Energy-saving steam boiler

Abstract

The present application relates to the field of steam boiler, especially to an energy-saving steam boiler, comprising a boiler body and a flue gas duct installed on the boiler body; a filter plate one and a filter plate two are installed in the flue gas duct in sequence along the axial direction; the flue gas discharged by the boiler body passes through the filter plate one and the filter plate two in sequence; the filter aperture of the filter plate one is larger than that of the filter plate two; a spraying ring for spraying water mist is installed on the outer surface of the flue gas duct; the spraying ring is provided with a liquid inlet pipe and a plurality of spray heads; the spray heads penetrate into the flue gas duct; the spraying ring is located between the filter plate one and the filter plate two; the present application realizes the differentiated treatment of different size particle impurities, after the large particle impurities are filtered and intercepted by the filter plate one, the small particle impurities are screened out, the space between the filter plate one and the filter plate two is used to spray water mist on the small particle impurities, the effective utilization rate of the water mist is improved, and the energy is saved.

Description

Technical Field

[0001] This invention relates to the field of steam boilers, and more particularly to an energy-saving steam boiler. Background Technology

[0002] A boiler is an energy conversion device. The energy input to a boiler can be in the form of chemical energy from fuel, electrical energy, or thermal energy from high-temperature flue gas. After conversion, the boiler outputs steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. During operation, steam boilers emit flue gas containing a large amount of dust, which would cause significant environmental pollution if directly discharged.

[0003] For example, Chinese patent CN118794001A discloses a steam boiler in which, after flue gas enters the shell, water mist is sprayed into the shell through atomizing nozzles to cause particulate impurities in the flue gas to gather and eventually be filtered by filter plates, thereby improving the filtration effect on particulate impurities in the flue gas. However, it has the following defects: directly spraying water mist uniformly onto the flue gas does not take into account that large particulate impurities in the flue gas do not need the gathering effect of water mist, because large particulate impurities can be directly intercepted by the filter structure. Only small particulate impurities need the gathering effect of water mist to improve the filtration and interception effect on small particulate impurities. Such uniform water mist spraying causes large particulate impurities to come into contact with water mist, consuming more water resources, but without benefiting the filtration effect, resulting in low effective utilization rate of water mist. Summary of the Invention

[0004] In order to overcome the drawback of existing steam boilers that consume a lot of useless resources in the treatment of particulate impurities in flue gas, this invention provides an energy-saving steam boiler.

[0005] The technical solution is as follows: An energy-saving steam boiler includes a boiler body and a flue gas duct installed on the boiler body; a filter plate one and a filter plate two are sequentially installed along the axial direction inside the flue gas duct; the flue gas discharged from the boiler body passes through the filter plate one and the filter plate two successively; the filtration aperture of the filter plate one is larger than that of the filter plate two; a spray ring for spraying water mist is installed on the outer surface of the flue gas duct; the spray ring has a liquid inlet pipe and multiple nozzles; the nozzles penetrate into the flue gas duct; the spray ring is located between the filter plate one and the filter plate two.

[0006] Furthermore, a rotating plate is mounted on the first filter plate; a motor for driving the rotating plate is mounted on the first filter plate; the rotating plate is in contact with the first filter plate.

[0007] Furthermore, a sewage pipe is installed through the exhaust duct, and the sewage pipe is located below the filter surface of the filter plate.

[0008] Furthermore, the filter plate has three fan-shaped filter sections, and the rotating plate is composed of three fan-shaped plates; the rotating plate is in contact with the filter sections.

[0009] Furthermore, multiple spray rings are provided, and the multiple spray rings are equidistantly distributed along the axial direction of the exhaust pipe; symmetrically distributed moving drive components are installed inside the exhaust pipe; the driving end of the moving drive component is connected to the filter plate two, and the filter plate two is driven to move inside the exhaust pipe through the moving drive component.

[0010] Furthermore, a water-absorbing component is installed inside the exhaust pipe; the water-absorbing component is located on the side of the second filter plate away from the first filter plate.

[0011] Furthermore, when the second filter plate moves to contact the water-absorbing element, it squeezes out the water inside the water-absorbing element.

[0012] Furthermore, the filter plate two has a horizontal grid on the side away from the filter plate one, and the water-absorbing element has a vertical grid on the side away from the filter plate two.

[0013] Furthermore, the horizontal grid plate is inclined.

[0014] Furthermore, a second drain pipe is installed through the exhaust pipe, and the second drain pipe is located below the water absorption element on the side near the second filter plate.

