Waste heat utilization device for boiler flue gas

Abstract

The utility model discloses a waste heat utilization device for boiler flue gas, and mainly relates to the field of flue gas waste heat utilization. Comprising a water tank, a circulating pump and a heat exchange pipeline, the heat exchange pipeline is arranged on the inner wall of a flue gas pipeline, a water outlet pipe and a water inlet pipe are arranged on the water tank, the circulating pump is arranged on the water outlet pipe, the heat exchange pipeline is arranged between the water outlet pipe and the water inlet pipe in a communicating mode, and a plurality of heat exchange fins are distributed on the heat exchange pipeline in an array mode. A plurality of reinforcing plates are arranged on the outer side of the flue gas pipeline, fixing bolts are arranged on the heat exchange pipeline, and the fixing bolts penetrate through the side wall of the flue gas pipeline and then are connected with the reinforcing plates. The flue gas waste heat utilization device has the advantages that the technical problems that the utilization rate of waste heat in existing flue gas is low and cost is high can be solved, waste heat in the flue gas is conveniently recycled through the heat exchange pipeline, meanwhile, the heat exchange pipeline serves as a structure for reinforcing the flue gas pipeline, the waste heat utilization cost is reduced, and the utilization rate of the waste heat in the flue gas is increased.

Description

Technical Field

[0001] The utility model relates to the field of flue gas waste heat utilization, in particular to a boiler flue gas waste heat utilization device. Background Art

[0002] The flue gas generated by boiler combustion still has a certain temperature. The heat contained in these flue gases is directly discharged into the air, which will cause a large amount of heat energy loss, increase the possible impact on the ecological environment, and increase the cost of the enterprise. The existing waste heat utilization device has a relatively complex structure and high construction and use costs. Its cost is difficult to cover the economic benefits generated by the recovery and utilization of flue gas waste heat. Therefore, many companies are not very enthusiastic about the recovery and utilization of waste heat in flue gas, resulting in a low waste heat recovery rate in the existing flue gas and serious waste of heat energy. Utility Model Content

[0003] The purpose of the utility model is to provide a waste heat utilization device for boiler flue gas, which can solve the technical problems of low waste heat utilization rate and high cost in the existing flue gas. The waste heat in the flue gas is conveniently recovered and utilized through a heat exchange pipe, and at the same time serves as a structure for reinforcing the flue gas pipe, thereby reducing the cost of waste heat utilization and improving the utilization rate of waste heat in the flue gas.

[0004] In order to achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] A device for utilizing waste heat from boiler flue gas comprises a water tank, a circulation pump, and a heat exchange pipe. The heat exchange pipe is arranged on the inner wall of the flue gas pipe, the water tank is provided with a water outlet pipe and a water inlet pipe, the circulation pump is provided on the water outlet pipe, the heat exchange pipe is communicated and arranged between the water outlet pipe and the water inlet pipe, a plurality of heat exchange fins are distributed in an array on the heat exchange pipe, a plurality of reinforcement plates are provided on the outside of the flue gas pipe, and fixing bolts are provided on the heat exchange pipe, and the fixing bolts pass through the side wall of the flue gas pipe and are connected to the reinforcement plates.

[0006] Furthermore, the longitudinal section of the flue gas duct is a rectangle, and there are multiple heat exchange ducts, and the multiple heat exchange ducts are respectively arranged at the vertices of the rectangle.

[0007] Furthermore, the longitudinal section of the reinforcement plate is L-shaped, and the L-shaped reinforcement plate is arranged at the vertex of the outer side of the rectangular flue gas duct.

[0008] Furthermore, an annular pipe is provided on both the water outlet pipe and the water inlet pipe, and the annular pipe is sleeved on the outside of the flue gas pipe. A plurality of connecting pipes are provided on the annular pipe, and the connecting pipes pass through the side wall of the flue gas pipe and are connected to the heat exchange pipe.

[0009] Furthermore, the water tank is provided with a liquid level gauge and a thermometer.

[0010] Furthermore, the heat exchange pipes and heat exchange fins are both made of metal.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The structure of the utility model is to set a heat exchange pipe inside the flue gas pipe. The water in the water tank flows into the heat exchange pipe through the water outlet pipe through the circulation pump. The heat exchange fins on the heat exchange pipe are used to exchange heat between the water and the flue gas. Then, the water is heated and enters the water tank from the water inlet pipe. After multiple cycles, the water temperature in the water tank reaches the specified temperature, which can be used for heating or bathing. The structure is simple, and the waste heat in the flue gas is effectively recovered and utilized at a low cost, which increases the enthusiasm of enterprises for construction and improves the efficiency of recovering and utilizing the waste heat in the flue gas.

[0013] 2. The heat exchange pipe is arranged on the inner wall of the flue gas pipe, and multiple reinforcement plates are arranged on the outside of the flue gas pipe. The fixing bolts on the heat exchange pipe pass through the side wall of the flue gas pipe and are connected to the reinforcement plates. This structure uses the reinforcement plates and fixing bolts to firmly fix the heat exchange pipe on the inner wall of the flue gas pipe, and also serves as a reinforcement rib to reinforce the flue gas pipe, thereby extending the service life of the flue gas pipe and further reducing the overall construction cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attachment Figure 1 It is a schematic diagram of an application scenario of the present utility model.

