Deslagging method in continuous production of fluidized bed furnace

Abstract

A deslagging method in continuous production of a fluidization fluidized bed furnace is characterized in that a deslagging and discharging port with a quantity control device is formed in the lower portion of a shell of the fluidization fluidized bed furnace, the deslagging and discharging time can be controlled, the deslagging and discharging quantity can be controlled, and the purpose that sediment can be discharged in time after the sediment appears in a fluidization chamber is achieved. Therefore, normal continuous production of the fluidized bed furnace is guaranteed.

Description

Technical Field

[0001] The invention relates to a slag removal method in the continuous production of an industrial fluidized bed furnace, and is particularly suitable for slag removal in the continuous drying production process of solid particles such as building gypsum and quartz sand produced in a fluidized bed furnace. Background Art

[0002] The current structure of a fluidized bed furnace consists of a furnace shell with a built-in heating device, a feed inlet, a discharge port, an air inlet, an exhaust and dust removal port, an inspection port, and an air distribution plate with air holes. The air distribution plate divides the interior of the fluidized bed furnace into two parts: the upper shell is the fluidizing chamber, where heating devices such as heating pipes are placed, and the lower shell is the gas collection chamber. The discharge port during production is located above the fluidized bed furnace. There is no continuous discharge port below the furnace, only a discharge port for maintenance after production is stopped.

[0003] After the fluidized bed boiling furnace starts to operate, pressurized air from the outside enters the air collecting chamber of the lower shell from the air inlet, passes through multiple air holes in the air distribution plate, and evenly enters the fluidizing chamber in the upper shell. At the same time, steam, hot air or heat transfer oil are passed through the heating pipes in the fluidizing chamber, and the fluidizing chamber is heated and the temperature is increased. The dihydrate gypsum raw material for producing building gypsum powder, such as desulfurized gypsum powder, has a water content between 10% and 15%, so it is wet and sticky, with high viscosity and poor fluidity. The stone sand, coal slag, large gypsum and other residues contained in the dihydrate gypsum raw powder are mixed with the dihydrate gypsum powder and are difficult to separate.

[0004] The building gypsum raw materials that need to be calcined or the wet raw materials of hydrated quartz sand that need to be dried move downward from the feed port above the fluidized boiling furnace and enter the fluidized chamber of the upper shell of the fluidized boiling furnace. Under the dynamic action of the air moving upward through the small holes of the air distribution plate, these raw materials will roll up and down and flow left and right in the fluidized chamber, generating fluidized motion in the fluidized chamber like water, colliding with the heating tube in the fluidized chamber, obtaining the heat energy in the heating tube and being heated or calcined, becoming a powder flow state, and flowing out of the fluidized chamber from the discharge port of the upper shell like water.

[0005] Granular raw materials vary in size, ranging from small to large. After drying and calcining in the fluidizing chamber, the small particles are discharged from the discharge port at the top of the fluidizing chamber. However, large particles and other heavy impurities cannot exit through the discharge port and instead settle on the air distribution plate below the fluidizing chamber. These large particles and other materials that accumulate above the air distribution plate during continuous production are called sediment. As this sediment accumulates on the air distribution plate, it blocks the air pores in the plate, increasing the resistance to air moving upward from the plenum below the plate into the fluidizing chamber. This hinders air from the lower plenum into the upper fluidizing chamber, ultimately affecting the normal operation of the fluidized bed furnace. Production must be halted until the lower inspection port or temporary discharge port is opened to remove the sediment, or sediment, from the air distribution plate. After clearing the sediment, the inspection port is closed and the machine is restarted to resume production.

