Boiler including shielded heat plate structure

Abstract

The utility model relates to a boiler including a shielded heat plate structure. The boiler including the shielded heat plate structure comprises: a boiler furnace body, including: a combustion chamber, a smoke pipe or a water pipe, a heat transfer surface of a gas collection chamber, a shielded heat plate structure, and a gas collection chamber; a boiler furnace body cover; an exhaust gas flow outlet; and a chimney, wherein the shielded heat plate structure is installed in the gas collection chamber to face the heat transfer surface of the gas collection chamber. The boiler can reduce the exhaust gas temperature to a value lower than the critical value in the prior art and prevent the generation of dew point at the same time.

Description

Technical Field

[0001] The utility model relates to a boiler comprising a shielding heat plate structure. Background Art

[0002] Generally speaking, the heat loss caused by exhaust gas in the boiler is 5-12%, which accounts for a relatively large part of the total heat loss in the boiler. Therefore, reducing the heat loss caused by exhaust gas is of great significance to improving the thermal efficiency of the boiler.

[0003] In order to reduce the heat loss caused by exhaust gas during boiler operation, it is necessary to lower the temperature of exhaust gas discharged into the atmosphere through the gas capture chamber and chimney.

[0004] If the exhaust gas temperature is excessively lowered by increasing the heat transfer area, water vapor contained in the exhaust gas condenses and then reacts with nitrogen oxides and sulfur oxides in the exhaust gas to generate acid, which corrodes the heat transfer surface and other metal parts.

[0005] Because of this, in the prior art, the exhaust gas temperature of boilers used for power production is set at 120-160°C, and the exhaust gas temperature of small and medium-sized boilers for industrial or household use with load fluctuations is set at 180-250°C.

[0006] The utility model aims to provide a boiler including a shielded heat plate structure with less material and cost, which can reduce the exhaust gas temperature in the gas collection chamber to below the critical value in the prior art by overcoming the above technical problems and prevent the generation of dew point. Utility Model Content

[0007] To improve the thermal efficiency of the boiler, more of the heat released during fuel combustion must be transferred to the heat medium through the heat transfer surface.

[0008] One of the methods is to reduce the exhaust gas temperature by improving the heat transfer characteristics, thereby reducing the heat loss generated by the exhaust gas.

[0009] In order to improve thermal efficiency (specifically, to improve the heat transfer characteristics of the boiler), the utility model provides a boiler including a shielded heat plate structure, which can reduce the exhaust gas temperature in the gas collection chamber to below the critical value in the prior art and prevent the generation of dew point.

[0010] The boiler according to the utility model is a smoke tube boiler or a water tube boiler for generating steam or warm water, and basically comprises: a boiler furnace body, including a combustion chamber, a smoke tube or a water tube, a heat transfer surface of a gas collection chamber, a shielding heat plate structure and a gas collection chamber; a boiler furnace body cover; an exhaust gas flow outlet; and a chimney.

[0011] The combustion gas generated when the fuel burns in the combustion chamber flows inside the smoke pipe or on the surface of the water pipe, and most of the heat contained in the combustion gas is transferred to the heat medium in three ways: heat radiation, heat convection and heat transfer. After that, it passes through the gas collection chamber and is discharged to the exhaust gas outlet and chimney.

[0012] The shielding heat plate structure of the boiler according to the utility model is installed inside the gas collection chamber and faces the heat transfer surface of the gas collection chamber, which can reduce the exhaust gas temperature and prevent the generation of dew point.

[0013] The heat transfer surface of the gas capture chamber refers to the upper horizontal tube plate of the smoke tube boiler, or the imaginary surface of the uppermost water tube row stacked together, which is farthest from the combustion chamber in the water tube boiler.

[0014] The cross-sectional area of ​​the shielding heat plate structure of the boiler according to the utility model is equal to the cross-sectional area of ​​the gas collection chamber minus 20-30% of the cross-sectional area of ​​the combustion chamber.