[0015] Attachment Figure 2 It is a schematic diagram of the three-dimensional structure of the flue gas duct of the present utility model.

[0016] Attachment Figure 3 It is a front view of the flue gas duct of the present invention.

[0017] Attachment Figure 4 This utility model is attached Figure 3 Cross-sectional view in the AA direction.

[0018] Attachment Figure 5 This utility model is attached Figure 3 Cross-sectional view in the BB direction.

[0019] Reference numerals shown in the accompanying drawings:

[0020] 1. Water tank; 2. Circulation pump; 3. Heat exchange pipe; 4. Flue gas pipe; 5. Water outlet pipe; 6. Water inlet pipe; 7. Heat exchange fins; 8. Reinforcement plate; 9. Fixing bolts; 10. Ring pipe; 11. Connecting pipe; 12. Liquid level gauge; 13. Thermometer. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined in this application.

[0022] Reference Figure 1 and Figure 2 The utility model is a device for utilizing the waste heat of boiler flue gas. The main structure includes a water tank 1, a circulating pump 2, and a heat exchange pipe 3. The water tank 1 is used to hold circulating water. The circulating water in the water tank 1 circulates in and out of the water tank 1 under the action of the circulating pump 2, realizing multiple cycles of heating of the circulating water. The heat exchange pipe 3 is arranged on the inner wall of the flue gas pipe 4. The flue gas discharged from the boiler is discharged from the flue gas pipe 4 after being treated. The heat exchange pipe 3 is a hollow pipe structure. The circulating water flows from the inside of the heat exchange pipe 3. The flue gas in the flue gas pipe 4 is in contact with the outer wall of the heat exchange pipe 3. The two exchange heat through the side wall of the heat exchange pipe 3 to realize the recovery and utilization of the heat in the flue gas. The water tank 1 is provided with a water outlet pipe 5 and a water inlet pipe 6. The circulating pump 2 is provided on the water outlet pipe 5. The heat exchange pipe 3 is connected and arranged between the water outlet pipe 5 and the water inlet pipe 6. The circulating pump 2 uses the water pump structure in the prior art. The circulating water in the water tank 1 is pumped out by the pumping force of the circulating pump 2 and is sent into the heat exchange pipe 3 through the water outlet pipe 5. The circulating water in the heat exchange pipe 3 is heated after exchanging heat with the flue gas and re-enters the water tank 1 from the water inlet pipe 6 to realize The circulating water in the water tank 1 is heated multiple times in a cycle to achieve continuous recycling of the heat in the flue gas. A plurality of heat exchange fins 7 are arranged in an array on the heat exchange pipe 3. The heat exchange fins 7 are fixed to the outer wall of the heat exchange pipe 3 by welding or integral molding. The heat exchange fins 7 are made of heat-conducting material. Such a structure allows the flue gas to contact with the plurality of heat exchange fins 7 when flowing through the heat exchange pipe 3, thereby greatly increasing the heat exchange area, further improving the heat exchange efficiency, and improving the utilization rate of the waste heat in the flue gas. A plurality of reinforcing plates 8 are provided on the outer side of the flue gas pipe 4. A fixing bolt 9 is provided, and the fixing bolt 9 is connected to the reinforcement plate 8 after passing through the side wall of the flue gas duct 4. The fixing plate and the heat exchange pipe 3 are fixed to the inner and outer sides of the flue gas duct 4 by using the fixing bolt 9, respectively, to form an effective reinforcement of the side wall of the flue gas duct 4, thereby improving the structural strength and service life of the flue gas duct 4, realizing the recovery and utilization of the waste heat in the flue gas, and serving as a reinforcement rib to reinforce the flue gas duct 4. The structure is simple, the utilization rate of the waste heat in the flue gas is higher, the production cost is lower, the enthusiasm of the enterprise construction is improved, and the installation and production cost of the device is reduced.

[0023] Preferably, refer to Figure 3 and Figure 4The longitudinal cross-section of the flue gas duct 4 is rectangular, and there are multiple heat exchange pipes 3, which are respectively arranged at the vertices of the rectangle. This structure allows multiple heat exchange pipes 3 to be respectively arranged at the vertices of the rectangle, thereby further improving the reinforcement effect of the rectangular flue gas duct 4, avoiding corrosion damage at the vertices of the rectangle, and further improving the service life of the flue gas duct 4.

[0024] Preferably, refer to Figure 5 The longitudinal section of the reinforcement plate 8 is L-shaped. The L-shaped reinforcement plate 8 is arranged at the vertex of the outer side of the rectangular flue gas duct 4. The L-shaped structure can better adapt to the shape of the outer vertex of the rectangular flue gas duct 4. There are two fixing bolts 9 and they are respectively connected to the horizontal part and the vertical part of the L-shape, which improves the fixing effect of the heat exchange pipe 3 and further improves the reinforcement effect of the flue gas duct 4.

