Energy-saving gas type perlite expansion furnace equipment production line

Abstract

The invention discloses an energy-saving gas type perlite expansion furnace equipment production line, and solves the technical problems of low waste heat utilization rate, serious dust dissipation and high conveying energy consumption in the traditional process. Comprising a double-circulation preheating system, the retention time of ore sand is prolonged through an outer / middle / inner core pipe three-layer reverse spiral structure, raw sand is efficiently preheated through heat conduction of high-temperature waste gas of an expansion furnace on an inner core pipe heating cavity, and gas consumption is reduced; according to the hot air combustion-supporting integrated system, a combustion-supporting air preheating air box is integrated in the middle section of a horizontal guide pipe communicated with an expansion furnace, interlayer hot air is introduced to be supplied to a burner, and the fuel utilization rate and the energy-saving rate are increased; according to the dust closed-loop collection system, the cyclone separator is connected with the multi-tube dust remover and the double-bag dust remover in series, and is matched with the spiral packing auger and the two-stage air-lock valve to realize full-sealed centralized collection of micro-powder, so that the dust escape rate is low. The production line is additionally provided with an intelligent system for control, on-site operation can be achieved through a man-machine interface, remote control can be achieved based on a network platform, and the intelligent level is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of perlite expansion equipment, in particular to an energy-saving gas-fired perlite expansion furnace equipment production line. Background Art

[0002] Perlite is a glassy rock formed by the rapid cooling of acidic lava from volcanic eruptions. It is named for its arc-shaped cracks and pearly fissures formed by condensation. It has a water content of approximately 2-6%. When the acidic lava erupts to the surface, it solidifies upon cooling, trapping large amounts of water vapor within the glass. When heated to a softening point during roasting, the water vapor in the glass generates immense pressure, causing the perlite particles to rapidly expand. When the expanded particles cool below their softening temperature, they solidify into a cavity structure, forming a porous expanded perlite with a wide range of applications.

[0003] During perlite expansion, rapid water volatilization can cause the perlite to crack. Therefore, the ineffective water content of the perlite raw material sand should be removed before expansion. Extensive testing in domestic and international laboratories and production plants has shown that expanded perlite achieves optimal results and the highest expansion multiple (i.e., the lowest bulk density) when its effective water content is between 2.2% and 2.4%. Therefore, the production process of expanded perlite involves two key steps: preheating and expansion.

[0004] However, the preheating furnace currently used for expanded perlite usually uses electric heating or gas heating for preheating, such as a Chinese patent for an expanded perlite preheating furnace, whose publication number is CN206944710U, which includes a horizontally arranged cylindrical furnace core, four rollers arranged below the front end and the rear end of the furnace core, a driving mechanism for driving the furnace core to rotate, a refractory brick furnace shell arranged on the outside of the furnace core, a gas air intake pipe, an air distribution pipe and an air distribution fan, a furnace chamber is provided between the refractory brick furnace shell and the furnace core, a heating port is provided on the side wall of the refractory brick furnace shell directly below the furnace core, the end of the gas intake pipe passes through the heating port and extends into the furnace chamber, the air distribution fan is provided at the entrance of the air distribution pipe, and the air distribution pipe is connected to the gas intake pipe.

[0005] As can be seen, most existing technologies use an additional heating source to heat the perlite preheating furnace, while ignoring the preheating generated by the expansion furnace itself, resulting in energy and economic waste. In addition, when the bottom burner of the expansion furnace supports combustion, it usually preheats the combustion air to increase combustion efficiency. If an external heating device is used to heat the combustion air, it will also waste energy. There are existing technologies that recover the expansion furnace preheat to heat the burner combustion air, but this is a separate device.

