A desulfurized gypsum circulating calcination system

Abstract

This application discloses a desulfurized gypsum circulating calcination system, including a stirring and circulating device with a stirring inlet and a stirring outlet, a fluidized bed furnace connected to the stirring outlet, an air distribution plate set at the bottom of the fluidized bed furnace, a blower facing the air distribution plate and used to blow the material inside the fluidized bed furnace, and a material collection mechanism connected to the outlet of the fluidized bed furnace. The fluidized bed furnace is provided with a first circulation port, which is connected to the stirring inlet of the stirring and circulating device. By setting a material circulation path between the fluidized bed furnace and the stirring and circulating device, the reflux and reprocessing of insufficiently calcined material can be realized, which effectively improves the fluidization state of the material, calcination efficiency and finished product quality, and enhances the stability of system operation.

Description

Technical Field

[0001] This application relates to the field of fluidized bed furnace technology, and more particularly to a desulfurized gypsum circulating calcination system. Background Technology

[0002] my country is the world's largest coal producer, and sulfur dioxide emissions from coal combustion are causing increasingly prominent air pollution problems. With stricter environmental regulations, desulfurization of coal-fired flue gas has become a crucial project, but it also generates a large amount of desulfurization byproducts, including desulfurized gypsum powder. Currently, the most common calcination method is fluidized bed calcination, which mainly consists of a fluidized bed furnace, air distribution plate, and Roots blower. The Roots blower forces airflow into the air distribution plate to fluidize the raw material, and steam is introduced to heat and remove crystal water. However, because the heating pipes inside the furnace occupy space, it is impossible to install a stirring device. Existing technologies generally add a stirring unit below the air distribution plate to break up clumps of raw material, but this affects the upward airflow from the Roots blower, impacting the overall fluidization state and reducing calcination efficiency. Furthermore, incomplete calcination of the raw material in the fluidized bed furnace leads to its discharge, making it difficult to guarantee the quality of the finished product. Utility Model Content

[0003] The purpose of this application is to overcome the above-mentioned problems and provide a desulfurized gypsum circulating calcination system.

[0004] The technical solution of this application provides a desulfurized gypsum circulating calcination system, including a stirring and circulating device with a stirring inlet and a stirring outlet, a fluidized bed furnace connected to the stirring outlet, an air distribution plate disposed at the bottom of the fluidized bed furnace, a blower arranged toward the air distribution plate and used to blow the material inside the fluidized bed furnace, and a material collection mechanism connected to the outlet of the fluidized bed furnace.

[0005] The fluidized bed furnace is provided with a first circulation port, which is connected to the stirring inlet of the stirring circulation device.

[0006] Furthermore, it includes a dust recycling device;

[0007] The dust inlet of the dust circulation device is connected to the second circulation port located on the upper part of the fluidized bed furnace, and the dust outlet of the dust circulation device is connected to the stirring inlet of the stirring circulation device.

[0008] Furthermore, the stirring and circulating device is provided with a dust circulation port;

[0009] The dust circulation port is located above the mixing outlet, and the second circulation port is connected to the dust circulation port.

[0010] Furthermore, the second circulation port is connected to the dust inlet of the dust circulation device through the first pipe;

[0011] The first pipe is connected to a second pipe in the middle. The second pipe is equipped with a first screen at the connection point with the first pipe. The second pipe is connected to the dust circulation port.

[0012] Furthermore, the material collection mechanism includes a ring mill, a residual material collection bin with a residual material inlet and a residual material outlet, a conveying fan, and a storage bin;

[0013] One end of the ring mill is connected to the discharge port of the fluidized bed furnace, and the other end of the ring mill is connected to the feed port of the waste material.

[0014] The residual material outlet is connected to the storage silo via a conveying pipe, and the conveying fan is connected to the middle of the conveying pipe to blow the material into the storage silo.

[0015] Furthermore, the waste material collection bin is also equipped with an air inlet, an air outlet, and a fine material inlet;

[0016] The air inlet is connected to the fan, and the air outlet is connected to the air distribution plate;

[0017] The fine material inlet of the residual material collection bin is connected to the front of the first pipe through a third pipe, and the third pipe is provided with a second screen at the connection with the first pipe for screening out fine dust.

