Condensation type flue gas waste heat recovery steam boiler

Abstract

The invention provides a condensation type flue gas waste heat recovery steam boiler which comprises a bottom plate, a supporting table, a boiler body, an overhaul valve, a burner connecting pipe, a connecting base, a water chamber, a water connector, a vacuum pump, an anti-explosion assembly, a vacuum meter, a water level sight glass, a temperature sensor, a smoke outlet and a cooling assembly. The cooling assembly is arranged, the heat dissipation auxiliary effect of flue gas waste heat recovery on the inner sides of the cold flue gas pipe and the circulating water pipe is improved through stepped distribution of inclined meshes on the front side and the rear side, and through wavy arrangement of wavy meshes, the contact area with flue gas is increased, and meanwhile the heat exchange effect of the flue gas is indirectly improved in an auxiliary mode; by arranging the filtering mechanism, flue gas obtained after waste heat recovery is connected with the lower end of the filtering box to be discharged, liquid on the inner side of the filtering water tank is used for filtering the flue gas, and the flue gas is discharged through the air outlet, so that the effect after flue gas treatment is improved.

Description

Technical Field

[0001] The invention relates to the field of waste heat recovery equipment, and in particular to a condensing flue gas waste heat recovery steam boiler. Background Art

[0002] With the development of the national economy, the exploitation of large natural gas fields and their supporting facilities have been built and put into operation one after another. In order to improve the living and investment environment and meet the requirements of environmental protection and energy saving and consumption reduction, the demand for various forms of gas boilers has been increasing in recent years. At the same time, with the continuous development of high-efficiency, environmentally friendly and energy-saving boiler design, manufacturing technology and new materials (corrosion resistance and high heat transfer performance), condensing gas boilers have gradually matured and become universal in structure. In traditional boilers, the exhaust gas temperature is generally between 160 and 250°C, and the water vapor in the flue gas is still in an overheated state, and it is impossible to condense into liquid water and release latent heat of vaporization. The current flue gas waste heat recovery device also has the following disadvantages: the condenser adopts a serpentine tube, which has low heat exchange efficiency, large volume and high steel consumption; the condenser adopts a steel-aluminum composite fin tube, the inner part is carbon steel, and the outer part in contact with the flue gas is aluminum, which is compounded together by extrusion. This fin tube has poor corrosion resistance (condensed water is weakly acidic and has certain corrosion) and a short service life; the condenser adopts a stainless steel fin tube, which has a long service life but a high cost.

[0003] For example, the publication number CN201010119480.5 discloses "An integrated flue gas condensation waste heat recovery boiler", which adopts the countercurrent heat exchange between the two fluids in the plate-fin air preheater. The heat transfer coefficient is generally three times that of the shell and tube heat exchanger, which is more suitable for small temperature differences. The heat recovery is best when used for gas-to-gas heat exchange. The asymmetric plate flue gas condenser has a good low-potential heat recovery effect, and a single plate heat exchanger can achieve a heat recovery rate of more than 90%. The integrated design of the air preheater, flue gas condenser and boiler makes the overall structure of the boiler more compact, with strong corrosion resistance, safer equipment, more stable and reliable, and longer service life.

[0004] However, the waste heat generated during the operation of gas boilers is mainly caused by flue gas emissions, and the main reason is that due to the flue gas volume and flue gas emission temperature, part of the heat will be taken away by air flow during the emission process, causing heat loss; at the same time, the gas after combustion contains certain toxic gases, and the toxic gases are not treated, which indirectly causes environmental pollution. Summary of the invention

[0005] In order to solve the above technical problems, the object of the present invention is to provide a condensing flue gas waste heat recovery steam boiler.

