A D class boiler in-furnace steam-water separation device

Abstract

This utility model relates to the field of boiler technology and discloses a steam-water separation device for a Class D boiler. It includes a boiler body and an evaporator tube located inside the furnace chamber. A lower header is located at the bottom of the boiler body, and an upper header is located at the top. The upper and lower ends of the evaporator tube are connected to the upper and lower headers, respectively. The evaporator tube contains saturated water, and a steam-water separation device is located at the top of the evaporator tube, with a gap between the device and the water surface below it. Steam rises and enters a spiral steam channel, rotating rapidly upwards along the channel. Tiny water droplets in the steam, under the influence of gravity and centrifugal force, detach from the steam and fall back into the evaporator tube, significantly reducing the water content in the steam and achieving steam-water separation. This improves the quality of the steam and alleviates abnormal water level fluctuations in the heat exchange tubes. The collected water droplets reduce the supply of saturated water in the evaporator tubes to a certain extent, effectively saving energy and water resources.

Description

Technical Field

[0001] This utility model belongs to the field of boiler technology, specifically relating to a steam-water separation device inside a Class D boiler. Background Technology

[0002] Boilers, as an important thermal energy device, are widely used in industrial production and daily life. Their working principle is as follows: fuel (such as coal or natural gas) burns in the boiler to produce high-temperature flue gas, releasing heat; the high-temperature flue gas exchanges heat with water through a heat exchanger inside the boiler, gradually raising the water temperature and eventually producing steam. The steam is then transported through pipelines to the equipment in need.

[0003] In boiler technology, achieving efficient steam-water separation is crucial. The goal is to ensure that the steam leaving the boiler drum has a high dryness (low water content) while effectively returning the separated water to the water circulation system. Wet steam can lead to serious problems such as superheater scaling, corrosion, reduced efficiency, and even water erosion of turbine blades.

[0004] In response to this, existing technologies typically use external steam-water separators, which not only take up space but also reduce the overall structural integrity of the boiler, and the steam-water separation effect cannot meet actual needs. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an in-furnace steam-water separation device for a Class D boiler, so as to solve the technical problems of external steam-water separators causing additional space occupation and poor steam-water separation effect in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A Class D boiler in-furnace steam-water separation device includes a boiler body and an evaporator tube located in the furnace chamber inside the boiler body. A lower header is provided at the bottom of the boiler body, and an upper header is provided at the top of the boiler body. The upper and lower ends of the evaporator tube are connected to the upper header and the lower header, respectively. The evaporator tube is filled with saturated water, and a steam-water separation device is provided at the top of the evaporator tube. There is a gap between the steam-water separation device and the water surface below it. The steam-water separation device reduces the water content in the steam. The steam-water separation device includes a sealing plate set at the top opening of the evaporator tube and a screw fixedly connected to the bottom surface of the sealing plate. The screw includes a rod body and spiral blades that extend vertically around the outer surface of the rod body. The spiral blades form a spiral steam passage. Multiple vent holes are opened on the sealing plate. The vent holes are opposite to the spiral blades. Steam enters the upper header through the vent holes.

[0008] Furthermore, the evaporation tubes are distributed circumferentially at the edge of the furnace;

[0009] Furthermore, the axis of the rod body coincides with the axis of the sealing plate, that is, the screw is set at the center of the bottom surface of the sealing plate;

[0010] Furthermore, the furnace body includes side walls and top and bottom plates located at the upper and lower ends of the side walls. The lower header includes a lower header bottom plate located below the furnace body bottom plate. The lower header bottom plate is annular, and a connecting channel is formed at its inner ring. Between the lower header bottom plate and the furnace body bottom plate, annular lower header inner supports and lower header outer supports are provided from the inside to the outside. Both the lower header inner supports and lower header outer supports are located at the edge of the furnace body bottom plate.

[0011] Furthermore, the upper header includes an annular upper header cover plate located above the furnace body top plate. Between the upper header cover plate and the furnace body top plate, there are annular upper header inner supports and upper header outer supports spaced from the inside to the outside. Both the upper header inner supports and upper header outer supports are located at the edge of the upper header cover plate.

[0012] Furthermore, an energy-saving device is also provided on one side of the furnace body. The energy-saving device includes a box connected to the furnace body. The box contains a layered coil that is continuously folded in the horizontal plane and extends vertically. The water outlet of the coil is connected to the water inlet pipe at the bottom of the lower header. A smoke outlet channel is also provided on the top side wall of the box body.

