Thermal power plant boiler room step heat preservation outer enclosure system

Abstract

The invention provides a thermal power plant boiler room step heat preservation outer enclosure system, which is characterized in that an indoor space of a boiler room is divided into five areas from bottom to top, a masonry wall is built on the outer side of a structural frame column of a low-temperature I area, and a heat preservation plate with the thickness of delta is fully pasted on the outer side of the masonry wall; a first metal composite profiled wallboard with the thickness of a heat preservation layer being 1.1-1.3 times delta is laid on the outer side of the structural frame column of the low-temperature area II; a second metal composite profiled wallboard with the thermal insulation layer thickness being delta is laid on the outer side of the structural frame column in the temperature comfort area; third metal composite profiled wallboards with the thermal insulation layer thickness being 0.7-0.9 time delta are laid on the outer sides of the structural frame columns of the high-temperature zone I and the high-temperature zone II; and a fourth metal composite profiled roof panel with the thermal insulation layer thickness being 0.7-0.9 time delta is laid on the structural frame beam of the high-temperature area II. The problems that in winter, the temperature difference in a boiler room of a thermal power plant is too large, and bottom layer heat loss is serious are effectively solved, and the indoor thermal environment is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of exterior enclosure design of boiler rooms in thermal power plants in severe cold regions, and in particular relates to a stepped thermal insulation exterior enclosure system for boiler rooms in thermal power plants. Background Art

[0002] Since the boiler room of a thermal power plant has a large span and a high internal space (nearly 100 meters in height), the platforms on each floor are interconnected. At the same time, the boiler equipment dissipates a large amount of heat into the boiler room during operation. Affected by the heat dissipation of the equipment and the upward and downward convection of indoor hot and cold air, the indoor temperature distribution is extremely uneven, especially in the winter in cold regions, where the temperature difference between the upper and lower parts of the boiler room is even greater. Figure 1 This is a cross-sectional diagram of the measured temperature distribution in the boiler room in winter. The following table shows the temperature values ​​at different heights.

[0003] Internal air temperature at different heights in the boiler room

[0004] high ground 14m 28m 40m 50m 60m 73m 85m roof temperature 4.8℃ 7.2℃ 14.3℃ 20.2℃ 25.4℃ 26.3℃ 29.4℃ 35.5℃ 44.7℃

[0005] It can be seen that the indoor temperature difference between the ground and the top floor reaches 40℃, and the temperature gradient phenomenon is very obvious. Through the analysis of the wind speed test results at each height point, in the absence of external disturbances to each height area, due to the effect of thermal pressure, heat exchange cannot be fully carried out between different height areas. At present, the conventional practice is to use metal composite corrugated steel plates with the same insulation layer thickness for the walls and roofs of the boiler room's external enclosure system, increase the window area on the upper high-temperature area of ​​the exterior wall, and add heating equipment to the lower room of the boiler room. The purpose is to reduce the temperature difference between the upper and lower parts of the boiler room, reduce thermal pressure, and allow the air to circulate and exchange heat internally. However, this approach will cause the heat in the upper part of the boiler room to be quickly dissipated through the windows, and the cold air flowing into the room will drop rapidly, which will further increase the air pressure below the boiler room, causing the original hot air below to penetrate into the outdoors through the gaps in the exterior walls and doors and windows, and the temperature of the area below close to the ground will be further reduced. This not only increases the investment in heating equipment, but also wastes energy in vain, and the indoor thermal environment has not changed significantly. Summary of the invention

[0006] The present invention aims to solve the problem that the indoor temperature gradient phenomenon of the boiler room of a thermal power plant in winter in severely cold regions is very obvious, and due to the effect of thermal pressure, heat exchange cannot be fully carried out between areas at different heights. Thus, a stepped thermal insulation outer enclosure system for the boiler room of a thermal power plant is provided to improve the indoor thermal environment of the boiler room of a thermal power plant in winter in severely cold regions, provide a comfortable working environment for production and operation personnel, and save energy.