[0006] Furthermore, the perlite expansion process generates a certain amount of dust. Typically, dust collection is accomplished by collecting dust in a baghouse hopper, for example. Once a sufficient amount of dust accumulates in the hopper, a valve at the bottom of the hopper is opened to discharge the dust. Currently, existing technologies typically utilize a fixed chute located below the hopper to collect dust (e.g., Chinese Invention Patent CN 207203747U, "New Micro-Dust Waste Recovery Equipment for Perlite Expansion Processing"). However, during the perlite expansion process, multiple dust collectors are typically deployed. Separately collecting dust from each dust collector group inevitably results in low efficiency, and the collection process can easily generate dust, causing pollution within the workshop. Summary of the Invention

[0007] In response to the above technical problems, the present invention provides an energy-saving gas-fired perlite expansion furnace equipment production line, which utilizes the high-temperature exhaust gas generated during the expansion furnace production process to generate heat conduction when passing through the core tube in the preheating furnace to preheat the raw sand. The raw sand is designed to be in a reciprocating cycle in the preheating furnace, so that the perlite ore sand has a more sufficient preheating time in the preheating furnace and the waste heat is more fully utilized. At the same time, a high-efficiency and energy-saving open-hole expansion furnace burner is developed. The combustion-supporting air of the burner uses the hot air passing through the horizontal tube interlayer connected to the expansion furnace, so that the combustion fire type, atmosphere, and temperature field match the expansion process, thereby making the combustion more complete and the energy-saving effect significant. The dust collection system designed by the present invention can collect the dust collected by all dust removal equipment in a centralized manner, which not only avoids secondary dusting, but also has a high degree of automation.

[0008] An energy-saving gas-fired perlite expansion furnace equipment production line includes an expansion furnace and a double-circulation perlite ore preheating system. An energy-saving burner is installed at the bottom of the expansion furnace, and the energy-saving burner is connected to a combustion-supporting fan. The production line also includes:

[0009] A water-cooled horizontal tube blanking system installed on top of the expansion furnace. The blanking system includes:

[0010] a) an elbow pipe connected to the material outlet at the top of the expansion furnace, wherein the elbow pipe has a material channel bent at a certain angle;

[0011] b) a circulating cooling module, comprising a water tank sleeved on the outside of the elbow pipe, wherein the sidewalls and bottom of the water tank are respectively provided with mounting interfaces that seal with both ends of the elbow pipe, and the water tank is connected to the cooling water circulation system;

[0012] c) a waste heat recovery assembly comprising a horizontally arranged guide pipe, one end of which is connected to the elbow pipe outlet and the other end of which is connected to a heating chamber formed by an inner core pipe of a double-circulation perlite ore preheating system;

[0013] d) a material distribution device, comprising a drop hopper provided at the bottom of the guide tube, a drop opening provided in the drop hopper at the bottom of the guide tube, and the drop hopper being in communication with a finished product bin;

[0014] e) The waste heat recovery assembly further includes a combustion air preheating blower sleeved in the middle section of the guide pipe, the blower being provided with an air inlet and a preheated air outlet connected to the combustion air blower;

[0015] The perlite material enters the double-circulation perlite ore preheating system for preheating and then enters the expansion furnace. After expansion, the perlite material flows into the water-cooled horizontal tube blanking system. Part of the material flows into the finished product silo from the blanking hopper due to its own weight, and the other part of the material flows into the inner core tube of the double-circulation perlite ore preheating system to form a preheating source.

[0016] It also includes a cyclone separator for receiving the material flow in the inner core tube. Under the action of centrifugal force, the finished material is sent to the finished product silo, and the tail gas containing dust passes through the multi-tube dust collector and then enters the first bag dust collector;

[0017] A second bag dust collector, the second bag dust collector is connected to the top of the finished product silo;

[0018] Two system fans are connected to the outlets of the first bag filter and the second bag filter respectively.

[0019] Furthermore, the production line also includes a multi-port micro-powder centralized collection system, which includes:

[0020] The spiral conveying dragon, the discharge ports of the first bag dust collector and the second bag dust collector are respectively connected to the conveying cavity of the spiral conveying dragon;

[0021] An air lock is connected between the multi-tube dust collector and the conveying cavity of the spiral conveying auger and on the discharge port of the spiral conveying auger.

[0022] Furthermore, the production line also includes a finished product feeding system, including a first feeding pipe and a second feeding pipe, wherein the opening of the pipe wall of the first feeding pipe is connected to the discharge port of the cyclone separator, and the opening of the pipe wall of the second feeding pipe is connected to the discharge port of the hopper;

[0023] One end of the first feeding pipe and the second feeding pipe are both located in the finished product bin as the discharge port ends;

[0024] The other ends of the first feeding pipe and the second feeding pipe are respectively connected to a feeding fan, and the air outlet of the feeding fan is connected to a venturi tube whose opening gradually shrinks toward the distal end. The air outlet of the venturi tube forms a negative pressure at the outlet of the first and second feeding pipes, and the auxiliary materials are sucked into the first and second feeding pipes.

