Energy-saving preheater for low-temperature waste heat recovery

Abstract

The utility model discloses an energy-saving preheater for low-temperature waste heat recovery in the related technical field of energy-saving preheaters, which comprises an energy-saving preheater main body and heat exchange tube groups, the lower end of the energy-saving preheater main body is provided with a smoke inlet, the upper end of the energy-saving preheater main body is provided with a smoke outlet, and the energy-saving preheater main body is internally provided with a plurality of layers of heat exchange tube groups. One end of the heat exchange pipe set is connected with a water inlet main pipe, the other end of the heat exchange pipe set is connected with a water return main pipe, a heat conduction sleeve is arranged outside the section, located in the energy-saving preheater body, of the heat exchange pipe set, cooling fins are arranged on the outer side of the heat conduction sleeve, and a pipeline connecting sleeve is installed at a smoke inlet of the energy-saving preheater body. The lower baffle plate is arranged at the smoke inlet of the energy-saving preheater main body, so that the flow speed of smoke can be effectively reduced, the smoke can enter the energy-saving preheater main body more uniformly to perform sufficient heat exchange with the heat exchange tube group, and the heat conduction sleeve and the radiating fins are arranged on the outer side of the heat exchange tube group, so that the heat energy recovery rate is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field related to energy-saving preheaters, and specifically relates to an energy-saving preheater for recovering low-temperature waste heat. Background Art

[0002] An energy-saving preheater is a type of waste heat recovery equipment that is increasingly used in industrial production. By recovering the waste heat emitted by the boiler, the equipment can not only effectively reduce energy consumption, but also reduce environmental pollution and achieve green production. Traditional energy-saving preheaters are equipped with a heat exchange tube group. The flue gas enters the preheater from the inlet and exchanges heat with the heat exchange tube group. Since there is no shielding device, part of the flue gas passes through the gap between the heat exchange tube groups and is directly discharged from the outlet. Sufficient heat exchange cannot be carried out, resulting in a low heat recovery rate.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an energy-saving preheater for recovering low-temperature waste heat. To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0005] The heat dissipation device of claim 1, wherein the heat dissipation device is configured to dissipate heat from the heat of the elongated screen, the heat dissipation device being connected to the heat dissipation device by way of example only. The heat dissipation device being configured to dissipate heat from the heat of the elongated screen.

[0006] As a further solution of the present invention: the lower baffle is arranged in an inclined structure, and is provided with evenly distributed air holes, which can effectively reduce the flow rate of the flue gas entering the energy-saving preheater body.

[0007] As a further solution of the present invention: the upper baffle is arranged in a horizontally staggered structure, and the upper baffle is also provided with the evenly distributed air holes, which can further slow down the exhaust speed of the smoke.

[0008] As a further solution of the present invention: a water inlet joint is provided at the middle position of the outer side of the water inlet main pipe, a water outlet joint is provided at the middle position of the outer side of the water return main pipe, and the water inlet joint is connected to the water supply end of the circulating water.

[0009] As a further solution of the present invention: the upper and lower parts of the energy-saving preheater body are both designed as cone structures, and the smoke inlet and the smoke outlet are both provided with connecting flanges for sealing connection with the flue.

[0010] As a further solution of the present invention: a heat-insulating layer is provided on the inner wall of the energy-saving preheater body to reduce heat loss.

[0011] As a further solution of the present invention, the heat dissipation fins between adjacent heat-conducting sleeves cooperate with each other to reduce the gap between the pipes of the heat exchange tube group, so that the heat exchange tube group and the flue gas can fully exchange heat.

[0012] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0013] The energy-saving preheater body of the present invention is provided with a lower deflector at the smoke inlet, which can effectively reduce the smoke flow velocity, so that the smoke enters the energy-saving preheater body more evenly, and fully exchanges heat with the heat exchange tube group. The outside of the heat exchange tube group is provided with a heat-conducting sleeve and heat dissipating fins, which effectively improves the heat energy recovery rate.

[0014] The smoke outlet of the utility model is provided with an upper deflector to further slow down the exhaust speed of smoke and avoid the formation of negative pressure, which affects the use effect of the energy-saving preheater. At the same time, a condensation water collection tank is provided at the smoke inlet to collect the condensation water generated during the operation of the energy-saving preheater. The condensation water is discharged through the drain pipe. The structure is simple and practical.