[0015] The exhaust gas passing through the edge of the shielding heat plate structure and the heat transfer surface of the gas collection chamber has a passage area within the range of 10 to 24% of the cross-sectional area of ​​the combustion chamber.

[0016] The heat shielding plate structure of the boiler of the utility model comprises a heat shielding reflecting plate on the heat transfer surface of the gas collection chamber, which can reflect the heat of the exhaust gas passing through the gas collection chamber.

[0017] According to the boiler shielding heat plate structure of the utility model, one side surface of the shielding heat reflecting plate which is not opposite to the heat transfer surface of the gas collection chamber may further include a heat-resistant insulation layer.

[0018] The shielding heat plate structure of the boiler according to the utility model also includes a fixing component for adjusting the distance between the shielding heat plate structure and the heat transfer surface of the gas collection chamber and fixing the shielding heat plate structure inside the gas collection chamber. The shielding heat plate structure of the boiler according to the utility model can also be formed into an integral structure with the boiler furnace cover.

[0019] Compared with the boilers in the prior art, the boiler provided by the utility model can reduce the exhaust gas temperature to below the critical value in the prior art with less material and cost, can also prevent the generation of dew point, extend the service life, and improve the thermal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of an inclined smoke tube boiler including a shielding heat plate structure arranged in a gas collection chamber according to an embodiment of the utility model.

[0021] Figure 2The utility model is a schematic diagram of an inclined smoke tube boiler including a shielding heat plate structure arranged in a gas collection chamber according to an embodiment of the utility model.

[0022] Figure 3 The utility model is a schematic diagram of a vertical smoke tube boiler including a shielded heat plate structure arranged in a gas collection chamber according to an embodiment of the utility model.

[0023] Figure 4 It is a three-dimensional view of a horizontal water tube boiler including a shielded heat plate structure arranged in a gas collection chamber according to an embodiment of the utility model.

[0024] Figure 5 The utility model is a schematic diagram of a horizontal water tube boiler including a shielded heat plate structure arranged in a gas collection chamber according to an embodiment of the utility model.

[0025] Figure 6 The utility model is a schematic diagram of a boiler with an inclined smoke tube boiler in which a boiler furnace cover and a heat shielding plate structure are formed as an integral structure according to an embodiment of the utility model.

[0026] Figure 7 The utility model is a schematic diagram of a horizontal water tube boiler in which a boiler furnace cover and a shielding heat plate structure are formed as an integral structure according to an embodiment of the utility model.

[0027] Figure 8 It is a partial detailed diagram of a shielded heat plate structure according to an embodiment of the utility model.

[0028] Fig. 9 It is a principle diagram of an inclined smoke tube boiler in which a boiler furnace cover and a shielding heat plate structure are formed as an integral structure according to another embodiment of the utility model.

[0029] Fig.10 The utility model is a schematic diagram of the exhaust gas passage area between the edge of the shielding heat plate structure and the heat transfer surface of the gas collection chamber in a smoke tube boiler according to an embodiment of the utility model.

[0030] 1: Combustion chamber, 2: Heat medium, 3: Heat transfer surface of gas collection chamber (hypothetical surface of the upper horizontal tube plate of smoke tube boiler and the upper water tube row farthest from the combustion chamber of water tube boiler), 31: Heat medium inlet, 32: Heat medium outlet, 4: Shielding heat plate structure, 40: Fixing member for fixing the shielding heat plate structure in the gas collection chamber, 41: Shielding heat reflection plate, 42: Heat-resistant insulation layer, 43 : Sand, 44: Handle of the shielding hot plate structure, 5: Smoke pipe, 6: Gas collection chamber, 7: Exhaust gas flow outlet, 71: Monitoring / cleaning port for soot or ash deposited on the heat transfer surface of the gas collection chamber, 72: Cleaning port for soot or ash deposited on the chimney, 8: Boiler furnace cover, 9: Chimney, 10: Water pipe, 11: Boiler furnace, 12: Passing area portion of the exhaust gas passing through between the edge of the shielding hot plate structure and the heat transfer surface of the gas collection chamber. DETAILED DESCRIPTION

[0031] In order to provide a clearer understanding of the technical solution for achieving the purpose of the utility model, the utility model is further described below in conjunction with the accompanying drawings.