[0006] This type of slag discharge is intermittent and can only be performed during shutdown. Furthermore, opening the air distribution plate for slag removal inevitably generates dust, causing dust pollution in the workshop. The present invention aims to ensure that large particles and other sediment are discharged in a timely manner during normal production of the fluidized bed furnace. Summary of the Invention

[0007] The present invention provides a slag discharge method for continuous production in a fluidized bed furnace, characterized in that a slag discharge port is provided on the shell of the fluidized bed furnace. The slag discharge port is arranged on the shell near the air distribution plate, or is directly opened on the air distribution plate, and extends to the outside of the lower shell through a connecting pipe, and the connecting pipe is fixed to the lower shell.

[0008] The present invention relates to a method for slag removal during continuous production in a fluidized bed furnace. The method is characterized in that a device for controlling material flow, referred to as a flow control device, is installed on the connecting pipe to the fluidized bed furnace's slag discharge outlet. The flow control device can be a material flow regulating valve or an electrically controllable valve, which controls the amount of material flowing into the lower discharge outlet by adjusting the degree of opening and closing of the valve. Alternatively, the device can be an adjustable diameter valve, an intelligent material-driven variable diameter valve, or a variable diameter valve driven by an intelligent control motor and pneumatic components, connected to the discharge outlet pipe to control the discharge amount by varying the diameter of the discharge pipe.

[0009] During normal production in a fluidized bed furnace, the amount of sediment in the dried or boiling material particles is uncertain, fluctuating from time to time and beyond human control. When the amount of sediment in the dried or boiling material particles is high, a large amount of sediment will quickly accumulate on the air distribution plate at the bottom of the fluidized bed furnace. This sediment must be promptly discharged from the furnace. In this case, the lower discharge port must be able to open quickly and have a sufficiently large discharge capacity to promptly discharge the sediment and eliminate its impact on production.

[0010] When the material particles being processed contain relatively little sediment or there is no sediment, the slag discharge port needs to be opened and closed intermittently. In this way, by operating the quantity control device, the slag discharge time and amount of slag discharge from the slag discharge port can be controlled, ensuring the continuous production of the fluidized bed furnace. The effect of achieving the effect of discharging sediment on the air distribution plate of the fluidizing chamber when it affects production is achieved, and not discharging sediment when the impact is small or not at all.

[0011] The slag discharge method for the continuous production of a fluidized bed furnace of the present invention is characterized in that the slag material discharged from the slag discharge port is sorted. In continuous production, not only large-sized and large-particle sediments are discharged through the slag discharge port, but also fine-particle materials are mixed together. What is needed is to discard the large-sized and large-particle sediments and retain the fine-particle materials. Therefore, it is necessary to use a sorting method to sort the sediment discharged from the slag discharge port, separate the large-sized and large-particle sediments from the fine-particle materials, discharge the large-sized and large-particle sediments, and recover the fine-particle materials. The sorting methods include wind sorting or screening machine sorting and other gravity sorting methods. Wind sorting is to use the difference in the wind motion of particles with different volumes and different gravities to sort them; screening machine sorting is to use the different sizes of screens to sort particles of different particle sizes.

[0012] Fluidized bed furnaces can be used to produce building gypsum powder or dry quartz sand, either with a single unit or with multiple units working together. A single multi-chamber fluidized bed furnace consists of multiple fluidized chambers, with only one feed and discharge port. The raw materials entering the furnace are dried and calcined through each fluidized chamber, and then discharged from the upper discharge port of the last fluidized chamber. Multiple units can be combined in series or parallel. Parallel operation means that multiple fluidized bed furnaces operate independently of each other, with the total output being the cumulative sum of the production output of each unit. Series operation means that multiple fluidized bed furnaces form a production line, with the output resulting from the combined operation of the multiple fluidized bed furnaces.

[0013] The present invention provides a slag discharge method for continuous production of a fluidized bed boiling furnace. The method is for continuous production of a single multi-chamber fluidized bed boiling furnace having only one feed port and an upper discharge port. The method is characterized in that a slag discharge port is provided on the lower shell of the fluidized chamber corresponding to the feed port. After the slag discharge is sorted, the fine-grained sorted material is returned to the fluidized bed boiling furnace to continue to be heated, dried or calcined, and the large-particle sediment sorted material is discharged for treatment.

