A calcining furnace for desulfurized gypsum

Abstract

This invention discloses a calcining furnace for desulfurized gypsum, comprising a calcination zone, a uniform air distribution plate, an air inlet pipe, a first uniform air distribution zone, and a second uniform air distribution zone. Both the calcination zone and the uniform air distribution plate have rectangular cross-sections. The first uniform air distribution zone includes a first uniform air distribution hood positioned below the uniform air distribution plate, with a first uniform air distribution cone at its center. The second uniform air distribution zone includes a second uniform air distribution hood positioned below the first uniform air distribution hood, with a second uniform air distribution cone at its center. High-speed airflow ejected through the air inlet pipe enters the first and second uniform air distribution zones respectively, and then flows towards the uniform air distribution plate. Compared to using a single uniform air distribution zone to form a rectangular cross-section airflow, using two uniform air distribution zones allows for adjustment of the area of ​​the circular cross-section and the four concave triangular cross-sections, thereby adjusting the airflow flow in both zones to ensure that the airflow flow is essentially the same, resulting in uniform airflow and reducing dead zones in the calcination zone.

Description

Technical Field

[0001] This invention relates to the field of fluidized bed calcining furnaces, and more specifically to a calcining furnace for desulfurized gypsum. Background Technology

[0002] Related technologies of the fluidized bed calcining furnace disclosed in this invention are as follows:

[0003] CN111646718B, A gypsum calcination system and a gypsum calcination method;

[0004] CN209113765U, A gypsum board calciner;

[0005] CN102382976B, A fluidized bed roasting furnace;

[0006] CN1197179A, A novel method and system for waste heat recovery from slag in a direct-flow fluidized bed furnace;

[0007] In recent years, various problems have occurred in the gypsum board production line. After analysis by experts and technicians, the crystal structure of the incoming desulfurized gypsum was observed and controlled using a biological microscope with magnification of 40X-1600X. The desulfurized gypsum was roasted using a large-space high-temperature resistance furnace with a power of 8KW and a furnace size of 500×500×300 to simulate the production equipment parameters. It was finally determined that the factors affecting the production stability of the gypsum board production line are closely related to the stability of the calcination quality of the raw material clinker.

[0008] To improve the stability of the calcination quality of desulfurized gypsum, it is necessary to modify the existing fluidized bed calcining furnace. The usual improvement methods are to increase the heat exchange area of ​​the calcining furnace, reduce the travel of the powder, and control the calcination temperature to improve the properties of the gypsum.

[0009] Due to the limited area of ​​the factory, it was difficult to solve the problem of how to build a larger calcining furnace on the original site. Summary of the Invention

[0010] The purpose of this invention is to provide a calcining furnace for desulfurized gypsum, so as to solve the technical problem of how to increase the heat exchange area of ​​the calcining furnace without increasing the floor space of the calcining furnace.

[0011] To solve the above-mentioned technical problems, the present invention specifically provides the following technical solution:

[0012] A calcining furnace for desulfurized gypsum includes: a calcination zone, an air distribution plate, an air inlet pipe, a first air distribution zone, and a second air distribution zone arranged sequentially from top to bottom; wherein the cross-sections of the calcination zone and the air distribution plate are both rectangular, and the air distribution plate is provided with a plurality of air distribution holes and slag discharge holes; the first air distribution zone includes a first air distribution hood disposed below the air distribution plate, the first air distribution hood being a conical shell, the lower bottom of the first air distribution hood being open and facing the air distribution plate, and a first air distribution cone disposed at the center of the first air distribution hood, the first air distribution cone being a frustum-shaped cylinder, the upper bottom of the first air distribution cone facing the air distribution plate; the second air distribution zone includes a second air distribution hood disposed below the first air distribution hood, the second air distribution hood being a frustum-shaped rectangular shell, the first air distribution zone... The bottom of the second hood is open and faces the wind distribution plate. A second wind distribution cone is provided at the center of the second wind distribution hood. The second wind distribution cone is a cone, and the tip of the second wind distribution cone faces the wind distribution plate. The air outlet of the air inlet pipe is vertically downward and faces the first wind distribution cone. A portion of the high-speed airflow ejected through the air inlet pipe is dispersed into the interior of the first wind distribution zone by the first wind distribution cone and flows upward along the first wind distribution hood. Another portion of the high-speed airflow passes through the first wind distribution cone and enters the second wind distribution zone. It is then dispersed into the interior of the second wind distribution zone by the second wind distribution cone and flows upward along the gap between the first wind distribution hood and the second wind distribution hood, so that a uniformly upward-flowing rectangular cross-section airflow appears below the wind distribution plate.

