CN201507916U - A boiler flue gas heat energy recovery device - Google Patents

Abstract

The utility model discloses a boiler flue gas heat energy recovery device, which provides a boiler flue gas heat energy recovery device with simple structure, low cost, high heat energy recovery rate and good use effect. It includes a boiler exhaust pipe, which is characterized in that the boiler exhaust pipe is connected with the smoke inlet on the water tank, and the smoke inlet is connected with one end of the heat exchange pipe arranged in the water tank, and the heat exchange The other end of the pipe is connected to the smoke outlet on the wall of the water tank, and the water tank is provided with a water inlet and a water outlet, the water inlet is connected to a normal temperature water source, and the water outlet is connected to the boiler return pipe or The drain valve is connected, and at least one section of the heat exchange pipeline is arranged under the liquid level in the water tank.

Description

A boiler flue gas heat energy recovery device

technical field

The utility model relates to a boiler flue gas processing device, in particular to a boiler flue gas heat energy recovery device.

Background technique

Boilers are widely used in daily life, and boilers often produce a lot of flue gas during use. The temperature of the flue gas is generally between 160°C and 220°C, so the flue gas carries a lot of energy. If Discharging the flue gas directly into the atmosphere is not only not conducive to environmental protection, but also wastes the heat energy in the flue gas.

Chinese patent: "Boiler flue heat recovery device (CN2864389Y)" discloses a boiler flue heat recovery device, which includes valves, shells, circulating water pipes, heat preservation pads, drain valves and flanges, and is characterized in that The internal cavity is provided with a circulating water pipe, and the water inlet and outlet of the circulating water pipe are respectively connected with the water inlet valve and the water outlet valve, and the flue gas inlet connected with the exhaust pipe of the boiler and the flue gas outlet connected with the induced draft fan are set in the shell , the flue gas inlet and the flue gas outlet are arranged diagonally, and an insulating pad is set between the two sets of shells. This device installs a shell on the flue of the boiler, and sets a circulating water pipe in the shell. When the high-temperature flue gas flows through the shell, it exchanges heat with the water in the circulating water pipe. The temperature of the water rises and the temperature of the flue gas decreases. In order to achieve the purpose of recovering the heat in the flue gas, but the heat exchange circulating water pipe in this structure is set in the shell connected with the flue of the boiler, and the heat in the flue gas is absorbed by the water in the circulating water pipe. The external environment where the shell is located produces heat exchange, and an insulation pad is installed on the shell, thereby increasing the cost of the recycling device, and the heat exchange between the shell and the external environment where the shell is located makes the recovery rate of the device low ,poor effect.

Contents of the invention

The utility model mainly provides a boiler flue gas heat energy recovery device with simple structure, low cost, high heat energy recovery rate and good use effect. The technical problems of the high cost of the recovery device, low heat energy recovery rate and poor use effect existing in the prior art are solved.

The above-mentioned technical problems of the utility model are mainly solved by the following technical solutions: a boiler flue gas heat energy recovery device, including a boiler smoke exhaust pipe, the boiler smoke exhaust pipe is connected with the smoke inlet on the water tank, the The smoke inlet described above is connected with one end of the heat exchange pipe arranged in the water tank, the other end of the heat exchange pipe is connected with the smoke outlet arranged on the wall of the water tank, and the water tank is provided with a water inlet and The water inlet is connected to the normal temperature water source, the water outlet is connected to the boiler return pipe or the drain valve, and at least one section of the heat exchange pipe is arranged under the liquid level in the water tank. Through the connection between the boiler exhaust pipe and the heat exchange pipe in the water tank, the flue gas in the boiler exhaust pipe flows through the heat exchange pipe from the smoke inlet to exchange heat with the water stored in the water tank, and the water in the water tank absorbs heat After the temperature rises, although the water temperature in the water tank has increased relative to the ambient temperature, the temperature difference between it and the surrounding environment is much smaller than the temperature difference between the boiler exhaust pipe and the surrounding environment. Insulation layer is installed on the periphery of the tank, the structure is simple, the cost is low, and the heat energy recovery rate is high; and the water inlet and the drain are respectively connected to the normal temperature water source and the boiler return pipe or the drain valve on the water tank, so that the water in the water tank After heat exchange with the heat exchange pipe, it is connected to the boiler return pipe or drain valve through the drain port to realize energy recycling, and the water tank is continuously replenished with normal temperature water through the water inlet. The heat recovery rate is high and the use effect is good.