[0013] Furthermore, connection ports are provided on the top side wall of the furnace body and the top side wall of the box body, and the two are connected by pipes;

[0014] Furthermore, the smoke exhaust channel is directly opposite the connection port on the top of the box, and a baffle is provided in the middle of the connection port between the smoke exhaust channel and the top of the box. The baffle is fixedly connected to the top plate and side wall of the box and extends vertically downward. There is a gap between the baffle and the bottom plate of the box, which forms a smoke passage.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) Compared with the prior art, by installing a steam-water separation device at the top of the evaporator tube, the steam rises and enters the spiral steam channel, and rises at high speed along the spiral steam channel. Under the action of gravity and centrifugal force, the tiny water droplets in the steam are separated from the steam and fall back into the evaporator tube, which greatly reduces the water content in the steam and realizes steam-water separation, thereby improving the quality of the steam. The falling tiny water droplets can be collected, which reduces the supply of saturated water in the evaporator tube to a certain extent, effectively saving energy and water resources. The steam with lower water content can also reduce the adverse effects on downstream equipment (such as turbine blades). Moreover, it can also effectively alleviate the phenomenon of abnormal water level fluctuation in the heat exchange tube. In addition, by embedding the steam-water separation device in the evaporator tube, space can be effectively saved and the overall structure of the boiler can be improved.

[0017] (2) Through the installation of energy-saving devices, high-temperature flue gas flows into the housing through the connection port and preheats the saturated water in the coil. On the one hand, the waste heat of the flue gas can be reused, and the preheated saturated water can be heated up quickly, thus effectively saving resources. On the other hand, the flue gas temperature is reduced, which can meet the emission standards without additional treatment, simplifying the production process and improving production efficiency. In addition, the path of high-temperature flue gas is extended by the baffle, thereby increasing the contact time between the high-temperature flue gas and the coil, which further improves the preheating effect of saturated water and the cooling effect of flue gas. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the following drawings are provided for illustration:

[0019] Figure 1 This is a front view of the steam-water separation device inside the Class D boiler in Embodiment 1 of this utility model;

[0020] Figure 2 This is a cross-sectional view of the steam-water separation device inside the Class D boiler in Embodiment 1 of this utility model;

[0021] Figure 3 This is a cross-sectional view (another perspective) of the steam-water separation device inside the Class D boiler in Embodiment 1 of this utility model.

[0022] Figure 4 for Figure 2 Enlarged view at point A1;

[0023] Figure 5 for Figure 2 Enlarged view at point A2;

[0024] Figure 6 for Figure 4 Enlarged view of section A3 in the middle.

[0025] The following labels are shown in the attached diagram:

[0026] Furnace body 1, furnace chamber 101, burner 102, burner head 103, lower header 104, lower header bottom plate 105, lower header internal support 106, lower header external support 107, upper header 108, upper header cover plate 109, upper header internal support 110, upper header external support 111, evaporator pipe 112, steam-water separator 2, screw 201, rod body 202, spiral blade 203, sealing plate 204, vent hole 205, energy-saving device 3, housing 301, smoke outlet channel 302, coil 303, baffle 304. Detailed Implementation

[0027] Example 1, specifically as follows: Figures 1-6 As shown.

[0028] A Class D boiler in-furnace steam-water separation device includes a furnace body 1 and an evaporation pipe 112 located in the furnace chamber 101 inside the furnace body 1. The evaporation pipe 112 extends vertically and is filled with saturated water. A steam-water separation device 2 is provided at the top of the evaporation pipe 112 to reduce the water content in the steam.

[0029] like Figure 1 As shown, the furnace body 1 includes side walls and a top plate and a bottom plate located at the upper and lower ends of the side walls, which together form a cylindrical structure. The internal space of the furnace body 1 is the furnace chamber 101. In this embodiment, the top plate and the bottom plate of the furnace body 1 are both perforated plates. The bottom of the furnace body 1 is provided with a lower header 104, and the top of the furnace body 1 is provided with an upper header 108. Specifically, the lower header 104 includes a lower header bottom plate 105 located below the bottom plate of the furnace body 1. The lower header bottom plate 105 is annular, and a connecting channel is formed at its inner ring. A cylindrical lower header inner support 106 and a lower header outer support 107 are welded between the lower header bottom plate 105 and the bottom plate of the furnace body 1 from the inside to the outside. The lower header inner support 106 and the lower header outer support 107 are both located at the edge of the bottom plate of the furnace body 1. It is worth explaining in detail that the outer wall of the lower header inner support 106 contacts the inner ring of the lower header bottom plate 105, and the lower header inner support 106 extends vertically to the bottom of the lower header bottom plate 105. The lower header 104 is formed by the lower header bottom plate 105, the lower header inner support 106, the lower header outer support 107, and the furnace body 1 bottom plate. The internal space of the lower header 104 is used for water storage.

