Composite energy saver for boiler

Abstract

The utility model relates to a composite energy saver for a boiler, which is characterized by comprising a gas inlet pipeline, a heat exchange dust collection box and a gas exhaust pipeline which are fixedly connected to a waste gas pipeline of the boiler. The heat exchange dust collection box comprises an upper dust collection box, a heat exchanger and a lower dust collection box, the upper dust collection box comprises an air inlet upper dust collection box and an air outlet upper dust collection box, the air inlet upper dust collection box and the air outlet upper dust collection box are separated by a partition plate and are not communicated with each other, and the heat exchanger comprises a water tank, a smoke guide pipe, a water inlet and a water outlet. The smoke guide pipes are uniformly distributed in the water tank, the upper ends of the smoke guide pipes are communicated with the upper dust collection box, and the lower ends of the smoke guide pipes are communicated with the lower dust collection box. The device is simple in structure, low in manufacturing cost, capable of reducing energy consumption of the boiler to the maximum extent, capable of recycling large-particle dust and prolonging the service life of the induced draft fan, energy-saving, environment-friendly and remarkable in economic benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas recovery and treatment, in particular to a boiler composite energy saver. Background Art

[0002] Boiler economizers efficiently recover a significant amount of waste heat from boiler exhaust gases that would otherwise be wasted. Through a unique heat exchange mechanism, as high-temperature flue gases pass through the economizer, heat is transferred to the feedwater or other medium entering the boiler, significantly lowering the exhaust temperature and minimizing heat loss. This process enables the boiler to output more effective energy with the same energy input, greatly improving energy efficiency.

[0003] Existing boiler economizers are designed to achieve energy savings by bending and rotating the boiler feed water pipe section multiple times or processing it into a spiral shape. This allows the boiler to instantly feed water to absorb the heat from the exhaust gas, thereby achieving energy conservation. Existing boiler economizers have certain shortcomings. During operation, dust and other impurities in the flue gas easily adhere to the pipe surface to form dust deposits, which not only reduces the heat transfer efficiency, but in severe cases may also clog the pipe and make cleaning difficult. The heat exchange area is limited by the cross-sectional area of ​​the boiler exhaust pipe, and the instantaneous water feed cannot fully absorb the heat from the exhaust gas, resulting in poor energy-saving effects. In addition, the boiler feed water pressure is greater than the boiler operating pressure, and the economizer is in a pressurized operating state, which increases safety risks. Moreover, its functions are relatively simple and it is unable to provide hot water to other places or remove dust from the exhaust gas. Utility Model Content

[0004] In response to the above problems, the utility model provides a boiler composite energy saver, which can arbitrarily set the heat exchange area to reduce boiler energy consumption, can supply hot water to the boiler and other places and operate at normal pressure, and is safe and accident-free even in the event of water shortage, water overflow and other faults; it can also replace the first-level dust collector or desulfurization device at the rear end of the boiler for environmental protection standard treatment, achieving dual purposes of one machine; in addition, it has a simple structure, low manufacturing cost, and is easy to clean and maintain. At the same time, it can also recycle large particles of dust and extend the service life of the induced draft fan.

[0005] The utility model is implemented as follows: a boiler composite energy saver, characterized in that it includes a heat exchange dust box fixedly connected to the boiler exhaust pipe, an air intake pipe, and an exhaust pipe, the heat exchange dust box including an upper dust box, a heat exchanger, and a lower dust box; one side of the upper dust box is provided with an air inlet upper dust box connected to the air intake pipe, and the other side is provided with an exhaust outlet upper dust box connected to the exhaust pipe, the air inlet upper dust box and the exhaust outlet upper dust box are separated by a partition and are not communicated with each other; the heat exchanger includes a water tank, a smoke guide pipe, a water inlet and a water outlet, the smoke guide pipe is evenly distributed in the water tank, the upper end is communicated with the upper dust box, and the lower end is communicated with the lower dust box, The upper cover plate of the water tank and the lower cover plate of the water tank are fixed in the heat exchange dust box, dividing the heat exchange dust box into the upper dust box, the heat exchanger and the lower dust box; the lower dust box is a connected box body, and the exhaust gas goes downward through the upper dust box of the air inlet, passes through the smoke guide pipe arranged below the upper dust box of the air inlet in the heat exchanger, enters the lower dust box, and then returns to the smoke guide pipe arranged below the upper dust box of the exhaust port in the heat exchanger, and is discharged through the upper dust box of the exhaust port, forming a primary and secondary heat exchange mechanism.