[0014] The present invention provides a slag discharge method for continuous production of a fluidized bed boiling furnace. For a slag discharge method in which multiple fluidized bed boiling furnaces are connected in series for continuous production, the method is characterized in that a slag discharge port is provided on the shell of the first fluidized bed boiling furnace. After the slag discharge is sorted, large-particle sediment is discharged for treatment; and fine-particle sediment enters the next fluidized bed boiling furnace to continue to be heated, dried or calcined. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of a single-chamber fluidized bed boiling furnace Figure 2 A top view of the air distribution plate of a fluidized bed boiling furnace Figure 3 Schematic diagram of the continuous production slag removal method for a single multi-chamber fluidized bed boiling furnace Figure 4 Schematic diagram of the continuous production slag removal method for two fluidized bed boiling furnaces Figure 5 This is a schematic diagram of the continuous production slag removal method for a single fluidized bed boiling furnace.

[0016] In the attached figure: 1.1 - Blower 1 1.2 - Blower 2 1.3 - Blower 3 1.4—Blower 4 1.5—Blower 5 2.1—Air inlet pipe 1 2.2—Air inlet pipe 2 2.3 - Air inlet pipe three 2.4 - Air inlet pipe four 2.5 - Air inlet pipe five 3 - Air distribution plate 4 - Upper shell 5—Heating pipe 6.1—Feed port 1 6.2—Feed port 2 6.3—Feed port 3 6.4—Feed port 4 6.5—Feed port 5 7.1—Raw material bin 1 7.2—Raw material bin 2 7.3 - Raw material bin 3 7.4 - Raw material bin 4 8.1 - Exhaust hole 1 8.2 - Exhaust hole 2 8.3—Vent hole three 8.4—Vent hole four 8.5—Vent hole five 9.1—Discharge port one 9.2—Discharge port 2 9.3—Discharge port 3 10—Lower shell 11—Discharge pipe 12—Quantity control device 13.1—Slag discharge outlet 1 13.2—Slag discharge outlet 2 13.3 - Slag discharge outlet 3 13.4 - Slag discharge outlet 4 14 - Air hole 15 - Air distribution plate discharge port 16.1-Drum Screening Machine 1 16.2-Drum Screening Machine 2 16.3-Drum Screening Machine 3 17.1- Sediment Collection Bin 1 17.2- Sediment Collection Bin 2 17.2- Sediment Collection Bin 3 18.1- Finished Product Warehouse 1 18.2- Finished Product Warehouse 2 18.3- Finished Product Warehouse 3 19.1 - Dust Collector Outlet 1 19.2 - Dust Collector Outlet 2 19.3 - Dust Collector Outlet 3 19.4 - Dust Collector Outlet 4 20.1 - Dust Collector 1 20.2 - Dust Collector 2 20.3 - Dust Collector 3 20.4 - Dust Collector 4 21.1 - Dust Collector Exhaust Pipe 1 21.2 - Dust Collector Exhaust Pipe 2 21.3 - Dust Collector Exhaust Pipe 3 21.4 - Dust Collector Exhaust Pipe 4 22.1-Dust Collector Air Inlet 1 22.2-Dust Collector Air Inlet 2 22.3-Dust Collector Air Inlet 3 22.4—Dust collector air inlet four. DETAILED DESCRIPTION

[0017] Figure 1 This is a structural diagram of the single-chamber fluidized bed boiling furnace of the present invention. Figure 1 Fluidized bed boiling furnace structure principle: Figure 1 The fluidized bed boiling furnace is enclosed by an upper shell 4, an air distribution plate 3 and a lower shell 10. The upper shell is the fluidized chamber of the fluidized bed boiling furnace, in which a heating pipe 5 is arranged. The upper shell is provided with a feed port 6.1, an exhaust port 8.1 and an upper discharge port 9.1. The air distribution plate 3 with air holes 14 (such as Figure 2 The air distribution plate 3 is provided with an air distribution plate discharge port 15 (as shown in FIG. Figure 2 As shown), it is connected through the discharge pipe 11, passes through and is fixed on the lower shell 10. The discharge pipe 11 is equipped with a quantity control device 12 to control the size of the discharge amount. The lower end outlet of the discharge pipe 11 is a slag discharge port 13.1.