[0015] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0017] In the picture:

[0018] Figure 1 It is a structural diagram of the utility model;

[0019] Figure 2 This is the main view of the utility model;

[0020] Figure 3 This is the main sectional view of the utility model;

[0021] Figure 4 This is a schematic diagram of the heat exchange tube group arrangement of the present utility model;

[0022] Figure 5 This is a schematic diagram of the baffle of the present utility model.

[0023] In the figure: 1. Energy-saving preheater body; 2. Smoke inlet; 3. Smoke outlet; 4. Water inlet main pipe; 5. Return water main pipe; 6. Water inlet joint; 7. Water outlet joint; 8. Heat exchange tube group; 9. Connecting flange; 10. Drain pipe; 11. Pipe connecting sleeve; 12. Condensate collection tank; 13. Lower baffle; 14. Upper baffle; 15. Uniformly distributed air holes; 16. Heat conduction sleeve; 17. Heat dissipation fins; 18. Insulation layer.

[0024] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0026] like Figures 1 to 5 As shown, the energy-saving preheater for low-temperature waste heat recovery includes an energy-saving preheater body 1 and a heat exchange tube group 8. The lower end of the energy-saving preheater body 1 is provided with a smoke inlet 2, and the upper end is provided with a smoke outlet 3. A multi-layer heat exchange tube group 8 is provided in the energy-saving preheater body 1. One end of the heat exchange tube group 8 is connected to the water inlet pipe 4, and the other end is connected to the return water pipe 5. A heat-conducting sleeve 16 is provided outside the section of the heat exchange tube group 8 located in the energy-saving preheater body 1, and a heat-conducting fin 17 is provided on the outside of the heat-conducting sleeve 16. A pipe connecting sleeve 11 is installed at the smoke inlet 2 of the preheater main body 1, and a condensate collecting tank 12 is formed between the outer wall of the pipe connecting sleeve 11 and the inner wall of the energy-saving preheater main body 1. A drain pipe 10 is installed on the outer wall of the energy-saving preheater main body 1 on the side of the condensate collecting tank 12. A lower baffle 13 is provided near the smoke inlet 2 in the energy-saving preheater main body 1, and an upper baffle 14 is provided near the smoke outlet 3 in the energy-saving preheater main body 1, which are used to slow down the flow rate of the flue gas in the energy-saving preheater.

[0027] The lower baffle 13 is arranged in an inclined structure, and is provided with evenly distributed air holes 15 , which can effectively reduce the flow rate of the flue gas entering the energy-saving preheater body 1 .

[0028] The upper baffle 14 is arranged in a horizontally staggered structure, and is also provided with evenly distributed air holes 15, which can further slow down the exhaust speed of the smoke.

[0029] A water inlet joint 6 is provided at the middle position of the outer side of the water inlet main pipe 4, and a water outlet joint 7 is provided at the middle position of the outer side of the water return main pipe 5. The water inlet joint 6 is connected to the water supply end of the circulating water.

[0030] The upper and lower parts of the energy-saving preheater body 1 are both designed as cone structures, and the smoke inlet 2 and the smoke outlet 3 are both provided with connecting flanges 9 for sealing connection with the flue.

[0031] An insulation layer 18 is provided on the inner wall of the energy-saving preheater body 1 to reduce heat loss.

[0032] The heat dissipation fins 17 between adjacent heat-conducting sleeves 16 cooperate with each other to reduce the gap between the tubes of the heat exchange tube group 8, so that the heat exchange tube group 8 and the flue gas can fully exchange heat.

