Byproduct gypsum fluidization calcining furnace

Abstract

The embodiment of the utility model provides a byproduct gypsum fluidization calcining furnace, and relates to the technical field of byproduct gypsum fluidization calcining. The byproduct gypsum fluidization calcining furnace comprises a shell, a feeding port and a discharging port are formed in the two sides of the upper end of the shell respectively, a partition plate and a vertical steam condensation heat exchange pipe are arranged in the shell, and the partition plate divides the shell into two cavities in the direction of the feeding port and the direction of the discharging port. According to the utility model, the plurality of deslagging and discharging ports are designed on the air distribution plate, so that the fault treatment in the equipment operation process and the rapid discharging in the shutdown process are ensured, the knocking wheel is driven by the rotating rod to rotate, so that the deslagging pipe is knocked by the knocking wheel, the effect of accelerating the discharging is achieved, and the device adopts steam as a heat source, so that the energy consumption is reduced. And a plurality of groups of independent heat exchange pipe networks are arranged, and accurate quality control on different water contents and different raw material feeding amounts is realized by adjusting different pressures and temperatures of steam in different pipe networks, so that the utilization rate of equipment is improved, and the energy consumption of products is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluidized calcination of by-product gypsum, in particular to a fluidized calcination furnace for by-product gypsum. Background Art

[0002] At present, my country is the world's largest producer of phosphate fertilizer and the largest producer of phosphogypsum. As of 2022, the total phosphogypsum emissions of my country's phosphate fertilizer enterprises were about 77 million tons, the utilization was about 38.8 million tons, and the comprehensive utilization rate was 50.4%. As of 2022, the total emissions of various industrial by-product gypsum in my country were about 300 million tons, the utilization of by-product gypsum was about 125 million tons, and the comprehensive utilization rate was 41.6%. At present, the total annual consumption and utilization of gypsum in my country is about 140 million tons, of which only 11 million tons is natural gypsum, and more than 90% of the gypsum raw materials are by-product gypsum; more than 90% of the by-product gypsum raw materials first need to be converted into building gypsum powder, and then used in paper-faced gypsum board, self-leveling, gypsum mortar, plaster gypsum and other fields.

[0003] In order to solve the conversion of industrial by-product gypsum raw materials into building gypsum powder, it is necessary to calcine the industrial by-product gypsum raw materials in a fluidized calcining furnace. The fluidized calcining furnace fluidizes the bed by blowing an appropriate amount of air from the bottom of the main body. The existing fluidized furnace usually has a slag discharge and discharge port. Therefore, when a failure occurs during the operation of the equipment, it is not convenient to discharge the material quickly. Secondly, the heat exchange tubes in the existing fluidized furnace are single, which is not convenient for stable control of the material quality. Utility Model Content

[0004] The utility model aims to provide a fluidized calcining furnace for by-product gypsum, which can avoid the situation that it is inconvenient to quickly discharge materials when a failure occurs during the operation of the equipment. Secondly, the heat exchange tubes in the existing fluidized furnace are single, which is not convenient for stable control of material quality.

[0005] The utility model provides a fluidized calcining furnace for by-product gypsum, comprising a shell, wherein both sides of the upper end of the shell are respectively provided with a feed port and a discharge port, a partition plate and a vertical steam condensation heat exchange pipe are arranged in the shell, the partition plate partitions the shell into two chambers along the feed port and the discharge port, raw materials enter from the feed port and flow along the lower part of the partition plate into the right chamber, and the calcined materials are discharged through the discharge port in the upper middle part of the right chamber.

[0006] In a specific implementation manner, a Roots blower interface is provided at the lower side of the shell, and the Roots blower delivers high-pressure air to an isobaric air chamber arranged at the bottom of the shell through the Roots blower interface.

[0007] In a specific embodiment, an air distribution plate is provided on the upper portion of the isobaric air chamber.

[0008] In a specific embodiment, a hood is installed on the upper side of the air distribution plate, and the air in the isobaric air chamber enters the shell through the small holes on the hood to mix with the raw materials.

[0009] In a specific embodiment, the vertical steam condensation heat exchange pipes are arranged with two independent heat exchange pipe networks on the left and right sides of the partition plate.

[0010] In a specific embodiment, a plurality of slag discharge pipes are provided on the lower side of the air distribution plate, and the discharge ends of the plurality of slag discharge pipes are all connected to the slag discharge port opened at the bottom of the shell.

[0011] In a specific embodiment, a steam collector is installed at the upper end of the shell, a steam interface is provided on the steam collector, and an air exhaust valve is provided on the steam interface.