[0018] Figure 1 Fluidized bed furnace air operation and dust removal process line: Start the blower 1.1 and start the heating pipe 5 in the fluidizing chamber of the upper shell of the fluidized bed boiling furnace, or pass steam through the heating pipe 5 to heat the heating pipe 5; the external air is pressurized by the blower 1.1 and enters the air collecting chamber of the lower shell 10 through the air inlet pipe 2.1, and then passes through the air holes 14 on the air distribution plate 3 (such as Figure 2 As shown), it moves upward into the fluidizing chamber of the upper shell 4. During production, the fine dust particles in the upper shell 4 are discharged from the exhaust hole 8.1 of the upper shell 4 along with the air in the fluidizing chamber into the dust collector for dust recovery and air discharge.

[0019] Figure 1 The production process of raw material drying and calcination in fluidized bed furnace: Open the raw material bin 7.1, and allow the granular powders such as gypsum and quartz sand in the raw material bin to enter the fluidizing chamber of the upper shell 4 of the fluidized bed furnace through the feed port 6.1. Under the action of the upward moving air from the air distribution plate 3, the raw materials of hydrated gypsum, quartz sand and other granular hydrated viscous materials are dispersed and moved throughout the entire space of the fluidizing chamber of the upper shell 4, and roll up and down and move left and right in the upper shell 4 like flowing water, fully colliding with the heating tube 5, indirectly obtaining the heat energy of the heating tube 5, being heated and calcined, and finally becoming dry, loose and flowing particles.

[0020] Figure 1 Method for discharging sediment in fluidized bed boiling furnace production: exist Figure 1 In the fluidized chamber of the fluidized bed furnace, the fine particles after being dried and calcined are discharged from the upper discharge port 9.1 of the upper shell 4 under the action of the upward air movement of the air distribution plate 3. The coarse particles are too heavy to move upward due to the force of the air from the air distribution plate 3. Under the action of their own gravity, they fall in the fluidized chamber after drying and are discharged from the discharge port 15 on the air distribution plate 3 (such as Figure 2 As shown), the slag is discharged from the discharge port 13.1 through the discharge pipe 11 and the quantity control device 12; The above is the operation process of the fluidized bed boiling furnace of the present invention.

[0021] Figure 3 Schematic diagram of the slag removal method in continuous production of a single multi-chamber fluidized bed furnace Figure 3 Air operation and dust removal process circuit of a single multi-chamber fluidized bed boiling furnace: During production operation, the dust collector 20.1 is first turned on to generate negative pressure in the fluidized chamber of the fluidized boiling furnace. The heating tubes in the fluidized boiling furnace are turned on to increase the temperature. The blower 2.2 is then turned on, and natural air flows through the blower 2.2 and is pressurized. The air then enters the four air collecting chambers from the four air inlets 2.2 on the lower shell of the fluidized boiling furnace. The air then moves upward through the air holes in the respective air distribution plates and enters the four fluidized chambers of the fluidized boiling furnace. Some fine solid particles in the dried raw material are discharged along with the air from the exhaust holes 28.2 on the shell, and enter the dust collector 20.1 through the dust collector air inlet 22.1. The filtered air is then discharged directly into the atmosphere through the dust collector exhaust pipe 21.1. The filtered solid particles then return to the fluidized boiling furnace feed inlet 6.2 from the dust collector outlet 19.1 and enter the fluidized boiling furnace to continue drying and calcining.