[0013] Furthermore, a ventilation gap is provided between the first air distribution hood and the air distribution plate, allowing airflow to flow between the first air distribution zone and the second air distribution zone through the ventilation gap.

[0014] Furthermore, a base is fixedly connected to the bottom of the first wind equalization hood, and the base is fixedly connected to the second wind equalization hood. The base is a vertically arranged flat plate that extends along the radial surface of the first wind equalization hood, and the extension direction of the base is toward the minimum gap between the first wind equalization hood and the second wind equalization hood.

[0015] Furthermore, the end face of the first air distribution cone facing the air inlet pipe is a slope, and the slope faces the outside of the first air distribution cone.

[0016] Furthermore, the first wind equalization cone and the first wind equalization shroud are connected by a plurality of reinforcing ribs, which are vertically arranged flat plates arranged along the radial surface of the first wind equalization cone.

[0017] Furthermore, the top of the first air distribution cone is cylindrical and has an air passage hole. An air regulating pipe is installed inside the air passage hole. The air regulating pipe is detachably connected to the first air distribution cone. The diameter of the air passage hole of the first air distribution cone can be adjusted by replacing the air regulating pipe with a different inner diameter.

[0018] Furthermore, the end face of the regulating duct facing the air inlet duct is a slope, and the slope faces the outside of the first uniform air cone.

[0019] Furthermore, the air regulating duct is threadedly connected to the first air equalization cone, and the cross-section of the inner hole of the air regulating duct is a polygonal prism shape.

[0020] Furthermore, the second air distribution hood has a mounting hole at its center, and the second air distribution cone is detachably connected to the second air distribution hood and covers the mounting hole.

[0021] Furthermore, the second wind-equalizing cone is a square pyramid shape, with the inclined surface of the second wind-equalizing cone facing the four corners of the second wind-equalizing zone.

[0022] Compared with the prior art, this application has the following advantages:

[0023] A calcining furnace for desulfurized gypsum is provided. A first air distribution zone outputs airflow with a circular cross-section to an air distribution plate, and a second air distribution zone outputs airflow with four concave triangular cross-sections to the air distribution plate to form an airflow with a rectangular cross-section. Compared with using one air distribution zone to form an airflow with a rectangular cross-section, using two air distribution zones can adjust the area of ​​the circular cross-section and the four concave triangular cross-sections, thereby adjusting the flow rate of the airflow in both zones, making the airflow flow rate of both zones basically the same, thereby making the airflow flow uniform and reducing dead corners in the calcining zone. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a cross-sectional view of an embodiment of the present invention;

[0026] Figure 2 This is a perspective view of an embodiment of the present invention;

[0027] Figure 3 for Figure 2 A 3D view concealing the calcination zone and the uniform air distribution plate;

[0028] Figure 4for Figure 3 A 3D view showing the area behind the concealed air intake duct;

[0029] Figure 5 This is a perspective view of the second wind equalization shroud and the second wind equalization cone according to an embodiment of the present invention;

[0030] The labels in the diagram represent the following:

[0031] 1-Calcination zone; 2-Evaporation plate; 21-Evaporation hole; 3-Air inlet pipe; 4-First evaporation zone; 41-First evaporation hood; 42-First evaporation cone; 43-Ventilation gap; 44-Reinforcing rib; 45-Air passage hole; 46-Adjusting pipe; 5-Second evaporation zone; 51-Second evaporation hood; 52-Second evaporation cone; 53-Mounting hole. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] The standard requirements for desulfurized gypsum entering the plant are:

[0034] The size of the desulfurized gypsum crystals is controlled between 0.05mm and 0.15mm, and the shape is long and prismatic. After being roasted at 500℃ in the laboratory, the bulk density is 700-800g, and the standard consistency water content is 0.64-0.72%. In production, the calcination system is modified to adjust the inlet temperature of the calciner to not exceed 550℃ and the temperature before cooling to not exceed 120℃. The initial setting time of the building gypsum is guaranteed to be 2-3 minutes, the final setting time to be 7-10 minutes, the bulk density to be 700-800g, and the standard consistency water content to be ≤0.65%.