[0012] In a specific implementation, a condensate collector is disposed inside the shell, a condensate drain interface is disposed on the condensate collector, and an air exhaust valve is provided on the condensate drain interface.

[0013] In a specific implementation, a fixed sleeve is provided at the bottom of the shell, a pair of rotating rods are rotatably provided in the fixed sleeve, a knocking wheel is connected to the rotating rods, and the two rotating rods both penetrate the shell and are respectively connected to meshing gears.

[0014] In a specific embodiment, the two knocking wheels are respectively located between the slag discharge pipe and the slag discharge port.

[0015] The fluidized calcining furnace for by-product gypsum provided in the embodiment of the utility model has the following advantages compared with the prior art:

[0016] 1. The utility model designs multiple slag discharge and discharge ports on the air distribution plate to ensure fault handling during equipment operation and rapid discharge during shutdown. The knocking wheel is driven by the rotating rod to knock on the slag discharge pipe, which accelerates the discharge. Secondly, the partition plate is set to extend the running track of the material to prevent fine particles from being directly short-circuited and discharged from the discharge port, thereby avoiding the situation where the quality cannot be controlled. The device uses steam as the heat source and sets up multiple independent heat exchange pipe networks. By adjusting the different pressures and temperatures of steam in different pipe networks, the quality of different moisture contents and different raw material feed amounts can be accurately controlled. In addition, each group of heat exchange pipe networks is provided with an independent exhaust air valve to ensure the heat exchange efficiency of steam condensation heat exchange, improve equipment utilization, and reduce product energy consumption.

[0017] 2. The utility model arranges the vertical steam condensation heat exchange tube vertically to effectively prevent gypsum from sticking to the tube after meeting water. The steam collector and the vertical steam condensation heat exchange tube adopt the bottom elbow form to prevent water accumulation in the steam collector, thus avoiding vibration and water hammer during the operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the internal plane of the housing structure of an embodiment of the utility model;

[0021] Figure 3 This is a schematic diagram of the internal side view of the housing of an embodiment of the utility model;

[0022] Figure 4 This is a schematic diagram of the bottom structure of the housing according to an embodiment of the utility model;

[0023] Figure 5 The figure is a schematic diagram of the structure of the knocking wheel according to an embodiment of the utility model.

[0024] icon:

[0025] 1. Feed inlet; 2. Steam collector; 3. Steam interface; 4. Exhaust valve; 5. Condensate collector; 6. Condensate drainage interface; 7. Shell; 8. Wind hood; 9. Air distribution plate; 10. Isobaric air chamber; 11. Slag discharge pipe; 12. Slag discharge port; 13. Roots blower interface; 14. Partition plate; 15. Vertical steam condensation heat exchange tube; 16. Discharge port; 17. Fixed sleeve; 18. Rotating rod; 19. Knocking wheel; 20. Gear. DETAILED DESCRIPTION

[0026] In order to solve the conversion of industrial by-product gypsum raw materials into building gypsum powder, it is necessary to calcine the industrial by-product gypsum raw materials in a fluidized calcining furnace. The fluidized calcining furnace fluidizes the bed by blowing an appropriate amount of air from the bottom of the main body. The existing fluidized furnace usually has a slag discharge and discharge port. Therefore, when a failure occurs during the operation of the equipment, it is not convenient to discharge the material quickly. Secondly, the heat exchange tubes in the existing fluidized furnace are single, which is not convenient for stable control of the material quality. Therefore, after research, a fluidized calcining furnace for by-product gypsum is provided. When in use, multiple slag discharge and discharge ports are designed on the air distribution plate to ensure fault handling during equipment operation and rapid discharge during shutdown. The knocking wheel is driven by the rotating rod to knock on the slag discharge pipe, which accelerates the discharge. Secondly, the partition plate is set to extend the running trajectory of the material to prevent fine particle materials from short-circuiting and being discharged from the discharge port directly, thereby avoiding the situation where the quality cannot be controlled. The device uses steam as the heat source and is equipped with multiple independent heat exchange pipelines. By adjusting the different pressures and temperatures of steam in different pipelines, the quality of different moisture contents and different raw material feed amounts can be accurately controlled, thereby solving the above-mentioned defects.