[0025] Furthermore, the double-circulation perlite ore preheating system comprises:

[0026] Coaxially nested three-layer tube structure: from outside to inside, it is outer tube, middle tube and inner core tube;

[0027] Double circulation material channel:

[0028] a) an outer material channel is formed between the outer tube and the middle tube, and a first spiral conveying structure is provided on the inner wall of the outer material channel;

[0029] b) an inner material channel is formed between the middle tube and the inner core tube, and a second spiral conveying structure is provided on the inner wall of the inner material channel;

[0030] Rotation drive unit: a flip drive mechanism connected to the outer tube, used to drive the tube body to rotate around the axis;

[0031] Feed assembly: a hopper assembly provided at the first axial end of the outer tube, comprising a plurality of circumferentially distributed digging hoppers and a first feed port connected thereto, wherein the first feed port leads to the outer material channel;

[0032] Material diverting interface: a second feed port provided at the second axial end of the middle tube, used to direct the material output from the outer material channel into the inner material channel;

[0033] Preheating material outlet (discharge port): extends to the end opening of the middle tube outside the first axial end of the outer tube;

[0034] Heating chamber: consists of the inner cavity of the inner core tube;

[0035] Reverse conveying structure: The rotation direction of the first spiral conveying structure is opposite to that of the second spiral conveying structure, so that the material is conveyed from the first end to the second end in the outer material channel and from the second end to the first end in the inner material channel.

[0036] Furthermore, the first spiral conveying structure includes:

[0037] a first continuous spiral conveying section adjacent to the first feed inlet;

[0038] The first intermittent pushing section adjacent to the second feed inlet is composed of first inclined pushing plates arranged along a spiral line. Preferably, the first spiral conveying structure can be composed of first continuous spiral conveying sections adjacent to the first and second feed inlets, and first inclined pushing plates arranged along a spiral line between the two first continuous spiral conveying sections. In this embodiment, a continuous spiral conveying section is also provided at the second feed inlet, making it easier for the material to be squeezed into the second material inlet.

[0039] Furthermore, the second spiral conveying structure includes:

[0040] a second continuous spiral conveying section adjacent to the second feed inlet;

[0041] The second intermittent pushing section adjacent to the preheated material outlet is composed of second inclined pushing plates arranged along a spiral line.

[0042] Furthermore, the first spiral conveying structure is fixed on the inner side wall of the outer tube and is located in the outer material channel; the second spiral conveying structure is fixed on the inner side wall of the middle tube and is located in the inner material channel.

[0043] Furthermore, the production line also includes a preheating feed shell, in which an annular feed cavity is formed, and multiple hoppers are fitted in the annular feed cavity. The upper end of the annular feed cavity is connected to a feed elevator, and the lower part of the feed elevator receives the material and lifts the material to the annular feed cavity.

[0044] Furthermore, the system fan is connected to the chimney.

[0045] Furthermore, the preheated material output from the preheating material outlet enters the expansion furnace through the buffer bin and the distribution hopper device.

[0046] The beneficial effects of the present invention are:

[0047] 1. By setting up the outer material channel and the inner material channel, the perlite ore raw material enters from the first feed port at the head of the outer material channel and is spirally conveyed to the second feed port at the tail and enters the inner material channel. The inner material channel spirally conveys the material to the discharge port at the head. After double-return conveying, the heating time and heating distance of the material are increased. Under the same preheating temperature, pipeline length and speed, the preheating effect is improved. Moreover, due to the longer preheating time, the heating temperature is lower than that of the single-pass material channel, which can also achieve a better preheating effect and save heating energy.

