Boiler flue gas waste heat recovery system

Abstract

The utility model discloses a boiler flue gas waste heat recovery system which comprises a boiler body, the top of the boiler body is fixedly communicated with a smoke exhaust pipe, the top end of the smoke exhaust pipe is fixedly communicated with a first heat exchanger through a pipeline, one side of the first heat exchanger is fixedly communicated with a first outlet pipe, and the other side of the first heat exchanger is fixedly communicated with a second outlet pipe. One end of the first outlet pipe is fixedly communicated with desulfurization equipment, a calcium carbonate filling plate is arranged in the desulfurization equipment, one side of the desulfurization equipment is fixedly communicated with a through pipe, and one end of the through pipe is fixedly communicated with a second heat exchanger. Comprising sensible heat and latent heat of flue gas, the sensible heat of the flue gas is recovered by utilizing return water of the boiler body, the latent heat of the flue gas is recovered by utilizing air entering the boiler body, and meanwhile, the heat of condensed water of water vapor in the flue gas is also recovered, so that the fuel consumption of the boiler body is saved, the waste of water resources is avoided, and the resource utilization rate is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, concretely is a boiler flue gas waste heat recovery system. BACKGROUND

[0002] With the continuous development of global economy and the sustained expansion of population size, people's demand for energy becomes increasingly vigorous. Traditional fossil energy such as oil, natural gas, coal still occupies the dominant position in energy consumption, but the reserves of these energy are limited, and the exploitation and use of these energy will cause damage to the environment and will bring serious pollution. In view of this, it is urgent to improve the utilization efficiency of existing fossil energy and find new alternative energy scheme, and the boiler is an important equipment for fossil energy supply, and the flue gas discharged by the boiler contains a large amount of heat energy, which will cause great waste of energy if not recycled and utilized, therefore we need to put forward a boiler flue gas waste heat recovery system. SUMMARY

[0003] The utility model discloses a boiler flue gas waste heat recovery system, which aims to solve the problem that the flue gas discharged by the boiler contains a large amount of heat energy, which will cause great waste of energy if not recycled and utilized.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A boiler flue gas waste heat recovery system, comprising a boiler body, a smoke exhaust pipe is fixedly communicated at the top of the boiler body, a first heat exchanger is fixedly communicated at the top end of the smoke exhaust pipe through a pipeline, a first outlet pipe is fixedly communicated on one side of the first heat exchanger, a desulfurization equipment is fixedly communicated at one end of the first outlet pipe, a calcium carbonate filling plate is arranged in the desulfurization equipment, a through pipe is fixedly communicated on one side of the desulfurization equipment, a second heat exchanger is fixedly communicated at one end of the through pipe, and a smoke exhaust pipe is fixedly communicated on one side of the second heat exchanger.

[0006] Preferably, a backwater pipe is fixedly communicated on the outer wall of the second heat exchanger, a backwater pump is fixedly communicated at one end of the backwater pipe through a pipeline, and the backwater pump is fixedly communicated with the first heat exchanger through a pipeline at one end.

[0007] Preferably, a backwater pipe is fixedly communicated on the outer wall of the second heat exchanger, a backwater pump is fixedly communicated at one end of the backwater pipe through a pipeline, and the backwater pump is fixedly communicated with the first heat exchanger through a pipeline at one end.

[0008] Preferably, a backwater pipe is fixedly communicated on the outer wall of the second heat exchanger, a backwater pump is fixedly communicated at one end of the backwater pipe through a pipeline, and the backwater pump is fixedly communicated with the first heat exchanger through a pipeline at one end.

[0009] Preferably, the desulfurization equipment is provided with a calcium carbonate filling plate.

[0010] Preferably, the bottom of the second heat exchanger is fixedly communicated with a blowdown pipe, and a stop valve is arranged on the outer wall of the blowdown pipe.

[0011] Preferably, the top of the desulfurization equipment is provided with a slot matched with the calcium carbonate filling plate, the calcium carbonate filling plate is inserted into the slot, the top of the calcium carbonate filling plate is fixedly connected with a sealing plate, and the sealing plate is bolted to the top of the desulfurization equipment.

[0012] Compared with the prior art, the desulfurization equipment has the advantages that:

[0013] The utility model fully recovers the waste heat of the boiler body, including the sensible heat and latent heat of flue gas, recovers the sensible heat of flue gas by using the backwater of the boiler body, recovers the latent heat of flue gas by using the air into the boiler body, and recovers the condensation water heat of water vapor in flue gas, which saves the consumption of boiler body fuel, avoids the waste of water resources, and is favorable for greatly improving the resource utilization rate. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structural schematic view of the utility model;

[0015] Figure 2 It is a structural schematic view of the utility model shaft side;

[0016] Figure 3 It is a structural schematic view of the waste heat recovery process of the utility model;

[0017] Figure 4 It is a structural schematic view of the desulfurization equipment and calcium carbonate filling plate of the utility model.