[0027] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] Please refer to Figure 1-Figure 5 The embodiment of the utility model provides a fluidized calcining furnace for by-product gypsum, including a shell 7, wherein a feed port 1 and a discharge port 16 are respectively provided on both sides of the upper end of the shell 7, and a partition plate 14 and a vertical steam condensation heat exchange pipe 15 are provided in the shell 7. The partition plate 14 divides the shell 7 into two chambers along the direction of the feed port 1 and the discharge port 16. The by-product gypsum raw material with an attached water content of less than 5% enters from the feed port 1 provided at the upper part of the left chamber, and flows into the right chamber along the lower part of the partition plate 14. The calcined material is discharged from the discharge port 16 in the middle and upper part of the right chamber.

[0029] In order to achieve fluidization, a Roots blower interface 13 is opened on the lower side of the shell 7, and the Roots blower conveys high-pressure air to the isobaric air chamber 10 arranged at the bottom of the shell 7 through the Roots blower interface 13. Since an air distribution plate 9 is arranged on the upper part of the isobaric air chamber 10, and a wind cap 8 is installed on the upper side of the air distribution plate 9, the air in the isobaric air chamber 10 enters the shell 7 through the small holes on the wind cap 8 and mixes with the by-product gypsum raw materials, and completes the fluidization of the by-product gypsum solid particle powder material, so that the solid gypsum powder material has the properties of a fluid.

[0030] In addition, a steam collector 2 is installed at the upper end of the shell 7, and a steam interface 3 is provided on the steam collector 2. An air exhaust valve 4 is opened on the steam interface 3. During the calcination process, gypsum will release a large amount of water vapor after high-temperature treatment. If these steams are not collected and processed in time, they may have an adverse effect on the temperature and pressure in the furnace, thereby affecting the calcination effect and product quality. The steam collector 2 gathers these steams through an effective collection mechanism to prevent them from interfering with the environment in the furnace.

[0031] A condensate collector 5 is arranged inside the shell 7, and a condensate drainage interface 6 is arranged on the condensate collector 5. An air exhaust valve 4 is opened on the condensate drainage interface 6. In the gypsum calcining fluidized furnace, the steam will be converted into condensate after cooling. If the condensate is not discharged in time, it may accumulate in the furnace, affecting the heat transfer and airflow distribution in the furnace, and further affecting the calcination efficiency. The function of the condensate collector 5 is to effectively collect and discharge the condensate to ensure the stability of the furnace environment and smooth operation.

[0032] Two sets of independent heat exchange pipe networks are arranged on the left and right sides of the partition plate 14 for the vertical steam condensation heat exchange pipe 15. The fluidized material is fully in contact and rubbed with the heat exchange pipe network, so that the by-product gypsum raw material absorbs the heat released by the condensed steam in the pipe. The by-product gypsum raw material that absorbs the heat is dehydrated, and the internal phase structure changes from the original dihydrate gypsum raw material to semi-hydrated building gypsum powder.

[0033] Among them, the two independent sets of heat exchange pipe networks solve the different heat requirements of gypsum raw materials at different stages when entering the gypsum calcining furnace. By adjusting the different pressures and temperatures in the heat exchange pipe network during the gypsum calcining process, the complete conversion of dihydrate gypsum to hemihydrate gypsum is achieved, and precise control of the production process is realized. The water vapor calcined from the raw materials is mixed with the air delivered by the Roots blower and then sucked into the dust collector installed on the top of the gypsum calcining furnace, and the dust is filtered out and then discharged to the outside.

[0034] A plurality of slag discharge pipes 11 are arranged on the lower side of the air distribution plate 9, and the discharge ends of the plurality of slag discharge pipes 11 are connected to the slag discharge port 12 opened at the bottom of the shell 7. For a small amount of large-particle materials and high-density sand, iron filings and other impurities that enter the shell 7 together with the gypsum raw materials, these impurities cannot be completely fluidized by the Roots blower due to their large mass, and the impurities are deposited on the upper part of the air distribution plate 9. A fixed bed layer will be formed over a long period of time, and the bed resistance will be increased so that the upper material cannot be completely fluidized. In order to avoid this situation, the impurities need to be discharged through the slag discharge pipes 11 and the slag discharge port 12 arranged on the air distribution plate 9. Secondly, when the device is shut down, the impurities can also be discharged from the shell 7 through the slag discharge pipes 11 and the slag discharge port 12, which cannot be discharged from the discharge port 16, to ensure that there is no material accumulation in the fluidized calcining furnace.

[0035] Furthermore, a fixed sleeve 17 is provided at the bottom of the shell 7, and a pair of rotating rods 18 are rotatably provided in the fixed sleeve 17, and a knocking wheel 19 is connected to the rotating rod 18. The two rotating rods 18 both penetrate the shell 7 and are respectively connected to the meshing gears 20, wherein the knocking wheels 19 are respectively located between the slag discharge pipe 11 and the slag discharge port 12, wherein one of the gears 20 is driven by a motor, and when the two gears 20 rotate and mesh, the two rotating rods 18 are prompted to rotate with the two knocking wheels 19, and the knocking wheels 19 knock the slag discharge pipe 11, thereby accelerating the discharge of the slag discharge pipe 11 and avoiding impurities from being retained in the slag discharge pipe 11.

