CN203771707U - Flue gas waste heat recycling system for boiler - Google Patents

Abstract

A flue gas waste heat recycling system for a boiler comprises a boiler body (1). The boiler body (1) comprises a boiler water inlet (9) and a boiler water outlet (8). The top of the boiler body (1) is provided with a smoke exhaust pipe (2), the tail end of the smoke exhaust pipe (2) is provided with an exhaust fan (10), the smoke exhaust pipe (2) is covered with a water jacket (3), and the water jacket (3) is provided with a water jacket water inlet (7) and a water jacket water outlet (5). The flue gas waste heat recycling system for the boiler can reduce the temperature of the discharged flue gas, take full advantages of heat released by burning coal or wood in the boiler, reduce dust discharged into the air, reduce pollution to the environment, and achieve the purpose of highly-efficient energy conservation and emission reduction.

Description

A boiler flue gas waste heat recovery and utilization system

technical field

The utility model relates to the field of energy recovery and utilization, in particular to a boiler flue gas waste heat recovery and utilization system.

Background technique

Coal (wood)-fueled boilers are widely used in the aquaculture industry during the wintering of aquatic animals, but most of the flue gas produced by the boilers is directly discharged, which will discharge a large amount of heat and dust, which not only wastes energy but also pollutes environment.

In recent years, domestic patent databases have disclosed some relevant boiler patent technologies:

For example [patent number] CN200720101036, [name] double water jacket boiler, [notification number] CN201041371Y, this utility model provides a double water jacket boiler, which belongs to the technical field of civil coal-fired boilers. The technical problem to be solved is to provide a double-jacket boiler with high thermal efficiency and fuel saving. It includes a furnace body and a furnace composed of double-layer walls. There is a water jacket between the double-layer walls. The water jacket is provided with a water outlet port and a water return port. There is a reverse connecting pipe between the box and the furnace, a smoke exhaust pipe at the upper end of the smoke box, and an upper connecting pipe and a lower connecting pipe between the inner water jacket and the water jacket. The boiler puts the inner water jacket in the furnace and is directly baked by the fire, so the temperature rises quickly. A smoke box is set in the middle of the inner water jacket, so that the furnace gas is discharged out of the furnace after being deflected in the furnace, which is conducive to heat exchange, can effectively improve the thermal efficiency of the boiler, and has obvious energy-saving effects. It is an ideal substitute product for civil coal-fired boilers. However, the structure of the utility model is complicated, and the heat of flue gas generated by combustion cannot be effectively utilized, resulting in loss of energy and waste of energy.

For example [patent number] CN201320500198, [name] a heat-saving heat pipe waste heat recovery boiler system, [notification number] CN203464310U, the utility model discloses a heat-saving heat pipe waste heat recovery boiler system, including boilers, chimneys, and The main flue from the smoke outlet of the boiler to the chimney is provided with a heat pipe heat exchanger on the main flue, and the heat pipe heat exchanger is connected to the boiler through a water pipe. The utility model replaces the old-fashioned boiler economizer with a heat pipe heat exchanger with high thermal conductivity, which not only improves the heat transfer efficiency, but also has the advantages of compact structure, small fluid resistance loss, and beneficial control of dew point corrosion. However, the heat of the main flue is not fully utilized, the heat will still be lost from the main flue, and the heat of the flue gas cannot be effectively utilized.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, provide a boiler flue gas waste heat recovery and utilization system, reduce the temperature of flue gas discharge, make full use of the heat energy released by coal (wood) burning in the boiler, and reduce the emission to Reduce the amount of dust in the air, reduce environmental pollution, and achieve the purpose of high efficiency, energy saving and emission reduction.

In order to achieve the above object, the utility model adopts the following technical solutions:

A boiler flue gas waste heat recovery and utilization system, comprising a furnace body 1, the furnace body 1 includes a boiler water inlet 9 and a boiler water outlet 8; the top of the furnace body 1 is provided with a smoke exhaust pipe 2, and the smoke exhaust pipe An exhaust fan 10 is installed at the end of 2; the exhaust pipe 2 is covered with a water jacket 3, and the water jacket 3 is provided with a water jacket water inlet 7 and a water jacket water outlet 5.

