Waste heat recovery device for heating boiler

Abstract

The utility model relates to the field of boiler waste heat recovery, and discloses a waste heat recovery device for a heat supply boiler, which comprises a tank body, the bottom of the tank body is fixedly connected with a supporting base, the top of the tank body is fixedly connected with an air outlet pipe, a filtering mechanism is arranged in the air outlet pipe, the bottom of the tank body is fixedly connected with an air inlet pipe, and the air inlet pipe is fixedly connected with an air outlet pipe. A recycling mechanism is arranged in the tank body and comprises a cooling pipe, one end of the cooling pipe is fixedly connected with a water inlet pipe, and the other end of the cooling pipe is fixedly connected with a water outlet pipe. According to the cooling device, the first disc is rotated through the shifting piece, the overlap ratio of the fan-shaped grooves in the first disc and the fan-shaped grooves in the second disc is reduced, the flow speed of cooling liquid in the cooling pipe is reduced, the waste heat recovery efficiency of hot smoke is improved, and the contact area of the cooling pipe and the hot smoke is increased through the cooling pipe arranged in the spiral rising shape; the heat exchange efficiency is improved, and the waste heat recovery effect and the energy utilization rate are further improved.

Description

Technical Field

[0001] The utility model relates to the field of boiler waste heat recovery, in particular to a waste heat recovery device for a heating boiler. Background Art

[0002] A boiler is an energy conversion device. The energy input to the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The original meaning of pot refers to a water container heated on fire, and furnace refers to a place where fuel is burned. The boiler consists of two major parts: the pot and the furnace. The hot water or steam generated in the boiler can directly provide the required thermal energy for industrial production and people's lives, or can be converted into mechanical energy through a steam power device, or the mechanical energy can be converted into electrical energy through a generator. A boiler that provides hot water is called a hot water boiler, which is mainly used for life and also has a small number of applications in industrial production. However, in the process of using the boiler, the flue gas generated is usually directly discharged into the environment, but some of the heat contained in the flue gas can be recycled and used, which causes heat waste, reduces the utilization rate of thermal energy, and increases costs.

[0003] In the prior art, a large amount of flue gas carrying heat is generated when a hot boiler is in use. A waste heat recovery device is generally used in a factory to recover the heat in the flue gas, that is, cooling water with a high specific heat capacity is circulated to absorb the heat in the hot flue gas to reduce energy waste. However, the thermal power of the boiler has a large variation range, and the temperature and inherent heat of its hot flue gas are also different. When the hot flue gas is subjected to waste heat absorption by a coolant at a constant flow rate, the contact time between the coolant and the hot flue gas is shorter, thereby reducing the effect of waste heat absorption. At the same time, the hot flue gas contains a large number of impurity particles where the fuel has not been completely burned. Direct discharge will lead to reduced air quality in the workplace and will have an adverse effect on the health of on-site workers. Therefore, a waste heat recovery device for a heating boiler is proposed to solve the above problems. Utility Model Content

[0004] In order to remedy the above deficiencies, the utility model provides a waste heat recovery device for a heating boiler, aiming to improve the problem in the prior art that "the contact time between the constant flow rate coolant and the hot flue gas is too short resulting in low heat recovery efficiency".

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a waste heat recovery device for a heating boiler, comprising a tank body, a supporting base fixedly connected to the circumferential surface of the tank body, an air outlet pipe fixedly connected to the top of the tank body, a filtering mechanism is arranged inside the air outlet pipe, an air inlet pipe is fixedly connected to the bottom of the tank body, a recovery mechanism is arranged inside the tank body, the recovery mechanism comprises a cooling pipe, one end of the cooling pipe is fixedly connected to a water inlet pipe, the other end of the cooling pipe is fixedly connected to a water outlet pipe, and a control mechanism is arranged inside the water inlet pipe.

[0006] As a further description of the above technical solution:

[0007] The water outlet pipe and the water inlet pipe both penetrate and are fixedly mounted on the inner wall of the tank body, and the interior of the water inlet pipe is communicated with the interior of the water outlet pipe through the cooling pipe.

[0008] As a further description of the above technical solution:

[0009] The control mechanism comprises a paddle and a circular plate 1, wherein the paddle is fixedly mounted on the circumferential surface of the circular plate 1, and the circular plate 1 is rotatably mounted on the inner wall of the water inlet pipe.

[0010] As a further description of the above technical solution:

[0011] The control mechanism also includes a second circular plate, which is fixedly mounted on the inner wall of the water inlet pipe, and the surface of the second circular plate and the surface of the first circular plate are both provided with fan-shaped grooves.