[0032] The shielded heat plate structure and the inclined smoke tube boiler, vertical smoke tube boiler and horizontal water tube boiler including the same as shown in the embodiments and drawings are only preferred embodiments of the present utility model and do not limit the protection scope of the present utility model.

[0033] According to the embodiment of the utility model, the cross-sectional area of ​​the combustion chamber of the boiler is 0.0346 m2, and the cross-sectional area of ​​the chimney is 8% of the cross-sectional area of ​​the combustion chamber.

[0034] In the embodiment of the present invention, propane gas is used as fuel and water is used as heat medium.

[0035] The exhaust gas temperature of the embodiment of the present utility model is the exhaust gas temperature measured in the space where the exhaust gas flow outlet 7 ends and the chimney 9 begins.

[0036] Embodiment 1:

[0037] As attached Figure 1 ~Attached Figure 3 As shown, the smoke tube boiler with a shielded heat plate structure according to an embodiment of the utility model basically includes: a boiler furnace body 11, including a combustion chamber 1, a heat medium 2 surrounding the combustion chamber 1, a smoke tube 5 and an upper horizontal tube plate 3 as a heat transfer surface for transferring heat to the heat medium 2, a shielded heat plate structure 4 and a gas collection chamber 6; a boiler furnace body cover 8; an exhaust gas flow outlet 7; and a chimney 9.

[0038] The gas collection chamber 6 herein is a space surrounded by the boiler body cover 8 and the upper horizontal tube plate 3 and having an inlet to the exhaust gas flow outlet 7 .

[0039] The heat transfer surface of the gas capture chamber is the upper horizontal tube sheet 3. Therefore, the reference number "3" can also be applied to the heat transfer surface of the gas capture chamber.

[0040] The shielding heat plate structure 4 is installed in the gas collection chamber 6 to face the heat transfer surface 3 of the gas collection chamber.

[0041] The boiler body 11 has an inlet 31 and an outlet 32 ​​, and the heat medium 2 flows in through the inlet 31 at the lower side of the body and flows out through the outlet 32 ​​at the upper side of the body.

[0042] At the exhaust gas flow outlet 7 there is a monitoring / cleaning opening 71 for the soot or ash deposited on the heat transfer surface 3 of the gas capture chamber and a cleaning opening 72 for the soot or ash deposited on the chimney 9 .

[0043] In one embodiment of the utility model, the cross-sectional area of ​​the heat shielding plate structure 4 of the smoke tube boiler is the same as the cross-sectional area of ​​the heat shielding reflective plate 41, and is equal to the cross-sectional area of ​​the gas collection chamber 6 minus 20-30% of the cross-sectional area of ​​the combustion chamber. The exhaust gas passage area 12 for the exhaust gas to pass through between the edge of the heat shielding plate structure 4 and the heat transfer surface 3 of the gas collection chamber is within the range of 10-24% of the cross-sectional area of ​​the combustion chamber. Here, the exhaust gas passage area 12 for the exhaust gas to pass through between the edge of the heat shielding plate structure 4 and the heat transfer surface 3 of the gas collection chamber is as shown in the attached figure. Fig.10 Similarly, the side area of ​​the spatial figure obtained by vertically projecting the shielding heat plate structure 4 onto the heat transfer surface 3 of the gas collection chamber.

[0044] At this time, the geometric center of the cross section of the shielding heat plate structure 4 is consistent with the geometric center of the cross section of the boiler.

[0045] According to the attached Figure 8 The shielding heat plate structure 4 of the boiler of one embodiment of the utility model shown in the figure comprises: a shielding heat reflecting plate 41; a fixing component 40, which adjusts the distance between the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber, and fixes the shielding heat plate structure 4 in the gas collection chamber (that is, fixed on the upper horizontal tube plate 3 or the boiler furnace cover 8); and a heat-resistant insulation layer 42, which is located on the side of the shielding heat reflecting plate 41 that is not facing the heat transfer surface 3 of the gas collection chamber.