[0006] Furthermore, the lower dust collecting box includes a dust cleaning door and a sewage outlet.

[0007] Furthermore, the heat exchange mechanism is at least two-level.

[0008] Furthermore, the dust collecting box on the air inlet is provided with a spraying device.

[0009] Furthermore, the upper dust box includes a heat exchanger cleaning cover, which is placed on the top of the upper dust box and is sealed.

[0010] Furthermore, the water inlet is arranged at a lower side of the water tank, and the water outlet is placed at an upper side of the water tank.

[0011] Furthermore, when the heat exchange dust box is configured as a three-stage heat exchange mechanism, the exhaust duct is disposed on one side of the dust box below the exhaust port.

[0012] The beneficial effects of the utility model are as follows: the heat exchange area of ​​the boiler composite energy saver of the utility model can be set at will, which can minimize the energy consumption of the boiler and can not only supply hot water to the boiler, but also provide hot water for other equipment; the energy saver operates at normal pressure and will not cause safety accidents even in the event of water shortage, water overflow and other faults; it can replace the first-level dust collector or desulfurization device at the rear end of the boiler, treat the exhaust gas to meet environmental protection standards, and achieve dual purposes of one machine; it can recycle large particles of dust and extend the service life of the induced draft fan; and it has a simple structure, low manufacturing cost, and is extremely convenient to clean and maintain, and has the shortest investment payback period compared to other energy savers.

[0013] The present invention will be explained in detail below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the flow path of the exhaust gas in the heat exchanger of the utility model;

[0015] Figure 2 This is a schematic diagram of the external structure of the utility model from the right side;

[0016] Figure 3 This is a schematic diagram of the AA cross-sectional structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the BB cross-sectional structure of the utility model;

[0018] Figure 5 This is a schematic diagram of the CC cross-sectional structure of the utility model;

[0019] Figure 6 It is a structural schematic diagram of the three-stage heat exchange mechanism of the utility model.

[0020] In the figure: 1 air intake duct, 2 heat exchange dust box, 3 exhaust duct, 4 upper dust box, 5 heat exchanger, 6 lower dust box, 41 upper dust box for air intake, 42 upper dust box for exhaust outlet, 43 partition, 44 heat exchanger cleaning cover, 45 spray device, 51 water tank, 52 smoke guide pipe, 53 water inlet, 54 water outlet, 55 upper water tank cover, 56 lower water tank cover, 61 dust cleaning door, 62 sewage outlet, 63 lower dust box for exhaust outlet, 64 lower dust box partition. DETAILED DESCRIPTION

[0021] Example 1:

