Flue gas waste heat recovery device of gas-steam boiler

Abstract

The utility model discloses a flue gas waste heat recovery device of a gas-steam boiler, which relates to the technical field of flue gas waste heat recovery and comprises a heat exchange water tank, a waste heat recovery unit and a connection exhaust unit. The waste heat recovery unit comprises a gas collection bin, a sealing bearing, a heat conduction rotating shaft, a first metal impeller and a second metal impeller. Water is heated by absorbing heat of flue gas, so that heat in the flue gas of the boiler is recycled; the metal impellers can be driven to rotate by utilizing the rising effect of the smoke, the metal impeller II transmits heat to a water source in the heat exchange water tank, and meanwhile, the water source in the tank can be stirred, so that the temperature of the water source in the tank is uniformly increased; a reliable connection exhaust unit is further arranged, pipeline connection can be achieved, and exhaust control can be conducted on flue gas obtained after heat exchange; and the movable baffle can tend to be horizontal under the action of the torsional spring, so that the stability of the air pressure in the air collecting bin is maintained, the flue gas is prevented from dissipating too fast, and effective heat exchange is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas waste heat recovery, in particular to a flue gas waste heat recovery device for a gas steam boiler. Background Technique

[0002] Energy shortage is one of the problems that mankind needs to face together. In the field of production and manufacturing, the high-temperature flue gas discharged from various metallurgical furnaces often takes away 20-50% of the heat supply of the furnace. With the gradual development of energy-saving work, in order to further improve the thermal efficiency of the kiln and achieve the purpose of energy conservation and consumption reduction, recovering flue gas waste heat is also an important energy-saving way;

[0003] In the existing flue gas waste heat recovery device, the installation of the heat conduction component is relatively fixed. When absorbing heat to heat the water source, the water close to the heat conduction component has a high temperature, and the heating effect of the water far from the heat conduction component is poor, resulting in uneven temperature of the water in the tank, which is inconvenient for subsequent utilization; in addition, there is a lack of control over the residence time of the flue gas in the air chamber, and it is impossible to ensure the full heat exchange of the flue gas. For this reason, we propose a flue gas waste heat recovery device for a gas steam boiler. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a flue gas waste heat recovery device for a gas steam boiler, which has a reliable waste heat recovery unit to heat water by absorbing the heat of the flue gas, so as to realize the recovery of the heat in the boiler flue gas; and can utilize the rising effect of the flue gas to drive the metal impeller to rotate. The second metal impeller transfers heat to the water source in the heat exchange water tank, and at the same time will stir the water source in the tank to make the water source in the tank evenly heated; it also has a reliable connection and exhaust unit, which can realize the connection between the gas collecting chamber and the boiler exhaust pipe and control the discharge of the heat-exchanged flue gas; under the action of the torsion spring, the movable baffle can tend to be horizontal, so as to maintain the stability of the air pressure in the gas collecting chamber, prevent the introduced flue gas from escaping too quickly, and ensure the effective heat exchange, and can effectively solve the problems in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: A flue gas waste heat recovery device for a gas steam boiler, comprising a heat exchange water tank, a waste heat recovery unit and a connection and exhaust unit;

[0006] Heat exchange water tank: It is a cylindrical tank body, and four arc-shaped blocks are fixedly connected in a circumferential array at the lower end edge;

[0007] Waste heat recovery unit: It includes a gas collecting bin, a sealed bearing, a heat-conducting rotating shaft, a metal impeller I and a metal impeller II. The lower end of the heat exchange water tank is fixedly connected to the gas collecting bin, and the arc-shaped clamping block is clamped on the outside of the gas collecting bin. The center position of the bottom of the heat exchange water tank is fixedly connected to the sealed bearing. The heat-conducting rotating shaft is arranged vertically and passes through the inner ring of the sealed bearing. The heat-conducting rotating shaft remains fixedly connected to the inner ring of the sealed bearing. A metal impeller I is fixedly connected to the outer side of the lower section of the heat-conducting rotating shaft, and a metal impeller II is fixedly connected to the outer side of the upper section of the heat-conducting rotating shaft;

[0008] Connection and exhaust unit: It is installed at the lower end of the gas collecting bin.