[0015] The beneficial effects of the present invention are as follows: The present invention enables the differentiation and treatment of impurities of different sizes. After filtering and intercepting large impurities using filter plate one, small impurities are screened out. The space between filter plate one and filter plate two is used to spray water mist on the small impurities in a targeted manner, which improves the aggregation effect of small impurities, increases the effective utilization rate of water mist, and saves energy.

[0016] This invention allows for adjustment of the space between filter plate one and filter plate two according to different amounts of flue gas, and adaptive use of a corresponding number of spray rings to optimize the water mist effect, reduce waste, and conform to the concept of energy conservation and environmental protection. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the energy-saving steam boiler of this invention;

[0018] Figure 2 The diagram shown is a three-dimensional structural schematic of the smoke exhaust duct of the present invention;

[0019] Figure 3 The diagram shown is a three-dimensional structural illustration of the internal structure of the exhaust duct of the present invention;

[0020] Figure 4The diagram shown illustrates the positional transformation of filter plate two according to the present invention;

[0021] Figure 5 The diagram shown is a three-dimensional structural illustration of the combination of filter plate 1 and rotating plate of the present invention;

[0022] Figure 6 This is a three-dimensional structural diagram of the internal structure of the exhaust duct of the present invention from another perspective;

[0023] Figure 7 The diagram shows a three-dimensional structural representation of the combined filter plate 2 and the water-absorbing element of the present invention.

[0024] Reference numerals: 1-Boiler body, 2-Exhaust pipe, 3-Filter plate one, 31-Filter screen, 4-Filter plate two, 41-Horizontal grid plate, 5-Spray ring, 51-Nozzle, 52-Liquid inlet pipe, 6-Rotating plate, 7-Moving drive component, 8-Water suction component, 81-Vertical grid plate, 9-Sewage pipe one, 10-Sewage pipe two. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] Example 1: An energy-saving steam boiler, such as Figures 1-7 As shown, the system includes a boiler body 1 and a flue gas duct 2. The flue gas duct 2 is installed on the boiler body 1. Filter plate 3 and filter plate 4 are installed sequentially along the axial direction inside the flue gas duct 2. The filtration aperture of filter plate 3 is larger than that of filter plate 4. A spray ring 5 is installed on the outer surface of the flue gas duct 2. The spray ring 5 has a liquid inlet pipe 52 and a plurality of nozzles 51 arranged in a ring. The nozzles 51 penetrate into the flue gas duct 2. The spray ring 5 is located between filter plate 3 and filter plate 4.

[0027] A rotating plate 6 is installed on the filter plate 3; a motor is installed on the filter plate 3, and the motor drives the rotating plate 6 to rotate; the rotating plate 6 is in contact with the filter plate 3.

[0028] A sewage pipe 9 is installed through the exhaust pipe 2, and the sewage pipe 9 is located below the filter surface of the filter plate 3.

[0029] The filter plate 3 has three fan-shaped filter sections 31, which are distributed equidistantly in a ring. The rotating plate 6 is composed of three fan-shaped plates, which are distributed equidistantly in a ring. The rotating plate 6 is in contact with the filter sections 31.

[0030] Multiple spray rings 5 ​​are provided (three are shown as an example in the figure), and the multiple spray rings 5 ​​are equidistantly distributed along the axial direction of the exhaust pipe 2; symmetrically distributed moving drive components 7 are installed in the exhaust pipe 2, and the moving drive components 7 are electric drive push rods; the driving end of the moving drive component 7 is connected to the filter plate 4.

[0031] In this embodiment, the flue gas generated by the boiler body 1 during operation is discharged through the flue gas duct 2. Since the discharged flue gas contains a large number of dust particles, a filter structure needs to be installed in the flue gas duct 2 to intercept the dust particles and reduce environmental pollution. In the prior art, water mist is sprayed in the flue gas duct 2 to aggregate particulate impurities in the flue gas and improve the filtration effect of particulate impurities. However, the prior art sprays water mist uniformly on the flue gas without considering that large particulate impurities in the flue gas do not need the aggregation effect of water mist, because large particulate impurities can be directly intercepted by the filter structure. Only small particulate impurities need the aggregation effect of water mist to improve the filtration effect of small particulate impurities. Such uniform water mist spraying also consumes a lot of water resources for large particulate impurities, but does not benefit the filtration effect, resulting in low effective utilization of water mist. Therefore, the present invention designs filter plate 3 and filter plate 4, and The filter pores of filter plate 3 are larger than those of filter plate 4. The flue gas first passes through filter plate 3 with the larger pore size, where large particles are intercepted and filtered. Smaller particles then pass through filter plate 3 and reach the space between filter plate 3 and filter plate 4. A spray ring 5 is designed in this space. An external water supply device is pre-connected to the inlet pipe 52, which supplies clean water into the spray ring 5. Water mist is then sprayed from the nozzle 51 onto the small particles passing through filter plate 3, causing them to aggregate and be intercepted by filter plate 4. This process effectively separates and treats particles of different sizes. After large particles are intercepted by filter plate 3, smaller particles are separated. The space between filter plate 3 and filter plate 4 is used to specifically spray water mist onto these smaller particles, improving their aggregation effect.