[0022] The utility model is a composite energy saver for boilers, such as Figure 2-5As shown, it is characterized in that it includes an air intake pipe 1 fixedly connected to the boiler exhaust pipe, a heat exchange dust box 2, and an exhaust pipe 3, the heat exchange dust box 2 includes an upper dust box 4, a heat exchanger 5, and a lower dust box 6; one side of the upper dust box 4 is provided with an air inlet upper dust box 41 connected to the air intake pipe 1, and the other side is provided with an exhaust port upper dust box 42 connected to the exhaust pipe 3, the air inlet upper dust box 41 and the exhaust port upper dust box 42 are separated by a partition 43 and are not connected to each other; the heat exchanger 5 includes a water tank 51, a smoke guide pipe 52, a water inlet 53 and a water outlet 54, the smoke guide pipe 52 is evenly distributed in the water tank 51, the upper end is connected to the upper dust box 4, and the lower end is connected to the lower dust box 6, The water tank upper cover plate 55 and the water tank lower cover plate 56 are fixed in the heat exchange dust box, dividing the heat exchange dust box into the upper dust box 4, the heat exchanger 5 and the lower dust box 6; the lower dust box 6 is a connected box body, and the exhaust gas goes downward through the upper dust box 41 of the air inlet, passes through the smoke guide pipe 52 arranged below the upper dust box 41 of the air inlet in the heat exchanger 5, enters the lower dust box 6, and then returns to the smoke guide pipe 52 arranged below the upper dust box 42 of the exhaust port in the heat exchanger 5, and is discharged through the upper dust box 42 of the exhaust port, forming a primary and secondary heat exchange mechanism.

[0023] like Figure 1-5 As shown, the exhaust gas from the boiler enters the upper dust box 41 of the air inlet through the air inlet pipe 1, then enters the lower dust box 6 through the smoke guide pipe 52, and then returns to the upper dust box 42 of the exhaust port through the smoke guide pipe 52. Because the smoke guide pipe 52 is evenly distributed in the water tank 51, the exhaust gas passes through the smoke guide pipe 52, and the smoke guide pipe 52 is heated, and the heat is then transferred to the circulating water in the water tank 51. At this time, after the exhaust gas undergoes two heat exchanges, the heat is fully absorbed by the circulating water before it is discharged. The circulating water in the water tank 51 is pumped into the water supply tank by the water supply pump. It can stay in the water tank 51 for a long time, and after being fully heated, it flows back to the water supply tank for use by the equipment.

[0024] Example 2:

[0025] This embodiment is an improvement of the first embodiment. In this embodiment, the lower dust box 6 is provided with a dust cleaning door 61. Boiler exhaust gas enters the lower dust box 6 through the smoke guide pipe 52 and then returns to the upper dust box 42 of the exhaust port through the smoke guide pipe 52, forming a two-stage heat exchange structure. Depending on the installation space, a three-stage or multi-stage exchange structure can also be set. Since the lower end of the first-stage exchanger and the front section of the second-stage exchanger are connected together, a large dust collection box is formed. When the exhaust gas passes through the lower dust box 6, the cross-sectional area suddenly increases, causing the exhaust gas flow rate to slow down, allowing dust particles to settle and be collected in the lower dust box 6. The dust can be cleaned and discharged through the dust cleaning door 61.

[0026] Example 3:

[0027] This embodiment is an improvement on the first embodiment. The upper dust box 4 includes a heat exchanger cleaning cover 44, which is placed on the top of the upper dust box and sealed. Dust in the exhaust gas often clogs the boiler exhaust pipe, making it difficult to clean the exhaust gas duct with traditional economizers. In the present invention, the exhaust gas is instead directed through the smoke guide pipe 52, which is arranged from top to bottom, reducing the amount of dust attached. The top-down, transparent design makes cleaning simple and easy. Simply open the heat exchanger cleaning cover 44 and use a pipe cleaner, high-pressure water gun, or other similar cleaning method.

[0028] Example 4:

[0029] This embodiment is an improvement on the first embodiment. In this embodiment, the lower dust box 6 is provided with a drain port 62, and the upper dust box 4 is provided with a spray device 45. Exhaust gas from the boiler enters the upper dust box 4, where sulfur dioxide in the flue gas undergoes an oxidation reaction with calcium carbonate in the slurry sprayed from the spray device 45 and air, producing calcium sulfate. After the calcium sulfate reaches a certain saturation, it crystallizes to form dihydrate gypsum, which can be discharged through the drain port 62. The spray device 45 can be located on either the air inlet upper dust box 41 or the exhaust outlet upper dust box 42, and can be in the form of a spray pipe or a spray head.