Preferably, the water tank is a closed water tank. The closed water tank can reduce the heat loss of the water in the water tank, thereby reducing energy loss and improving the utilization rate of heat energy recovery.

More preferably, the ratio of the height of the liquid level in the water tank to the height of the water tank is between 1:2 and 4:5. When the amount of water in the water tank is between 50% and 80% of the volume of the water tank, while ensuring the utilization rate of the water tank, it can also ensure that the water tank will not burst due to volume expansion when the water temperature rises, thereby causing safety accidents.

As more preferably, a pressure gauge and a safety valve are arranged on the top surface of the water tank, and a water level gauge and a manhole are arranged on the side. By setting pressure gauges, safety valves and water level gauges on the top or side of the water tank, the pressure and water level in the water tank can be monitored in real time, and when the pressure exceeds the safe value, it can be unloaded through the safety valve to improve the safety and reliability of use; Manholes are set on the side of the water tank, which can facilitate the entry and exit of maintenance personnel when internal cleaning or maintenance is required, thus making daily maintenance and maintenance more convenient.

Preferably, the heat exchange pipe is an integral component composed of two to ten U-shaped exhaust pipes connected in series. The heat exchange pipe is combined in series by setting multiple U-shaped exhaust pipes, which can increase the contact area between the heat exchange pipe and the heat exchange water in the water tank, fully absorb the heat in the boiler flue gas, improve the heat recovery rate, The outlet is connected with the induced draft fan to reduce the wind resistance of the flue and ensure the smooth discharge of the boiler flue gas; the integrated structure in series has a simple structure, low cost and easy installation.

As a preference, the heat exchange pipe is composed of two to ten U-shaped smoke exhaust pipes connected in parallel, one side open end of the U-shaped smoke exhaust pipe is connected to the smoke inlet through the smoke inlet chamber, and the other side is opened The end is connected to the smoke outlet through the smoke exhaust chamber. The heat exchange pipe can increase the contact area between the heat exchange pipe and the heat exchange water in the water tank by setting multiple U-shaped smoke exhaust pipes in parallel, so that the heat in the flue gas can be fully absorbed and the heat recovery rate can be improved; U-shaped smoke exhaust The pipe adopts a parallel split structure, which has high space utilization rate, simple structure, and is convenient for use and maintenance.

As more preferably, the U-shaped smoke exhaust pipes are arranged in the middle of the water tank, and are distributed parallel and equidistant between the inner walls of the water tank. When the U-shaped smoke exhaust pipes are distributed in parallel and equidistant in the middle of the water tank, each U-shaped smoke exhaust pipe can The pipe maintains a balanced heat exchange with the water in the water tank, so that the temperature of the water in the water tank rises evenly and the recovery effect is good.

As more preferably, the opening end of the U-shaped smoke exhaust pipe is upward, and the open end surface of the U-shaped smoke exhaust pipe is set above the liquid level of the water tank, and a partition is clamped between the inner walls of the water tank, and the The openings on both sides of the U-shaped smoke exhaust pipe are symmetrically arranged on both sides of the partition, the upper end surface of the partition abuts against the upper top surface of the water tank, and the lower end surface abuts against the bottom of the groove of the U-shaped smoke exhaust pipe . By setting the open end of the U-shaped smoke exhaust pipe upward on the liquid surface of the water tank, and passing through the partition between the open ends on both sides, the space where the open ends of the U-shaped smoke exhaust pipe is located can be divided into two parts. It is an independent space, the smoke inlet is connected to the smoke inlet, and the smoke exhaust chamber is connected to the smoke outlet, so there is no need to make a special smoke inlet and exhaust chamber, which simplifies the structure, saves costs, and is convenient for use and maintenance. ;By contacting the bottom of the U-shaped smoke exhaust pipe groove through the partition, the U-shaped smoke exhaust pipe can be positioned to prevent the U-shaped smoke exhaust pipe from rising or tilting under the buoyancy of the water. The fixing method is simple and reliable. low cost.

Preferably, the water inlet is arranged on the top surface of the water tank; the water outlet is arranged on the bottom or the side of the bottom of the water tank. By setting the water inlet on the top surface of the water tank, the normal temperature water can be quickly injected into the water tank under low pressure, which improves the work efficiency, and after fully contacting the heat exchange pipe from top to bottom, it is installed at the bottom or bottom of the water tank The drain port on the side quickly releases the temperature-rising water in the water tank according to the pressure at the drain port, so as to improve the working efficiency and at the same time ensure that the water released from the drain port has fully exchanged heat with the heat exchange pipe, thereby The heat recovery effect is guaranteed.