[0018] Furthermore, it includes a valve mechanism and a control mechanism electrically connected to the valve mechanism;

[0019] The valve mechanism includes a first valve, a second valve, and a third valve;

[0020] The first valve is located at the discharge port of the fluidized bed furnace, the second valve is located at the first circulation port, and the third valve is located at the second circulation port.

[0021] Furthermore, the stirring and circulating device is equipped with spiral stirring blades for dispersing materials.

[0022] Furthermore, it includes a steam device having a heat-conducting pipe through which steam is passed;

[0023] The heat-conducting pipe runs through the stirring and circulating device. One end of the heat-conducting pipe is connected to the steam outlet of the steam device, and the other end of the heat-conducting pipe is connected to the steam return outlet of the steam device.

[0024] Furthermore, the device includes a bucket elevator and a mill, wherein the feed inlet of the bucket elevator is connected to the mixing outlet of the mixing and circulating device, the discharge outlet of the bucket elevator is connected to the feed inlet of the mill, and the discharge outlet of the mill is connected to the feed inlet of the fluidized bed furnace.

[0025] The above technical solution has the following beneficial effects:

[0026] The desulfurized gypsum circulating calcination system of this application includes a stirring and circulating device with a stirring inlet and a stirring outlet, a fluidized bed furnace connected to the stirring outlet, an air distribution plate set at the bottom of the fluidized bed furnace, a blower facing the air distribution plate and used to blow the material inside the fluidized bed furnace, and a material collection mechanism connected to the outlet of the fluidized bed furnace. The fluidized bed furnace is provided with a first circulation port, which is connected to the stirring inlet of the stirring and circulating device. By setting a material circulation path between the fluidized bed furnace and the stirring and circulating device, the return and reprocessing of insufficiently calcined material can be realized, which effectively improves the fluidization state of the material, calcination efficiency and finished product quality, and enhances the stability of system operation. Attached Figure Description

[0027] The disclosure of this application will become more readily understood with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. In the drawings:

[0028] Figure 1 This is a schematic diagram of the desulfurized gypsum circulating calcination system in one embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the stirring and circulating device in one embodiment of this application.

[0030] Appendix Label Reference Table:

[0031] Mixing and circulating device 01: mixing inlet 11, mixing outlet 12, dust circulation inlet 13, spiral mixing blades 14;

[0032] Fluidized bed furnace 02: First circulation port 21, second circulation port 22

[0033] Air distribution panel 03:

[0034] Fan 04:

[0035] Material collection mechanism 05: ring mill 51, residual material collection bin 52, residual material inlet 521, residual material outlet 522, air inlet 523, air outlet 524, fine material inlet 525, conveying fan 53, storage bin 54;

[0036] Dust circulation device 06: Dust inlet 61, dust outlet 62, dust pressure relief port 63.

[0037] First Pipeline 07;

[0038] Second pipe 08: First screen 81;

[0039] Pipeline 09:

[0040] Third pipe 010: Second screen 101;

[0041] Valve mechanism 011: First valve 111, second valve 112, third valve 113;

[0042] Steam device 012: heat pipe 121, steam outlet 122, steam return port 123;

[0043] Bucket elevator 013, mill 014. Detailed Implementation

[0044] The specific embodiments of this application will be further described below with reference to the accompanying drawings.

[0045] It is readily understood that, based on the technical solution of this application, various structural and implementation methods can be interchanged by those skilled in the art without altering the essential spirit of this application. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this application and should not be considered as the entirety of this application or as limitations or restrictions on the technical solution of the application.

[0046] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meanings of the above in this application according to the specific circumstances.

[0048] like Figure 1 As shown, a desulfurized gypsum circulating calcination system according to one embodiment of this application includes a stirring and circulating device 01 having a stirring inlet 11 and a stirring outlet 12, a fluidized bed furnace 02 connected to the stirring outlet 12, an air distribution plate 03 disposed at the bottom of the fluidized bed furnace 02, a blower 04 arranged toward the air distribution plate 03 and used to blow the material inside the fluidized bed furnace 02, and a material collection mechanism 05 connected to the outlet of the fluidized bed furnace 02.

[0049] The fluidized bed furnace 02 is provided with a first circulation port 21, which is connected to the stirring feed port 11 of the stirring circulation device 01.