[0046] According to the embodiment of the utility model, the shielding heat reflecting plate 41 of the shielding heat plate structure 4 of the boiler not only reflects a part of the radiation energy of the exhaust gas passing through the smoke pipe 5 to the gas collection chamber 6 on the heat transfer surface 3 of the gas collection chamber, but also strengthens the convection heat transfer process. During the convection heat transfer process, the exhaust gas flows at an extremely fast speed in the narrow space between the shielding heat reflecting plate 41 and the heat transfer surface 3 of the gas collection chamber.

[0047] In this way, the passage path of the combustion gas is extended to prolong the residence time of the combustion gas inside the boiler and prevent the generation of dead zones where heat exchange is inefficient on the heat transfer surface, thereby improving the heat transfer efficiency.

[0048] The material of the heat shielding reflective plate 41 in the embodiment of the utility model can be stainless steel or carbon steel.

[0049] In one embodiment of the present invention, stainless steel 1Cr18Ni9 is utilized.

[0050] The material of the heat-resistant thermal insulation layer 42 can be heat-resistant glass fiber, foamed vermiculite or coal slag, etc. In one embodiment of the present invention, coal slag is used.

[0051] The heat-resistant heat-insulating layer 42 of the heat-shielding plate structure 4 of the boiler according to the present invention can further enhance the heat-shielding efficiency of the heat-shielding reflective plate 41 .

[0052] The fixing component of the embodiment of the utility model can be fixed on the heat transfer surface of the gas collection chamber or the boiler furnace cover by using the general means that have been spread in the relevant technical field.

[0053] In order to adjust the distance between the shielding heat plate structure of one embodiment of the utility model and the heat transfer surface 3 of the gas collection chamber, four sets of fixing components 40 (each set includes bolts and nuts) are fixed to the heat transfer surface 3 of the gas collection chamber or the boiler furnace cover 8 by welding.

[0054] Attached Figure 6 and attached Fig. 9 The inclined smoke tube boiler of one embodiment of the utility model shown includes a heat shielding plate structure 4 integrated with the boiler furnace cover.

[0055] In order to compare and analyze the heat transfer characteristics of the smoke tube boiler according to the present invention in relation to the cross-sectional area of ​​the heat shielding plate structure 4 (ie, the cross-sectional area of ​​the heat shielding reflective plate 41 ), an experiment was conducted under the same combustion conditions.

[0056] At this time, the heat shielding plate structure 4 is installed at a position spaced 10 mm from the heat transfer surface 3 of the gas collection chamber.

[0057] The steam generated in the inclined smoke tube boiler model and the vertical smoke tube boiler model is collected through the outflow port 32 in containers filled with 4 L of water, respectively.

[0058] In the case of the inclined smoke tube boiler model, the diameter of the boiler furnace is 210㎜, the height of the boiler furnace is 210㎜, and the heat transfer area is 0.325㎡.

[0059] In the case of the vertical smoke tube boiler model, the diameter of the boiler furnace is 210㎜, the height of the boiler furnace is 230㎜, and the heat transfer area is 0.336㎡.

[0060] The water temperature before the experiment was 16°C, and the experiment lasted from the time steam generation started to within 6 minutes.

[0061] After the experiment, the water temperature was measured after the water in the container was fully stirred.

[0062] The exhaust gas temperatures of the inclined smoke tube boiler and the vertical smoke tube boiler without a shielding heat plate structure in the gas collection chamber are 230°C and 260°C respectively.

[0063] Table 1 shows the experimental results of the inclined smoke tube boiler, and Table 2 shows the experimental results of the vertical smoke tube boiler.