[0018] In the figure: 1, boiler body; 2, flue gas pipe; 3, first heat exchanger; 4, first outlet pipe; 5, desulfurization equipment; 6, through pipe; 7, second heat exchanger; 8, flue gas pipe; 9, calcium carbonate filling plate; 10, backwater pipe; 11, backwater pump; 12, air return pipe; 13, air blower; 14, backflow pipe; 15, air inlet pipe; 16, blowdown pipe; 17, stop valve; 18, slot; 19, sealing plate. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0020] Referring to Figures 1-4 The utility model provides a boiler flue gas waste heat recovery system, including the boiler body 1, the boiler body 1 can be gas -fired boiler also can be coal -fired boiler, the top of boiler body 1 is fixedly connected with the flue gas pipe 2, the top of flue gas pipe 2 is fixedly connected with the first heat exchanger 3 through pipeline, one side of first heat exchanger 3 is fixedly connected with the first outlet pipe 4, one end of first outlet pipe 4 is fixedly connected with the desulfurization equipment 5, the inside of desulfurization equipment 5 is provided with calcium carbonate filling board 9, one side of desulfurization equipment 5 is fixedly connected with the through pipe 6, one end of through pipe 6 is fixedly connected with the second heat exchanger 7, one side of second heat exchanger 7 is fixedly connected with the flue gas pipe 8, the utility model fully recovers the waste heat of the flue gas of boiler body 1, including the sensible heat and latent heat of flue gas, utilizes the return water of boiler body 1 to recover the sensible heat of flue gas, utilizes the air into boiler body 1 to recover the latent heat of flue gas, and the condensation water heat of water vapor in flue gas is also recovered, which saves the consumption of fuel of boiler body 1, avoids the waste of water resource, and is favorable for greatly improving resource utilization.

[0021] As Figure 3 shown, the flue gas of boiler body 1 enters the first heat exchanger 3, and the flue gas transfers heat to water in the inside of the first heat exchanger 3. After the flue gas discharges heat, the temperature of the flue gas is reduced. After the water in the first heat exchanger 3 absorbs the sensible heat of the flue gas, the temperature of the water is increased. Subsequently, the flue gas out of the first heat exchanger 3 enters the desulfurization equipment 5. The calcium carbonate filling board 9 arranged in the inside of the desulfurization equipment 5 can effectively remove the sulfur content in the flue gas. The flue gas discharged from the desulfurization equipment 5 enters the second heat exchanger 7. In the second heat exchanger 7, the flue gas exchanges heat with air. The air absorbs the heat of the flue gas, and the temperature of the air is increased. The temperature of the flue gas is further reduced. The water vapor in the flue gas is condensed into water. Subsequently, the heat-exchanged flue gas is discharged from the flue gas pipe 8.

[0022] As Figure 1 shown, the outer wall of the second heat exchanger 7 is fixedly connected with the return water pipe 10. One end of the return water pipe 10 is fixedly connected with the return water pump 11 through a pipeline. One end of the return water pump 11 is fixedly connected with the first heat exchanger 3 through a pipeline. The second heat exchanger 7 is a condensation heat exchanger.

[0023] As Figure 1 shown, the outer wall of the second heat exchanger 7 is fixedly connected with the return air pipe 12. One end of the return air pipe 12 is fixedly connected with the air blower 13 through a pipeline. One end of the air blower 13 is fixedly connected with the boiler body 1 through a pipeline. The outside air enters the second heat exchanger 7 to exchange heat with the sensible heat in the flue gas. After the temperature of the air is increased, the air flows out of the return air pipe 12 of the second heat exchanger 7 and enters the boiler body 1 under the action of the air blower 13.

[0024] As Figure 1As shown, the outer wall of the first heat exchanger 3 is fixedly communicated with a return pipe 14, one end of the return pipe 14 is fixedly communicated with the inside of the boiler body 1 through a pipeline, after the temperature of the flue gas in the second heat exchanger 7 is reduced, the water vapor in the flue gas is condensed into water and discharged from the return water pipe 10 of the second heat exchanger 7, under the action of the return water pump 11, enters the inside of the first heat exchanger 3, exchanges heat with the flue gas discharged from the boiler body 1 in the first heat exchanger 3, absorbs the sensible heat in the flue gas, the temperature of the return water is raised, the return water after the temperature is raised flows out from the return pipe 14 of the first heat exchanger 3 and enters the boiler body 1;

[0025] It is worth mentioning that the utility model also includes air inlet pipe 15, air inlet pipe 15 fixedly communicated at the bottom of second heat exchanger 7, by setting air inlet pipe 15, can make outside air enter the inside of second heat exchanger 7.