[0050] In this embodiment, the desulfurized gypsum circulating calcination system includes a stirring and circulating device 01, a fluidized bed furnace 02, an air distribution plate 03, a blower 04, and a material collection mechanism 05. The stirring and circulating device 01 has a stirring inlet 11 and a stirring outlet 12, which are used to receive the raw materials to be processed and to stir and heat them, thereby effectively breaking up the agglomeration of the raw materials and improving the flowability of the materials. The fluidized bed furnace 02 is connected to the stirring outlet 12 of the stirring and circulating device 01 and is used to send the stirred raw materials into the fluidized bed furnace 02 for subsequent calcination.

[0051] The air distribution plate 03 is set at the bottom of the fluidized bed furnace 02. The air distribution plate 03 evenly distributes the airflow to achieve the fluidization of the raw materials in the furnace. The blower 04 is arranged facing the air distribution plate 03 and can be a Roots blower 04. It is used to blow airflow into the air distribution plate 03 to blow the materials inside the fluidized bed furnace 02. The material collection mechanism 05 is connected to the discharge port of the fluidized bed furnace 02 and is used to collect the desulfurized gypsum powder after calcination for subsequent storage or transportation.

[0052] Furthermore, the fluidized bed furnace 02 is also equipped with a first circulation port 21, which is connected to the stirring feed port 11 of the stirring circulation device 01. When some raw materials are not fully calcined in the fluidized bed furnace 02 due to excessively large particles or uneven heating, they will flow back to the stirring feed port 11 through the first circulation port 21, be stirred again inside the stirring circulation device 01, and then be sent back to the fluidized bed furnace 02 for calcination. This realizes the recovery and reprocessing of the insufficiently calcined materials, avoids raw material waste, and improves the quality of the finished product.

[0053] like Figure 1 As shown, in one embodiment, a dust recycling device 06 is included;

[0054] The dust inlet 61 of the dust circulation device 06 is connected to the second circulation port 22 located on the upper part of the fluidized bed furnace 02, and the dust outlet 62 of the dust circulation device 06 is connected to the stirring inlet 11 of the stirring circulation device 01.

[0055] In this embodiment, the dust recycling device 06 includes a dust inlet 61 and a dust outlet 62. A second circulation port 22 is provided on the upper part of the fluidized bed furnace 02. The dust inlet 61 is connected to the second circulation port 22, and the dust outlet 62 is connected to the stirring inlet 11 of the stirring circulation device 01. The dust inlet 61 is used to collect the dust that floats to the surface inside the fluidized bed furnace 02 and does not settle. After being processed by the dust recycling device 06, the dust is discharged from its dust outlet 62 and sent to the stirring inlet 11 of the stirring circulation device 01. After being stirred together with the raw materials, the dust re-enters the fluidized bed furnace 02 for calcination. By recycling the fine dust floating on the surface through the dust recycling device 06 and re-participating in stirring and calcination, dust emission pollution is avoided, the utilization rate of raw materials is improved, and resource waste is reduced.

[0056] The stirring and circulating device 01 fully disperses and mixes materials from different sources, which helps to improve fluidization quality and heating uniformity, making the final desulfurized gypsum product more stable in quality.

[0057] like Figure 1 As shown, in one embodiment, the stirring and circulating device 01 is provided with a dust circulation port 13;

[0058] The dust circulation port 13 is located above the mixing outlet 12, and the second circulation port 22 is connected to the dust circulation port 13.

[0059] In this embodiment, the stirring and circulating device 01 is also provided with a dust circulation port 13, which is located above the stirring outlet 12. The second circulation port 22 of the fluidized bed furnace 02 is connected to the dust circulation port 13, forming a dust return path from the top of the fluidized bed furnace 02 to the stirring and circulating device 01.

[0060] Specifically, there is some dust at the top of the fluidized bed furnace 02. Due to factors such as airflow disturbance and uneven particle size distribution, some dust will flow through the second circulation port 22 to the dust circulation port 13. Most of this dust is composed of particles with sufficiently small diameters, which only need to re-enter the fluidized bed furnace 02 for fluidization. At this time, the dust circulation port 13 is located above the stirring discharge port 12, which is conducive to the dust falling and entering the fluidized bed furnace 02 together with the main material for recalcination. This avoids the direct discharge of dust, which would cause waste of raw materials and improve the overall material utilization rate of the system. The dust flows back directly in the closed pipeline without the need for manual intervention by technicians, which effectively reduces the risk of dust spillage and improves the environmental safety performance of the equipment.