[0033] The working principle of the utility model is as follows: the smoke inlet pipe is connected to the pipe connecting sleeve 11, and the smoke is supplied to the energy-saving preheater main body 1. A lower deflector 13 is provided at the smoke inlet 2. The lower deflector 13 is an inclined staggered structure. The lower deflector 13 is provided with uniformly distributed air holes 15, so that the smoke entering the energy-saving preheater main body 1 can move up evenly and slowly, and exchange heat with the heat exchange tube group 8. Circulating water is provided in the heat exchange tube group 8, and a heat conductive sleeve 16 is provided on the outer side of the heat conductive sleeve 16. Heat dissipation fins 17 are provided on the outer side of the heat conductive sleeve 16, which can effectively improve the heat exchange rate and thus improve the thermal efficiency of smoke recovery. After the smoke passing through the heat exchange tube group 8 is decelerated by the upper deflector 14, it is discharged to the outside of the energy-saving preheater main body 1. The smoke entering the energy-saving preheater main body 1 is pre-cooled and condensed into water. The condensed water flows along the lower deflector 13 and the inner wall of the energy-saving preheater main body 1 into the condensed water collecting tank 12, and the condensed water is discharged through the drain pipe 10;

[0034] The present invention has a novel structure with reasonable design and is easy to install and use. A lower deflector 13 is provided at the smoke inlet 2 of the energy-saving preheater main body 1, which can effectively reduce the flue gas flow rate, so that the flue gas enters the energy-saving preheater main body 1 more evenly, and fully exchanges heat with the heat exchange tube group 8. A heat-conducting sleeve 16 and heat dissipating fins 17 are provided on the outside of the heat exchange tube group 8, which effectively improve the heat energy recovery rate. An upper deflector 14 is provided at the smoke outlet 3 to further slow down the smoke discharge speed and avoid the formation of negative pressure, which affects the use effect of the energy-saving preheater. At the same time, a condensate collection tank 12 is provided at the smoke inlet 2 for collecting condensate generated during the operation of the energy-saving preheater. The condensate is discharged through the drain pipe 10. The structure is simple and practical.

[0035] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments using the above-mentioned technical content without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. An energy-saving preheater for recovering low-temperature waste heat, comprising an energy-saving preheater body (1) and a heat exchange tube group (8), characterized in that: The energy-saving preheater body (1) is provided with a smoke inlet (2) at the lower end and a smoke outlet (3) at the upper end. The energy-saving preheater body (1) is provided with a plurality of layers of the heat exchange tube group (8). One end of the heat exchange tube group (8) is connected to the water inlet main pipe (4), and the other end is connected to the water return main pipe (5). A heat conduction sleeve (16) is provided outside the section of the heat exchange tube group (8) located inside the energy-saving preheater body (1). The heat conduction sleeve (16) is provided with heat dissipation fins (17) on the outside. A pipe connection sleeve (11) is installed at the smoke inlet (2), a condensate collection groove (12) is formed between the outer wall of the pipe connection sleeve (11) and the inner wall of the energy-saving preheater body (1), a drain pipe (10) is installed on the outer wall of the energy-saving preheater body (1) on the side of the condensate collection groove (12), a lower baffle (13) is provided in the energy-saving preheater body (1) near the smoke inlet (2), and an upper baffle (14) is provided in the energy-saving preheater body (1) near the smoke outlet (3).

2. The energy-saving preheater for low-temperature waste heat recovery according to claim 1 is characterized in that: The lower baffle (13) is arranged in an inclined structure, and is provided with evenly distributed air holes (15).

3. The energy-saving preheater for low-temperature waste heat recovery according to claim 2, characterized in that: The upper baffle (14) is arranged in a horizontal staggered structure, and the upper baffle (14) is also provided with the evenly distributed air holes (15).

4. The energy-saving preheater for low-temperature waste heat recovery according to claim 3 is characterized in that: A water inlet joint (6) is provided at the middle position of the outer side of the water inlet main pipe (4), and a water outlet joint (7) is provided at the middle position of the outer side of the water return main pipe (5).

5. The energy-saving preheater for low-temperature waste heat recovery according to claim 4 is characterized in that: The upper and lower parts of the energy-saving preheater body (1) are both designed as cone structures, and the smoke inlet (2) and the smoke outlet (3) are both provided with connecting flanges (9).

6. The energy-saving preheater for low-temperature waste heat recovery according to claim 5, characterized in that: A heat-insulating layer (18) is provided on the inner wall of the energy-saving preheater body (1).

7. The energy-saving preheater for low-temperature waste heat recovery according to claim 6, characterized in that: The heat dissipation fins (17) between adjacent heat-conducting sleeves (16) cooperate with each other.

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