[0012] As a further description of the above technical solution:

[0013] The control mechanism also includes a positioning block, which is slidably mounted on the inner wall of the circular plate 1. The positioning block is elastically connected to the inner wall of the circular plate 1 through a spring 1, and a positioning groove is provided on the inner wall of the water inlet pipe.

[0014] As a further description of the above technical solution:

[0015] The filtering mechanism comprises a shell and a pull rod, wherein the shell is fixedly mounted on the outer surface of the air outlet pipe, and a wedge is fixedly connected to the bottom of the pull rod, and the wedge is slidably mounted on the inner wall of the shell.

[0016] As a further description of the above technical solution:

[0017] The filtering mechanism further comprises a second spring, and the wedge block is elastically connected to the inner wall of the shell via the second spring.

[0018] As a further description of the above technical solution:

[0019] The filter mechanism also includes a filter plate, which is slidably mounted on the inner wall of the shell, a handle is fixedly connected to the front side of the filter plate, and a control groove is opened on the top of the filter plate.

[0020] The utility model has the following beneficial effects:

[0021] 1. In the utility model, the paddle rotates the disc one, so that the overlap between the fan-shaped grooves on the disc one and the fan-shaped grooves on the disc two is reduced, the flow rate of the coolant inside the cooling pipe is reduced, and the waste heat recovery efficiency of the hot flue gas is improved. The cooling pipe is arranged in a spiral ascending shape, the contact area between the cooling pipe and the hot flue gas is increased, the efficiency of heat exchange is improved, and the waste heat recovery effect and energy utilization rate are further improved.

[0022] 2. In the utility model, by pulling the pull rod to drive the wedge block to disengage from the inside of the control groove, the filter plate can be taken out from the inside of the shell by pulling the handle without hindrance and replaced and cleaned, thereby avoiding the filter plate from being used for a long time to reduce the filtering effect and affecting the filtering effect, thereby ensuring the health of the working people. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure section of the recovery mechanism in the utility model;

[0025] Figure 3 It is a schematic cross-sectional view of the three-dimensional explosion structure of the control mechanism and the water inlet pipe in the utility model;

[0026] Figure 4 It is a cross-sectional schematic diagram of the three-dimensional explosion structure of the control mechanism in the utility model;

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the filtering mechanism in the utility model;

[0028] Figure 6 It is a schematic cross-sectional view of the three-dimensional explosion structure of the filtering mechanism in the utility model.

[0029] Legend:

[0030] 1. Tank body; 2. Support base; 3. Exhaust pipe; 4. Inlet pipe; 5. Cooling pipe; 6. Water inlet pipe; 7. Water outlet pipe; 8. Paddle; 9. Round plate 1; 10. Round plate 2; 11. Fan-shaped groove; 12. Positioning block; 13. Spring 1; 14. Positioning groove; 15. Shell; 16. Pull rod; 17. Wedge block; 18. Spring 2; 19. Filter plate; 20. Handle; 21. Control groove. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] Reference Figure 1 The utility model provides an embodiment: a waste heat recovery device for a heating boiler, comprising a tank body 1, wherein hot flue gas is arranged inside the tank body 1, so as to heat the coolant inside the tank body 1 conveniently, thereby achieving the purpose of waste heat recovery, a supporting base 2 is fixedly connected to the circumferential surface of the tank body 1 for improving the stability of the tank body 1 during operation, an air outlet pipe 3 for discharging the hot flue gas inside the tank body 1 is fixedly connected to the top of the tank body 1, a filtering mechanism is arranged inside the air outlet pipe 3, an air inlet pipe 4 for inputting hot flue gas into the tank body 1 is fixedly connected to the bottom of the tank body 1, the air inlet pipe 4 is connected to an external pipeline, and receives the hot flue gas that needs to be utilized for waste heat, and since the density of hot flue gas is lower than that of air, the air inlet pipe 4 arranged at the bottom of the tank body 1 is conducive to the upward movement of the hot flue gas, thereby increasing the contact area between the hot flue gas and the coolant, and improving the efficiency of heat recovery.