[0030] Embodiment 5:

[0031] This embodiment is an improvement of the first embodiment. In this embodiment, the water inlet 53 is arranged at the lower side of the water tank 51, and the water outlet 54 is placed at the upper side of the water tank 51. In this arrangement, the water in the water supply pool is pumped into the water tank 51 through the water inlet 53 by a water pump. The water flow will fully exchange heat before flowing back to the water supply pool through the water outlet 54. The hot water in the water pool can supply hot water to the boiler under normal pressure, and can also provide hot water to other equipment.

[0032] Example 6:

[0033] like Figure 6 As shown, this embodiment is an improvement on the second embodiment. This embodiment adds a lower dust box partition 64, dividing the lower dust box into two mutually incommunicable left and right sections. Furthermore, the lower dust box partition 64 is closer to the exhaust duct 3 than the upper dust box partition 43, and the exhaust duct 3 is relocated to the side of the newly divided exhaust port lower dust box 63. The original two-stage heat exchange mechanism is increased to a three-stage heat exchange mechanism, improving heat exchange efficiency. The same principle can also be used to add more stages of heat exchange mechanisms based on actual conditions.

[0034] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Although the present invention has been described in detail with reference to the preferred arrangement scheme, those skilled in the art should understand that the technical solution of the present invention, such as the connection method, the shape of each element, etc., can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A composite boiler economizer, characterized in that , comprising an air intake pipe (1) fixedly connected to the boiler exhaust pipe, a heat exchange dust box (2), and an exhaust pipe (3); the heat exchange dust box (2) comprises an upper dust box (4), a heat exchanger (5), and a lower dust box (6); one side of the upper dust box (4) is provided with an air intake upper dust box (41) connected to the air intake pipe (1), and the other side is provided with an exhaust upper dust box (42) connected to the exhaust pipe (3); the air intake upper dust box (41) and the exhaust upper dust box (42) are separated by a partition (43) and are not connected to each other; the heat exchanger (5) comprises a water tank (51), a smoke guide pipe (52), a water inlet (53) and a water outlet (54); the smoke guide pipe (52) is evenly distributed in the water tank (51), the upper end of which is connected to the upper dust box (4), and the lower end of which is connected to the lower dust box (6), The water tank upper cover plate (55) and the water tank lower cover plate (56) are fixed in the heat exchange dust box, dividing the heat exchange dust box into the upper dust box (4), the heat exchanger (5) and the lower dust box (6); the lower dust box (6) is a connected box body, and the exhaust gas flows downward through the air inlet upper dust box (41), passes through the smoke guide pipe (52) arranged below the air inlet upper dust box (41) in the heat exchanger (5), enters the lower dust box (6), and then returns to the smoke guide pipe (52) arranged below the exhaust port upper dust box (42) in the heat exchanger (5), and is discharged through the exhaust port upper dust box (42), forming a primary and secondary heat exchange mechanism.

2. The boiler composite economizer according to claim 1, characterized in that: The lower dust collecting box (6) comprises a dust cleaning door (61) and a sewage outlet (62).

3. The boiler composite economizer according to claim 1, characterized in that: The heat exchange mechanism is at least two-stage.

4. The boiler composite economizer according to claim 1, characterized in that: A spray device (45) is provided at the upper end of the upper dust collecting box (4).

5. The boiler composite economizer according to claim 1, characterized in that: The upper dust box (4) comprises a heat exchanger cleaning cover (44), and the heat exchanger cleaning cover (44) is placed on the top of the upper dust box (4) and is sealed.

6. The boiler composite economizer according to claim 1, characterized in that: The water inlet (53) is arranged on a side slightly below the water tank (51), and the water outlet (54) is placed on a side slightly above the water tank (51).

7. The boiler composite economizer according to claim 3, characterized in that: The exhaust duct (3) is arranged on one side of the dust collecting box (63) below the exhaust port.

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