[0048] 2. The inner core tube is located inside the two layers of material channels, and the inner cavity of the inner core tube constitutes a heating cavity, so that the temperature of the inner material channel is higher than that of the outer material channel. The preheating temperature of perlite is generally between 200-400°C. In the preheating process of the present invention, the material first passes through the outer material channel, and then passes through the inner material channel, and the heating temperature is from low to high, so that the outer layer low temperature stage (for example, 200-250°C): mainly removes free water and weakly bound water (the desorption rate is slow). The inner layer medium temperature stage (for example, 300-400°C): the remaining weakly bound water and strongly bound water are controllably released in the unblocked moisture channel. The traditional technology directly preheats at medium temperature (for example, 350°C), causing the water to vaporize rapidly and causing a sharp increase in the internal steam pressure; direct high temperature causes the surface of the particles to dry quickly to form a "hard shell", which hinders the internal steam from overflowing, resulting in local pressure accumulation and microcracks. Therefore, compared with direct high-temperature preheating, the core advantage of the present invention is that it can more finely control the moisture removal process, avoid thermal stress concentration, and significantly reduce the risk of particle damage.

[0049] 3. In the spiral conveying structure with a combination of continuous spiral blades and pusher plates, a continuous spiral blade is set at the feed port so that the material is quickly pushed forward after entering. Then, multiple pusher plates arranged in a spiral pattern are intermittently set to enlarge the material cavity. In the process of overall tumbling driven by the outer tube, the material becomes looser and can be more fully in contact with the hot air in the cavity. The intermittent pusher plates save material.

[0050] 4. Full-process closed-loop dust collection:

[0051] The multi-stage dust removal system (cyclone separator → multi-tube dust collector → first bag dust collector) is combined with the micro powder centralized collection system (screw auger + air lock) to prevent secondary dust;

[0052] The finished product silo is equipped with a second bag dust collector to cover the dust sources of the entire production line;

[0053] Centralized processing design: Dust from the double-bag dust collector is centrally transported via a spiral auger and discharged through a sealed airlock, improving automation and environmental compliance.

[0054] Negative pressure conveying to prevent leakage: The first / second feeding pipe adopts a Venturi tube to generate negative pressure to assist in suctioning the material, reducing the risk of dust leakage during material transportation.

[0055] 5. The cooling water circulating in the water tank is used to cool the material flow in the elbow pipe, so that the finished material is quickly converted from a molten state to a fixed particle state, preventing the finished particles in the molten state from sticking to the elbow pipe and causing material accumulation or even pipe congestion.

[0056] 6. By intersecting horizontal tubes and drop hoppers, a portion of the hotter material flow enters the preheating furnace's heating cavity, heating the furnace. The remaining portion falls through the drop hopper due to gravity and enters the finished product silo directly. This balances the material flow, allowing the material heated in the preheating furnace to smoothly enter the finished product silo from the cyclone separator under the system's induced draft. This fully utilizes preheating to heat the preheating furnace. The energy-saving burner uses hot air from the horizontal tube interlayer to assist combustion, achieving improved combustion efficiency and energy savings (increased fuel utilization and reduced emissions). BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0058] Figure 1 This is a main structural diagram of the present invention;

[0059] Figure 2 This is a later structural diagram of the present invention;

[0060] Figure 3 It is a three-dimensional diagram of the present invention;

[0061] Figure 4 This is a three-dimensional diagram of the water-cooled horizontal tube blanking system of the present invention;

[0062] Figure 5 It is a sectional perspective view of the water-cooled horizontal tube blanking system of the present invention;

[0063] Figure 6 A perspective view of the bellows and blanking hopper of the water-cooled horizontal tube blanking system of the present invention;

[0064] Figure 7 A three-dimensional diagram of the water tank of the water-cooled horizontal tube blanking system of the present invention;

[0065] Figure 8 This is a three-dimensional diagram of an embodiment of a water-cooled horizontal tube blanking system of the present invention in which the middle section of the guide tube is thicker;

[0066] Figure 9 A three-dimensional diagram of the preheating furnace body of the double-circulation perlite ore preheating system of the present invention;

[0067] Figure 10 A sectional view of a partial perspective of the preheating furnace body of the double-circulation perlite ore preheating system of the present invention;

[0068] Figure 11A sectional view from a second perspective of a preheating furnace body of the double-circulation perlite ore preheating system of the present invention;

[0069] Figure 12 This is a partial sectional view of the preheating furnace body of the double-circulation perlite ore preheating system of the present invention from three perspectives;

[0070] Figure 13 A perspective view of the dual-circulation perlite ore preheating system of the present invention (the outer and middle tubes are transparent);

[0071] Figure 14 This is a structural diagram of the finished product feeding system of the present invention;

[0072] Figure 15 This is a structural diagram of the multi-port micropowder centralized collection system of the present invention;

[0073] Figure 16 This is a connection diagram between the wind box, combustion-supporting blower and energy-saving burner of the present invention;

[0074] Figure 17 A case reference diagram for the overall operation of the present invention.

