A waste heat recovery device for heating hot water boilers

Abstract

This utility model discloses a waste heat recovery device for heating hot water boilers, relating to the field of hot water boiler technology. Addressing the problems of the prior art, such as the inability to ensure sufficient contact between waste heat and the heat exchange medium inside the heat collection tank, resulting in low heat exchange efficiency and the lack of treatment for residual natural gas in the flue gas, leading to natural gas leakage into the external environment and low practicality, the present invention proposes the following solution: It includes an insulated outer shell, comprising an insulated cylinder with flanges welded to both ends. A recovery mechanism is installed inside the insulated cylinder, comprising a heat collection cylinder and spiral guide vanes fixed to the outer wall of the heat collection cylinder. A heat exchange component is located at the lower part of the insulated cylinder. This utility model enables sufficient contact between the heat exchange medium and the recovered heat, preventing waste of recovered waste heat, improving heat exchange efficiency, and adsorbing unburned natural gas in the cooled flue gas, preventing natural gas leakage into the external environment, thus improving practicality.

Description

Technical Field

[0001] This utility model relates to the field of hot water boiler technology, and in particular to a waste heat recovery device for heating hot water boilers. Background Technology

[0002] Gas-fired hot water boilers are a type of hot water boiler. They use gas (such as natural gas, liquefied petroleum gas, city gas, biogas, etc.) as fuel and heat water through a burner to provide heating.

[0003] A search revealed a Chinese patent (application number "202020306565.3") disclosing "An Energy-Saving Waste Heat Recovery Device for a Gas-Fired Hot Water Boiler." This waste heat recovery device includes an insulation box, a bidirectional flue pipe, and a limiting cover. The insulation box comprises a shell and a heat collection chamber. The heat collection chamber is installed inside the shell and is fixedly connected to it. The bidirectional flue pipe is installed on the outer surface of the heat collection chamber and is fixedly connected to it. The limiting cover is installed at the head of the shell and is fixedly connected to it by bolts. However, the above-mentioned waste heat recovery device has the following problems during use:

[0004] 1. When utilizing the recovered waste heat, it is impossible to ensure that the waste heat is in full contact with the heat exchange medium inside the heat collection tank, resulting in low heat exchange efficiency.

[0005] 2. The natural gas remaining in the flue gas was not treated, causing the natural gas to escape into the external environment, resulting in low practicality. Utility Model Content

[0006] This utility model provides a waste heat recovery device for heating hot water boilers, which solves the problems of the waste heat recovery devices proposed in the prior art, which cannot ensure that the waste heat is in full contact with the heat exchange medium in the heat collection tank, resulting in low heat exchange efficiency, and do not treat the residual natural gas in the flue gas, causing natural gas to escape into the external environment, thus having low practicality.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A waste heat recovery device for heating hot water boilers includes an insulated outer shell, which includes an insulated cylinder with flanges welded to both ends. A recovery mechanism is provided inside the insulated cylinder, comprising a heat collection cylinder and spiral guide vanes fixed to the outer wall of the heat collection cylinder. A heat exchange assembly is provided at the lower part of the insulated cylinder, comprising a mounting plate bolted to the inner wall of the lower part of the heat collection cylinder and several heat pipes, the lower parts of which penetrate and are fixed to the outer wall of the bottom of the heat collection cylinder. A heat conduction assembly is provided inside the heat collection cylinder, comprising several heat conduction plates fixed to the outer wall of the top of the mounting plate and several frustum-shaped connecting plates. A purification mechanism is provided on one side of the insulated cylinder, comprising a mounting box, a purification chamber with equidistantly distributed ventilation holes on the bottom outer wall, and an exhaust plate bolted to the outer wall of the top of the mounting box.

[0009] Preferably, an upper end cover is connected to the outer wall of the top of the insulation cylinder via a flange, and a smoke inlet pipe is fixed on the inner wall of one side of the insulation cylinder located below the upper end cover. A lower end cover is connected to the outer wall of the bottom of the insulation cylinder via a flange.