[0006] Based on this, the present invention proposes a condensing flue gas waste heat recovery steam boiler, comprising a bottom plate, a support platform, a boiler body, an air intake pipe, a burner connecting pipe, a connecting seat, a water chamber, a water interface, a vacuum pump, an explosion-proof component, a vacuum gauge, a water level sight glass, a temperature sensor, a smoke outlet and a cooling component. A support platform is arranged on the left side of the top of the bottom plate, and the inner side of the upper end of the support platform is fixed to the bottom of the boiler body. An air intake pipe is installed at the lower end of the boiler body, and a burner connecting pipe and a smoke outlet are respectively arranged on the left and right sides of the boiler body. A connecting seat is installed in the middle of the top of the boiler body, and water chambers are respectively arranged on the left and right sides of the connecting seat. A water interface is installed in the middle of the upper end of the water chamber, and a vacuum pump and an explosion-proof component are respectively installed on the top of the connecting seat. The front end of the connecting seat is respectively connected to a vacuum gauge, a water level sight glass and a temperature sensor. The left end of the cooling component is connected to the smoke outlet. The cooling component comprises a corrugated mesh, an inclined mesh, a reaction box, a support plate, a pipe seat, a connecting pipe, a fixed tube plate, a flue gas The filter mechanism comprises a pipe, a filtering mechanism, a circulating water pipe, a circulating water pump, a water tank and a partition, the corrugated mesh is arranged on the inner side of the top end of the reaction box, an inclined mesh is arranged on the upper side of the front end of the reaction box, a support plate is installed on the lower side of the left end of the reaction box, a pipe seat is installed on the left side of the top end of the support plate, the inner side of the upper end of the pipe seat is fitted and connected with the lower side of the left end of the connecting pipe, the middle part of the connecting pipe is fixed to the inner side of the left end of the fixed tube plate, the right end of the connecting pipe is connected to the left end of the flue gas pipe, and the right end of the flue gas pipe is connected to the The left end upper side of the filter mechanism is connected, the filter mechanism is installed in the middle of the right end of the reaction box, a smoke pipe is arranged on the inner side of the circulating water pipe, the right end of the circulating water pipe is connected to the output end of the circulating water pump, the input end of the circulating water pump is connected to the right side of the inside of the water tank, the water tank is arranged on the lower side of the inside of the reaction box, the partition is installed in the middle of the inner side of the reaction box, the lower side of the left end of the circulating water pipe passes through the inner side of the left end of the partition and is connected to the inner side of the water tank, and the left end of the smoke pipe is connected to the smoke outlet.

[0007] Optionally, the filtering mechanism includes a filter box, a filter water tank, a movable baffle and an air outlet. The filter box is provided with a filter water tank on the inner side, and the movable baffle is provided with an air outlet on the inner side. The filter box is installed in the middle of the right end of the reaction box, and the right end of the flue gas pipe is connected to the upper side of the left end of the filter box.

[0008] Optionally, two groups of inclined meshes are provided and are oppositely distributed on the upper inner sides of the front and rear ends of the reaction box, and multiple groups of corrugated meshes are provided and are inclined on the inner side of the top end of the reaction box, thereby helping to improve the heat dissipation of the circulating water pipe and increasing the contact area and heat exchange effect with the flue gas through the inclined meshes.

[0009] Optionally, a circular notch is provided on the inner side of the upper end of the tube seat and the inner left side of the fixed tube plate, and the size of the notch is consistent with the outer radius of the connecting tube, thereby improving the stability of the semi-suspended setting of the connecting tube.

[0010] Optionally, the circulating water pipes are all arranged in a serpentine shape on the inner upper side of the reaction box, and the flue gas pipes are arranged in a serpentine shape on the inner side of the circulating water pipes, thereby reducing the loss of flue gas heat exchange energy.

[0011] Optionally, the left end of the flue gas pipe passes through the upper left side of the reaction box, and is connected to the inner side of the right end of the connecting pipe. The outlet end of the flue gas pipe passes through the upper right half of the circulating water pipe and is connected to the left end of the filter box, thereby improving the reuse rate of waste heat recovery.

[0012] Optionally, a circular hole is provided at the connection between the filter box and the reaction box, and the size of the hole matches the right end of the smoke pipe, so as to improve the accuracy of smoke transportation.

[0013] Optionally, the top end of the filter box is connected to the left end of the movable baffle through a movable shaft, and a plurality of groups of air outlets are evenly distributed on the inner side of the movable baffle, thereby playing a role in exhaust treatment of flue gas and liquid.