[0030] The upper header 108 includes an annular upper header cover 109 located above the top plate of the furnace body 1. Cylindrical upper header inner supports 110 and outer supports 111 are welded between the upper header cover 109 and the top plate of the furnace body 1, spaced from the inside out. Both the upper header inner supports 110 and outer supports 111 are located at the edges of the upper header cover 109. It should be further noted that the outer wall of the upper header inner support 110 contacts the inner ring of the upper header cover 109, and the upper header inner support 110 extends vertically above the upper header cover 109. The upper header 108 is formed by the upper header cover 109, the upper header inner support 110, the upper header outer support 111, and the top plate of the furnace body 1. The internal space of the upper header 108 is used to contain steam.

[0031] Evaporation tubes 112 are distributed circumferentially along the edge of the furnace chamber 101. The upper and lower ends of the evaporation tubes 112 are connected to the upper header 108 and the lower header 104, respectively. Specifically, the top and bottom plates of the furnace body 1 have corresponding connection holes, and the two ends of the evaporation tubes 112 are inserted into these holes. The evaporation tubes 112 are welded and fixed to the top and bottom plates of the furnace body 1. Saturated water from the lower header 104 is injected into the evaporation tubes 112 using a water pump or other pressurizing device, maintaining the saturated water level in the evaporation tubes 112 at a certain height, with a gap between the saturated water level and the top opening of the evaporation tubes 112.

[0032] The bottom of the lower header 104 is connected to a water inlet pipe (not shown in the figure), which supplies saturated water to the lower header 104. The top of the upper header 108 is connected to a main steam pipe (not shown in the figure), through which steam is transported to steam-using equipment (such as steam turbine).

[0033] Below the furnace body 1, a burner 102 is also provided. The burner head 103 of the burner 102 passes through the connecting channel in the middle of the lower header bottom plate 105 and the furnace body bottom plate to enter the furnace chamber 101. The high-temperature flame generated by the burner head 103 heats the surrounding evaporation tubes 112. The burner 102 and the burner head 103 are both existing technologies and will not be described in detail here.

[0034] To reduce the water content in the steam, a steam-water separation device 2 is provided at the top of the evaporation tube 112. It is worth emphasizing that a gap is left between the steam-water separation device 2 and the water surface below it. The steam-water separation device 2 includes a sealing plate 204 disposed at the top opening of the evaporation tube 112 and a screw 201 fixedly connected to the bottom surface of the sealing plate 204. The screw 201 includes a cylindrical rod body 202 and spiral blades 202 extending vertically around the outer surface of the rod body 202, forming a spiral steam passage. It is necessary to further explain that in this embodiment, the top surface of the rod body 202 is welded and fixed to the bottom surface of the sealing plate 204, and the axis of the rod body 202 coincides with the axis of the sealing plate 204, that is, the screw 201 is located at the center of the bottom surface of the sealing plate 204. Multiple vent holes 205 are provided on the sealing plate 204 along the circumferential direction. The vent holes 205 are opposite to the spiral blades 202, and steam enters the upper header 108 through the vent holes 205.

[0035] In operation, the burner head 103 first heats the evaporator tubes 112 inside the furnace 101. The saturated water in the evaporator tubes 112 evaporates to form steam. At this point, the steam has a high water content. The steam rises and enters the spiral steam passage, rotating rapidly upwards along it. Tiny water droplets in the steam, under the influence of gravity and centrifugal force, detach from the steam and fall back into the evaporator tubes 112, significantly reducing the water content and achieving steam-water separation, thereby improving steam quality. The collected water droplets reduce the supply of saturated water in the evaporator tubes, effectively saving energy and water resources. Furthermore, the lower water content of the steam also reduces adverse effects on downstream equipment (such as turbine blades). Additionally, by integrating the steam-water separation device 2 into the evaporator tubes 112, space is effectively saved, improving the overall structural integrity of the boiler.

[0036] One side of the furnace body 1 is also equipped with an energy-saving device 3, such as Figure 3 As shown, the energy-saving device 3 includes a housing 301 connected to the furnace body 1. Specifically, both the top side wall of the furnace body 1 and the top side wall of the housing 301 have connection ports, which are connected by pipes. The housing 301 contains a layered coil 303 that is continuously folded in the horizontal plane and extends vertically. The water outlet of the coil 303 is connected to the middle manifold (not shown in the figure), and the preheated saturated water flows from the middle manifold to the lower manifold.