As a further improvement of the utility model, one end of the boiler return pipe (17) is connected to the water jacket water inlet (7) for recycling water resources.

As a further improvement of the utility model, the boiler outlet 8 is connected with a boiler outlet pipe 18, and the boiler outlet pipe 18 is connected with a heating pipe 19 for heating the indoor 11.

As a further improvement of the utility model, the heating pipe 19 passes through the indoor chamber 11, and the end of the heating pipe 19 is connected to the boiler return pipe 17, so that water can be recycled and resources can be saved.

As a further improvement of the present utility model, the furnace body 1 also includes a boiler water return port 6, allowing hot water to enter the furnace body 1 again.

As a further improvement of the utility model, the boiler return port 6 is connected to the water outlet 5 of the water jacket, so that the heated water in the water jacket 3 enters the furnace body 1 .

As a further improvement of the utility model, the smoke exhaust pipe 2 is connected to the ground through the elbow 4, so that the exhausted smoke is buffered and settled in the smoke exhaust pipe 2.

As a further improvement of the utility model, the end of the exhaust pipe 2 is connected to the exhaust pipe 22 through an elbow 12 so that the smoke and dust can further settle in the exhaust pipe 2 .

As a further improvement of the present utility model, the exhaust pipe 2 is connected to the furnace body 1 through the outlet tee 14 of the furnace body, and the outlet tee 14 of the furnace body is provided with a valve 13 to facilitate removal of soot.

As a further improvement of the present utility model, the exhaust pipe 2 extends to the room 11 that needs to be heated through the outlet tee 14 of the furnace body. smoke inside.

As a further improvement of the present utility model, the water jacket 3 covers the entire smoke exhaust pipe 2 or covers a part of the smoke exhaust pipe 2 , which can fully absorb heat to heat the water in the water jacket 3 .

The working principle of the utility model: when the boiler starts to work, water is added to the furnace body 1 from the boiler water inlet 9, and the heated water flows out from the boiler water outlet 8 and enters the heating pipe 19 for heating the indoor 11. After the hot water heat is lost, it flows into the boiler return pipe 17 and flows into the water jacket 3 from the water jacket water inlet 7. The water jacket 3 covers the smoke exhaust pipe 2 and can fully absorb the heat of the smoke and dust generated by combustion, heat the water in the water jacket 3, and the heated water is heated again for the indoor 11, and then flows from the boiler return port 6 through the water outlet 5 of the water jacket Enter the furnace body 1, and together with the heated water in the furnace body 1, flow into the boiler outlet pipe 18 through the boiler outlet 8, and then flow into the heating pipe 19 to heat the room 11. The end of the water pipe 19 flows into the boiler return pipe 17 and then enters the water jacket 3 again for heating to recycle water resources; at the same time, the excess heat will also stay in the room to increase the temperature in the room. After passing through the elbow 4 and the elbow 12, a certain amount of buffering will be obtained, and most of them will settle in the exhaust pipe 2, reducing the emission of smoke and dust. When removing the smoke and dust, open the valve 13 of the outlet tee 14 of the furnace body, and use The blower is connected with the body of furnace outlet tee 14, which can quickly remove the smoke dust settled in the smoke exhaust pipe 2.

The beneficial effects that the utility model has are as follows:

1. This utility model can fully and effectively use the heat of flue gas to heat water and save energy.

2. This utility model makes the smoke and dust settle in the exhaust pipe, reduces the discharge of smoke and dust, and is convenient for cleaning and maintenance.

3. The utility model is simple in effect, safe and convenient to use, and is easy to promote and use.

4. The utility model improves the utilization rate of energy, saves energy, reduces smoke and dust emissions, and achieves the effect of high efficiency, energy saving and emission reduction.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the present utility model.

Fig. 2 is a schematic structural view of Embodiment 3 of the present utility model.

Figure 3 is a schematic diagram of the direction of water flow.