[0061] like Figure 1 As shown, in one preferred embodiment, the second circulation port 22 is connected to the dust inlet 61 of the dust circulation device 06 via the first pipe 07;

[0062] The middle part of the first pipe 07 is connected to the second pipe 08. The second pipe 08 is provided with a first screen 81 at the connection with the first pipe 07. The second pipe 08 is connected to the dust circulation port 13.

[0063] In this preferred embodiment, the second circulation port 22 is directly connected to the dust inlet 61 through the first pipe 07, forming the main passage for dust return, which is used to transport the dust floating in the fluidized bed furnace 02 to the dust circulation device 06.

[0064] The middle part of the first pipe 07 is connected to the second pipe 08, and the second pipe 08 is provided with a first screen 81 at the connection with the first pipe 07. The first screen 81 is used to screen the dust material entering the first pipe 07 through the second circulation port 22, and screen out the finer particles and let them enter the second pipe 08. The second pipe 08 is connected to the dust material circulation port 13 to form a fine dust return channel, so that the fine dust particles can directly re-enter the fluidized bed furnace 02 through the stirring outlet 12 for mixing and stirring without going through the dust material circulation device 06.

[0065] Large dust particles or agglomerates that are not intercepted by the first screen 81 continue to move along the first pipe 07, enter the dust circulation device 06 through the dust inlet 61, and are then discharged from the dust outlet 62 and enter the mixing and circulation device 01 to participate in the process of dispersing and heating again.

[0066] like Figure 1 As shown, in one embodiment, the dust circulation device 06 is provided with a dust pressure relief port 63, which is connected to a pressure relief valve 64.

[0067] In this embodiment, the dust pressure relief port 63 is used to release excess pressure when the internal air pressure rises abnormally, effectively preventing damage to pipes and equipment caused by air pressure impact, and can react quickly to avoid problems such as dust backflow, and is used to maintain the safe operation of the dust circulation device 06.

[0068] like Figure 1 As shown, in another embodiment, the material collection mechanism 05 includes a ring mill 51, a residual material collection bin 52 having a residual material inlet 521 and a residual material outlet 522, a conveying fan 53, and a storage bin 54.

[0069] One end of the ring mill 51 is connected to the discharge port of the fluidized bed furnace 02, and the other end of the ring mill 51 is connected to the residual material inlet 521.

[0070] The residual material outlet 522 is connected to the storage bin 54 via the conveying pipe 09, and the conveying fan 53 is connected to the middle of the conveying pipe 09 to blow the material toward the storage bin 54.

[0071] In this embodiment, the material collection mechanism 05 includes a ring mill 51, a residual material collection bin 52 with a residual material inlet 521 and a residual material outlet 522, a conveying fan 53, and a storage bin 54. The ring mill 51 is located at the rear end of the discharge port of the fluidized bed furnace 02 and is connected to the discharge port of the fluidized bed furnace 02. It is used to further grind the calcined material to obtain gypsum powder with finer particle size and higher uniformity. The ground material enters the residual material inlet 521 from the other end of the ring mill 51 to temporarily store the ground material and avoid the accumulation problem caused by the material directly entering the storage bin 54. The residual material outlet 522 is connected to the storage bin 54 through a conveying pipe 09. The conveying fan 53 is connected to the middle of the conveying pipe 09 to provide airflow power to blow the material to the storage bin 54. The storage bin 54 is used to collect and store the finished desulfurized gypsum powder for subsequent packaging or transportation.

[0072] The fully enclosed conveyor structure prevents dust leakage, which helps improve the working environment, reduce dust pollution, enhance the environmental friendliness of the system, and realize automatic control, thereby improving production efficiency, automation level and system safety.

[0073] like Figure 1 As shown, in another embodiment, the waste material collection bin 52 is also provided with an air inlet 523, an air outlet 524 and a fine material inlet 525;

[0074] The air inlet 523 is connected to the fan 04, and the air outlet 524 is connected to the air distribution plate 03;

[0075] The fine material inlet 525 of the residual material collection bin 52 is connected to the front of the first pipe 07 through the third pipe 010. The third pipe 010 is provided with a second screen 101 for screening out fine dust at the connection with the first pipe 07.