[0075] Description of the accompanying drawings: 1. expansion furnace;

[0076] 2. Double-circulation perlite ore preheating system; 201, outer tube; 20101, outer material channel; 202, middle tube; 20201, inner material channel; 203, inner core tube; 20301, heating chamber; 204, first spiral conveying structure; 20401, first continuous spiral conveying section; 20402, first intermittent pushing section; 20402a, first inclined pushing plate; 205, second spiral conveying structure; 20501, second continuous spiral conveying section; 20502, second intermittent pushing section Material section; 20502a, second inclined push plate; 206, flip drive mechanism; 20601, first tug; 20602, second tug; 20603, first gear; 20604, second gear; 20605, motor; 20606, first support; 207, hopper assembly; 20701, digging hopper; 20702, first feed port; 208, second feed port; 209, preheated material outlet; 210, preheated feed housing; 211, annular feed chamber; 212, feed elevator;

[0077] 3. Energy-saving burner; 301. Combustion-supporting fan;

[0078] 4. Water-cooled horizontal tube blanking system;

[0079] 401, elbow pipe; 402, guide pipe; 40201, blanking port; 40202, middle section of pipe body; 40203, thermocouple connection port; 403, water tank; 40301, cooling water inlet; 40302, cooling water outlet; 40303, mounting port; 404, blanking hopper; 40401, arc-shaped notch; 405, bellows; 40501, air inlet; 40502, air outlet;

[0080] 5. Finished product silo; 6. Cyclone separator; 7. Multi-tube dust collector;

[0081] 8. First bag dust collector; 9. Second bag dust collector; 10. System fan;

[0082] 11. Multi-port micro powder centralized collection system; 1101. Spiral conveying dragon; 1102. Air shutoff device;

[0083] 12. Finished product feeding system; 1201. First feeding pipe; 1202. Second feeding pipe; 1203. Feeding fan; 1204. Venturi tube;

[0084] 13. Chimney; 14. Buffer bin and distribution hopper device. DETAILED DESCRIPTION

[0085] The following is a combination of the embodiments of the present invention Figure 1-17 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort shall fall within the scope of protection of the present invention.

[0086] In the present invention, raw ore is unloaded into the upper hopper and lifted by a feed elevator 212 (bucket elevator) into the dual-circulation perlite ore preheating system 2 (drying furnace). Under the rotation of the dual-circulation perlite ore preheating system 2, the raw material is brought into the drying furnace's inner layer (outer material channel 20101), flowing from the furnace head to the furnace tail for initial preheating. After reaching the furnace tail, the raw material automatically falls into the inner second layer (inner material channel 20201). Under the rotation of the drying furnace, the raw material flows from the furnace tail to the furnace head for a secondary preheating, removing some of the crystal water within the ore. The dehydrated raw material falls into the buffer bin and is evenly fed into the expansion furnace 1 through a distribution hopper. The heated combustion-supporting air causes the flames emitted by the energy-saving burner 3 to heat the interior of the expansion furnace 1 to above 1000°C. Under the high temperature conditions, the raw material ore instantly expands 10-20 times in volume due to the vaporization of the remaining crystal water within, forming a porous structure. The expanded perlite is transported upward by the system's induced draft (system fan 10) to the water-cooled horizontal tube drop system 4. After cooling in the circulating cooling water tank 403, the material enters the cross-section formed by the guide pipe 402 and the drop hopper 404. Approximately 60% of the finished product falls into the drop hopper 404 and is transported to the finished product silo 5 for storage via the feed fan 1203. The remaining 40% enters the drying furnace's inner core 203 pipe under the negative pressure generated by the system's induced draft, passing through the drying furnace's inner core pipe 203 and into the cyclone separator 6, where it conducts heat to the drying furnace. A cyclone separator is installed at the tail of the drying furnace. Under the action of centrifugal force, the finished product falls to the lower portion and is transported by the feed fan 1203 to the finished product silo 5 for storage. The dust-laden exhaust gas enters the multi-tube dust collector 7 for pressure reduction and temperature reduction. The reduced-pressure and cooled exhaust gas then enters a pulse bag filter for secondary filtration, further filtering out dust. The treated exhaust gas is discharged through a chimney to meet standards. Finished products are packaged through the receiving port at the bottom of the silo 5 before being stored or sold. A combustion air preheating box 405 is installed on the outer layer of the material guide pipe 402. This box collects heat from the finished products in the material guide pipe 402, heats the air in the combustion air preheating box 405, and then delivers it to the burner through the combustion air blower 301. A bag dust collector is connected to the top of the finished product silo to filter dust that enters the silo.