In the figure: 1-furnace body; 2-exhaust pipe; 3-water jacket; 4-elbow; 5-water jacket outlet; 6-boiler return port; 7-water jacket inlet; 8-boiler outlet; 9-boiler water inlet; 10-exhauster fan; 11-indoor; 12-elbow; 13-valve; 14-furnace outlet tee; 15-transfer tee; 16-valve; -Boiler outlet pipe; 19-heating pipe; 22-exhaust pipe.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Example 1

As shown in Figures 1 and 3, the system of this embodiment includes a furnace body 1, the furnace body 1 includes a boiler water inlet 9 and a boiler water outlet 8; the top of the furnace body 1 is provided with a smoke exhaust pipe 2, the An exhaust fan 10 is installed at the end of the smoke exhaust pipe 2; the smoke exhaust pipe 2 is covered with a water jacket 3, and the water jacket 3 is provided with a water jacket water inlet 7 and a water jacket water outlet 5. In this implementation, the boiler outlet 8 is connected to the boiler outlet pipe 18, the boiler outlet pipe 18 is connected to the heating pipe 19, the end of the heating pipe 19 is connected to the boiler return pipe 17, and one end of the boiler return pipe 17 is connected to the water jacket inlet. Shuikou 7. The furnace body 1 also includes a boiler water return port 6 connected to the water jacket water outlet 5 . The exhaust pipe 2 is connected with the body of furnace 1 through the outlet tee 14 of the furnace body, the outlet tee 14 of the furnace body is provided with a valve 13, the exhaust pipe 2 is connected to the ground through the elbow 4, and the exhaust pipe 2 The end is connected with the exhaust pipe 22 through the elbow 12 . The water jacket 3 covers the entire exhaust pipe 2 .

When the boiler starts to work, water is added into the furnace body 1 from the boiler water inlet 9, and the heated water flows out from the boiler water outlet 8 and enters the heating pipe 19 to heat the room 11, and the heated hot water flows in after the heat is lost. The boiler return pipe 17 flows into the water jacket 3 from the water inlet 7 of the water jacket. The water jacket 3 covers the smoke exhaust pipe 2 and can fully absorb the heat of the smoke and dust generated by combustion, heat the water in the water jacket 3, and the heated water is heated again for the indoor 11, and then flows from the boiler return port 6 through the water outlet 5 of the water jacket Enter the furnace body 1, and together with the heated water in the furnace body 1, flow into the boiler outlet pipe 18 through the boiler outlet 8, and then flow into the heating pipe 19 to heat the room 11. The end of the water pipe 19 flows into the boiler return pipe 17 and then enters the water jacket 3 again for heating to recycle water resources; at the same time, the excess heat will also stay in the room to increase the temperature in the room. After passing through the elbow 4 and the elbow 12, a certain amount of buffering will be obtained, and most of them will settle in the exhaust pipe 2, reducing the emission of smoke and dust. When removing the smoke and dust, open the valve 13 of the outlet tee 14 of the furnace body, and use The blower is connected with the body of furnace outlet tee 14, which can quickly remove the smoke dust settled in the smoke exhaust pipe 2.

Through the design of the embodiment, energy can be saved by 16%-20%, and smoke and dust emissions can be reduced by 50%-60%.

Example 2

As shown in FIG. 1 , the difference between this embodiment and Embodiment 1 is that the water jacket 3 covers part of the exhaust pipe 2 . The rest of the structure is the same. Through the design of the embodiment, energy can be saved by 10%-16%, and smoke and dust emissions can be reduced by 45%-50%.

Example 3

As shown in Figure 2 and Figure 3, the system of this embodiment includes a furnace body 1, the furnace body 1 includes a boiler water inlet 9 and a boiler water outlet 8; the top of the furnace body 1 is provided with a smoke exhaust pipe 2, the An exhaust fan 10 is installed at the end of the smoke exhaust pipe 2; the smoke exhaust pipe 2 is covered with a water jacket 3, and the water jacket 3 is provided with a water jacket water inlet 7 and a water jacket water outlet 5. In this embodiment, the furnace body 1 also includes a boiler water return port 6 connected to the water jacket water outlet 5 . The boiler outlet 8 is connected to a boiler outlet pipe 18, the boiler outlet pipe 18 is connected to a heating pipe 19, and the end of the heating pipe 19 is connected to a boiler return pipe 17. The smoke exhaust pipe 2 is connected to the ground through an elbow 4, and the smoke exhaust pipe 2 is extended to the room 11 to be heated through a transfer tee 15, and the transfer tee 15 is provided with a valve 16. The water jacket 3 covers the entire exhaust pipe 2 .