[0064] Table 1. Comparative analysis of heat transfer characteristics of inclined smoke tube boilers

[0065]

[0066] ※A: The difference between the cross-sectional area of ​​the gas collection chamber and the cross-sectional area of ​​the heat shielding plate structure

[0067] G: Cross-sectional area of ​​combustion chamber

[0068] Table 2. Comparative analysis of heat transfer characteristics of vertical smoke tube boilers

[0069]

[0070] ※A: The difference between the cross-sectional area of ​​the gas collection chamber and the cross-sectional area of ​​the heat shielding plate structure

[0071] G: Cross-sectional area of ​​combustion chamber

[0072] It can be seen from Tables 1 and 2 that if the cross-sectional area of ​​the heat shielding plate structure (i.e., the cross-sectional area of ​​the heat shielding reflector plate) is too large, incomplete combustion of the fuel will occur, but if it is too small, the heat shielding plate structure will not be very effective in terms of heat transfer characteristics.

[0073] The experiment proved that when the cross-sectional area of ​​the heat shielding plate structure (i.e., the cross-sectional area of ​​the heat shielding reflective plate) is equal to the cross-sectional area of ​​the gas collection chamber minus 20-30% of the cross-sectional area of ​​the combustion chamber, the fuel can burn fully and the heat transfer characteristics are improved.

[0074] In order to compare and analyze the heat transfer characteristics of the exhaust gas passing through the edge of the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber of the inclined smoke tube boiler or the vertical smoke tube boiler according to another embodiment of the utility model, an experiment was carried out under the same combustion conditions.

[0075] The steam generated in the inclined smoke tube boiler model and the vertical smoke tube boiler model is collected through the outflow port 32 in containers filled with 4 L of water, respectively.

[0076] In the case of an inclined smoke tube boiler, the diameter of the boiler body is 210㎜, the height of the boiler body is 210㎜, and the total heat transfer area is 0.325㎡.

[0077] In the case of a vertical smoke tube boiler, the diameter of the boiler furnace is 210㎜, the height of the boiler furnace is 230㎜, and the total heat transfer area is 0.336㎡.

[0078] The water temperature before the experiment was 16°C, and the test time was from the beginning of steam generation to within 6 minutes.

[0079] After the test, the water temperature was measured after the water in the container was fully stirred.

[0080] At this time, the diameter of the heat shielding plate structure (ie, the diameter of the heat shielding reflecting plate 41) is 180 mm, and the cross-sectional area of ​​the heat shielding plate structure is equal to the cross-sectional area of ​​the gas collection chamber 6 minus 26% of the cross-sectional area of ​​the combustion chamber.

[0081] Tables 3 and 4 show the experimental results.

[0082] Table 3. Comparative analysis of the heat transfer characteristics of the inclined smoke tube boiler based on the exhaust gas passing area between the edge of the shielding heat plate structure and the heat transfer surface of the gas collection chamber

[0083]

[0084] ※d: The distance between the heat shielding reflective plate of the heat shielding plate structure including the heat shielding reflective plate and the heat-resistant insulation layer and the heat transfer surface of the gas collection chamber. ∞ means that the heat shielding plate structure is not provided.

[0085] *: Distance between the heat-shielding reflective plate of the heat-shielding plate structure without a heat-resistant insulation layer and the heat transfer surface of the gas collection chamber

[0086] Table 4. Comparative analysis of heat transfer characteristics of vertical smoke tube boilers based on the exhaust gas passing area between the edge of the shielded heat plate structure and the heat transfer surface of the gas collection chamber

[0087]

[0088]

[0089] ※d: The bottom of the heat shielding plate structure including the heat shielding plate and the heat-resistant insulation layer is the distance between the heat shielding plate and the heat transfer surface of the gas collection chamber. ∞ means that the heat shielding plate structure is not installed.

[0090] ※*: The distance between the heat shielding reflective plate and the heat transfer surface of the gas collection chamber under the heat shielding plate structure without heat-resistant insulation layer

[0091] It can be seen from Tables 3 and 4 that if the exhaust gas passing through the edge of the shielded heat plate structure and the heat transfer surface of the gas collection chamber is too small, incomplete combustion of the fuel will occur. If it is too large, the effect of the shielded heat plate structure in terms of heat transfer characteristics will be reduced.