[0022] Figure 3 The production process of raw material drying and calcining in a single multi-chamber fluidized bed boiling furnace: Figure 3 A single multi-chamber fluidized bed furnace has only one feed port 6.2 and one upper discharge port 9.2. Desulfurized gypsum raw material or quartz sand raw material enters the first fluidizing chamber of the fluidized bed furnace from the raw material bin 7.2 through the feed port 6.2, moves downward, and is fluidized by the upward air flow. There, it collides with the heating tubes in the fluidizing chamber, indirectly absorbing heat energy and being dried and calcined. The dried and calcined fine particles move upward, successively entering the second, third, and fourth fluidizing chambers, until they are finally discharged from the upper discharge port 9.2 of the fluidized bed furnace and stored in the finished product bin 18.1.

[0023] Figure 3 Method for discharging sediment in the production of a single multi-chamber fluidized bed boiling furnace: The slag discharge port 2 13.2 of this single multi-chamber fluidized bed furnace is located on the lower shell corresponding to the raw material feed port 2 6.2. Coarse particles and other sediments dried or calcined in the fluidized bed cannot move upward and instead descend to accumulate on the air distribution plate. Finally, after being discharged from the fluidized bed furnace through the slag discharge port 2 13.2, they enter the drum screening machine 16.1 for sorting. The fine particles obtained by sorting are then returned to the fluidized bed furnace feed port 2 6.2 and re-enter the fluidized bed furnace for drying and calcination. The coarse sediment obtained by sorting is directly discharged into the sediment collection bin 17.1. In this way, large particles of sediment do not accumulate on the air distribution plate in the fluidized bed furnace, but are continuously discharged outside the fluidized bed furnace, ensuring continuous production.

[0024] Figure 4 Deslagging method for two multi-chamber fluidized bed furnaces in series production Figure 4 Air operation and dust removal process lines for two multi-chamber fluidized bed boiling furnaces: The air operation and dust removal process line of the first fluidized bed boiling furnace: Dust collector No. 2 20.2 is turned on to generate negative pressure in the fluidizing chamber of the first fluidized bed furnace. The heating tubes in the fluidized bed furnace are turned on to increase their temperature. Blower No. 3 1.3 is turned on, and natural air is pressurized by blower No. 3 1.3 and enters the first fluidized bed furnace through air inlet No. 3 2.3, where it moves upward. Fine dust particles from the dried raw material are discharged along with the air through exhaust holes No. 3 8.3 on the first fluidized bed furnace and enter dust collector No. 2 20.2 through dust collector air inlet No. 2 22.2, where air and dust are separated. The separated air is discharged into the atmosphere through dust collector exhaust pipe No. 2 21.2. The separated dust is discharged from dust collector discharge port 19.2 of dust collector No. 2 20.2 and returns to feed port No. 3 6.3 to enter the first fluidized bed furnace for further drying.

[0025] Air operation and dust removal process line of the second fluidized bed boiling furnace: Dust collector 20.3 is turned on to generate negative pressure in the fluidized chamber of the second fluidized bed furnace. Blower 4 1.4 is turned on, and natural air is pressurized by blower 4 1.4 and enters the various fluidized chambers of the second fluidized bed furnace through air inlet pipe 4 2.4, where it moves upward. Fine dust particles generated by drying and calcining in the fluidized chambers are discharged with the air through exhaust holes 4 8.4 in the upper shell, and enter dust collector 3 20.3 through dust collector air inlet 3 22.3 for separation of air and dust. The separated air is discharged into the atmosphere through dust collector exhaust pipe 3 21.3. The separated fine dust particles are discharged from dust collector discharge port 3 19.3 of dust collector 3 20.3, then return to feed port 4 6.4 and enter the second fluidized bed furnace for cyclic drying and calcination.