[0076] In this embodiment, the waste material collection bin 52 is also provided with an air inlet 523, an air outlet 524, and a fine material inlet 525. The air inlet 523 is connected to the blower 04, and the air outlet 524 is connected to the air distribution plate 03. The high-pressure airflow provided by the blower 04 first enters the interior of the waste material collection bin 52 through the air inlet 523, forming a stable air pressure environment inside the waste material collection bin 52. The airflow is then guided to flow into the area below the air distribution plate 03 through the air outlet 524, thereby forming a closed airflow circulation path. By using the waste material collection bin 52 as an intermediate air chamber, the airflow fluctuations of the blower 04 are effectively buffered, ensuring that the airflow supplied to the air distribution plate 03 is more stable and uniform, which is beneficial to keeping the material inside the fluidized bed furnace 02 in a continuous fluidized state.

[0077] The waste material collection bin 52 is also provided with a fine material inlet 525. The fine material inlet 525 is connected to the front of the first pipe 07 through the third pipe 010. The third pipe 010 is provided with a second screen 101 at the connection with the first pipe 07. The second screen 101 is used to screen out the fine dust with smaller particle size from the first pipe 07. The dust that is screened out has a particle size similar to or the same as the finished material after grinding by the ring mill 51. Therefore, the dust that is screened out can enter the fine material inlet 525 of the waste material collection bin 52 through the third pipe 010 and be temporarily stored and settled inside the waste material collection bin 52 without further grinding.

[0078] In one preferred embodiment, the waste material collection bin 52 includes an air guide zone and a settling zone. An air inlet 523 is located at one end of the air guide zone to receive the high-pressure airflow sent by the fan 04. An air outlet 524 is located at the other end of the air guide zone and is connected to the air distribution plate 03. A partition is provided between the air guide zone and the settling zone. The fine material inlet 525, the waste material inlet 521, and the waste material outlet 522 are respectively connected to the settling zone to receive and temporarily store materials.

[0079] In this preferred embodiment, by setting a partition inside the waste material collection bin 52 to form an air guiding zone and a settling zone, the high-pressure airflow delivered by the blower 04 can only flow within the air guiding zone, avoiding the dispersion of materials in the settling zone and ensuring smooth material deposition. The waste material collection bin also serves as a material temporary storage device and a pressure stabilization channel, improving the integration of the equipment structure, saving space, and simplifying the overall layout.

[0080] like Figure 1 As shown, in another embodiment, it includes a valve mechanism 011 and a control mechanism electrically connected to the valve mechanism 011;

[0081] The valve mechanism 011 includes a first valve 111, a second valve 112, and a third valve 113;

[0082] The first valve 111 is located at the discharge port of the fluidized bed furnace 02, the second valve 112 is located at the first circulation port 21, and the third valve 113 is located at the second circulation port 22.

[0083] In this embodiment, a valve mechanism 011 and a control mechanism are included. The valve mechanism 011 is electrically connected to the control mechanism. The valve mechanism 011 includes a first valve 111, a second valve 112, and a third valve 113. The first valve 111 is located at the discharge port of the fluidized bed furnace 02 and is used to control the discharge of material to the material collection mechanism 05. The second valve 112 is located at the first circulation port 21 and is used to control the return of insufficiently calcined material to the stirring and circulation device 01 for re-stirring, heating, and calcination. The third valve 113 is located at the second circulation port 22 and is used to control the flow of dust to the dust circulation device 06.

[0084] The control mechanism can be a PLC controller, an embedded control system, or an automated control unit, etc., which can automatically or manually adjust the opening and closing status of each valve according to the calcination conditions and parameters to achieve intelligent operation of the system.

[0085] Independently controllable valves are installed at the discharge port, first circulation port 21 and second circulation port 22 of the fluidized bed furnace 02. Based on the calcination effect, the system can precisely adjust whether the material should first enter the material collection mechanism 05, be refluxed for recalcination, or enter the dust circulation device 06, which effectively improves the operational flexibility of the system.

