Boiler flue gas waste heat recovery device

Abstract

The utility model belongs to the technical field of waste heat recovery, and discloses a boiler flue gas waste heat recovery device which comprises a waste heat recovery bin, a flue gas inlet pipe, a flue gas outlet pipe, a rotating wheel heat exchanger, a fresh air inlet pipe and a fresh air outlet pipe. The rotating wheel heat exchanger is arranged in the waste heat recovery bin and penetrates through the baffle in the radial direction, the rotating center axis of the rotating wheel heat exchanger is overlapped with the vertical center axis of the baffle, the smoke inlet pipe communicates with an air inlet in the top of the cavity I, and the smoke outlet pipe communicates with an air outlet in the bottom of the cavity I; a first exhaust fan is further arranged at the air outlet in the bottom of the cavity I, the fresh air inlet pipe communicates with the air inlet in the bottom of the cavity II, the fresh air outlet pipe communicates with the air outlet in the top of the cavity II, and a second exhaust fan is further arranged at the air outlet in the top of the cavity II. By means of the smoke condensation and heat exchange process, water vapor in the smoke is effectively removed, waste heat in the boiler smoke is recycled, and the energy utilization efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of waste heat recovery, especially relates to a boiler flue gas waste heat recovery device. BACKGROUND

[0002] Boiler is the common energy conversion equipment in industrial production and civil heating, and the flue gas produced by burning fuel contains a large amount of heat energy. However, due to the influence of the past technology and the backward economic conditions, the traditional boiler system has the following problems:

[0003] (1) In the traditional boiler system, the flue gas produced by burning fuel contains a large amount of heat energy, but most of the heat energy is directly discharged into the atmosphere, causing waste of energy.

[0004] (2) In the process of industrial production and heating, the flue gas produced by the traditional boiler system carries a large amount of water, and the general user directly discharges the flue gas into the chimney pipe in the wall, a large amount of condensed water is produced after the high-temperature flue gas is cooled, which causes serious dampness of the wall, not only causes the original decoration to peel off, causes disputes, but also damages the strength of the wall, causing safety hazards.

[0005] However, the design and installation of the traditional boiler system are relatively fixed, and if the traditional boiler system is directly updated or replaced, a large-scale reconstruction or reconstruction of the system is needed, which involves equipment replacement, pipeline resetting, control system upgrading and other aspects. These work needs to consume a lot of manpower, material resources and financial resources. Therefore, how to solve the existing technical defects with low cost without large-scale reconstruction of the traditional boiler system has become an urgent problem. CONTENT OF THE UTILITY MODEL

[0006] In order to solve the problems existing in the prior art, the utility model discloses a boiler flue gas waste heat recovery device, which effectively removes the water vapor in the flue gas through the flue gas condensation and heat exchange process, recovers the waste heat in the boiler flue gas, and improves the energy utilization efficiency.

[0007] The specific technical scheme of the utility model is as follows:

[0008] The utility model provides a kind of boiler flue gas waste heat recovery device, including waste heat recovery bin, flue gas inlet pipe, flue gas outlet pipe, runner heat exchanger, fresh air inlet pipe and fresh air outlet pipe, wherein, the waste heat recovery bin is provided with baffle in vertical direction, and waste heat recovery bin is separated into cavity I and cavity II, the runner heat exchanger is arranged in the waste heat recovery bin, and it passes through the baffle along radial direction, the rotational center axis of the runner heat exchanger overlaps with the vertical center axis of the baffle, the flue gas inlet pipe is communicated with the air inlet of the top of cavity I, the flue gas outlet pipe is communicated with the air outlet of the bottom of cavity I, and first exhaust fan is further provided at the air outlet of the bottom of cavity I, the flue gas inlet pipe is communicated with flue, the flue gas outlet pipe is communicated with the discharge port of flue, the fresh air inlet pipe is communicated with the air inlet of the bottom of cavity II, the fresh air outlet pipe is communicated with the air outlet of the top of cavity II, and second exhaust fan is further provided at the air outlet of the top of cavity II.

[0009] Preferably, the ventilation hole of the runner heat exchanger is a corrugated porous channel structure composed of wave-shaped fins arranged and distributed.

[0010] Preferably, the ventilation hole of the runner heat exchanger is a honeycomb-shaped porous channel structure composed of polygonal fins arranged and distributed.

[0011] Preferably, the bottom of the cavity II is communicated with the condensate water neutralizing device through a pipeline.

[0012] Preferably, flow control valves are arranged on the flue gas inlet pipe, the flue gas outlet pipe and the fresh air outlet pipe to control the flow of gas.

[0013] Preferably, a sealing gasket is installed in the installation gap between the runner heat exchanger and the inner wall of the waste heat recovery bin.