Preferably, the inner bottom surface of the water tank is a slope, the inclination angle of the inner bottom surface relative to the horizontal plane is 2° to 5°, and a drain valve is provided on the side of the water tank adjacent to the lowest point of the inner bottom surface. By setting the inner bottom surface of the water tank as a slope of 2° to 5°, while ensuring the use effect, the sediment in the water can be collected at the lowest point of the inner bottom surface of the water tank, and pass through the bottom adjacent to the lowest point of the inner bottom surface. A drain valve is installed on the side of the water tank to discharge the impurities in the water tank at any time to keep the water clean, improve the heat exchange effect of the boiler or the device for return flow, and increase the heat recovery rate.

Therefore, a boiler flue gas heat energy recovery device of the utility model has the following advantages: through the connection between the boiler exhaust pipe and the heat exchange pipe in the water tank, the flue gas flowing through the heat exchange pipe can exchange heat with the water in the water tank , absorb the heat of the flue gas, the heat loss of the flue gas is small, and there is no need to install an insulation layer around the water tank, the structure is simple, the cost is low, and the heat energy recovery rate is high; The contact area between the exchange pipe and the heat exchange water in the water tank can improve the heat energy recovery rate; by setting the open end of the parallel U-shaped smoke exhaust pipe upward on the liquid level of the water tank, and passing through the partition between the open ends The space where the open ends on both sides are located is divided into a smoke inlet room and a smoke exhaust room, and there is no need to make a special smoke inlet room and a smoke exhaust room, which simplifies the structure, saves costs, and is convenient for use and maintenance; by setting the inner bottom surface of the water tank as The slope of 2° to 5° allows the sediment in the water to be discharged from the water tank smoothly at any time through the drain valve to keep the water clean and ensure the heat exchange effect of the return boiler or device.

Description of drawings:

Fig. 1 is a schematic structural view of the first embodiment of the utility model.

Fig. 2 is a schematic structural view of the second embodiment of the utility model.

Fig. 3 is an A-A view of Fig. 2 .

Detailed ways:

The technical solutions of the present utility model will be further specifically described below through the embodiments and in conjunction with the accompanying drawings.

Example 1:

As shown in Figure 1, a boiler flue gas heat energy recovery device of the present utility model comprises a boiler exhaust pipe 1 connected to the boiler 20, and the boiler exhaust pipe 1 passes through the smoke inlet 18 on the top surface of the closed water tank 2 and The heat exchange pipes 7 inside the water tank 2 are connected to each other. The heat exchange pipe 7 is an integrated component composed of three U-shaped smoke exhaust pipes 8 connected in series, one end of which is connected to the boiler smoke exhaust pipe 1 through the smoke inlet 18 on the water tank 2, and the other end is connected to the top surface of the water tank 2. The induced draft fan 22 at the smoke outlet 19 is connected, the top surface of the water tank 2 is provided with a water inlet 3, the water inlet 3 is connected with a normal temperature water source, and the bottom side of the water tank 2 is provided with a drain port 4, and the drain port 4 is connected to the drain The valve 6 is connected, the height of the liquid level 17 in the water tank 2 is four-fifths of the height of the water tank 2, three U-shaped smoke exhaust pipes 8 connected in series are immersed under the liquid level 17, and a pressure gauge is installed on the top surface of the water tank 2 12 and safety valve 13, water level gauge 14 and manhole 21 are equipped with on the side, and the inside bottom surface 15 of water tank 2 is an inclined plane with an included angle of 3° with the horizontal plane, and the side of water tank 2 adjacent to the lowest point of the inclined plane is equipped with a sewage discharge valve. valve 16.