[0014] The present invention has the following advantages: The present invention provides a condensing flue gas waste heat recovery steam boiler through improvement, which has the following improvements compared with similar equipment:

[0015] Advantage 1: The present invention provides a condensing flue gas waste heat recovery steam boiler, which is provided with a cooling component and has inclined meshes on the front and rear sides arranged in a stepped manner to improve the heat dissipation auxiliary effect of flue gas waste heat recovery inside the cold flue gas pipe and the circulating water pipe. The wavy setting of the corrugated mesh increases the contact area with the flue gas and also indirectly assists in improving the heat exchange effect of the flue gas.

[0016] Advantage 2: The present invention provides a condensing flue gas waste heat recovery steam boiler, which is equipped with a cooling component, and the water in the water tank is extracted and transported by a circulating water pump, and the water inside the water tank is transported in a serpentine shape through a circulating water pipe and contacts the outside of the flue pipe, and the water in the water tank is transported back to the water tank for recycling, thereby indirectly increasing the reuse effect of cold water circulation heating.

[0017] Advantage 3: The present invention provides a condensing flue gas waste heat recovery steam boiler, which is equipped with a filtering mechanism, and discharges the flue gas after waste heat recovery by connecting it to the lower end of the filter box, and the liquid inside the filter water tank filters the flue gas and discharges it through the air outlet, thereby improving the effect of flue gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the planar structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the cooling assembly of the present invention;

[0021] Figure 4 It is a schematic diagram of the left view of the structure of the cooling assembly of the present invention;

[0022] Figure 5 It is a schematic diagram of the planar structure of the cooling assembly of the present invention;

[0023] Figure 6 It is a schematic diagram of the perspective structure of the cooling assembly of the present invention;

[0024] Figure 7 It is a schematic diagram of the planar structure of the filtering mechanism of the present invention.

[0025] Explanation of the accompanying drawings: base plate-1, support platform-2, boiler body-3, air inlet pipe-4, burner connecting pipe-5, connecting seat-6, water chamber-7, water interface-8, vacuum pump-9, explosion-proof component-10, vacuum gauge-11, water level sight glass-12, temperature sensor-13, smoke outlet-14, cooling component-15, corrugated mesh-151, inclined mesh-152, reaction box-153, support plate-154, pipe seat-155, connecting pipe-156, fixed tube sheet-157, flue gas pipe-158, filtering mechanism-159, circulating water pipe-1510, circulating water pump-1511, water tank-1512, partition-1513, filter box-1591, filter water tank-1592, movable baffle-1593, air outlet-1594. DETAILED DESCRIPTION

[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0029] For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] Please refer to Figure 1 and 2 The present embodiment provides a condensing flue gas waste heat recovery steam boiler, comprising a bottom plate 1, a support platform 2, a boiler body 3, an air inlet pipe 4, a burner connecting pipe 5, a connecting seat 6, a water chamber 7, a water interface 8, a vacuum pump 9, an explosion-proof component 10, a vacuum gauge 11, a water level sight glass 12, a temperature sensor 13, a smoke outlet 14 and a cooling component 15. A support platform 2 is arranged on the left side of the top of the bottom plate 1, and the inner side of the upper end of the support platform 2 is fixed to the bottom of the boiler body 3, and the lower end of the boiler body 3 is installed with An air inlet pipe 4 and a burner connecting pipe 5 and a smoke outlet 14 are respectively arranged on the left and right sides of the boiler body 3, a connecting seat 6 is installed in the middle of the top of the boiler body 3, water chambers 7 are respectively arranged on the left and right sides of the connecting seat 6, a water interface 8 is installed in the middle of the upper end of the water chamber 7, a vacuum pump 9 and an explosion-proof component 10 are respectively installed on the top of the connecting seat 6, a vacuum gauge 11, a water level sight glass 12 and a temperature sensor 13 are respectively connected to the front end of the connecting seat 6, and the left end of the cooling component 15 is connected to the smoke outlet 14.