[0032] In addition, a rotating plate 6 is designed on the filter plate 3. The rotating plate 6 is driven by a motor to rotate and sweep the large particles of impurities that are filtered and intercepted on the filter plate 3, thereby reducing the clogging of the filter plate 3. The large particles of impurities that are swept down fall down to the drain pipe 9. The drain pipe 9 is connected to an external impurity collection device in advance, so that the large particles of impurities that are swept down are discharged from the drain pipe 9.

[0033] Furthermore, as shown in the figure, the filter screen 31 of filter plate 3 is designed in a fan shape, and the plate body of rotating plate 6 is also designed in a fan shape. When rotating plate 6 rotates at filter plate 3, it can not only sweep the filter screen 31, but also block the filter screen 31. That is, during the rotation of rotating plate 6, the filter screen 31 is gradually blocked, and then gradually moves away from the filter screen 31, exposing the filter screen 31. This allows the flue gas flow rate in the space between filter plate 3 and filter plate 4 to decrease from large to small, and then increase from small to large. In this way, the flue gas in the space between filter plate 3 and filter plate 4 can have a buffer time during the small flow stage, and fully contact and mix with the water mist. This reduces the situation where small particulate impurities cannot fully contact and mix with the water mist due to the continuous large flow of flue gas.

[0034] Furthermore, the filter plate 4 is designed as a movable structure, meaning that the filter plate 4 is moved within the flue gas duct 2 by controlling the moving drive component 7. Multiple spray rings 5 ​​are equidistantly distributed along the axial direction of the flue gas duct 2. When the boiler body 1 discharges a large amount of flue gas, it is necessary to increase the space between the filter plate 3 and the filter plate 4 to allow more flue gas to come into contact with and mix with the water mist. Therefore, the filter plate 4 can be controlled to move away from the filter plate 3, increasing the space between them. This also increases the required number of spray rings 5. Thus, the corresponding spray rings 5 ​​are activated. For example, in the diagram, the filter plate 4 is moved to the position furthest from the filter plate 3, and three spray rings are shown in the diagram. When all five filters are in use, and the amount of flue gas discharged from boiler body 1 is relatively small, it is necessary to reduce the space between filter plate 3 and filter plate 4 to ensure the density of water mist without wasting excess water mist. Therefore, filter plate 4 is moved closer to filter plate 3 to reduce the space between filter plate 3 and filter plate 4. Taking the figure as an example, filter plate 4 is moved to the position closest to filter plate 3. Only one spray ring 5 located between filter plate 3 and filter plate 4 is in use. This allows the space between filter plate 3 and filter plate 4 to be adjusted according to the amount of flue gas, and the corresponding number of spray rings 5 ​​can be used to optimize the water mist effect, reduce waste, and conform to the concept of energy conservation and environmental protection.

[0035] Example 2: Based on Example 1, such as Figures 1-7 As shown, a water-absorbing component 8 is installed inside the exhaust pipe 2. The water-absorbing component 8 is a sponge. The water-absorbing component 8 is located on the side of the filter plate 2 4 away from the filter plate 3.

[0036] When the filter plate 4 moves to contact the water-absorbing element 8, it squeezes out the water inside the water-absorbing element 8.

[0037] The filter plate 2 4 has multiple vertically equidistant horizontal grid plates 41 on the side away from the filter plate 1 3, and the water-absorbing component 8 has multiple horizontally equidistant vertical grid plates 81 on the side away from the filter plate 2 4.

[0038] The horizontal grid plate 41 is inclined (not shown in the figure).

[0039] A second drain pipe 10 is installed through the exhaust pipe 2, and the second drain pipe 10 is located below the water absorption component 8 on the side near the filter plate 4.

[0040] In this embodiment, considering that a small amount of water mist will be discharged along the flue pipe 2 with the airflow, which not only wastes water resources but also makes the rear part of the flue pipe 2 too damp and prone to corrosion, a water suction component 8 is added to absorb the excess water mist. After the filter plate 4 has been used for a period of time, a lot of small particle impurities will be attached, reducing the filtration efficiency. At this time, the water suction component 8 has also absorbed water mist for a period of time. Therefore, when the boiler body 1 stops exhausting, the control of the moving drive component 7 drives the filter plate 4 to move inside the flue pipe 2, so that the filter plate 4 moves to contact the water suction component 8 and squeezes the water suction component 8, so that the water in the water suction component 8 is squeezed out. The squeezed water overflows along the filter holes of the filter plate 4, thereby using this part of the water to rinse the filter holes of the filter plate 4, washing down the small particle impurities intercepted and filtered on the filter plate 4. The rinsing wastewater flows downward to the sewage pipe 10. The sewage pipe 10 is connected to the sewage treatment equipment in advance, and the rinsing wastewater is discharged from the sewage pipe 10 to achieve the rinsing of the filter plate 4.