[0092] Experiments have shown that when the exhaust gas passage area is within the range of 10 to 24% of the cross-sectional area of ​​the combustion chamber, the fuel burns best, thereby improving the heat transfer characteristics.

[0093] Embodiment 2:

[0094] According to the attached Figure 4 , 5, 7, the water tube boiler with a shielded heat plate structure according to the embodiment of the utility model mainly includes: a boiler furnace body 11, including a combustion chamber 1, a heat medium 2, a water pipe 10 surrounding the heat medium 2 and serving as a heat transfer surface for transferring heat to the heat medium 2, a shielded heat plate structure 4 and a gas collection chamber 6; a boiler furnace body cover 8; an exhaust gas flow outlet 7; and a chimney 9.

[0095] Here, the gas collection chamber 6 is a space surrounded by the boiler furnace cover 8 and the uppermost imaginary surface of the contact water pipe farthest from the combustion chamber 1 and leading to the inlet of the exhaust gas flow outlet 7.

[0096] The uppermost imaginary surface of the water tube contacting the water tube in the water tube boiler which is farthest from the combustion chamber 1 is regarded as the heat transfer surface 3 of the gas capture chamber.

[0097] The shielding heat plate structure 4 is installed in the gas collection chamber 6 to face the heat transfer surface 3 of the gas collection chamber.

[0098] The boiler body 11 has an inlet 31 and an outlet 32 ​​for allowing the heat medium 2 to flow in and out. At this time, the heat medium 2 flows in through the inlet 31 at the bottom of the body and flows out through the outlet 32 ​​at the top of the body.

[0099] At the exhaust gas flow outlet 7 there is a monitoring / cleaning port 71 for the soot and ash deposited on the heat transfer surface 3 of the gas capture chamber and a cleaning port 72 for cleaning the soot and ash deposited on the chimney 9 .

[0100] The cross-sectional area of ​​the shielding heat plate structure 4 of the water tube boiler according to the embodiment of the utility model is the same as the cross-sectional area of ​​the shielding heat reflecting plate 41, and is equal to the cross-sectional area of ​​the gas collection chamber 6 minus 20-30% of the cross-sectional area of ​​the combustion chamber. The exhaust gas passing area 12 passing between the edge of the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber is within the range of 10-24% of the cross-sectional area of ​​the combustion chamber. The exhaust gas passing area 12 passing between the edge of the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber is the side area of ​​the spatial figure obtained when the shielding heat plate structure 4 is vertically projected on the heat transfer surface of the gas collection chamber 3.

[0101] At this time, the geometric center of the cross section of the shielding heat plate structure 4 is consistent with the geometric center of the cross section of the boiler.

[0102] According to the attached Figure 8 The shielding heat plate structure 4 of one embodiment of the utility model shown includes: a shielding heat reflecting plate 41; a fixing component 40, which adjusts the distance between the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber, and fixes the shielding heat plate structure 4 inside the gas collection chamber (that is, fixed on the boiler furnace cover 8); a heat-resistant insulation layer 42, which is located on the side of the shielding heat reflecting plate 41 that is not facing the heat transfer surface 3 of the gas collection chamber.

[0103] In the shielding heat reflecting plate 41 of the shielding heat plate structure 4 of the water tube boiler according to the embodiment of the utility model, not only the heat radiation of the exhaust gas passing through the outside of the water tube and then flowing into the gas collection chamber 6 to the heat transfer surface 3 of the gas collection chamber is strengthened, but also the convection heat transfer process of the exhaust gas passing through the narrow space between the shielding heat reflecting plate 41 and the heat transfer surface 3 of the gas collection chamber at an extremely fast speed is strengthened.

[0104] In this way, the passage path of the combustion gas is extended to prolong the residence time of the combustion gas inside the boiler and allow the combustion gas to flow evenly on all heat transfer surfaces, thereby improving the heat transfer effect.

[0105] The material of the heat shielding reflective plate 41 in the embodiment of the utility model can be stainless steel or carbon steel.

[0106] In one embodiment of the present invention, stainless steel 1Cr18Ni9 is used.