[0032] Please refer to Figure 3 , 4, 5 and 6, this embodiment provides a condensing flue gas waste heat recovery steam boiler, the cooling assembly 15 includes a corrugated mesh 151, an inclined mesh 152, a reaction box 153, a support plate 154, a pipe seat 155, a connecting pipe 156, a fixed tube plate 157, a flue gas pipe 158, a filtering mechanism 159, a circulating water pipe 1510, a circulating water pump 1511, a water tank 1512 and a partition 1513, the corrugated mesh 151 is arranged on the inner side of the top end of the reaction box 153, the inclined mesh 152 is arranged on the upper side of the front end of the reaction box 153, and the support plate is installed on the lower side of the left end of the reaction box 153. 154, a tube seat 155 is installed on the left side of the top of the support plate 154, the inner side of the upper end of the tube seat 155 is fitted and connected with the lower side of the left end of the connecting tube 156, the middle part of the connecting tube 156 is fixed to the inner side of the left end of the fixed tube plate 157, the right end of the connecting tube 156 is connected to the left end of the flue gas pipe 158, the right end of the flue gas pipe 158 is connected to the upper side of the left end of the filter mechanism 159, the filter mechanism 159 is installed in the middle of the right end of the reaction box 153, the flue gas pipe 158 is arranged on the inner side of the circulating water pipe 1510, the right end of the circulating water pipe 1510 is connected to the output end of the circulating water pump 1511 The input end of the circulating water pump 1511 is connected to the right side of the inside of the water tank 1512. The water tank 1512 is arranged on the lower side of the inside of the reaction box 153. The partition 1513 is installed in the middle of the inner side of the reaction box 153. The lower side of the left end of the circulating water pipe 1510 passes through the inner side of the left end of the partition 1513 and is connected to the inner side of the water tank 1512. The left end of the smoke pipe 158 is connected to the smoke outlet 14. The inclined mesh 152 is provided with two groups and is oppositely distributed on the inner side of the front and rear ends of the reaction box 153. The corrugated mesh 151 is provided with multiple groups and is inclinedly arranged on the reaction box 1 The inner side of the top end of 53, thereby helping to improve the heat dissipation of the circulating water pipe 1510, and increasing the contact area and heat exchange effect with the flue gas by tilting the mesh 152, a circular notch is provided on the inner side of the upper end of the pipe seat 155 and the inner left side of the fixed tube plate 157, the size of the notch is consistent with the outer radius of the connecting pipe 156, thereby improving the stability of the semi-suspended setting of the connecting pipe 156, the circulating water pipes 1510 are serpentinely distributed on the upper side of the interior of the reaction box 153, and the flue gas pipes 158 are serpentinely distributed on the inner side of the circulating water pipe 1510, thereby reducing the loss of flue gas heat exchange energy.

[0033] Please refer to Figure 7The present embodiment provides a condensing flue gas waste heat recovery steam boiler, wherein the filter mechanism 159 comprises a filter box 1591, a filter water tank 1592, a movable baffle 1593 and an air outlet 1594. The filter box 1591 is provided with a filter water tank 1592 on the inner side, and the movable baffle 1593 is provided with an air outlet 1594 on the inner side. The filter box 1591 is installed at the middle of the right end of the reaction box 153, and the right end of the flue gas pipe 158 is connected to the upper left end of the filter box 1591, and the left end of the flue gas pipe 158 passes through the upper left end of the reaction box 153, and the left end of the flue gas pipe 158 is connected to the connecting pipe 156. The outlet end of the flue gas pipe 158 passes through the upper right half of the circulating water pipe 1510 and is connected to the left end of the filter box 1591, thereby improving the reuse rate of waste heat recovery. A circular hole is provided at the connection between the filter box 1591 and the reaction box 153. The size of the hole matches the right end of the flue gas pipe 158, so as to improve the accuracy of flue gas transportation. The top of the filter box 1591 is connected to the left end of the movable baffle 1593 through a movable shaft. A plurality of groups of air outlets 1594 are equidistantly distributed on the inner side of the movable baffle 1593, thereby playing a role in exhaust treatment of the flue gas and liquid.