[0009] The heat exchange water tank is used to store water source and conduct heat exchange. The arc-shaped clamping block is used to realize the clamping and fixing between the heat exchange water tank and the gas collecting bin. The flue gas rising from the steam boiler enters the gas collecting bin and acts on the bottom of the heat exchange water tank. The metal impeller I can rotate under the impact of the flue gas. The heat-conducting rotating shaft transmits heat and kinetic energy upward, driving the metal impeller II in the upper heat exchange water tank to rotate. The metal impeller II transfers heat to the water source in the heat exchange water tank and at the same time stirs the water source in the tank, so that the water source in the tank is evenly heated. The sealed bearing is used for the installation of the heat-conducting rotating shaft and has a good sealing effect. The connection and exhaust unit is used to realize the connection between the gas collecting bin and the boiler exhaust pipe and control the emission of the heat-exchanged flue gas.

[0010] Furthermore, the waste heat recovery unit further includes fixed heat-conducting shafts and heat-conducting rings. Six fixed heat-conducting shafts are fixedly connected to the bottom of the heat exchange water tank in a circumferential array. The fixed heat-conducting shafts are arranged vertically, and the middle section thereof is fixedly connected to the bottom of the hot water tank. Seven heat-conducting rings are fixedly connected to the outside of each fixed heat-conducting shaft in a linear array. The fixed heat-conducting shafts are also used for heat transfer. The circumferentially arrayed fixed heat-conducting shafts heat the internal water source from the outer end of the heat exchange water tank, further enhancing the heat transfer efficiency. The heat-conducting rings can increase the contact area with water and flue gas, thereby improving the heat absorption and transfer effect.

[0011] Furthermore, the connection and exhaust unit includes a socket pipe, an exhaust pipe and a connection block. The lower end of the gas collecting bin is fixedly connected to the exhaust pipe. The socket pipe is arranged vertically in the middle of the exhaust pipe. The socket pipe is fixedly connected to the inner wall of the exhaust pipe through five connection blocks arranged in a circumferential array on the outside. The connection block is used for the fixed connection between the socket pipe and the exhaust pipe. The socket pipe is used for connecting with the boiler flue gas pipe opening. The exhaust pipe is used for discharging the heat-exchanged flue gas. The flue gas that has lost temperature is squeezed downward and discharged downward from the exhaust pipe.

[0012] Further, the connecting and exhaust unit further includes a movable shaft, a movable baffle, and a torsion spring. A set of movable baffles is installed between every two adjacent connecting blocks. Each set of movable baffles includes two plate bodies, and the plate bodies are movably connected to the exhaust pipe and the socket pipe through the movable shaft. Two torsion springs are sleeved outside the movable shaft. One end of the torsion spring abuts against the lower side of the movable baffle, and the other end of the torsion spring is fixedly connected to the inside of the adjacent connecting block. When the flue gas after heat exchange passes downward through the gap between the connecting blocks, the gas will push open the movable baffle; under the action of the torsion spring, the movable baffle can tend to be horizontal, so as to maintain the stability of the air pressure in the air collection chamber, prevent the introduced flue gas from escaping too quickly, and ensure that the flue gas can effectively exchange heat in the air collection chamber.

[0013] Further, it further includes a temperature detector and a second detector. A temperature detector is installed at the front end of the heat exchange water tank, and a second detector is installed at the front end of the exhaust pipe. A display screen is provided at the front end of each detector. The detection end of the detector is arranged at the end opposite to the display screen, and the second detector has two detection heads, and the two detection heads respectively extend into the inside of the socket pipe and the exhaust pipe. The temperature detector is used to detect the temperature of the water in the heat exchange water tank, and the two detection heads of the second detector are respectively used to detect the temperature of the flue gas passing through the socket pipe and the exhaust pipe; the heating situation of the water temperature can be understood according to the display screen at the front end of the temperature detector, and the difference between the two temperature data detected by the second detector can help workers understand the effect of the flue gas waste heat recovery.