[0035] Due to the limited area of ​​the factory, it was difficult to solve the problem of how to build a larger calcining furnace on the original site.

[0036] To address this issue, a desulfurized gypsum calcination furnace is provided below, which has a calcination zone 1 with a rectangular cross-section. Compared to a calcination furnace with a calcination zone 1 with a circular cross-section, the heat exchange area of ​​the calcination zone 1 with a rectangular cross-section is 20% larger.

[0037] However, dead corners exist at the four corners of the rectangular cross-section calcination zone 1, making it difficult for the airflow to flow evenly within the rectangular cross-section calcination zone 1. To solve this problem, the desulfurized gypsum calcination furnace includes:

[0038] The calcination zone 1, the air distribution plate 2, the air inlet pipe 3, the first air distribution zone 4, and the second air distribution zone 5 are arranged in the following order from top to bottom;

[0039] in,

[0040] The cross-sections of the calcination zone 1 and the uniform air distribution plate 2 are both rectangular, and the uniform air distribution plate 2 is provided with several uniform air distribution holes 21 and slag discharge holes.

[0041] The first wind equalization zone 4 includes a first wind equalization hood 41 disposed below the wind equalization plate 2. The first wind equalization hood 41 is a conical shell with its bottom open and facing the wind equalization plate 2. A first wind equalization cone 42 is disposed at the center of the first wind equalization hood 41. The first wind equalization cone 42 is a frustum-shaped cylinder with its top facing the wind equalization plate 2.

[0042] The second wind equalization zone 5 includes a second wind equalization hood 51 disposed below the first wind equalization hood 41. The second wind equalization hood 51 is a rectangular platform-shaped shell. The bottom of the first wind equalization hood 41 is open and faces the wind equalization plate 2. A second wind equalization cone 52 is disposed at the center of the second wind equalization hood 51. The second wind equalization cone 52 is a cone, and the tip of the second wind equalization cone 52 faces the wind equalization plate 2.

[0043] The air outlet of the air inlet duct 3 is vertically downward and faces the first air distribution cone 42. Part of the high-speed airflow ejected through the air inlet duct 3 is dispersed into the interior of the first air distribution zone 4 by the first air distribution cone 42 and flows upward along the first air distribution hood 41. Another part of the high-speed airflow passes through the first air distribution cone 42 and enters the second air distribution zone 5. It is then dispersed into the interior of the second air distribution zone 5 by the second air distribution cone 52 and flows upward along the gap between the first air distribution hood 41 and the second air distribution hood 51, so that a uniformly upward-flowing rectangular cross-section airflow appears below the air distribution plate 2.

[0044] The slag discharge hole is not shown in the diagram.

[0045] The first wind distribution zone 4 outputs airflow with a circular cross-section to the wind distribution plate 2, and the second wind distribution zone 5 outputs airflow with four concave triangular cross-sections to the wind distribution plate 2, so as to combine them into airflow with a rectangular cross-section.

[0046] Compared to using a single uniform airflow zone to form a rectangular cross-section, using two uniform airflow zones allows for adjustment of the area of ​​the circular cross-section and the four concave triangular cross-sections, thereby adjusting the airflow rate in both zones to ensure that the airflow rates are essentially the same, resulting in uniform airflow and reducing dead zones in calcination zone 1.

[0047] Furthermore, since the lower edge of the first air distribution hood 41 blocks the air distribution holes 21, dead corners will be generated in the calcination zone 1. To solve this problem:

[0048] A ventilation gap 43 is provided between the first wind distribution hood 41 and the wind distribution plate 2, allowing airflow to flow between the first wind distribution zone 4 and the second wind distribution zone 5 through the ventilation gap 43.