[0087] Considering the performance of expanded perlite, the micropowder collected by the multi-tube dust collector 7, the first bag filter 8, and the second bag filter 9 during production accounts for a certain proportion, affecting storage. This reduces the price of the fine powder when used as secondary material. This design adds a fine powder collection system to centrally collect the fine powder collected by all dust removal equipment. The collected fine powder is then transported by a spiral cage to the finished product chain elevator, which then elevates it to the secondary silo. This spiral cage is designed with two interfaces: interface 1 for returning the fine powder to the secondary finished product silo, and interface 2 for collecting the fine powder when it is not needed for secondary material processing. Air shut-off valves 1102 are installed at both interfaces.

[0088] In the present invention, the production line can be controlled by an intelligent system. This intelligent control system manages the production line's operations, for example, controlling multiple sensors, motors, fans, and burners across multiple production lines. For example, the intelligent system can adjust the burner power and, by monitoring the temperature within the horizontal material guide pipe, regulate the cooling water temperature and flow rate within the water tank, thereby adjusting the material flow temperature output from the guide pipe. The rotation speed of the preheating furnace can be adjusted by monitoring the temperature within the outer and inner material channels to ensure effective preheating of the perlite ore. The intelligent system can also control the operation of the branched micro-powder collection system, enabling automated micro-powder collection. Furthermore, the on-site control cabinet for the equipment can utilize a human-machine interface (HMI) operation table, with panel buttons and instrument functions clearly labeled and a layout that aligns with the rationality of process startup sequences. Remote control is achieved using a DCS information collection system and a 5G network data platform. Mobile phone apps or computer software can be used to monitor equipment operating parameters, provide real-time images, debug process parameters, and start and stop the equipment.

[0089] Example 1, as an embodiment of the present invention, specifically describes an embodiment of the double-circulation perlite sand preheating system 2. Figure 9-13 shown.

[0090] This embodiment includes a preheating furnace, which includes:

[0091] The coaxially nested three-layer tube structure is composed of an outer tube 201, a middle tube 202 and an inner core tube 203 from the outside to the inside. In this embodiment, the tube structure is placed horizontally, and a seal is formed between the first end and the second end of the outer tube 201 and the middle tube 202 (the orientation of this embodiment is Figure 1 (In the orientation shown in FIG, the first end is the right end and the second end is the left end), the second end of the middle tube 202 is fixed to the inner sidewall of the second end of the outer tube 201, and the first end of the middle tube 202 extends outside the first end of the outer tube 201. The first and second ends of the inner core tube 203 extend out of the first and second ends of the middle tube 202, respectively, and the second end of the outer tube 201 is sealed to the inner core tube 203.

[0092] Double circulation material channel:

[0093] a) An outer material channel 20101 is formed between the outer tube 201 and the middle tube 202, and a first spiral conveying structure 204 is provided on the inner wall of the outer material channel 20101; the outer material channel 20101 is used to preheat the pearlite ore raw material at the first low-temperature stage; the first spiral conveying structure 204 is fixed to the inner wall of the outer tube 201 and is located within the outer material channel 20101;

[0094] b) An inner material channel 20201 is formed between the middle tube 202 and the inner core tube 203, and a second spiral conveying structure 205 is provided on its inner wall. Inner material channel 20201 preheats the perlite ore at a second intermediate temperature stage. Second spiral conveying structure 205 is fixed to the inner wall of middle tube 202 and located within inner material channel 20201.

[0095] Rotational drive unit: A turnover drive mechanism 206 connected to the outer tube 201 is used to rotate the tube about its axis. The rotational drive unit drives the tube to rotate, and during this process, the spiral conveying structure operates to transport the material. This tube rotation causes the material within the outer and inner material channels 20101 and 20201 to move axially, propelled by the spiral structure. Simultaneously, the material is carried aloft by the tube walls and then falls freely, creating a continuous dispersion. This dynamic tumbling continuously exposes each particle of ore to the hot air flow, preventing uneven heating caused by static accumulation.