[0036] In summary, a fluidized calcining furnace for by-product gypsum in an embodiment of the utility model has the following working principle: first, a by-product gypsum raw material with an attached water content of less than 5% is allowed to enter the shell 7 through the feed port 1, and air is sent into the isobaric wind chamber 10 by a Roots blower. The air enters the shell 7 through a number of hoods 8 arranged on the air distribution plate 9, so that the by-product gypsum raw material in the furnace and the by-product gypsum raw material entering the furnace are mixed, and the air fluidizes the gypsum raw material, and the fluidized by-product gypsum raw material contacts and rubs against the heat exchange pipe network arranged in the calcining furnace, and saturated or superheated steam of about 1.0 MPa is introduced into the heat exchange pipe network, and the heat released after the steam in the pipe undergoes condensation phase change is absorbed by the by-product gypsum raw material in contact with it, and the internal structure of the by-product gypsum raw material undergoes a change after absorbing heat, and the calcination is completed. The calcined by-product gypsum is discharged through the discharge port 16, and the calcined by-product gypsum raw material is building gypsum powder, and the heated air and the water vapor calcinated from the gypsum raw material are extracted from the top of the shell 7 by the dust collector.

[0037] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fluidized calcining furnace for by-product gypsum, comprising a shell (7), wherein a feed inlet (1) and a discharge outlet (16) are respectively provided on both sides of the upper end of the shell (7), characterized in that: A partition plate (14) and a vertical steam condensation heat exchange tube (15) are arranged in the shell (7). The partition plate (14) divides the shell (7) into two chambers along the direction of the feed port (1) and the discharge port (16). The raw material enters from the feed port (1) and flows along the lower part of the partition plate (14) into the right chamber. After calcination, the material is discharged through the discharge port (16) in the upper middle part of the right chamber.

2. The by-product gypsum fluidized calcining furnace according to claim 1, characterized in that: A Roots blower interface (13) is provided on the lower side of the housing (7), and the Roots blower delivers high-pressure air to an isobaric air chamber (10) provided at the bottom of the housing (7) through the Roots blower interface (13).

3. The by-product gypsum fluidized calcining furnace according to claim 2, characterized in that: An air distribution plate (9) is provided on the upper portion of the isobaric air chamber (10).

4. The fluidized calcining furnace for by-product gypsum according to claim 3, characterized in that: A wind cap (8) is installed on the upper side of the air distribution plate (9), and the air in the isobaric air chamber (10) enters the shell (7) through the small holes on the wind cap (8) to mix with the raw materials.

5. The fluidized calcining furnace for by-product gypsum according to claim 4, characterized in that: The vertical steam condensation heat exchange pipes (15) are arranged with two independent heat exchange pipe networks on the left and right sides of the partition plate (14).

6. The fluidized calcining furnace for by-product gypsum according to claim 5, characterized in that: A plurality of slag discharge pipes (11) are arranged on the lower side of the air distribution plate (9), and the discharge ends of the plurality of slag discharge pipes (11) are all connected to a slag discharge port (12) provided at the bottom of the shell (7).

7. The fluidized calcining furnace for by-product gypsum according to claim 6, characterized in that: A steam collector (2) is installed at the upper end of the shell (7), a steam interface (3) is provided on the steam collector (2), and an air exhaust valve (4) is provided on the steam interface (3).

8. The fluidized calcining furnace for by-product gypsum according to claim 7, characterized in that: A condensate collector (5) is arranged inside the shell (7), a condensate drainage interface (6) is arranged on the condensate collector (5), and an air exhaust valve (4) is provided on the condensate drainage interface (6).

9. The fluidized calcining furnace for by-product gypsum according to claim 1, characterized in that: A fixing sleeve (17) is arranged at the bottom of the housing (7), a pair of rotating rods (18) are rotatably arranged in the fixing sleeve (17), a knocking wheel (19) is connected to the rotating rods (18), and the two rotating rods (18) both penetrate the housing (7) and are respectively connected to meshing gears (20).

10. The fluidized calcining furnace for by-product gypsum according to claim 9, characterized in that: The two knocking wheels (19) are respectively located between the slag discharge pipe (11) and the slag discharge port (12).

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