[0007] To achieve the above-mentioned purpose of the invention, the present invention provides a stepped thermal insulation perimeter protection system for boiler rooms in thermal power plants in severe cold regions, which divides the indoor space of the boiler room from bottom to top into five areas, namely: low temperature zone I, low temperature zone II, temperature comfort zone, high temperature zone I and high temperature zone II; from the ground to the boiler operation layer platform, it is divided into low temperature zone I; from above low temperature zone I to below temperature comfort zone is divided into low temperature zone II; the area with relatively comfortable indoor temperature, that is, the temperature range of 18°C ​​to 25°C is the temperature comfort zone; from above the temperature comfort zone to below the upper edge of the boiler equipment body is divided into high temperature zone I; from above high temperature zone I to the boiler room roof is divided into high temperature zone II;

[0008] The boiler room is provided with structural frame columns on the sides and structural frame beams on the upper part;

[0009] Masonry walls are built outside the structural frame columns of the low temperature zone I, and insulation boards with a thickness of δ are fully pasted on the outside of the masonry walls; the first metal composite corrugated wall panels with an insulation layer thickness of 1.1 to 1.3 times δ are laid outside the structural frame columns of the low temperature zone II; the second metal composite corrugated wall panels with an insulation layer thickness of δ are laid outside the structural frame columns of the temperature comfort zone; the third metal composite corrugated wall panels with an insulation layer thickness of 0.7 to 0.9 times δ are laid outside the structural frame columns of the high temperature zones I and II; the fourth metal composite corrugated roof panels with an insulation layer thickness of 0.7 to 0.9 times δ are laid on the structural frame beams of the high temperature zone II, wherein the thickness δ is the thickness of the insulation board that ensures the temperature comfort zone is between 18°C ​​and 25°C.

[0010] Furthermore, a first metal composite corrugated wallboard with a thermal insulation layer thickness of preferably 1.2 times δ is laid on the outer side of the structural frame column in the low temperature II zone.

[0011] Furthermore, a third metal composite corrugated wall panel with a thermal insulation layer thickness of preferably 0.8 times δ is laid on the outer side of the structural frame column of the high temperature zone I.

[0012] Furthermore, a third metal composite corrugated wall panel with an insulation layer thickness of preferably 0.8 times δ is laid on the outside of the structural frame columns of the high temperature zone II, and a fourth metal composite corrugated roof panel with an insulation layer thickness of preferably 0.8 times δ is laid on the structural frame beams of the high temperature zone II.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] First, the present invention effectively solves the problem of large temperature difference in the boiler room of a thermal power plant in winter and serious heat loss in the bottom layer, improves the indoor thermal environment, and makes the production and operation personnel work comfortably.

[0015] Secondly, the invention is simple to construct, and due to the use of a stepped insulation system, the insulation material of the outer enclosure system of the entire boiler room is reduced by about 15%.

[0016] Third, the present invention improves the indoor thermal environment through the construction of the external enclosure system, reduces the heating equipment on the ground floor, and reduces the project cost.

[0017] Fourthly, the present invention reduces the direct exchange of hot and cold air between indoor and outdoor areas and the infiltration of cold air in winter, thereby saving energy.

[0018] Fifth, the present invention does not require the installation of large windows on the exterior wall for heat dissipation, and the exterior facade material is unified, maintenance is convenient, and the visual effect is neat and beautiful. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Measured profile of boiler room temperature distribution in winter;

[0020] Figure 2 Sectional diagram of temperature zones inside the boiler room in winter;

[0021] Figure 3 Schematic diagram of the boiler room stepped insulation exterior enclosure system.

[0022] The markings in the accompanying drawings are as follows: 1-masonry wall, 2-insulation board with a thickness of δ, 3-first metal composite corrugated wall panel, 4-second metal composite corrugated wall panel, 5-third metal composite corrugated wall panel, 6-fourth metal composite corrugated roof panel, 7-structural frame column, 8-structural frame beam. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of a thermal power plant boiler room step insulation external enclosure system of the present invention in conjunction with the accompanying drawings.

[0024] Reference Figure 2According to the indoor temperature distribution characteristics of the boiler room of an existing thermal power plant in winter and the main working areas of production and operation personnel, the indoor space of the boiler room is divided into five areas from bottom to top, namely: low temperature zone I, low temperature zone II, temperature comfort zone, high temperature zone I and high temperature zone II. First, the area with a temperature range of 18℃ to 25℃ is taken as the reference area, which is the temperature comfort zone; among them, from the ground to the boiler operation platform, the indoor temperature in this area is lower than 18℃, the hot air loss is the most serious and it is the main working area for production and operation personnel, and it is designated as low temperature zone I; from above low temperature zone I to below the temperature comfort zone, the indoor temperature in this area is still lower than 18℃, but there are fewer people activities and the hot air loss is not serious, which is designated as low temperature zone II; the area with a relatively comfortable indoor temperature, that is, the temperature range of 18℃ to 25℃ is the temperature comfort zone; from above the temperature comfort zone to below the upper edge of the boiler equipment body, the indoor temperature in this area is slightly higher than 25℃, located in the middle area of ​​the boiler room, and is designated as high temperature zone I; from above the high temperature zone I to the roof of the boiler room, the indoor temperature in this area is higher than 25℃. Because there is no boiler equipment in this area and the space is relatively open, the hot air is most concentrated and the temperature is also the highest, which is designated as high temperature zone II.