[0096] Feeding assembly: The hopper assembly 207, located at the first axial end of the outer tube 201, comprises multiple circumferentially distributed hoppers 20701 and a first feed port 20702 connected thereto. The first feed port 20702 leads to the outer material channel 20101. The bottom of each hopper 20701 is equipped with a feed bin. During the tube's rotation, the multiple hoppers 20701 sequentially transfer material from the feed bin through the first feed port 20702 into the outer material channel 20101, ensuring continuous feeding of the preheating furnace.

[0097] Material diverting interface: A second feed port 208 is provided at the second axial end of the middle tube 202, used to introduce the material output from the outer material channel 20101 into the inner material channel 20201; there are multiple second feed ports 208, which are evenly distributed on the circumference of the middle tube 202.

[0098] Preheated material outlet 209: extends to the end opening of the middle tube 202 outside the first axial end of the outer tube 201;

[0099] Heating chamber 20301: consists of the inner cavity of the inner core tube 203;

[0100] Reverse Conveying Structure: The first spiral conveying structure 204 rotates in the opposite direction to the second spiral conveying structure 205, conveying material from the first end to the second end within the outer material channel 20101 and from the second end to the first end within the inner material channel 20201. The reverse spiral design achieves a double preheating path within a limited length. Both the first and second spiral structures can be constructed with continuous spiral blades.

[0101] The production line also includes a preheating feed housing 210, which defines an annular feed chamber 211. Multiple scoop hoppers 20701 fit within the annular feed chamber 211. The upper end of the annular feed chamber 211 is connected to a feed elevator 212, which receives material at its lower portion and lifts and delivers it to the annular feed chamber 211. After entering the annular feed chamber 211, the material is sequentially scooped up by the multiple scoop hoppers 20701.

[0102] As an example in this embodiment, the flip driving mechanism 206 includes:

[0103] First tugboats 20601 fixed to both ends of the outer tube 201;

[0104] The second tugs 20602 are in rolling engagement with the first tugs 20601. Preferably, the second tugs 20602 have flanges at both ends of the axial direction, and the first tugs fit into the annular grooves formed by the flanges at both ends. This arrangement can effectively prevent the first tugs 20601 from detaching from the second tugs 20602.

[0105] The first support 20606, the first tugboat 20602 is rotatably engaged on the first support 20606; the second tugboat 20602 constitutes a support for the first tugboat 20601.

[0106] Drive Gear Set: A first gear 20603 fixed to the outer tube 201 meshes with a second gear 20604 driven by a motor 20605. The motor 20605 drives the second gear 20604, which in turn drives the first gear 20603. The first gear rotates the outer tube 201, which in turn rotates the first pulleys 20601 at both ends. The first pulleys 20601 then drive the second pulleys 20602. This simultaneously drives the first and second spiral conveying structures 204, 205 to convey materials in opposite directions. The pulleys at both ends effectively support the tube structure.

[0107] When the preheating furnace in the present invention rotates as a whole, the inlet end of the inner core tube and the outlet of the guide tube of the water-cooled horizontal tube blanking system are connected through a first transfer shell. Similarly, the outlet of the inner core tube and the inlet of the cyclone separator are connected through a first transfer shell. The inner core tube is rotatably connected to the first transfer shells at both ends thereof, and the outlet of the guide tube and the inlet of the cyclone separator are respectively connected to the corresponding first transfer shells.

[0108] A second transfer housing is located at the preheated material outlet 209. The middle tube 202 is rotatably connected within the second transfer housing. The lower end of the second transfer housing is connected to the buffer bin and the material distribution hopper. In this embodiment, the inner core tube extends through the second transfer housing, and the outlet portion is rotatably connected to the second transfer housing. After passing through the second transfer housing, the inner core tube rotates and connects to the first transfer housing.

[0109] As an example of this embodiment, the first spiral conveying structure 204 includes:

[0110] A first continuous spiral conveying section 20401 adjacent to the first feed inlet 20702;

[0111] The first intermittent pushing section 20402 adjacent to the second feed port 208 is composed of first inclined pushing plates 20402a arranged along a spiral line. The first spiral conveying structure 204 is located in the outer material channel 20101.