[0010] Preferably, the heat collection cylinder is bolted to the outer wall of the bottom of the upper end cover, and a water inlet pipe is fixed on the inner wall of the top of the heat collection cylinder. The water inlet pipe passes through and is sleeved on the outer wall of the upper end cover. The guide plate abuts against the inner wall of the heat insulation cylinder. A drain pipe is fixed on the inner wall of the bottom of the heat collection cylinder. The drain pipe passes through and is sleeved on the outer wall of the lower end cover. A drain valve is screwed onto the outer wall of the bottom end of the drain pipe.

[0011] Preferably, a connecting pipe is fixedly provided on the lower inner wall of one side of the heat preservation cylinder, and a pressure relief valve is screwed onto the outer wall of one end of the connecting pipe.

[0012] Preferably, a through hole is formed on the outer wall of the middle part of the mounting plate, and the upper parts of several heat pipes are respectively inserted through and fixed on the outer wall of the mounting plate.

[0013] Preferably, each of the connecting plates has a drain outlet on its outer wall and a number of drain holes on its outer wall, and the heat-conducting plates are respectively inserted through and fixed on the outer walls of the connecting plates.

[0014] The above scheme involves transporting the flue gas generated during combustion of the gas-fired hot water boiler through the flue pipe to the space between the insulation cylinder and the heat collection cylinder. Under the action of the spiral guide vanes, the flue gas spirals downwards, while exchanging heat with the heat collection cylinder. The flue gas enters the lower part of the insulation cylinder and comes into contact with multiple heat pipes. The heat pipes transfer heat to the heat exchange medium inside the heat collection cylinder. The heat conduction plate and connecting plate transfer the heat from the upper part of the heat pipes to the upper part of the heat collection cylinder, causing the heat exchange medium inside the heat collection cylinder to heat up rapidly.

[0015] Preferably, the mounting box is connected to the outer wall of one end of the pressure relief valve via a connecting pipe, and a fixing groove is opened on the top outer wall of the mounting box. The two outer walls on the top sides of the purification box are fixed with clamping plates, and the two clamping plates abut against the two fixing grooves respectively. The purification box is connected to the bottom outer wall of the exhaust plate by bolts.

[0016] The above scheme uses a pressure relief valve to transport the cooled flue gas from the bottom of the insulation cylinder into the installation box. The flue gas then enters the purification box through multiple ventilation holes. The activated carbon particles in the purification box adsorb any unburned natural gas that may be present in the flue gas, and then the adsorbed flue gas is discharged into the external environment.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The flue gas inlet pipe transports the flue gas generated during combustion in the gas-fired hot water boiler to the space between the insulation cylinder and the heat collection cylinder. Under the action of the spiral guide vanes, the flue gas spirals downwards, while exchanging heat with the heat collection cylinder. The flue gas enters the lower part of the insulation cylinder and comes into contact with multiple heat pipes. The heat pipes transfer heat to the heat exchange medium inside the heat collection cylinder. The heat conduction plate and connecting plate transfer the heat from the upper part of the heat pipes to the upper part of the heat collection cylinder, causing the heat exchange medium inside the heat collection cylinder to heat up rapidly. This allows the heat exchange medium to fully contact the recovered heat, preventing the waste of recovered waste heat and improving heat exchange efficiency.

[0019] 2. The pressure relief valve delivers the cooled flue gas from the bottom of the insulation cylinder to the installation box. The flue gas enters the purification box through multiple ventilation holes. The activated carbon particles in the purification box adsorb any unburned natural gas that may be present in the flue gas. The adsorbed flue gas is then discharged into the external environment. This process adsorbs unburned natural gas in the cooled flue gas, preventing natural gas from escaping into the external environment and improving practicality.

[0020] In summary, this invention enables the heat exchange medium to fully contact the recovered heat, preventing the waste of recovered heat and improving heat exchange efficiency. It can also adsorb unburned natural gas in the cooled flue gas, preventing natural gas from escaping into the external environment, thus improving its practicality. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall main structure of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0022] Figure 2 This is a schematic diagram of the main cross-sectional structure of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0023] Figure 3This is a schematic diagram of the main view cross-sectional structure of the heat insulation shell of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0024] Figure 4 This is a front view cross-sectional structural diagram of the waste heat recovery mechanism of a heating hot water boiler waste heat recovery device proposed in this utility model.