[0037] The top of the side wall of the housing 301 is also provided with a smoke exhaust channel 302. In this embodiment, the smoke exhaust channel 302 is directly opposite the connection port at the top of the housing 301. A baffle 304 is provided in the middle between the connection port at the top of the smoke exhaust channel 302 and the housing 301. The baffle 304 is welded to the top plate and side wall of the housing 301 and extends vertically downward. There is a gap between the baffle 304 and the bottom plate of the housing 301, and a smoke passage is formed at this gap.

[0038] With the energy-saving device 3 in place, high-temperature flue gas flows into the housing 301 through the connection port and preheats the saturated water in the coil 303. On the one hand, the waste heat of the flue gas can be reused, and the preheated saturated water can be heated quickly, thus effectively saving resources; on the other hand, the flue gas temperature is reduced, meeting emission standards without additional treatment, simplifying the production process and improving production efficiency. In addition, the baffle 304 extends the path of the high-temperature flue gas, thereby increasing the contact time between the high-temperature flue gas and the coil 303, further improving the preheating effect of the saturated water and the cooling effect of the flue gas.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.

Claims

1. A steam-water separator for a Class D boiler, characterized in that, The furnace includes a furnace body and an evaporator tube located inside the furnace chamber. The bottom of the furnace body is equipped with a lower header, and the top of the furnace body is equipped with an upper header. The upper and lower ends of the evaporator tube are connected to the upper header and the lower header, respectively. The evaporator tube is filled with saturated water, and the top of the evaporator tube is equipped with a steam-water separation device. There is a gap between the steam-water separation device and the water surface below it. The steam-water separation device reduces the water content in the steam. The steam-water separation device includes a sealing plate set at the top opening of the evaporator tube and a screw fixedly connected to the bottom surface of the sealing plate. The screw includes a rod body and spiral blades that extend vertically around the outer surface of the rod body. The spiral blades form a spiral steam passage. The sealing plate has multiple vent holes, which are opposite to the spiral blades. Steam enters the upper header through the vent holes.

2. The steam-water separator in a Class D boiler according to claim 1, characterized in that, The evaporation tubes are distributed along the circumference at the edge of the furnace.

3. The steam-water separator in a Class D boiler according to claim 1, characterized in that, The axis of the rod coincides with the axis of the sealing plate, that is, the screw is set at the center of the bottom surface of the sealing plate.

4. The steam-water separator in a Class D boiler according to claim 1, characterized in that, The furnace body includes side walls and top and bottom plates located at the upper and lower ends of the side walls. The lower header includes a lower header bottom plate located below the furnace body bottom plate. The lower header bottom plate is annular, with a connecting channel formed at its inner ring. Cylindrical lower header inner supports and lower header outer supports are provided between the lower header bottom plate and the furnace body bottom plate from the inside to the outside. Both the lower header inner supports and lower header outer supports are located at the edge of the furnace body bottom plate.

5. The steam-water separator in a Class D boiler according to claim 4, characterized in that, The upper header includes an annular upper header cover plate located above the furnace body top plate. Between the upper header cover plate and the furnace body top plate, there are cylindrical upper header inner supports and upper header outer supports spaced from the inside to the outside. Both the upper header inner supports and upper header outer supports are located at the edge of the upper header cover plate.

6. The steam-water separator in a Class D boiler according to claim 1, characterized in that, An energy-saving device is also provided on one side of the furnace body. The energy-saving device includes a box connected to the furnace body. The box contains a layered coil that is continuously folded in the horizontal plane and extends vertically. The water outlet end of the coil is connected to the central manifold. A flue gas outlet channel is also provided on the top of the side wall of the box.

7. The D-level boiler in-furnace steam-water separator according to claim 6, characterized in that, Connection ports are provided on the top side wall of the furnace body and the top side wall of the box body, and the two are connected by pipes.

8. The D-level boiler in-furnace steam-water separator according to claim 7, characterized in that, The smoke exhaust duct is directly opposite the connection port on the top of the box. A baffle is provided in the middle of the connection port between the smoke exhaust duct and the top of the box. The baffle is fixedly connected to the top plate and side wall of the box and extends vertically downward. There is a gap between the baffle and the bottom plate of the box, which forms a smoke passage.

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