When the boiler starts to work, water is added into the furnace body 1 from the boiler water inlet 9, and the heated water flows out from the boiler water outlet 8 and enters the heating pipe 19 to heat the room 11, and the heated hot water flows in after the heat is lost. The boiler return pipe 17 flows into the water jacket 3 from the water inlet 7 of the water jacket. The water jacket 3 covers the smoke exhaust pipe 2 and can fully absorb the heat of the smoke and dust generated by combustion, heat the water in the water jacket 3, and the heated water is heated again for the indoor 11, and then flows from the boiler return port 6 through the water outlet 5 of the water jacket Enter the furnace body 1, and together with the heated water in the furnace body 1, flow into the boiler outlet pipe 18 through the boiler outlet 8, and then flow into the heating pipe 19 to heat the room 11. The end of the water pipe 19 flows into the boiler return pipe 17 and then enters the water jacket 3 again for heating to recycle water resources; at the same time, the excess heat will also stay in the room to increase the temperature in the room. Exhaust, get a certain buffer after passing through elbow 4 and elbow 12, and most of it will settle in the exhaust pipe 2, reducing the emission of smoke and dust. When cleaning the smoke and dust, open the valve 16 of the transfer tee 15, and use a blower Connected with the transfer tee 15, the smoke and dust settled in the smoke exhaust pipe 2 can be quickly removed.

Through the design of the embodiment, energy can be saved by 16%-20%, and smoke and dust emissions can be reduced by 50%-60%.

Example 4

As shown in FIG. 2 , the difference between this embodiment and embodiment 3 is that the water jacket 3 covers part of the exhaust pipe 2 . The rest of the structure is the same. Through the design of the embodiment, energy can be saved by 10%-16%, and smoke and dust emissions can be reduced by 45%-50%.

Claims (10)

1. A boiler flue gas waste heat recovery and utilization system, characterized in that: it includes a furnace body (1), and the furnace body (1) includes a boiler water inlet (9) and a boiler water outlet (8); the furnace body ( 1) A smoke exhaust pipe (2) is provided at the top position, and an exhaust fan (10) is installed at the end of the smoke exhaust pipe (2); the water jacket (3) is covered on the smoke exhaust pipe (2), so that The water jacket (3) is provided with a water jacket water inlet (7) and a water jacket water outlet (5). 2. A boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: the boiler outlet (8) is connected with a boiler outlet pipe (18), and the boiler outlet pipe (18) is connected with Heating tube (19). 3. A boiler flue gas waste heat recovery and utilization system according to claim 2, characterized in that: the heating pipe (19) passes through the room (11), and the end of the heating pipe (19) is connected to the boiler return pipe (17) )connect. 4. A boiler flue gas waste heat recovery and utilization system according to claim 3, characterized in that: one end of the boiler return pipe (17) is connected to the water jacket water inlet (7). 5. A boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: the furnace body (1) also includes a boiler return port (6). 6. A boiler flue gas waste heat recovery and utilization system according to claim 5, characterized in that: the boiler return port (6) is connected to the water outlet port (5) of the water jacket. 7. A boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: the exhaust pipe (2) is connected to the ground through an elbow (4), and the end of the exhaust pipe (2) is connected to the ground through an elbow Head (12) is connected with exhaust pipe (22). 8. A boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: the exhaust pipe (2) is connected to the furnace body (1) through the outlet tee (14) of the furnace body, and the The furnace body outlet tee (14) is provided with a valve (13). 9. A boiler flue gas waste heat recovery and utilization system according to claim 8, characterized in that: the exhaust pipe (2) is extended to the room (11) that needs to be heated through an adapter tee (15), The transfer tee (15) is provided with a valve (16). 10. A boiler flue gas waste heat recovery and utilization system according to claim 9, characterized in that: the water jacket (3) covers the entire exhaust pipe (2) or covers part of the exhaust pipe (2).