[0033] Reference Figure 2 A recovery mechanism is arranged inside the tank body 1, and the recovery mechanism includes a cooling pipe 5. The cooling pipe 5 is arranged in a spiral ascending shape, which is beneficial to increasing the contact area of ​​the heat-insulated flue gas and improving the efficiency of heat exchange. One end of the cooling pipe 5 is fixedly connected to a water inlet pipe 6, and the other end of the cooling pipe 5 is fixedly connected to a water outlet pipe 7. The water inlet pipe 6 is located above the water outlet pipe 7, so that the coolant moves from top to bottom as a whole, which is beneficial to heat exchange with the hot flue gas. The water outlet pipe 7 and the water inlet pipe 6 are both penetrated and fixedly installed on the inner wall of the tank body 1. The interior of the water inlet pipe 6 is connected to the interior of the cooling pipe 5 and the water outlet pipe 7. The water outlet pipe 7 and the water inlet pipe 6 are connected to the external water tank, which is convenient for utilizing the recovered heat and improving the utilization rate of energy. A control mechanism is arranged inside the water inlet pipe 6.

[0034] Reference Figure 3 - Figure 4The control mechanism includes a paddle 8 and a circular plate 9. The paddle 8 is fixedly mounted on the circumferential surface of the circular plate 9. The paddle 8 is arranged to facilitate the staff to rotate the circular plate 9. The circular plate 9 is rotatably mounted on the inner wall of the water inlet pipe 6. The end of the paddle 8 away from the circular plate 9 is located outside the water inlet pipe 6. The control mechanism also includes a circular plate 10. The circular plate 10 is fixedly mounted on the inner wall of the water inlet pipe 6. The right side of the circular plate 10 and the left side of the circular plate 9 are fitted together. The surface of the circular plate 10 and the surface of the circular plate 9 are both provided with a fan-shaped groove 11 arranged in a quarter circle. The fan-shaped groove 11 on the circular plate 9 and the fan-shaped groove 11 on the circular plate 10 are initially in a coincident state. At this time, the flow rate of the coolant The control mechanism also includes a positioning block 12, which is slidably mounted on the inner wall of the circular plate 9. The sliding direction of the positioning block 12 is the radial direction of the circular plate 9. The end of the positioning block 12 away from the center of the circular plate 9 is set as an arc dome surface. The positioning block 12 is elastically connected to the inner wall of the circular plate 9 through a spring 13. The spring 13 applies an elastic force to the positioning block 12 away from the center of the circular plate 9. A positioning groove 14 matching the positioning block 12 is opened on the inner wall of the water inlet pipe 6. The number of the positioning grooves 14 is set to multiple groups. The multiple groups of positioning grooves 14 are arranged in a ring shape with equal intervals on the inner wall of the water inlet pipe 6. The total angle of the ring arrangement of the multiple groups of positioning grooves 14 is ninety degrees.

[0035] Reference Figure 5 - Figure 6 The filter mechanism includes a shell 15 and a pull rod 16. The pull rod 16 is used to facilitate the staff to pull upward, which is more labor-saving. The shell 15 is fixedly installed on the outer surface of the exhaust pipe 3. The bottom of the pull rod 16 is fixedly connected with a wedge 17. The bottom surface of the wedge 17 is set as an inclined surface, and the rear side surface of the wedge 17 is set as a vertical surface. The wedge 17 is slidably installed on the inner wall of the shell 15. The sliding direction of the wedge 17 is up and down sliding. The filter mechanism also includes a spring 18. The wedge 17 is elastically connected to the inner wall of the shell 15 through the spring 18. The spring 18 applies a downward elastic force to the wedge 17. The filter The mechanism also includes a filter plate 19, which is used to filter the impurity particles contained in the hot flue gas discharged to the outside of the tank body 1, reduce the possibility of impurity particles polluting the outside air, and effectively ensure the health of the site staff. The filter plate 19 is slidably installed on the inner wall of the shell 15, and the sliding direction of the filter plate 19 is forward and backward. The front side of the filter plate 19 is fixedly connected with a handle 20 for conveniently pulling the filter plate 19, so that the staff can replace the filter plate 19 conveniently and avoid clogging of the filter plate 19 to affect the filtering effect. A control groove 21 matching the wedge block 17 is provided on the top of the filter plate 19.

[0036] Working principle: when in use, by rotating the paddle 8, the paddle 8 drives the circular plate 19 to rotate, and the rotation of the circular plate 19 drives the positioning block 12 to rotate and disengage the positioning block 12 from the positioning groove 14. At this time, the positioning groove 14 squeezes the arc dome surface of the positioning block 12 so that the positioning block 12 overcomes the elastic force of the spring 13 and moves toward the direction close to the center of the circular plate 9. When the positioning block 12 enters the inside of the next positioning groove 14, the positioning block 12 re-enters the inside of the positioning groove 14 under the action of the spring 13, thereby improving the stability of the positioning block 12 when it is stationary, avoiding the displacement of the circular plate 19 when the water flows, and improving the control accuracy. At the same time, the rotation of the circular plate 19 will also drive the fan-shaped groove 11 on the circular plate 19 to rotate, thereby reducing the overlap between the fan-shaped groove 11 on the circular plate 19 and the fan-shaped groove 11 on the circular plate 2 10, reducing the flow rate of the coolant, increasing the retention time of the coolant in the cooling pipe 5, and increasing the effect of absorbing heat from the hot flue gas.