[0041] Furthermore, by designing a horizontal grid plate 41 on the filter plate 2 4 and a vertical grid plate 81 on the water absorption component 8, the water squeezing effect on the water absorption component 8 is enhanced by the cross-shaped arrangement of the horizontal grid plate 41 and the vertical grid plate 81 without affecting the ventilation effect of the exhaust pipe 2. In addition, the horizontal grid plate 41 replaces the filter hole position of the filter plate 2 4 to squeeze the water absorption component 8, avoiding the direct contact between the filter hole position of the filter plate 2 4 and the water absorption component 8, which would cause particulate impurities at the filter hole of the filter plate 2 4 to contaminate the water absorption component 8 and make it dirty. Moreover, the horizontal grid plate 41 is designed to be inclined to guide the squeezed water to the filter hole position of the filter plate 2 4.

[0042] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An energy-saving steam boiler comprising a boiler body (1) and a flue gas duct (2) installed on the boiler body (1); characterized in that, The filter plate one (3) and the filter plate two (4) are sequentially arranged in the flue gas duct (2) in the axial direction; the flue gas discharged by the boiler body (1) passes through the filter plate one (3) and the filter plate two (4) in sequence; the filter aperture of the filter plate one (3) is larger than that of the filter plate two (4); the flue gas duct (2) is externally provided with a spray ring (5) for spraying water mist; the spray ring (5) is provided with a liquid inlet pipe (52) and a plurality of spray heads (51); the spray heads (51) penetrate into the flue gas duct (2); the spray ring (5) is located between the filter plate one (3) and the filter plate two (4). The filter plate one (3) is provided with a rotating plate (6); the filter plate one (3) is provided with a motor for driving the rotating plate (6); the rotating plate (6) is in contact with the filter plate one (3). The filter plate one (3) has three fan-shaped filter screen parts (31), and the rotating plate (6) is composed of three fan-shaped plate bodies; the rotating plate (6) is in contact with the filter screen parts (31); during the rotation of the rotating plate (6), the filter screen parts (31) are gradually blocked, then gradually separated from the filter screen parts (31), so that the filter screen parts (31) are exposed, and the flue gas flow through the space between the filter plate one (3) and the filter plate two (4) changes from large to small, and then from small to large. A plurality of spray rings (5) are arranged, and the plurality of spray rings (5) are equidistantly distributed along the flue gas duct (2) in the axial direction; the flue gas duct (2) is internally provided with symmetrically distributed moving driving members (7); the driving end of the moving driving member (7) is connected with the filter plate two (4), and the filter plate two (4) is driven to move in the flue gas duct (2) by the moving driving member (7); the space between the filter plate one (3) and the filter plate two (4) is adjusted according to different amounts of flue gas, and the corresponding number of spray rings (5) is adaptively put into use.

2. An energy efficient steam boiler as claimed in claim 1, wherein, The flue gas duct (2) is externally provided with a flue gas duct (2) penetratingly arranged flue pipe one (9), and the flue pipe one (9) is located below the filter surface of the filter plate one (3).

3. The energy efficient steam boiler as claimed in claim 1, wherein, The flue gas duct (2) is internally provided with a water absorbing member (8); the water absorbing member (8) is located on the side of the filter plate two (4) away from the filter plate one (3).

4. The energy saving steam boiler as claimed in claim 3, wherein When the filter plate two (4) moves to contact the water absorbing member (8), the water in the water absorbing member (8) is squeezed out.

5. An energy efficient steam boiler as claimed in claim 4, wherein, The side of the filter plate two (4) away from the filter plate one (3) is provided with a horizontal grid plate (41), and the side of the water absorbing member (8) away from the filter plate two (4) is provided with a vertical grid plate (81).

6. An energy efficient steam boiler as claimed in claim 5, wherein, The horizontal grid plate (41) is inclined.

7. The energy efficient steam boiler as claimed in claim 4, wherein, The flue gas duct (2) is externally provided with a flue gas duct (2) penetratingly arranged flue pipe two (10), and the flue pipe two (10) is located below the side of the water absorbing member (8) close to the filter plate two (4).

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