[0026] The bottom of the second heat exchanger 7 is fixedly communicated with a blowdown pipe 16, and a stop valve 17 is arranged on the outer wall of the blowdown pipe 16. The stop valve 17 can be a manual stop valve. The utility model fully recovers the waste heat of the flue gas discharged from the boiler body 1, including the sensible heat and latent heat of the flue gas. The sensible heat of the flue gas is recovered by the return water of the boiler body 1, the latent heat of the flue gas is recovered by the air entering the boiler body 1, and the condensation heat of the water vapor in the flue gas is also recovered. This not only saves the consumption of fuel of the boiler body 1, but also avoids the waste of water resources.

[0027] A slot 18 adapted to the calcium carbonate filling plate 9 is formed in the top of the desulfurization equipment 5, the calcium carbonate filling plate 9 is inserted into the slot 18, a sealing plate 19 is fixedly connected to the top of the calcium carbonate filling plate 9, and the inner cavity of the calcium carbonate filling plate 9 is provided with a desulfurizer such as calcium carbonate. The waste gas generated after the combustion of coal contains a certain amount of sulfur oxides, such as SO2 and SO3. The calcium carbonate in the calcium carbonate filling plate 9 can react with these sulfur oxides to generate calcium sulfate precipitate, thereby effectively removing sulfur oxides from flue gas. In addition to chemical reaction, calcium carbonate also has good physical adsorption capacity and can adsorb SO2 and SO3 in flue gas, further reducing its emission. The slot 18 can facilitate the disassembly and replacement of the calcium carbonate filling plate 9, and the sealing plate 19 can improve the sealing performance of the desulfurization equipment 5.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A boiler flue gas heat recovery system comprising a boiler body (1), characterized by: The top of the boiler body (1) is fixedly communicated with a smoke exhaust pipe (2), the top end of the smoke exhaust pipe (2) is fixedly communicated with a first heat exchanger (3) through a pipeline, one side of the first heat exchanger (3) is fixedly communicated with a first outlet pipe (4), one end of the first outlet pipe (4) is fixedly communicated with a desulfurization device (5), the inside of the desulfurization device (5) is provided with a calcium carbonate filling plate (9), one side of the desulfurization device (5) is fixedly communicated with a through pipe (6), one end of the through pipe (6) is fixedly communicated with a second heat exchanger (7), one side of the second heat exchanger (7) is fixedly communicated with the smoke exhaust pipe (2).

2. A boiler flue gas waste heat recovery system according to claim 1, characterized in that: The outer wall of the second heat exchanger (7) is fixedly communicated with a backwater pipe (10), one end of the backwater pipe (10) is fixedly communicated with a backwater pump (11) through a pipeline, one end of the backwater pump (11) is fixedly communicated with the first heat exchanger (3) through a pipeline.

3. A boiler flue gas heat recovery system according to claim 1, characterized in that: The outer wall of the second heat exchanger (7) is fixedly communicated with a back gas pipe (12), one end of the back gas pipe (12) is fixedly communicated with a blower (13) through a pipeline, one end of the blower (13) is fixedly communicated with the boiler body (1) through a pipeline.

4. A boiler flue gas heat recovery system according to claim 1, characterized in that: The outer wall of the first heat exchanger (3) is fixedly communicated with a backflow pipe (14), one end of the backflow pipe (14) is fixedly communicated with the inside of the boiler body (1) through a pipeline.

5. A boiler flue gas heat recovery system according to claim 1, characterized in that: An air inlet pipe (15) is further included, which is fixedly communicated with the bottom of the second heat exchanger (7).

6. A boiler flue gas heat recovery system according to claim 1, characterized in that: The bottom of the second heat exchanger (7) is fixedly communicated with a blowdown pipe (16), the outer wall of the blowdown pipe (16) is provided with a stop valve (17).

7. A boiler flue gas heat recovery system according to claim 1, characterized in that: The top of the desulfurization device (5) is provided with a slot (18) matched with the calcium carbonate filling plate (9), the calcium carbonate filling plate (9) is inserted into the inside of the slot (18), the top of the calcium carbonate filling plate (9) is fixedly connected with a sealing plate (19), and the sealing plate (19) is bolted to the top of the desulfurization device (5).

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