[0025] Figure 5 This is a schematic diagram of the main structure of the heat exchange component of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0026] Figure 6 This is a schematic diagram of the main structure of the heat-conducting component of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0027] Figure 7 This is a schematic diagram of the main structure of the purification mechanism of a waste heat recovery device for a heating hot water boiler proposed in this utility model.

[0028] In the diagram: 1. Insulation shell; 101. Insulation cylinder; 102. Upper end cover; 103. Smoke inlet pipe; 104. Lower end cover; 2. Recovery mechanism; 201. Heat collection cylinder; 202. Water inlet pipe; 203. Guide vane; 204. Drain pipe; 3. Connecting pipe; 4. Heat exchange assembly; 401. Mounting plate; 402. Heat pipe; 5. Heat conduction assembly; 501. Heat conduction plate; 502. Connecting plate; 6. Purification mechanism; 601. Mounting box; 602. Purification box; 603. Exhaust plate. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Example 1, referring to Figure 1-6A waste heat recovery device for a heating hot water boiler includes an insulated outer shell 1, which includes an insulated cylinder 101 with flanges welded to both ends. An upper end cover 102 is connected to the top outer wall of the insulated cylinder 101 via a flange. A flue gas inlet pipe 103 is fixed to the inner wall of one side of the insulated cylinder 101 below the upper end cover 102. A lower end cover 104 is connected to the bottom outer wall of the insulated cylinder 101 via a flange. A recovery mechanism 2 is provided inside the insulated cylinder 101. Component 2 includes a heat collection cylinder 201 and a spiral guide vane 203 fixed to the outer wall of the heat collection cylinder 201. The heat collection cylinder 201 is bolted to the bottom outer wall of the upper end cover 102. A water inlet pipe 202 is fixed to the top inner wall of the heat collection cylinder 201, passing through and sleeved on the outer wall of the upper end cover 102. The guide vane 203 abuts against the inner wall of the heat insulation cylinder 101. A drain pipe 204 is fixed to the bottom inner wall of the heat collection cylinder 201. A drain pipe 204 is threaded onto the outer wall of the lower end cover 104 and a drain valve is screwed onto the outer wall of the bottom end of the drain pipe 204. A heat exchange assembly 4 is located at the lower part of the insulation cylinder 101. The heat exchange assembly 4 includes a mounting plate 401 bolted to the inner wall of the lower part of the heat collection cylinder 201 and several heat pipes 402, the lower parts of which are respectively threaded through and fixed to the outer wall of the bottom of the heat collection cylinder 201. A through hole is opened on the outer wall of the middle part of the mounting plate 401, and the upper parts of the several heat pipes 402 are respectively threaded through and fixed to the outer wall of the bottom of the heat collection cylinder 201. On the outer wall of the mounting plate 401, a heat-conducting component 5 is provided inside the heat-collecting cylinder 201. The heat-conducting component 5 includes several heat-conducting plates 501 respectively fixed on the top outer wall of the mounting plate 401 and several frustoconical connecting plates 502. Drainage outlets are opened on the outer walls of the middle of the several connecting plates 502, and several drainage holes are opened on the outer walls of the several connecting plates 502. The several heat-conducting plates 501 are respectively penetrated and fixed on the outer walls of the several connecting plates 502.

[0031] Example 2, refer to Figure 7 A waste heat recovery device for heating hot water boilers also includes a purification mechanism 6. A connecting pipe 3 is fixed on the lower inner wall of one side of the insulation cylinder 101, and a pressure relief valve is screwed onto the outer wall of one end of the connecting pipe 3. The purification mechanism 6 includes an installation box 601, a purification box 602 with equally spaced ventilation holes on the bottom outer wall, and an exhaust plate 603 bolted to the top outer wall of the installation box 601. The installation box 601 is connected to the outer wall of one end of the pressure relief valve through the connecting pipe. A fixing groove is opened on the top outer wall of the installation box 601. A clamping plate is fixed on both sides of the top outer wall of the purification box 602, and the two clamping plates abut against the two fixing grooves respectively. The purification box 602 is bolted to the bottom outer wall of the exhaust plate 603.