[0037] After the waste heat of the hot flue gas is recycled by the recovery mechanism, the remaining hot flue gas will be filtered by the filter plate 19 and then discharged to the outside of the tank body 1. When the filter plate 19 has been used for a long time and the filtering effect has declined and needs to be replaced, the pull rod 16 is pulled upward to drive the wedge block 17 to overcome the elastic force of the spring 21 and move upward until the wedge block 17 is completely separated from the control groove 21 at the top of the filter plate 19. At this time, the wedge block 17 no longer limits the filter plate 19, and the filter plate 19 can be driven to move outward by pulling the handle 20 outward, so that the filter plate 19 can be conveniently pulled out to the outside of the shell 15 and cleaned. When the filter plate 19 needs to be installed, the filter plate 19 is aligned with the installation notch of the shell 15 and pushed inward, and the wedge block 17 is stuck in the inside of the control groove 21, completing the limiting of the filter plate 19, and the filter plate 19 can be fixed more firmly inside the shell 15.

[0038] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waste heat recovery device for a heating boiler, comprising a tank body (1), characterized in that: The circumferential surface of the tank body (1) is fixedly connected to a support base (2), the top of the tank body (1) is fixedly connected to an air outlet pipe (3), a filtering mechanism is arranged inside the air outlet pipe (3), the bottom of the tank body (1) is fixedly connected to an air inlet pipe (4), a recovery mechanism is arranged inside the tank body (1), the recovery mechanism comprises a cooling pipe (5), one end of the cooling pipe (5) is fixedly connected to a water inlet pipe (6), the other end of the cooling pipe (5) is fixedly connected to a water outlet pipe (7), and a control mechanism is arranged inside the water inlet pipe (6).

2. A waste heat recovery device for a heating boiler according to claim 1, characterized in that: The water outlet pipe (7) and the water inlet pipe (6) both penetrate and are fixedly mounted on the inner wall of the tank body (1); the interior of the water inlet pipe (6) is connected to the interior of the water outlet pipe (7) via the cooling pipe (5).

3. The waste heat recovery device for a heating boiler according to claim 1, characterized in that: The control mechanism comprises a paddle (8) and a circular plate (9), wherein the paddle (8) is fixedly mounted on the circumferential surface of the circular plate (9), and the circular plate (9) is rotatably mounted on the inner wall of the water inlet pipe (6).

4. The waste heat recovery device for a heating boiler according to claim 3, characterized in that: The control mechanism further comprises a second circular plate (10), wherein the second circular plate (10) is fixedly mounted on the inner wall of the water inlet pipe (6), and the surface of the second circular plate (10) and the surface of the first circular plate (9) are both provided with fan-shaped grooves (11).

5. The waste heat recovery device for a heating boiler according to claim 4, characterized in that: The control mechanism further comprises a positioning block (12), the positioning block (12) being slidably mounted on the inner wall of the circular plate (9), the positioning block (12) being elastically connected to the inner wall of the circular plate (9) via a spring (13), and a positioning groove (14) being provided on the inner wall of the water inlet pipe (6).

6. The waste heat recovery device for a heating boiler according to claim 1, characterized in that: The filtering mechanism comprises a shell (15) and a pull rod (16); the shell (15) is fixedly mounted on the outer surface of the air outlet pipe (3); a wedge block (17) is fixedly connected to the bottom of the pull rod (16); and the wedge block (17) is slidably mounted on the inner wall of the shell (15).

7. A waste heat recovery device for a heating boiler according to claim 6, characterized in that: The filtering mechanism further comprises a second spring (18), and the wedge block (17) is elastically connected to the inner wall of the outer shell (15) via the second spring (18).

8. The waste heat recovery device for a heating boiler according to claim 7, characterized in that: The filtering mechanism further comprises a filter plate (19), the filter plate (19) being slidably mounted on the inner wall of the housing (15), a handle (20) being fixedly connected to the front side of the filter plate (19), and a control groove (21) being formed on the top of the filter plate (19).

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