[0049] The bottom of the first wind equalization hood 41 is fixedly connected to a base, which is fixedly connected to the second wind equalization hood 51. The base is a vertically arranged flat plate that extends along the radial surface of the first wind equalization hood 41, and the extension direction of the base is toward the minimum gap between the first wind equalization hood 41 and the second wind equalization hood 51.

[0050] The base is used to support the first air distribution hood 41 and is positioned as close as possible to the location that does not affect the airflow.

[0051] Furthermore, since the end face of the first air distribution cone 42 facing the air inlet duct 3 will obstruct the airflow, resulting in energy waste, in order to solve this problem:

[0052] The end face of the first wind equalization cone 42 facing the air inlet pipe 3 is a slope, and the slope faces the outside of the first wind equalization cone 42.

[0053] Furthermore, since the first air distribution cone 42 needs to both break the airflow (disperse the airflow to the first air distribution zone 4) and allow the airflow to pass through (allow the airflow to enter the second air distribution zone 5), under the blowing of the high-speed airflow output from the air inlet pipe 3, the first air distribution cone 42 is prone to violently vibrating in the turbulent airflow. In order to improve the strength of the first air distribution cone 42 and reduce its vibration during operation:

[0054] The first wind equalization cone 42 and the first wind equalization cover 41 are connected by a plurality of reinforcing ribs 44, which are vertically arranged flat plates arranged along the radial surface of the first wind equalization cone 42.

[0055] Furthermore, after the calcining furnace is assembled, it needs to be debugged. After adjusting the flow rate and velocity of the airflow output from the air inlet pipe 3, the flow rates of the airflow output from the first air equalization zone 4 and the second air equalization zone 5 may not always be the same. In order to adjust the flow rates of the airflow output from the first air equalization zone 4 and the second air equalization zone 5 so that they are always the same:

[0056] The top of the first air equalization cone 42 is cylindrical and has an air passage hole 45. An air regulating pipe 46 is installed inside the air passage hole 45. The air regulating pipe 46 is detachably connected to the first air equalization cone 42. The diameter of the air passage hole 45 of the first air equalization cone 42 can be adjusted by replacing the air regulating pipe 46 with a different inner diameter.

[0057] For the same reason, to avoid the end face of the air duct 46 blocking the high-speed airflow output from the air inlet duct 3:

[0058] The end face of the air regulating duct 46 facing the air inlet duct 3 is a slope, and the slope faces the outside of the first air equalization cone 42.

[0059] For easy disassembly and assembly of air duct 46:

[0060] The air regulating duct 46 is threadedly connected to the first air equalization cone 42, and the cross-section of the inner hole of the air regulating duct 46 is a polygonal prism shape.

[0061] The second wind distribution shroud 51 has a mounting hole 53 at its center. The second wind distribution cone 52 is detachably connected to the second wind distribution shroud 51 and covers the mounting hole 53.

[0062] By disassembling the second air distribution cone 52, the installation position of the air regulating duct 46 can be exposed, and the staff can disassemble and install the air regulating duct 46 through the mounting hole 53.

[0063] Furthermore, the second wind equalization cone 52 is a square pyramid shape, with its inclined surface facing the four corners of the second wind equalization zone 5. The airflow passing through the air passage 45 is reflected by the inclined surface to the four corners of the second wind equalization zone 5, thereby increasing the airflow velocity within the second wind equalization zone 5.

[0064] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered as falling within the scope of protection of the embodiments of the present invention.