[0107] The material of the heat-resistant thermal insulation layer 42 can be heat-resistant glass fiber, foamed vermiculite, coal slag, etc. In one embodiment of the utility model, coal slag is used.

[0108] According to the embodiment of the utility model, the heat-resistant heat-insulating layer 42 of the heat-shielding plate structure 4 of the boiler strengthens the heat-shielding effect of the heat-shielding reflecting plate 41 .

[0109] The fixing component of the embodiment of the utility model can be fixed on the heat transfer surface of the gas collection chamber or the boiler furnace cover by using the general means that have been spread in the related prior art.

[0110] In one embodiment of the present invention, in order to adjust the distance between the shielding heat plate structure 4 and the heat transfer surface 3 of the gas collection chamber, four sets of fixing components 40 (each set includes bolts and nuts) are fixed to the boiler furnace cover 8 by welding.

[0111] Attached Figure 7 Another embodiment of a horizontal water tube boiler is shown including a shielded heat plate structure integrally formed with the boiler furnace cover.

[0112] In order to compare and analyze the heat transfer characteristics of the cross-sectional area of ​​the shielding heat plate structure (i.e., the cross-sectional area of ​​the shielding heat reflecting plate 41) of the horizontal water tube boiler according to the utility model, experiments were conducted under the same combustion conditions.

[0113] At this time, the heat shielding plate structure 4 is installed at a position spaced 10 mm from the heat transfer surface 3 of the gas collection chamber.

[0114] The steam generated in the horizontal water tube boiler model is collected through the outflow port 32 in a container filled with 4 L of water.

[0115] In the case of a horizontal water tube boiler, the diameter of the boiler furnace is 210㎜, the height of the boiler furnace is 210㎜, and the total heat transfer area is 0.379㎡.

[0116] The water temperature before the experiment was 16°C, and the experiment lasted from the start of steam generation to 6 minutes.

[0117] After the experiment, the water in the container was fully stirred and the water temperature was measured.

[0118] The exhaust gas temperature of a horizontal water tube boiler without a shielding heat plate structure in the gas collection chamber is 170°C.

[0119] Table 5 shows the experimental results.

[0120] Table 5. Comparative analysis of heat transfer characteristics of horizontal water tube boilers

[0121]

[0122]

[0123] ※A: The difference between the cross-sectional area of ​​the gas collection chamber and the cross-sectional area of ​​the heat shielding plate structure

[0124] G: Cross-sectional area of ​​combustion chamber

[0125] It can be seen from Table 5 that if the cross-sectional area of ​​the heat shielding plate structure is too large, incomplete combustion of the fuel will occur, and if it is too small, the heat shielding plate structure will not be very effective in terms of heat transfer characteristics.

[0126] When the cross-sectional area of ​​the shielded heat plate structure is equal to the cross-sectional area of ​​the gas collection chamber minus 20-30% of the cross-sectional area of ​​the combustion chamber, the fuel burns very fully and improves the heat transfer characteristics.

[0127] In order to compare and analyze the heat transfer characteristics of the exhaust gas passing through the edge of the shielded heat plate structure 4 of the horizontal water tube boiler according to another embodiment of the utility model and the heat transfer surface 3 of the gas collection chamber through the area 12, an experiment was carried out under the same combustion conditions.

[0128] The steam generated in the horizontal water tube boiler model is collected through the outflow port 32 in a container filled with 4 L of water.

[0129] In the case of a horizontal water tube boiler, the diameter of the boiler furnace is 210㎜, the height of the boiler furnace is 210㎜, and the total heat transfer area is 0.379㎡.

[0130] The water temperature before the experiment was 16°C, and the experiment lasted from the start of steam generation to within 6 minutes.

[0131] After the experiment, the water in the container was fully stirred and the water temperature was measured.

[0132] At this time, the diameter of the shielding heat plate structure 4 is 180 mm, and its cross-sectional area is equal to the cross-sectional area of ​​the gas collection chamber 6 minus 26% of the cross-sectional area of ​​the combustion chamber.

[0133] Table 6 shows the experimental results.