[0014] Further, it further includes a water outlet pipe, a water inlet pipe, and a check valve. A check valve is installed on the upper left side and the lower right side of the heat exchange water tank respectively. A horizontal water outlet pipe is fixedly connected to the check valve on the upper left side, and a horizontal water inlet pipe is fixedly connected to the check valve on the lower right side. Cold water is introduced into the heat exchange water tank through the water inlet pipe on the lower right side. The water temperature rises after heat exchange and is discharged outward through the water outlet pipe on the upper left side. The check valves on both sides are used to prevent the water from flowing back during the transportation process.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: The flue gas waste heat recovery device of the present gas steam boiler has the following advantages:

[0016] 1. It has a reliable waste heat recovery unit, which heats water by absorbing the heat of the flue gas, so as to recover the heat in the boiler flue gas; and it can utilize the rising effect of the flue gas to drive the metal impeller to rotate. The second metal impeller transfers the heat to the water source in the heat exchange water tank, and at the same time will stir the water source in the tank to make the water source in the tank evenly heated;

[0017] 2. It has a reliable connection and exhaust unit, which can realize the connection between the gas collecting bin and the boiler exhaust pipe and control the emission of the flue gas after heat exchange; under the action of the torsion spring, the movable baffle can tend to be horizontal, so as to maintain the stability of the air pressure in the gas collecting bin, prevent the introduced flue gas from escaping too quickly, and ensure that the flue gas can effectively exchange heat in the gas collecting bin;

[0018] 3. The utility model has a reliable waste heat recovery unit, which heats water by absorbing the heat of the flue gas, so as to realize the recovery of the heat in the boiler flue gas; moreover, it can utilize the rising action of the flue gas to drive the metal impeller to rotate. The second metal impeller transfers the heat to the water source in the heat exchange water tank, and at the same time will stir the water source in the tank to make the water source in the tank evenly heated; it also has a reliable connection and exhaust unit, which can realize the connection between the gas collecting bin and the boiler exhaust pipe and control the emission of the flue gas after heat exchange; under the action of the torsion spring, the movable baffle can tend to be horizontal, so as to maintain the stability of the air pressure in the gas collecting bin, prevent the introduced flue gas from escaping too quickly, and ensure the effective progress of heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the utility model;

[0020] Figure 2 It is a half-sectional view of the utility model;

[0021] Figure 3 It is a schematic structural diagram of the lower side of the utility model;

[0022] Figure 4 For the utility model Figure 3 The enlarged view of the structure at A in the utility model.

[0023] In the figure: 1 heat exchange water tank, 2 waste heat recovery unit, 21 gas collecting bin, 22 sealed bearing, 23 heat conduction rotating shaft, 24 first metal impeller, 25 second metal impeller, 26 fixed heat conduction shaft, 27 heat conduction ring, 3 connection and exhaust unit, 31 socket pipe, 32 exhaust pipe, 33 connection block, 34 movable shaft, 35 movable baffle, 36 torsion spring, 4 temperature detector, 5 second detector, 6 water outlet pipe, 7 water inlet pipe, 8 check valve, 9 arc-shaped clamping block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] Please refer to Figures 1 - 4, this embodiment provides a technical solution: a gas steam boiler flue gas waste heat recovery device, which includes a heat exchange water tank 1, a waste heat recovery unit 2, and a connecting exhaust unit 3;

[0026] Heat exchange water tank 1: It is a cylindrical tank body, and four arc-shaped clamping blocks 9 are fixedly connected in a circumferential array at the lower edge;

[0027] Waste heat recovery unit 2: It includes a gas collecting chamber 21, a sealed bearing 22, a heat-conducting rotating shaft 23, a metal impeller one 24, and a metal impeller two 25. The lower end of the heat exchange water tank 1 is fixedly connected with a gas collecting chamber 21. The arc-shaped clamping block 9 is clamped on the outside of the gas collecting chamber 21. A sealed bearing 22 is fixedly connected at the center position of the bottom of the heat exchange water tank 1. The heat-conducting rotating shaft 23 is arranged vertically and passes through the inner ring of the sealed bearing 22. The heat-conducting rotating shaft 23 maintains a fixed connection with the inner ring of the sealed bearing 22. A metal impeller one 24 is fixedly connected to the outer side of the lower section of the heat-conducting rotating shaft 23, and a metal impeller two 25 is fixedly connected to the outer side of the upper section of the heat-conducting rotating shaft 23;

[0028] Connecting exhaust unit 3: It is installed at the lower end of the gas collecting chamber 21.