[0026] Figure 4 The production process of raw material drying and calcining in two multi-chamber fluidized bed furnaces and the emission of sludge: Desulfurized gypsum raw material or quartz sand containing a viscous substance enters the first fluidized bed furnace through the raw material bin 3 7.3 and the feed port 3 6.3. It moves downward within the fluidizing chamber, where it is fluidized by the upward-moving air and collides with the heating tubes therein, absorbing the heat from them and drying them. The raw material is then discharged through the lower slag discharge port 3 13.3. After being sorted by the drum screen 2 16.2, the coarse sediment in the raw material is discharged into the sediment collection bin 17.2. The finer fraction then enters the second fluidized bed furnace through the feed port 4 6.4. It then passes through the first, second, third, and fourth fluidizing chambers, where it is dried and calcined. Finally, it is discharged through the upper discharge port 3 9.3 of the shell and into the finished product bin 2 18.2 for collection and storage.

[0027] Figure 5 Slag removal method for a single fluidized bed boiling furnace Figure 5 The single-chamber fluidized bed furnace has no discharge port on the upper part of the shell, but has a slag discharge port 4 at the lower part of the shell. This system is used for the drying production and classification of desulfurized gypsum and quartz sand raw materials.

[0028] Figure 5 Air operation and dust removal process circuit of a single fluidized bed boiling furnace: Start the dust collector 4 20.4 operation. Figure 5 Negative pressure is generated in the fluidized bed furnace, the heating tube in the fluidized bed furnace is turned on to heat up the heating tube, and the blower V1.5 is turned on. Natural air is pressurized by the blower V1.5, enters the air collecting chamber of the lower shell of the fluidized bed furnace through the air inlet pipe V2.5, and after being homogenized, enters the fluidized bed chamber of the upper shell through the air holes of the air distribution plate and moves upward; Fine dust particles formed during the drying and calcining of the raw materials in the fluidized chamber are discharged along with the air from the exhaust holes 58.5 in the upper shell, enter the dust collector 420.4 through the dust collector air inlet 422.4, and after the air and dust are separated, the separated air is discharged into the atmosphere through the dust collector exhaust pipe 421.4. The separated fine particles are discharged from the dust collector discharge port 419.4 of the dust collector 420.4, return to the feed port 56.5, and re-enter the fluidized bed furnace for cyclic drying and calcination.

[0029] Figure 5 The production process of raw material drying and calcining in a single fluidized bed furnace and the emission of sludge: Desulfurized gypsum or quartz sand raw material flows from raw material bin (four) 7.4 through feed port (five) 6.5 into the fluidizing chamber of the fluidized bed furnace, where it moves downward. It is dispersed by the upwardly moving air on the air distribution plate, causing fluidization. It collides with the heating tubes in the fluidizing chamber, absorbs heat from the heating tubes, and is dried. It is then discharged directly from slag discharge port (four) 13.4 on the lower shell of the fluidized bed furnace and enters the drum screening machine 16.3 for sorting. The coarse and large-particle sediment is collected and discharged directly into sediment collection bin (three) 17.3, while the fine-particle sediment enters finished product bin (three) 18.3 for storage.

Claims

1. A slag discharge method in continuous production of a fluidized bed boiling furnace, characterized in that a slag discharge port is provided on the shell of the fluidized bed boiling furnace.

2. The slag removal method in the continuous production of the fluidized bed furnace according to claim 1, characterized in that The slag discharge port is connected with a quantity control device.

3. The slag removal method in the continuous production of the fluidized bed furnace according to claim 1, characterized in that The discharged materials from the slag discharge port are sorted and separated.

4. The slag removal method in the continuous production of the fluidized bed furnace according to claim 1, characterized in that A single multi-chamber fluidized bed boiling furnace is used for production, and a slag discharge port is arranged on the lower shell of the fluidized chamber corresponding to the feed port.

5. The slag removal method in the continuous production of the fluidized bed furnace according to claim 1, characterized in that The production is carried out using multiple fluidized bed boiling furnaces. A slag discharge port is provided on the shell of the first fluidized bed boiling furnace. After the discharged material is sorted, the fine-grained material directly enters the next fluidized bed boiling furnace.

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