed when the inlet flue gas temperature of the SCR processor (10) is in the range of 320°C to 380°C, and the duration of a single cleaning operation does not exceed 15 seconds.

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