[0025] The materials used for the outer wall and roof of the outer enclosure system of the boiler room of a traditional thermal power plant are metal composite corrugated steel plates with the same thickness of the insulation layer. The present invention optimizes and transforms the traditional materials and structural forms of the outer wall and roof of the building enclosure system according to the characteristics of each partition of the boiler room, and adopts a stepped insulation system. Taking the temperature comfort zone as the benchmark, since the temperature between 18℃ and 25℃ is the comfortable ambient temperature for people to work, it means that the wall material of the outer wall and the thickness of the wall insulation layer are reasonable, so this area is taken as the benchmark. The low temperature zone I is at the bottom of the boiler room. It is the main activity area of ​​personnel and the area with the highest indoor air pressure. The hot air is lost the most through the gaps in the outer wall. Therefore, the outer wall of this area adopts masonry wall materials with good sealing properties; at the same time, since this area is the area with the lowest temperature inside the boiler room, in order to enhance the insulation effect, the outer side of the masonry wall is fully covered with insulation boards. The thickness of the insulation boards is the same as that of the temperature comfort zone. In this way, the comprehensive insulation effect of the composite wall formed by the combination of masonry walls and insulation boards is better than that of the temperature comfort zone. The low temperature zone II is also in the low temperature range. Considering that it is mainly for strengthening insulation, the material is still the traditional metal composite corrugated steel plate with insulation. According to the average outdoor temperature in winter and the actual indoor temperature, it is concluded through analysis that the insulation layer thickness is thickened, and the insulation effect is obvious when it is about 20% thicker than the temperature comfort zone, which is more economical and reasonable. The temperature comfort zone still uses metal composite corrugated steel plates with traditional materials and thickness. The high temperature zone I is in the upper area of ​​the boiler room, and the temperature is slightly higher than the temperature comfort zone, so this area is mainly for heat dissipation. If the conventional insulation layer thickness is used, it is a waste of materials and not conducive to heat dissipation; according to the average outdoor temperature in winter and the actual indoor temperature, it is concluded through analysis that it is more economical and reasonable to reduce the thickness of the insulation layer by about 20% less than the temperature comfort zone, so the insulation layer thickness is about 80% of the temperature comfort zone. Metal composite corrugated steel plates are used. High temperature zone II is located at the top of the boiler room. The area of ​​the enclosure system is larger than other areas (including exterior walls and roofs). The temperature in this area is the highest, and high temperature air is most concentrated near the roof. This area is still mainly heat-dissipating. Therefore, this area makes full use of the large area of ​​exterior walls and roofs facing the outside. The walls and roofs are the same as those in high temperature zone I, and the insulation layer thickness is about 80% of that in the temperature comfort zone. Metal composite corrugated steel plates are used.

[0026] Reference Figure 3, a masonry wall 1 is built outside the structural frame column 7 of the low temperature zone I of the boiler room, and its height reaches the lower part of the low temperature zone II, and an insulation board 2 with a thickness of δ is fully pasted on the outside of the masonry wall 1, so that the masonry wall 1 and the insulation board 2 with a thickness of δ are combined to form a composite wall; a first metal composite corrugated wall panel 3 with an insulation layer thickness of 1.2 times δ is laid outside the frame column 7 of the low temperature zone II of the boiler room, and its height reaches the lower part of the temperature comfort zone; a second metal composite corrugated wall panel 3 with an insulation layer thickness of δ is laid outside the structural frame column 7 of the temperature comfort zone of the boiler room The third metal composite corrugated wall panel 5 with a thermal insulation layer thickness of 0.8 times δ is laid on the outside of the structural frame columns 7 of the high temperature zones I and II of the boiler room, and its height reaches the lower part of the high temperature zone II; the metal composite corrugated wall panel 5 with a thermal insulation layer thickness of 0.8 times δ is laid on the outside of the structural frame columns 7 of the high temperature zone II of the boiler room, and its height reaches the roof of the boiler room; the metal composite corrugated roof panel 6 with a thermal insulation layer thickness of 0.8 times δ is laid on the structural frame beams 8 of the high temperature zone II of the boiler room.