[0034] The present invention provides a condensing flue gas waste heat recovery steam boiler through improvement, and its working principle is as follows;

[0035] First, the flue gas is sent into the inner side of the boiler body 3 through the air inlet pipe 4, and then the burner is connected through the burner connecting pipe 5 to heat the flue gas inside the boiler body 3;

[0036] Second, the smoke after combustion is transported to the connecting pipe 156 through the smoke outlet 14, and the connecting pipe 156 transports the smoke after combustion to the inside of the smoke pipe 158, and the smoke waste heat is recovered and reused through the smoke pipe 158;

[0037] Third, the circulating water pump 1511 at the bottom of the reaction box 153 extracts and transports the water in the water tank 1512, and transports the water in the water tank 1512 to the inside of the circulating water pipe 1510 through the circulating water pump 1511. The circulating water pipe 1510 is arranged in a serpentine shape, thereby increasing the contact surface with the outer side of the flue gas pipe 158, thereby indirectly increasing the reuse effect of cold water circulation heating;

[0038] Fourth, after the water in the circulating water pipe 1510 flows through the circulating water pipe 1510, it flows to the inside of the water tank 1512, and cooperates with the setting of the circulating water pipe 1510 and the circulating water pump 1511, which is conducive to increasing the cold water circulation heating reuse function and ensuring the waste heat reuse rate;

[0039] Fifth, two groups of inclined mesh sheets 152 are arranged on the upper sides of the front and rear ends of the reaction box 153, and the inclined mesh sheets 152 are vertically distributed in a stepped manner to assist in the heat dissipation of the flue gas waste heat recovery in the flue gas pipe 158 and the circulating water pipe 1510; and the wavy arrangement of the corrugated mesh sheet 151 on the inner side of the top of the reaction box 153 increases the contact area with the flue gas and indirectly helps improve the heat exchange effect of the flue gas;

[0040] Sixth, at this time, the waste heat flue gas inside the flue pipe 158 is transported to the left end connected to the filter box 1591, and the flue gas is transported to the filter water tank 1592 at the bottom of the inner side of the filter box 1591, and is filtered by the liquid inside the filter water tank 1592 and then discharged through the air outlet 1594 to improve the flue gas treatment. At the same time, the filtration of the liquid through the filter water tank 1592 is beneficial to the filtering treatment of the flue gas discharged by the gas boiler, which can avoid the pollution of the environment caused by improper flue gas treatment.