[0014] Preferably, the other end of the fresh air outlet pipe is communicated with the air inlet end in the boiler system, and a wind pressure sensor is further arranged on the fresh air outlet pipe to detect the wind pressure in real time, so as to control the amount of air entering the boiler system.

[0015] Beneficial effects: The utility model discloses a kind of boiler flue gas waste heat recovery device, compared with prior art, with the following advantages:

[0016] (1) the utility model utilizes runner heat exchanger to realize that flue gas continuously carries out condensation and heat exchange, simultaneously, by being provided with corrugated porous channel structure or honeycomb-shaped porous channel structure in runner heat exchanger, increase heat exchange area, improve heat exchange efficiency, as far as possible reduce water vapor in flue gas, improve flue gas waste heat recovery efficiency.

[0017] (2) The condensed water generated in the rotary heat exchanger can absorb acidic substances in the flue gas to form acid water, and the acid water is discharged after being neutralized in the condensed water neutralizing device, which not only reduces the pollution of the boiler flue gas emission to the environment and meets the environmental protection requirements, but also avoids the corrosion and damage of the acidic condensed water to the pipeline and reduces the pollution to the environment.

[0018] (3) The utility model discloses a waste heat recovery device for boiler flue gas, which comprises a waste heat recovery bin, a flue gas inlet pipe, a flue gas outlet pipe, a rotary heat exchanger, a fresh air inlet pipe and a fresh air outlet pipe. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the device structure schematic view of example 1.

[0020] Figure 2 It is the radial section schematic view of the rotary heat exchanger of example 1.

[0021] In the drawing: waste heat recovery bin 1, cavity I 1-1, cavity II 1-2, first air extractor 1-3, second air extractor 1-4, flue gas inlet pipe 2, flue gas outlet pipe 3, rotary heat exchanger 4, air hole 4-1, fresh air inlet pipe 5, fresh air outlet pipe 6, baffle 7, flue 8, sealing pad 9, condensed water neutralizing device 10, air pressure sensor 11, flow control valve 12. DETAILED DESCRIPTION

[0022] The improvements and embellishments of the utility model will be described below in combination with the drawings, and these improvements and embellishments should also be regarded as the protection scope of the utility model. Example 1

[0023] A boiler flue gas waste heat recovery device, as shown in the figure, comprises a waste heat recovery bin 1, a flue gas inlet pipe 2, a flue gas outlet pipe 3, a rotary heat exchanger 4, a fresh air inlet pipe 5 and a fresh air outlet pipe 6. Figure 1

[0024] The waste heat recovery bin 1 is provided with a baffle 7 in the vertical direction, and the waste heat recovery bin 1 is divided into cavity I 1-1 and cavity II 1-2.

[0025] ​The rotary heat exchanger 4 is arranged in the waste heat recovery bin 1 and penetrates the baffle 7 in the radial direction, and the rotation center axis of the rotary heat exchanger 4 overlaps the vertical center axis of the baffle 7. During rotation around the rotation center axis, the air passage 4-1 of the rotary heat exchanger 4 is circulated in the cavity I 1-1 and the cavity II 1-2 constantly, so that the flue gas is fully condensed in the air passage 4-1 of the cavity I 1-1, and the heat absorbed by the air passage 4-1 is fully released and exchanged in the cavity II 1-2. In addition, a sealing pad 9 is arranged in the installation gap between the rotary heat exchanger and the inner wall of the waste heat recovery bin, so as to isolate the air inlet side from the air outlet side, and the gas passes through the air passage 4-1 of the rotary heat exchanger 4.

[0026] The flue gas inlet pipe 2 is communicated with the air inlet at the top of the cavity I 1-1, the flue gas outlet pipe 3 is communicated with the air outlet at the bottom of the cavity I 1-1, and the first air extractor 1-3 is arranged at the air outlet at the bottom of the cavity I 1-1, the flue gas inlet pipe 2 is communicated with the flue 8, and the flue gas outlet pipe 3 is communicated with the discharge port of the flue 8. Under the action of the first air extractor 1-3, the flue gas in the flue passes through the air passage 4-1 of the rotary heat exchanger 4 in the cavity I 1-1 through the flue gas inlet pipe 2 and enters the flue gas outlet pipe 3.

[0027] The fresh air inlet pipe 5 is communicated with the air inlet at the bottom of the cavity II 1-2, the fresh air outlet pipe 6 is communicated with the air outlet at the top of the cavity II 1-2, and the second air extractor 1-4 is arranged at the air outlet at the top of the cavity II 1-2. Under the action of the second air extractor 1-4, the normal temperature air passes through the air passage 4-1 of the rotary heat exchanger 4 in the cavity II 1-2 through the flue gas inlet pipe 2 and enters the flue gas outlet pipe 3.