Claims

1. A calcination furnace for desulfurized gypsum, characterized in that including: a calcination zone (1), an air distribution plate (2), an air inlet pipe (3), a first air distribution zone (4) and a second air distribution zone (5) are sequentially arranged from top to bottom; wherein the cross-sections of the calcination zone (1) and the air distribution plate (2) are both rectangular, and a number of air distribution holes (21) and slag discharge holes are provided on the air distribution plate (2); the first air distribution zone (4) includes a first air distribution hood (41) arranged below the air distribution plate (2), the first air distribution hood (41) is a conical shell, the lower bottom of the first air distribution hood (41) is open and faces the air distribution plate (2), a first air distribution cone (42) is arranged at the center of the first air distribution hood (41), the first air distribution cone (42) is a frustum-shaped cylinder, and the upper bottom of the first air distribution cone (42) faces the air distribution plate (2); the second air distribution zone (5) includes a second air distribution hood (51) arranged below the first air distribution hood (41), the second air distribution hood (51) is a rectangular frustum-shaped shell, the lower bottom of the first air distribution hood (41) is open and faces the air distribution plate (2), a second air distribution cone (52) is arranged at the center of the second air distribution hood (51), the second air distribution cone (52) is a cone, and the tip of the second air distribution cone (52) faces the air distribution plate (2); the air outlet of the air inlet pipe (3) is arranged vertically downward and faces the first air distribution cone (42), a part of the high-speed air flow ejected through the air inlet pipe (3) is dispersed by the first air distribution cone (42) into the interior of the first air distribution zone (4), and flows upward along the first air distribution hood (41), and another part of the high-speed air flow passes through the first air distribution cone (42) and enters the second air distribution zone (5), and then is dispersed by the second air distribution cone (52) into the interior of the second air distribution zone (5), and flows upward along the gap between the first air distribution hood (41) and the second air distribution hood (51), so as to cause a uniformly upward flowing rectangular cross-section air flow to appear below the air distribution plate (2).

2. The calcination furnace for desulfurized gypsum according to claim 1, characterized in that a ventilation gap (43) is provided between the first air distribution hood (41) and the air distribution plate (2), and air flow can flow between the first air distribution zone (4) and the second air distribution zone (5) through the ventilation gap (43).

3. The calcination furnace for desulfurized gypsum according to claim 2, characterized in that a base is fixedly connected to the bottom of the first air distribution hood (41), the base is fixedly connected to the second air distribution hood (51), the base is a vertically arranged flat plate, the base extends along the radial surface of the first air distribution hood (41), and the extending direction of the base faces the minimum of the gap between the first air distribution hood (41) and the second air distribution hood (51).

4. The calcination furnace for desulfurized gypsum according to claim 1, characterized in that The end face of the first air-distributing cone (42) facing the air inlet pipe (3) is a slope surface, and the slope surface faces the outside of the first air-distributing cone (42).

5. The calcination furnace for desulfurized gypsum according to claim 1, characterized in that The first air-distributing cone (42) and the first air-distributing hood (41) are connected by a plurality of reinforcing ribs (44). The reinforcing ribs (44) are vertically arranged and are flat plates arranged along the radial plane of the first air-distributing cone (42).

6. The calcination furnace for desulfurized gypsum according to claim 1, characterized in that The top of the first air-distributing cone (42) is in the shape of a cylinder and is provided with an air passing hole (45). An air adjusting pipe (46) is installed inside the air passing hole (45). The air adjusting pipe (46) is detachably connected to the first air-distributing cone (42). By replacing the air adjusting pipes (46) with different inner diameters, the aperture of the air passing hole (45) of the first air-distributing cone (42) is adjusted.

7. The calcination furnace for desulfurized gypsum according to claim 6, characterized in that The end face of the air adjusting pipe (46) facing the air inlet pipe (3) is a slope surface, and the slope surface faces the outside of the first air-distributing cone (42).

8. The calcination furnace for desulfurized gypsum according to claim 6, characterized in that The air adjusting pipe (46) is threadedly connected to the first air-distributing cone (42), and the cross-section of the inner hole of the air adjusting pipe (46) is in the shape of a prism.

9. The calcination furnace for desulfurized gypsum according to claim 6, characterized in that An installation hole (53) is provided at the center of the second air-distributing hood (51). The second air-distributing cone (52) is detachably connected to the second air-distributing hood (51) and covers the installation hole (53).

10. The calcination furnace for desulfurized gypsum according to claim 1, characterized in that The second air-distributing cone (52) is in the shape of a quadrangular pyramid, and the inclined surface of the second air-distributing cone (52) faces the four corners of the second air-distributing area (5).

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