[0086] Specifically, intelligent diversion processing of materials in different calcination states can be achieved by controlling the opening and closing logic of the first valve 111, the second valve 112, and the third valve 113. When the material is fully calcined, the control mechanism can control the first valve 111 to open and the second valve 112 and the third valve 113 to close, so that the qualified calcined material is directly discharged to the material collection mechanism 05. When the material is not fully calcined, the control mechanism can control the second valve 112 to open and the first valve 111 to close, so that the material returns to the stirring circulation device 01 through the first circulation port 21 for recalcination. When the light dust or fine material generated at the top of the fluidized bed furnace 02 needs to be recycled and reused, the control mechanism can control the third valve 113 to open, so that the dust enters the dust circulation device 06 through the second circulation port 22 for further screening and return to the system, thereby improving resource utilization efficiency.

[0087] The three-valve linkage control can select the appropriate flow and circulation path according to the real-time material status, ensuring the stability of finished product quality, improving the intelligence and automation level of system operation, enhancing the system's recycling efficiency, reducing raw material waste, and improving the system's material handling capacity and economic benefits.

[0088] like Figure 2 As shown, in one embodiment, the stirring and circulating device 01 is provided with spiral stirring blades 14 for dispersing materials.

[0089] In this embodiment, the stirring and circulating device 01 is equipped with a spiral stirring blade 14 for fully stirring and dispersing the material entering the device. The spiral stirring blade 14 is arranged along the internal axis of the stirring and circulating device 01. By rotating, it breaks up and homogenizes the agglomerated and sticky materials in the raw materials. This allows the newly entered or returned materials to be fully loosened and homogenized before entering the fluidized bed furnace 02 for calcination, thereby improving the fluidization effect and calcination uniformity of the materials when they subsequently enter the fluidized bed furnace 02.

[0090] like Figure 1 and Figure 2 As shown, in one preferred embodiment, a steam device 012 is included, the steam device 012 having a heat-conducting pipe 121 through which steam is passed;

[0091] The heat-conducting pipe 121 passes through the stirring and circulating device 01. One end of the heat-conducting pipe 121 is connected to the steam output port 122 of the steam device 012, and the other end of the heat-conducting pipe 121 is connected to the steam return port 123 of the steam device 012.

[0092] In this preferred embodiment, a steam device 012 is included, which is provided with a heat-conducting pipe 121 through which steam is passed. The heat-conducting pipe 121 passes through the stirring and circulating device 01, with one end connected to the steam output port 122 of the steam device 012 and the other end connected to the steam return port 123 of the steam device 012, thereby realizing a closed-loop steam circulation.

[0093] Specifically, the heat pipe 121 penetrates the cylinder of the circulating stirring device and is arranged along its axial direction. During the stirring process, it heats the material uniformly to remove the water of crystallization in advance. It works in synergy with the stirring process to improve the heat transfer efficiency, increase the material temperature before entering the fluidized bed furnace 02, reduce the load on the fluidized bed furnace 02, and improve the calcination efficiency.

[0094] In one embodiment, the steam flow direction inside the heat pipe 121 is opposite to the material transport direction of the stirring and circulating device 01.

[0095] In this embodiment, the steam flow direction inside the heat pipe 121 is opposite to the material transport direction of the stirring and circulating device 01, thereby achieving countercurrent heat exchange and improving heat transfer efficiency.

[0096] In one embodiment, the device includes a bucket elevator 013 and a mill 014. The feed inlet of the bucket elevator 013 is connected to the mixing outlet 12 of the mixing and circulating device 01, the outlet of the bucket elevator 013 is connected to the feed inlet of the mill 014, and the outlet of the mill 014 is connected to the feed inlet of the fluidized bed furnace 02.

[0097] In this embodiment, a bucket elevator 013 and a mill 014 are also included. The feed inlet of the bucket elevator 013 is connected to the mixing outlet 12, the outlet of the bucket elevator 013 is connected to the feed inlet of the mill 014, and the outlet of the mill 014 is connected to the feed inlet of the fluidized bed furnace 02. This is used to vertically transport the mixed material to a high position and to refine it inside the mill 014, making the material particle size finer. This helps to fluidize more quickly in the fluidized bed furnace 02, fully heat and dehydrate, and improve the calcination efficiency and reaction rate.

[0098] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0099] The above description is merely the principle and preferred embodiment of this application. It should be noted that for those skilled in the art, implementation methods obtained by appropriately combining the technical solutions disclosed in different embodiments are also included within the technical scope of this invention. Based on the principle of this application, several other modifications can also be made, which should also be considered within the protection scope of this application.