[0029] The heat exchange water tank 1 is used to store water source and conduct heat exchange. The arc-shaped clamping block 9 is used to realize the clamping and fixing between the heat exchange water tank 1 and the gas collecting chamber 21. The flue gas rising from the steam boiler enters the gas collecting chamber 21 and acts on the bottom of the heat exchange water tank 1. The metal impeller one 24 can rotate under the impact of the flue gas. The heat-conducting rotating shaft 23 transmits heat and kinetic energy upward, driving the metal impeller two 25 in the upper heat exchange water tank 1 to rotate. The metal impeller two 25 transfers heat to the water source in the heat exchange water tank 1, and at the same time will stir the water source in the tank, so that the water source in the tank is evenly heated. The sealed bearing 22 is used for the installation of the heat-conducting rotating shaft 23 and has a good sealing effect. The connecting exhaust unit 3 is used to realize the connection between the gas collecting chamber 21 and the boiler exhaust pipe and control the discharge of the heat-exchanged flue gas.

[0030] The waste heat recovery unit 2 further includes a fixed heat-conducting shaft 26 and a heat-conducting ring 27. Six fixed heat-conducting shafts 26 are fixedly connected in a circumferential array at the bottom of the heat exchange water tank 1. The fixed heat-conducting shafts 26 are arranged vertically, and the middle section thereof is fixedly connected to the bottom of the hot water tank 1. Seven heat-conducting rings 27 are fixedly connected in a linear array on the outside of each fixed heat-conducting shaft 26. The fixed heat-conducting shaft 26 is also used for heat transfer. The circumferentially arranged fixed heat-conducting shafts 26 heat the internal water source from the outer end of the heat exchange water tank 1, further enhancing the heat transfer efficiency. The heat-conducting ring 27 can increase the contact area with water and flue gas, thereby improving the heat absorption and transfer effect.

[0031] The connection and exhaust unit 3 includes a socket pipe 31, an exhaust pipe 32, and a connection block 33. The lower end of the gas collecting chamber 21 is fixedly connected to the exhaust pipe 32. The socket pipe 31 is vertically arranged in the middle of the exhaust pipe 32. The socket pipe 31 is fixedly connected to the inner wall of the exhaust pipe 32 through five connection blocks 33 arranged in a circumferential array on the outside. The connection block 33 is used for the fixed connection between the socket pipe 31 and the exhaust pipe 32. The socket pipe 31 is used to connect to the boiler flue gas outlet. The exhaust pipe 32 is used to discharge the flue gas after heat exchange. The flue gas that has lost its temperature is squeezed downward and discharged downward from the exhaust pipe 32.

[0032] The connection and exhaust unit 3 further includes a movable shaft 34, a movable baffle 35, and a torsion spring 36. A set of movable baffles 35 is installed between every two adjacent connection blocks 33. Each set of movable baffles 35 includes two plate bodies, and the plate bodies are movably connected to the exhaust pipe 32 and the socket pipe 31 through the movable shaft 34. Two torsion springs 36 are sleeved on the outside of the movable shaft 34. One end of the torsion spring 36 abuts against the lower side of the movable baffle 35, and the other end of the torsion spring 36 is fixedly connected to the inside of the adjacent connection block 33. When the flue gas after heat exchange passes downward through the gap between the connection blocks 33, the gas will push open the movable baffle 35; under the action of the torsion spring 36, the movable baffle 35 can tend to be horizontal, so as to maintain the stability of the air pressure in the gas collecting chamber 21, prevent the introduced flue gas from escaping too quickly, and ensure that the flue gas can effectively exchange heat in the gas collecting chamber 21.