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A condensing flue gas waste heat recovery steam boiler, comprising a bottom plate (1), a support platform (2), a boiler body (3), an air inlet pipe (4), a burner connecting pipe (5), a connecting seat (6), a water chamber (7), a water interface (8), a vacuum pump (9), an explosion-proof component (10), a vacuum gauge (11), a water level sight glass (12), a temperature sensor (13) and a smoke outlet (14), wherein a support platform (2) is arranged on the left side of the top end of the bottom plate (1), the inner side of the upper end of the support platform (2) is fixed to the bottom of the boiler body (3), and the lower end of the boiler body (3) is fixed to the bottom of the boiler body (3). An air inlet pipe (4) is installed, a burner connecting pipe (5) and a smoke outlet (14) are respectively arranged on the left and right sides of the boiler body (3), a connecting seat (6) is installed in the middle of the top end of the boiler body (3), a water chamber (7) is respectively arranged on the left and right sides of the connecting seat (6), a water interface (8) is installed in the middle of the upper end of the water chamber (7), a vacuum pump (9) and an explosion-proof component (10) are respectively installed on the top of the connecting seat (6), and a vacuum gauge (11), a water level sight glass (12) and a temperature sensor (13) are respectively connected to the front end of the connecting seat (6); It is characterized in that The invention also comprises a cooling assembly (15), the left end of which is connected to the smoke outlet (14), and the cooling assembly (15) comprises a corrugated mesh sheet (151), an inclined mesh sheet (152), a reaction box (153), a support plate (154), a tube seat (155), a connecting pipe (156), a fixed tube sheet (157), a smoke pipe (158), a filtering mechanism (159), a circulating water pipe (1510), a circulating water pump (1511), a water tank (1512) and The partition (1513) is provided with a corrugated mesh sheet (151) on the inner side of the top end of the reaction box (153), an inclined mesh sheet (152) is provided on the upper side of the front end of the reaction box (153), a support plate (154) is installed on the lower side of the left end of the reaction box (153), a tube seat (155) is installed on the left side of the top end of the support plate (154), the inner side of the upper end of the tube seat (155) is fitted and connected with the lower side of the left end of the connecting tube (156), and the middle part of the connecting tube (156) is provided with a support plate (154) on the lower side of the left end of the connecting tube (156). The connecting pipe (156) is fixed to the inner side of the left end of the fixed tube plate (157), the right end of the connecting pipe (156) is connected to the left end of the smoke pipe (158), the right end of the smoke pipe (158) is connected to the upper side of the left end of the filtering mechanism (159), the filtering mechanism (159) is installed in the middle of the right end of the reaction box (153), the inner side of the circulating water pipe (1510) is provided with the smoke pipe (158), the right end of the circulating water pipe (1510) is connected to the output end of the circulating water pump (1511), and the circulating water pipe (1510) is connected to the output end of the circulating water pump (1511). The input end of the circulating water pump (1511) is connected to the right side of the inside of the water tank (1512); the water tank (1512) is arranged on the lower side of the inside of the reaction box (153); the partition (1513) is installed in the middle part of the inner side of the reaction box (153); the lower side of the left end of the circulating water pipe (1510) passes through the inner side of the left end of the partition (1513) and is connected to the inner side of the water tank (1512); the left end of the smoke pipe (158) is connected to the smoke outlet (14).

2. A condensing flue gas waste heat recovery steam boiler according to claim 1, characterized in that: The filtering mechanism (159) comprises a filtering box (1591), a filtering water tank (1592), a movable baffle (1593) and an air outlet (1594); the filtering water tank (1592) is arranged on the inner side of the filtering box (1591); the air outlet (1594) is arranged on the inner side of the movable baffle (1593); the filtering box (1591) is installed at the middle part of the right end of the reaction box (153); and the right end of the smoke pipe (158) is connected to the upper side of the left end of the filtering box (1591).

3. The condensing flue gas waste heat recovery steam boiler according to claim 1, characterized in that: The inclined mesh sheets (152) are provided in two groups and are arranged oppositely on the inner sides of the front and rear ends of the reaction box (153). The corrugated mesh sheets (151) are provided in multiple groups and are arranged obliquely on the inner side of the top end of the reaction box (153).

4. The condensing flue gas waste heat recovery steam boiler according to claim 1, characterized in that: A circular notch is provided on the inner side of the upper end of the tube seat (155) and the inner left side of the fixed tube plate (157), and the size of the notch is consistent with the outer radius of the connecting tube (156).

5. The condensing flue gas waste heat recovery steam boiler according to claim 1, characterized in that: The circulating water pipes (1510) are all arranged in a serpentine shape on the upper inner side of the reaction box (153), and the smoke pipes (158) are arranged in a serpentine shape on the inner side of the circulating water pipes (1510).

6. The condensing flue gas waste heat recovery steam boiler according to claim 2, characterized in that: The left end of the flue gas pipe (158) passes through the upper left side of the reaction box (153), and the left end of the flue gas pipe (158) is connected to the inner side of the right end of the connecting pipe (156). The gas outlet end of the flue gas pipe (158) passes through the upper right half of the inside of the circulating water pipe (1510) and is connected to the left end of the filter box (1591).

7. The condensing flue gas waste heat recovery steam boiler according to claim 2, characterized in that: A circular hole is provided at the connection between the filter box (1591) and the reaction box (153), and the size of the hole matches the right end of the smoke pipe (158).

8. The condensing flue gas waste heat recovery steam boiler according to claim 2, characterized in that: The top end of the filter box (1591) is connected to the left end of the movable baffle (1593) via a movable shaft, and a plurality of groups of air outlets (1594) are evenly spaced on the inner side of the movable baffle (1593).

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