[0028] In order to further increase the heat exchange contact area and improve the heat exchange efficiency, as shown in FIG. Figure 2 The air passage of the rotary heat exchanger in the embodiment 1 is a corrugated porous channel structure, and the corrugated porous channel structure is composed of wave-shaped fins arranged and distributed.

[0029] The bottom of the cavity II 1-2 is communicated with the condensate water neutralizing device 10 through a pipeline. The condensate water neutralizing device 10 is provided with an alkaline treatment agent such as soda lime for neutralizing the acidity of the condensate water. In order to realize the liquid collection of the condensate water, the bottom of the cavity II is designed as a bucket shape or an inclined structure, which is a common technical means for those skilled in the art, and thus is not described in detail.

[0030] In order to improve the stability and flow control and regulation efficiency of the system, the flue gas inlet pipe 2, the flue gas outlet pipe 3 and the fresh air outlet pipe 6 are all provided with flow control valves 12 for controlling the gas flow.

[0031] In this embodiment 1, the heat-exchanged air is recovered to the air inlet end of the traditional boiler system to realize waste heat recovery, and the specific implementation is as follows: the other end of the fresh air outlet pipe 6 is communicated with the air inlet end in the boiler system, and a wind pressure sensor 11 is further arranged on the fresh air outlet pipe to detect the wind pressure in real time, so as to control the air volume entering the boiler system.

[0032] In the utility model, the ventilation hole channel 4-1 of the rotating wheel heat exchanger 4 can also be arranged as a honeycomb-shaped multi-hole structure, which is composed of polygonal fins arranged and distributed. The ventilation hole channel of the rotating wheel heat exchanger in the utility model can but is not limited to the above structure, and can increase the heat exchange area and improve the ventilation hole channel of the heat exchange efficiency.

[0033] The working principle of the utility model is as follows:

[0034] The cavity I 1-1 of the rotating wheel heat exchanger 4 is connected with the flue, and the first air extractor 1-3 in the cavity I 1-1 is used to suck the hot smoke into the rotating wheel heat exchanger 4, so that the temperature of the rotating wheel heat exchanger 4 rises, the temperature of the flue gas decreases, and the water vapor in the flue gas is cooled into liquid water droplets after the flue gas is reduced, and is discharged into the condensate water neutralization device 10 for neutralization treatment.

[0035] The rotating wheel heat exchanger 4 heated by the hot flue gas rotates to the cavity II 1-2, and the new air sucked by the second air extractor 1-4 exchanges heat between the latent heat released by the hot flue gas and the new air to be heated through the rotating wheel heat exchanger 4, so that the new air is preheated before entering the boiler system, and the thermal efficiency is increased.

[0036] The preheated new air in the cavity II 1-2 can be monitored by the wind pressure sensor 11 to monitor the wind pressure in the system in real time, so as to control the air inlet volume to meet the air volume required by the boiler, so as to ensure the stability of the system air inlet volume.

[0037] The above is only the description of the utility model, which is the preferred embodiment of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and decorations can be made under the premise of departing from the utility model, and these improvements and decorations should also be regarded as the protection range of the utility model.

Claims

1. A boiler flue gas waste heat recovery device, characterized in that: The evaporator has a plurality of exhaust pipes and a plurality of exhaust pipes, and the exhaust pipe has a plurality of exhaust pipes and a plurality of external evaporators. The exhaust pipe has a plurality of external evaporators and a plurality of external evaporators. The exhaust pipe has a plurality of external evaporators and a plurality of external evaporators. The exhaust pipe has a plurality of external evaporators and a plurality of external evaporators.

2. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: The ventilation channel of the rotary heat exchanger is a corrugated multi-porous channel structure, and the corrugated multi-porous channel structure is composed of arranged and distributed wavy fins.

3. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: The ventilation channels of the rotary heat exchanger are honeycomb-shaped multi-porous channel structures, and the honeycomb-shaped multi-porous channel structure is composed of arranged and distributed polygonal fins.

4. The boiler flue gas waste heat recovery device according to claim 2 or 3, characterized in that: The bottom of the cavity II is connected to the condensed water neutralization device through a pipeline.

5. The boiler flue gas waste heat recovery device according to claim 2 or 3, characterized in that: The flue gas inlet pipe, the flue gas outlet pipe and the fresh air outlet pipe are all provided with flow control valves for controlling the gas flow.

6. The boiler flue gas waste heat recovery device according to claim 1, characterized in that: A sealing gasket is installed in the installation gap between the rotary heat exchanger and the inner wall of the waste heat recovery bin.

7. The boiler flue gas waste heat recovery device according to claim 2 or 3, characterized in that: The other end of the fresh air outlet pipe is connected to the air inlet end of the boiler system, and a wind pressure sensor is also provided on the fresh air outlet pipe for detecting the wind pressure in real time, thereby controlling the air volume entering the boiler system.

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