[0027] During actual application, the thickness of the insulation layer can vary according to actual conditions. Generally, the first metal composite corrugated wall panel 3 with an insulation layer thickness of 1.1 to 1.3 times δ is laid on the outside of the structural frame column 7 in the low temperature II zone; the second metal composite corrugated wall panel 4 with an insulation layer thickness of δ is laid on the outside of the structural frame column 7 in the temperature comfort zone; the third metal composite corrugated wall panel 5 with an insulation layer thickness of 0.7 to 0.9 times δ is laid on the outside of the structural frame column 7 in the high temperature I zone; the third metal composite corrugated wall panel 5 with an insulation layer thickness of 0.7 to 0.9 times δ is laid on the outside of the structural frame column 7 in the high temperature II zone; the fourth metal composite corrugated roof panel 6 with an insulation layer thickness of 0.7 to 0.9 times δ is laid on the structural frame beam 8 in the high temperature II zone, wherein the thickness δ is the thickness of the insulation board to ensure that the temperature comfort zone is between 18°C ​​and 25°C.

Claims

1. A stepped thermal insulation enclosure system for boiler rooms in thermal power plants in severe cold regions, characterized in that: The indoor space of the boiler room is divided into five areas from bottom to top, namely: low temperature zone I, low temperature zone II, temperature comfort zone, high temperature zone I and high temperature zone II; from the ground to the boiler operation layer platform, it is divided into low temperature zone I; from above low temperature zone I to below temperature comfort zone is divided into low temperature zone II; the area with relatively comfortable indoor temperature, that is, the temperature range of 18℃~25℃ is the temperature comfort zone; from above the temperature comfort zone to below the upper edge of the boiler equipment body is divided into high temperature zone I; from above high temperature zone I to the boiler room roof is divided into high temperature zone II; A structural frame column (7) is provided on the side of the boiler room, and a structural frame beam (8) is provided on the upper part; A masonry wall (1) is built outside the structural frame column (7) in the low temperature zone I, and a thermal insulation board (2) with a thickness of δ is fully pasted on the outside of the masonry wall (1); a first metal composite corrugated wall panel (3) with a thermal insulation layer thickness of 1.1 to 1.3 times δ is laid outside the structural frame column (7) in the low temperature zone II; a second metal composite corrugated wall panel (4) with a thermal insulation layer thickness of δ is laid outside the structural frame column (7) in the temperature comfort zone; and a third metal composite corrugated wall panel (5) with a thermal insulation layer thickness of 0.7 to 0.9 times δ is laid outside the structural frame column (7) in the high temperature zone I and the high temperature zone II; A fourth metal composite corrugated roof panel (6) having an insulation layer thickness of 0.7 to 0.9 times δ is laid on the structural frame beam (8) in the high temperature zone II, wherein the thickness δ is the thickness of the insulation panel to ensure that the temperature comfort zone is between 18°C ​​and 25°C.

2. According to claim 1, a boiler room step insulation enclosure system for a thermal power plant in a severe cold region, characterized in that: A first metal composite corrugated wallboard (3) with a thermal insulation layer thickness of preferably 1.2 times δ is laid on the outside of the structural frame column (7) in the low temperature II zone.

3. According to claim 1, a boiler room step insulation enclosure system for a thermal power plant in a severe cold region, characterized in that: A third metal composite corrugated wallboard (5) with a thermal insulation layer thickness of preferably 0.8 times δ is laid on the outside of the structural frame column (7) in the high temperature zone I.

4. According to claim 1, a boiler room step insulation enclosure system for a thermal power plant in a severe cold region, characterized in that: A third metal composite corrugated wall panel (5) having an insulation layer thickness of preferably 0.8 times δ is laid on the outside of the structural frame column (7) in the high temperature zone II, and a fourth metal composite corrugated roof panel (6) having an insulation layer thickness of preferably 0.8 times δ is laid on the structural frame beam (8) in the high temperature zone II.

Images