[0025] Preferably, an annular pipe 10 is provided on both the water outlet pipe 5 and the water inlet pipe 6, and the annular pipe 10 is sleeved on the outside of the flue gas pipe 4. A plurality of connecting pipes 11 are provided on the annular pipe 10, and the connecting pipes 11 pass through the side wall of the flue gas pipe 4 and are connected with the heat exchange pipe 3. The arrangement of the annular pipe 10 allows the circulating water to be pumped to various positions of the flue gas pipe 4, and then the circulating water is pumped to the heat exchange pipes 3 at different positions through the connecting pipes 11, so that the distribution of the circulating water is smoother, thereby improving the smoothness of the circulating water circulation and heat exchange.

[0026] Preferably, the water tank 1 is provided with a liquid level meter 12 and a thermometer 13, which can monitor the water level and water temperature of the circulating water in the water tank 1 in real time, and then replenish the circulating water in time or control the flow rate of the circulating pump 2, thereby ensuring the supply status of the circulating water in the water tank 1 and realizing accurate control of the utilization of waste heat in the flue gas.

[0027] Preferably, the heat exchange pipe 3 and the heat exchange fins 7 are both made of metal. Metal has better thermal conductivity and corrosion resistance, ensuring the heat exchange effect while having a longer service life.

[0028] Working principle: The structure of the utility model sets a heat exchange pipe 3 inside the flue gas pipe 4. The water in the water tank 1 flows through the water outlet pipe 5 through the circulation pump 2 and enters the heat exchange pipe 3. The heat exchange fins 7 on the heat exchange pipe 3 are used to exchange heat between the water and the flue gas, and then the water is heated and enters the water tank 1 from the water inlet pipe 6. After multiple cycles, the water temperature in the water tank 1 reaches the specified temperature, which can be used for heating or bathing. The structure is simple, and the waste heat in the flue gas is effectively recovered and utilized at a low cost, which improves the positive impact of enterprise construction. Polarity improves the efficiency of recycling waste heat in the flue gas; the heat exchange pipe 3 is arranged on the inner wall of the flue gas pipe 4, and a plurality of reinforcement plates 8 are arranged on the outer side of the flue gas pipe 4. The fixing bolts 9 on the heat exchange pipe 3 pass through the side wall of the flue gas pipe 4 and are connected to the reinforcement plates 8. Such a structure utilizes the reinforcement plates 8 and the fixing bolts 9 to firmly fix the heat exchange pipe 3 on the inner wall of the flue gas pipe 4, and also serves as a reinforcement rib to reinforce the flue gas pipe 4, thereby extending the service life of the flue gas pipe 4 and further reducing the overall construction cost of the device.

Claims

1. A device for utilizing waste heat of boiler flue gas, comprising a water tank (1), a circulating pump (2), and a heat exchange pipe (3), wherein the heat exchange pipe (3) is arranged on the inner wall of a flue gas pipe (4), and is characterized in that: The water tank (1) is provided with a water outlet pipe (5) and a water inlet pipe (6), the circulating pump (2) is provided on the water outlet pipe (5), the heat exchange pipe (3) is connected and provided between the water outlet pipe (5) and the water inlet pipe (6), a plurality of heat exchange fins (7) are arranged in an array on the heat exchange pipe (3), a plurality of reinforcement plates (8) are provided on the outer side of the flue gas pipe (4), and a fixing bolt (9) is provided on the heat exchange pipe (3), and the fixing bolt (9) passes through the side wall of the flue gas pipe (4) and is connected to the reinforcement plate (8).

2. The device for utilizing waste heat from boiler flue gas according to claim 1, characterized in that: The longitudinal section of the flue gas duct (4) is rectangular, and there are multiple heat exchange ducts (3), which are respectively arranged at the vertices of the rectangle.

3. The device for utilizing waste heat from boiler flue gas according to claim 2, characterized in that: The longitudinal section of the reinforcement plate (8) is L-shaped, and the L-shaped reinforcement plate (8) is arranged at the vertex outside the rectangular flue gas duct (4).

4. The device for utilizing waste heat from boiler flue gas according to claim 2, characterized in that: The water outlet pipe (5) and the water inlet pipe (6) are both connected with an annular pipe (10), the annular pipe (10) is sleeved on the outside of the flue gas pipe (4), and a plurality of connecting pipes (11) are connected with the annular pipe (10), and the connecting pipes (11) pass through the side wall of the flue gas pipe (4) and are connected with the heat exchange pipe (3).

5. The device for utilizing waste heat from boiler flue gas according to claim 1, characterized in that: The water tank (1) is provided with a liquid level meter (12) and a thermometer (13).

6. The device for utilizing waste heat from boiler flue gas according to claim 1, characterized in that: The heat exchange pipe (3) and the heat exchange fins (7) are both made of metal.

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