Example 2:

As shown in Figures 2 and 3, the heat exchange pipes 7 are five U-shaped smoke exhaust pipes 8 with their open ends upward, and the five U-shaped smoke exhaust pipes 8 are equidistantly distributed in parallel in the middle of the water tank 2, and the U-shaped smoke exhaust pipes The open end face of 8 is on the liquid surface 17 of water tank 2, and clapboard 11 is clamped between the inner walls of both sides of water tank 2, and the open end of both sides of U-shaped smoke exhaust pipe 8 is symmetrically arranged on the both sides of clapboard 11, and divider The upper end surface of the plate 11 abuts against the top surface of the water tank 2, and the lower end surface abuts against the bottom of the groove of the U-shaped smoke exhaust pipe 8, and the space of the water tank 2 above the liquid level 17 of the partition plate 11 is divided into two parts, and The smoke inlet chamber 9 connected to the smoke inlet 18 and the smoke exhaust chamber 10 connected to the smoke outlet 19, one side opening end of five parallel U-shaped smoke exhaust pipes 8 pass through the smoke inlet chamber 9 and the smoke inlet on the water tank 2 The open end on the other side communicates with the smoke outlet 19 on the top surface of the water tank 2 through the smoke exhaust chamber 10, and the drain port 4 on the water tank 2 is connected with the boiler return pipe 5, and the rest is the same as in embodiment 1.

The specific embodiments described herein are only examples to illustrate the concept of the present utility model. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (10)

1. A boiler flue gas heat energy recovery device, comprising a boiler smoke exhaust pipe, characterized in that said boiler smoke exhaust pipe (1) is connected to the smoke inlet (18) on the water tank (2), and said smoke inlet The mouth (18) is connected with one end of the heat exchange pipe (7) arranged in the water tank (2), and the other end of the heat exchange pipe (7) is connected with the smoke outlet (19) arranged on the wall of the water tank (2). ) are connected; the water tank (2) is provided with a water inlet (3) and a water outlet (4), the water inlet (3) is connected to a normal temperature water source, and the water outlet (4) is connected to the boiler return The water pipe (5) or the drain valve (6) are connected; at least one section of the heat exchange pipe (7) is arranged under the liquid surface (17) in the water tank (2). 2. A boiler flue gas heat recovery device according to claim 1, characterized in that the water tank (2) is a closed water tank. 3. A boiler flue gas heat energy recovery device according to claim 2, characterized in that the ratio of the height of the liquid surface (17) in the water tank (2) to the height of the water tank (2) is 1:2 to 4: between 5. 4. A boiler flue gas heat energy recovery device according to claim 2, characterized in that a pressure gauge (12) and a safety valve (13) are provided on the top surface of the water tank (2), and a water level is provided on the side. Table (14) and manhole (21). 5. A boiler flue gas heat energy recovery device according to any one of claims 1 to 4, characterized in that the heat exchange pipe (7) is two to ten U-shaped exhaust pipes (8) connected in series The one-piece member formed has one side open end connected to the smoke inlet (18), and the other side open end connected to the induced draft fan (22) at the smoke outlet (19). 6. A boiler flue gas heat energy recovery device according to any one of claims 1 to 4, characterized in that the heat exchange pipe (7) is two to ten U-shaped exhaust pipes (8) connected in parallel One side open end of the U-shaped smoke exhaust pipe (8) is connected with the smoke inlet (18) through the smoke inlet chamber (9), and the other side open end is connected with the smoke outlet through the smoke exhaust chamber (10). Mouth (19) links to each other. 7. A boiler flue gas heat energy recovery device according to claim 6, characterized in that said U-shaped smoke exhaust pipe (8) is arranged in the middle of the water tank (2), and between the inner walls of the water tank (2) Parallel equidistant distribution. 8. A boiler flue gas heat energy recovery device according to claim 7, characterized in that the opening end of the U-shaped smoke exhaust pipe (8) is upward, and the opening end of the U-shaped smoke exhaust pipe (8) is set Above the liquid level (17) of the water tank (2), a partition (11) is clamped between the inner walls of the water tank (2), and the openings on both sides of the U-shaped smoke exhaust pipe (8) are symmetrical Located on both sides of the partition (11), the upper end surface of the partition (11) abuts against the upper top surface of the water tank (2), and the lower end abuts against the bottom of the groove of the U-shaped smoke exhaust pipe (8) . 9. A boiler flue gas heat recovery device according to any one of claims 1 to 4, characterized in that said water inlet (3) is located on the top surface of the water tank (2); said drain The mouth (4) is located on the bottom or bottom side of the water tank (2). 10. A boiler flue gas heat energy recovery device according to any one of claims 1 to 4, characterized in that the inner bottom surface (15) of the water tank (2) is an inclined plane, and the inner bottom surface (15) is opposite to the horizontal plane The inclination angle is 2 ° to 5 °, and a drain valve (16) is provided on the side of the water tank (2) adjacent to the lowest point of the inner bottom surface (15).

Images