[0134] Table 6. Comparative analysis of the heat transfer characteristics of the exhaust gas passing through the heat transfer surface of the gas collection chamber and the edge of the shielded heat plate structure for horizontal water tube boilers

[0135]

[0136]

[0137] ※d: The lower side of the heat shielding plate structure including the heat shielding plate and the heat-resistant insulation layer is the distance between the heat shielding plate and the heat transfer surface of the gas collection chamber. ∞ means that the heat shielding plate structure is not provided.

[0138] ※*: The distance between the heat shielding reflective plate and the heat transfer surface of the gas collection chamber under the heat shielding plate structure without heat-resistant insulation layer

[0139] It can be seen from Table 6 that if the exhaust gas passing through the edge of the shielded heat plate structure and the heat transfer surface of the gas collection chamber is too small, incomplete combustion of the fuel will occur. If it is too large, the shielded heat plate structure will not be very effective in terms of heat transfer characteristics.

[0140] Experiments have shown that when the exhaust gas passage area is within the range of 10 to 24% of the cross-sectional area of ​​the combustion chamber, the fuel burns fully and the heat transfer characteristics are improved.

[0141] That is, under the same combustion conditions, when the heat transfer area of ​​the boiler according to the utility model with a reasonably set shielding heat plate structure is as large as the heat transfer area of ​​the boiler in the prior art, the convective heat transfer characteristics and the radiant heat transfer characteristics of the boiler according to the utility model are improved, resulting in increased heat transfer, reduced exhaust gas temperature, and improved thermal efficiency.

[0142] The technical solution of the utility model can be used in heat exchange equipment with heat radiation and heat convection.

[0143] The protection scope of the present invention is not limited to the embodiments proposed in the present invention. As long as it does not deviate from the concept of the technical solution provided in the present invention, any changes, modifications, equivalent replacements and improvements to the embodiments are within the protection scope of the present invention.

Claims

1. A boiler comprising a shielded heat plate structure, characterized in that: The boiler including the shielded heat plate structure includes: The boiler body (11) comprises a combustion chamber (1), Smoke pipe (5) or water pipe (10), Heat transfer surface of gas collection chamber (3), Shielding heat plate structure (4), and Gas capture chamber (6); Boiler furnace cover (8); an exhaust gas flow outlet (7); and Chimney (9), The shielding heat plate structure (4) is installed in the gas collection chamber (6) to face the heat transfer surface (3) of the gas collection chamber.

2. The boiler comprising a shielded heat plate structure according to claim 1, characterized in that: The cross-sectional area of ​​the shielded heat plate structure (4) is equal to the cross-sectional area of ​​the gas collection chamber (6) minus 20-30% of the cross-sectional area of ​​the combustion chamber (1).

3. The boiler comprising a shielded heat plate structure according to claim 2, characterized in that: The exhaust gas passage area (12) passing through the edge of the shielding heat plate structure (4) and the heat transfer surface (3) of the gas collection chamber is within the range of 10 to 24% of the cross-sectional area of ​​the combustion chamber (1).

4. The boiler comprising a shielded heat plate structure according to claim 3, characterized in that: The heat shielding plate structure (4) comprises a heat shielding reflective plate (41).

5. The boiler comprising a shielded heat plate structure according to claim 4, characterized in that: The heat shielding plate structure (4) further comprises a heat-resistant thermal insulation layer (42), wherein the heat-resistant thermal insulation layer (42) is located on a side of the heat shielding reflective plate (41) that is not facing the heat transfer surface (3) of the gas capture chamber.

6. The boiler comprising a shielded heat plate structure according to claim 4 or 5, characterized in that: The shielding heat plate structure (4) also includes a fixing component (40) for adjusting the distance between the shielding heat plate structure (4) and the heat transfer surface (3) of the gas collection chamber and fixing the shielding heat plate structure (4) inside the gas collection chamber (6).

7. The boiler comprising a shielded heat plate structure according to claim 3 or 4, characterized in that: The heat shielding plate structure (4) and the boiler furnace cover (8) form an integral structure.

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