[0032] Working principle: The flue gas generated during combustion of the gas-fired hot water boiler is transported by the flue gas inlet pipe 103 to the space between the insulation cylinder 101 and the heat collection cylinder 201. Under the action of the spiral guide vanes 203, the flue gas spirals down and exchanges heat with the heat collection cylinder 201. The flue gas enters the lower part of the insulation cylinder 101 and comes into contact with the heat pipe 402. The heat pipe 402 transfers heat to the heat exchange medium inside the heat collection cylinder 201. The heat conduction plate 501 and the connecting plate 502 transfer the heat from the upper part of the heat pipe 402 to the upper part of the heat collection cylinder 201, causing the heat exchange medium inside the heat collection cylinder 201 to heat up rapidly. The pressure relief valve transports the cooled flue gas from the lower part of the insulation cylinder 101 to the installation box 601. The flue gas enters the purification box 602 through multiple ventilation holes. The activated carbon particles in the purification box 602 adsorb any unburned natural gas that may be present in the flue gas. The adsorbed flue gas is then discharged into the external environment.

[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A waste heat recovery device for a heating water boiler, comprising an insulating casing (1), characterized in that, The heat-insulating outer shell (1) includes a heat-insulating cylinder (101) with flanges welded to both ends; The heat preservation cylinder (101) is provided with a recycling mechanism (2), which includes a heat collection cylinder (201) and a spiral guide vane (203) fixed on the outer wall of the heat collection cylinder (201); The heat exchange assembly (4) is provided at the lower part of the heat insulation cylinder (101). The heat exchange assembly (4) includes a mounting plate (401) that is bolted to the inner wall of the lower part of the heat collection cylinder (201) and several heat pipes (402) that are respectively inserted through and fixed to the outer wall of the bottom of the heat collection cylinder (201). The heat collection cylinder (201) is provided with a heat conduction component (5), which includes several heat conduction plates (501) respectively fixed on the top outer wall of the mounting plate (401) and several frustum-shaped connecting plates (502); The heat preservation cylinder (101) is provided with a purification mechanism (6) on one side. The purification mechanism (6) includes a mounting box (601), a purification box (602) with equidistantly distributed ventilation holes on the bottom outer wall, and an exhaust plate (603) that is bolted to the top outer wall of the mounting box (601).

2. The device according to claim 1, characterized in that, The top outer wall of the insulation cylinder (101) is connected to an upper end cover (102) via a flange, and a smoke inlet pipe (103) is fixed on the inner wall of the insulation cylinder (101) located below the upper end cover (102). The bottom outer wall of the insulation cylinder (101) is connected to a lower end cover (104) via a flange.

3. The device according to claim 2, characterized in that, The heat collection cylinder (201) is bolted to the bottom outer wall of the upper end cover (102), and a water inlet pipe (202) is fixed on the top inner wall of the heat collection cylinder (201). The water inlet pipe (202) passes through and is sleeved on the outer wall of the upper end cover (102). The guide plate (203) abuts against the inner wall of the heat insulation cylinder (101). A drain pipe (204) is fixed on the bottom inner wall of the heat collection cylinder (201), and the drain pipe (204) passes through and is sleeved on the outer wall of the lower end cover (104). A drain valve is screwed onto the bottom outer wall of the drain pipe (204).

4. The device according to claim 1, wherein A connecting pipe (3) is fixedly installed on the lower inner wall of one side of the heat insulation cylinder (101), and a pressure relief valve is screwed onto the outer wall of one end of the connecting pipe (3).

5. The device according to claim 1, wherein The mounting plate (401) has a through hole on its outer wall in the middle, and the upper parts of several heat pipes (402) are respectively inserted through and fixed on the outer wall of the mounting plate (401).

6. The device according to claim 1, wherein Each of the connecting plates (502) has a drain outlet on its outer wall and a number of drain holes on its outer wall. The heat-conducting plates (501) are respectively inserted through and fixed on the outer wall of the connecting plates (502).

7. The device according to claim 4, wherein The mounting box (601) is connected to the outer wall of one end of the pressure relief valve through a connecting pipe, and a fixing groove is opened on the top outer wall of the mounting box (601). The top two outer walls of the purification box (602) are fixed with clamping plates, and the two clamping plates abut against the two fixing grooves respectively. The purification box (602) is connected to the bottom outer wall of the exhaust plate (603) by bolts.

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