[0033] It further includes a temperature detector 4 and a detector 5. The temperature detector 4 is installed at the front end of the heat exchange water tank 1, and the detector 5 is installed at the front end of the exhaust pipe 32. A display screen is provided at the front end of each detector. The detection end of the detector is arranged at the end opposite to the display screen, and the detector 5 has two detection heads, and the two detection heads respectively extend into the inside of the socket pipe 31 and the exhaust pipe 32. The temperature detector 4 is used to detect the temperature of the water in the heat exchange water tank 1. The two detection heads of the detector 5 are respectively used to detect the temperature of the flue gas passing through the socket pipe 31 and the exhaust pipe 32; the heating situation of the water temperature can be understood according to the display screen at the front end of the temperature detector 4. The difference between the two temperature data detected by the detector 5 can help workers understand the effect of flue gas waste heat recovery.

[0034] It further includes a water outlet pipe 6, a water inlet pipe 7, and a check valve 8. A check valve 8 is installed on both the upper left side and the lower right side of the heat exchange water tank 1. A horizontal water outlet pipe 6 is fixedly connected to the check valve 8 on the upper left side, and a horizontal water inlet pipe 7 is fixedly connected to the check valve 8 on the lower right side. Cold water is introduced into the heat exchange water tank 1 through the water inlet pipe 7 on the lower right side. The water temperature rises after heat exchange and is discharged outward from the water outlet pipe 6 on the upper left side. The check valves 8 on both sides are used to prevent water from flowing back during transportation.

[0035] The working principle of a flue gas waste heat recovery device for a gas steam boiler provided by the utility model is as follows: This device has a reliable connection exhaust unit 3, which can realize the connection between the gas collecting bin 21 and the boiler exhaust pipe, and control the discharge of the flue gas after heat exchange. The socket pipe 31 is used to connect with the boiler flue gas pipe orifice, the connecting block 33 is used for the fixed connection between the socket pipe 31 and the exhaust pipe 32, and the arc-shaped clamping block 9 is used to realize the clamping and fixing between the heat exchange water tank 1 and the gas collecting bin 21. The flue gas rising from the steam boiler enters the gas collecting bin 21 and acts on the bottom of the heat exchange water tank 1. The heat exchange water tank 1 is used to store water and conduct heat exchange. When the flue gas after heat exchange passes downward through the gap between the connecting blocks 33, the gas will push open the movable baffle 35. Under the action of the torsion spring 36, the movable baffle 35 can tend to be horizontal, so as to maintain the stability of the air pressure in the gas collecting bin 21, prevent the introduced flue gas from escaping too quickly, and ensure that the flue gas can effectively conduct heat exchange in the gas collecting bin 21. It also has a reliable waste heat recovery unit 2. The metal impeller one 24 can rotate under the impact of the flue gas. The heat conduction rotating shaft 23 transmits heat and kinetic energy upward, driving the metal impeller two 25 in the upper heat exchange water tank 1 to rotate. The metal impeller two 25 transfers heat to the water source in the heat exchange water tank 1, and at the same time will stir the water source in the tank, so that the water source in the tank is evenly heated. The sealed bearing 22 is used for the installation of the heat conduction rotating shaft 23 and has a good sealing effect. The fixed heat conduction shaft 26 is also used for heat transfer. The circumferentially arrayed fixed heat conduction shafts 26 heat the internal water source from the outer end of the heat exchange water tank 1, further enhancing the heat transfer efficiency. The heat conduction ring 27 can increase the contact area with water and flue gas, thereby improving the heat absorption and transfer effect. In addition, the temperature detector 4 is used to detect the temperature of the water in the heat exchange water tank 1, and the two detection heads of the detector two 5 are respectively used to detect the temperature of the flue gas passing through the socket pipe 31 and the exhaust pipe 32. According to the display screen at the front end of the temperature detector 4, the situation of water temperature heating can be understood. By the difference between the two temperature data detected by the detector two 5, it can help workers understand the effect of flue gas waste heat recovery. Cold water is introduced into the heat exchange water tank 1 from the lower right side water inlet pipe 7. After heat exchange, the water temperature rises and is discharged outward from the upper left side water outlet pipe 6. The check valves 8 on both sides are used to prevent water from flowing back during transportation.

[0036] It should be noted that the heat conduction rotating shaft 23, the metal impeller one 24, the metal impeller two 25, the fixed heat conduction shaft 26 and the heat conduction ring 27 disclosed in the above embodiments are all made of aluminum with good heat conduction performance, and the temperature detector 4 and the detector two 5 are both powered by built-in power supplies.