Claims

1. A desulfurized gypsum circulating calcination system, characterized in that, It includes a stirring and circulating device (01) having a stirring inlet (11) and a stirring outlet (12), a fluidized bed furnace (02) connected to the stirring outlet (12), an air distribution plate (03) disposed at the bottom of the fluidized bed furnace (02), a blower (04) arranged toward the air distribution plate (03) and used to blow the material inside the fluidized bed furnace (02), and a material collection mechanism (05) connected to the outlet of the fluidized bed furnace (02); The fluidized bed furnace (02) is provided with a first circulation port (21), which is connected to the stirring feed port (11) of the stirring circulation device (01).

2. The desulfurized gypsum circulating calcination system according to claim 1, characterized in that, Includes a dust recycling device (06); The dust inlet (61) of the dust circulation device (06) is connected to the second circulation port (22) located on the upper part of the fluidized bed furnace (02), and the dust outlet (62) of the dust circulation device (06) is connected to the stirring inlet (11) of the stirring circulation device (01).

3. The desulfurized gypsum circulating calcination system according to claim 2, characterized in that, The stirring and circulating device (01) is equipped with a dust circulation port (13); The dust circulation port (13) is located above the mixing outlet (12), and the second circulation port (22) is connected to the dust circulation port (13).

4. The desulfurized gypsum circulating calcination system according to claim 3, characterized in that, The second circulation port (22) is connected to the dust inlet (61) of the dust circulation device (06) through the first pipe (07); The middle part of the first pipe (07) is connected to the second pipe (08), and the second pipe (08) is provided with a first screen (81) at the connection with the first pipe (07). The second pipe (08) is connected to the dust circulation port (13).

5. The desulfurized gypsum circulating calcination system according to claim 4, characterized in that, The material collection mechanism (05) includes a ring mill (51), a residual material collection bin (52) with a residual material inlet (521) and a residual material outlet (522), a conveying fan (53), and a storage bin (54); One end of the ring mill (51) is connected to the discharge port of the fluidized bed furnace (02), and the other end of the ring mill (51) is connected to the residual material inlet (521). The residual material outlet (522) is connected to the storage bin (54) through the conveying pipe (09), and the conveying fan (53) is connected to the middle of the conveying pipe (09) to blow the material to the storage bin (54).

6. The desulfurized gypsum circulating calcination system according to claim 5, characterized in that, The waste material collection bin (52) is also provided with an air inlet (523), an air outlet (524), and a fine material inlet (525); The air inlet (523) is connected to the fan (04), and the air outlet (524) is connected to the air distribution plate (03); The fine material inlet (525) of the residual material collection bin (52) is connected to the front of the first pipe (07) through the third pipe (010). The third pipe (010) is provided with a second screen (101) for screening out fine dust at the connection with the first pipe (07).

7. The desulfurized gypsum circulating calcination system according to claim 2, characterized in that, It includes a valve mechanism (011) and a control mechanism electrically connected to the valve mechanism (011); The valve mechanism (011) includes a first valve (111), a second valve (112), and a third valve (113); The first valve (111) is located at the outlet of the fluidized bed furnace (02), the second valve (112) is located at the first circulation port (21), and the third valve (113) is located at the second circulation port (22).

8. The desulfurized gypsum circulating calcination system according to claim 1, characterized in that, The stirring and circulating device (01) is equipped with spiral stirring blades (14) for dispersing materials.

9. The desulfurized gypsum circulating calcination system according to claim 8, characterized in that, Includes a steam device (012) having a heat-conducting pipe (121) through which steam is passed; The heat-conducting pipe (121) passes through the stirring and circulating device (01). One end of the heat-conducting pipe (121) is connected to the steam outlet (122) of the steam device (012), and the other end of the heat-conducting pipe (121) is connected to the steam return port (123) of the steam device (012).

10. A desulfurized gypsum circulating calcination system according to claim 1, characterized in that, It includes a bucket elevator (013) and a mill (014). The feed inlet of the bucket elevator (013) is connected to the mixing outlet (12) of the mixing and circulating device (01), the discharge outlet of the bucket elevator (013) is connected to the feed inlet of the mill (014), and the discharge outlet of the mill (014) is connected to the feed inlet of the fluidized bed furnace (02).

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