[0037] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A flue gas waste heat recovery device for a gas steam boiler, characterized in that: It includes a heat exchange water tank (1), a waste heat recovery unit (2) and a connection exhaust unit (3); Heat exchange water tank (1): It is a cylindrical tank body, and four arc-shaped clamping blocks (9) are fixedly connected in a circumferential array at the lower edge; Waste heat recovery unit (2): It includes a gas collecting chamber (21), a sealed bearing (22), a heat-conducting rotating shaft (23), a metal impeller one (24) and a metal impeller two (25). The lower end of the heat exchange water tank (1) is fixedly connected with a gas collecting chamber (21), and the arc-shaped clamping blocks (9) are clamped on the outside of the gas collecting chamber (21). At the center position of the bottom of the heat exchange water tank (1), a sealed bearing (22) is fixedly connected. The heat-conducting rotating shaft (23) is arranged vertically and passes through the inner ring of the sealed bearing (22), and the heat-conducting rotating shaft (23) maintains a fixed connection with the inner ring of the sealed bearing (22). A metal impeller one (24) is fixedly connected to the outer side of the lower section of the heat-conducting rotating shaft (23), and a metal impeller two (25) is fixedly connected to the outer side of the upper section of the heat-conducting rotating shaft (23); Connection exhaust unit (3): It is installed at the lower end of the gas collecting chamber (21).

2. The flue gas waste heat recovery device of a gas steam boiler according to claim 1, characterized in that: The waste heat recovery unit (2) also includes a fixed heat-conducting shaft (26) and a heat-conducting ring (27). Six fixed heat-conducting shafts (26) are fixedly connected in a circumferential array at the bottom of the heat exchange water tank (1). The fixed heat-conducting shafts (26) are arranged vertically, and the middle section thereof is fixedly connected to the bottom of the water tank (1). Seven heat-conducting rings (27) are fixedly connected in a linear array on the outer side of each fixed heat-conducting shaft (26).

3. The flue gas waste heat recovery device for a gas steam boiler according to claim 1, characterized in that: The connection exhaust unit (3) includes a socket pipe (31), an exhaust pipe (32) and a connection block (33). The lower end of the gas collecting chamber (21) is fixedly connected with an exhaust pipe (32). The socket pipe (31) is arranged vertically in the middle of the exhaust pipe (32), and the socket pipe (31) is fixedly connected to the inner wall of the exhaust pipe (32) through five connection blocks (33) arranged in a circumferential array on the outside.

4. A flue gas waste heat recovery device for a gas steam boiler according to claim 3, characterized in that: The connection exhaust unit (3) also includes a movable shaft (34), a movable baffle (35) and a torsion spring (36). A set of movable baffles (35) is installed between every two adjacent connection blocks (33). Each set of movable baffles (35) includes two plate bodies, and the plate bodies are movably connected to the exhaust pipe (32) and the socket pipe (31) through a movable shaft (34). Two torsion springs (36) are sleeved on the outer side of the movable shaft (34). One end of the torsion spring (36) abuts against the lower side of the movable baffle (35), and the other end of the torsion spring (36) is fixedly connected to the inside of the adjacent connection block (33).

5. A flue gas waste heat recovery device for a gas steam boiler according to claim 1, characterized in that: It also includes a temperature detector (4) and a detector two (5). The temperature detector (4) is installed at the front end of the heat exchange water tank (1), and the detector two (5) is installed at the front end of the exhaust pipe (32). A display screen is provided at the front end of each detector. The detection end of the detector is arranged at the end opposite to the display screen, and the detector two (5) has two detection heads, and the two detection heads respectively extend into the inside of the socket pipe (31) and the exhaust pipe (32).

6. The flue gas waste heat recovery device for a gas steam boiler according to claim 1, wherein: It also includes a water outlet pipe (6), a water inlet pipe (7) and a check valve (8). A check valve (8) is installed on both the upper left side and the lower right side of the hot water exchange tank (1). A horizontal water outlet pipe (6) is fixedly connected to the check valve (8) on the upper left side, and a horizontal water inlet pipe (7) is fixedly connected to the check valve (8) on the lower right side.

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