[0112] The second spiral conveying structure 205 includes:

[0113] A second continuous spiral conveying section 20501 adjacent to the second feed port 208;

[0114] The second intermittent pushing section 20502 adjacent to the preheated material outlet 209 is composed of second inclined pushing plates 20502a arranged along a spiral line. The second spiral conveying structure 205 is located in the inner material channel 20101.

[0115] In this embodiment, the continuous spiral conveying section is composed of continuous spiral blades. The continuous spiral conveying section at the feed inlet is used to enhance the material conveying capacity. When the material passes through the push plate area, it loses the constraint of the continuous blades and is fully dispersed under the action of gravity. The centrifugal force generated by the rotation of the tube body throws the material toward the outer wall of the channel; when the material rises to a certain height (about 60°-90°) along the tube wall, gravity overcomes the centrifugal force and the material falls freely; the intermittent push plate area forms a material waterfall and the particles are fully dispersed. A "throwing-falling" cycle is formed. As a specific example, a gap of 0.5-1mm is maintained between the push plate and the outer tube wall.

[0116] As a preferred embodiment of this embodiment, the pusher plates of the intermittent pushing section (20402, 20502) are arranged in multiple rows around the periphery, with radially extending airflow channels 20403 formed between adjacent rows. Exhaust gas at a predetermined temperature radiates heat radially from the inner core tube (heating chamber). As the material tumbles, airflow channels are formed between the pusher plates, allowing the hot gas to penetrate the material layer. The particle surface continuously updates its contact interface with the hot gas. As heat from the heating chamber radiates radially, the inner and outer material channels sequentially pass through a medium-temperature heating section (300-400°C) and a low-temperature heating section (200-250°C), forming a gradient heating path.

[0117] Example 2, as an embodiment of the present invention, specifically describes an embodiment of the water-cooled horizontal tube blanking system 4. Figure 4-8 shown.

[0118] Water-cooled horizontal tube blanking system, such as Figure 4 As shown, it includes an elbow pipe 401 connected to the material outlet flange at the top of the expansion furnace 1, and the elbow pipe 401 has a material channel with a 90° bend; the reason for using a 90° bend in the material channel is that the expansion furnace is placed vertically, and the material guide pipe 402 is placed horizontally, so a 90° elbow pipe 401 is required to convert the vertical angle into a horizontal angle; the material flow flows rapidly upward under the action of the combustion-supporting air at the bottom of the expansion furnace and passes through the elbow pipe 401.

[0119] Recirculating cooling modules, such as Figure 4-8 As shown, it includes a cylindrical water tank 403 mounted on the outside of the elbow pipe 401. The sidewalls and bottom of the water tank 403 are respectively provided with mounting interfaces 40303 that seal with the ends of the elbow pipe 401. The water tank is connected to a cooling water circulation system. The water tank 403 is a cylindrical shell with both ends closed. The cylindrical shell is placed vertically, and a cooling water inlet 40301 and a cooling water outlet 40302 are respectively provided at the top of the cylindrical shell. The cooling water inlet 40301 and the cooling water outlet 40302 are connected to the cooling water circulation system, which circulates cooling water to the water tank 403 to cool the elbow pipe 401 inside the water tank 403. The expanded perlite material is in a molten state before entering elbow pipe 401. Because the material channel within elbow pipe 401 is cooled by cooling water, the temperature of the molten material flow drops from a high temperature of 900-1050°C to a medium temperature of 680-780°C upon entering the elbow pipe, transforming the material from a molten state into a granular state. This cooling prevents the high-speed molten material from adhering to the curved portion of elbow pipe 401 and causing material accumulation. The cooling water circulation system comprises a circulation pipeline, a circulation pump, and a cooling unit. This is conventional technology and will not be described in detail here.

[0120] Waste heat recovery components, such as Figure 4 As shown, it includes a horizontally arranged material guide pipe 402, one end of which is connected to the material outlet of the elbow pipe 401, and the other end is connected to the heating chamber of the preheating furnace;

[0121] Feeding device, such as Figure 5As shown, the system includes a hopper 404 disposed at the bottom of a guide pipe 402. A drop opening 40201 is defined at the bottom of the guide pipe 402, which is positioned within the drop opening 40201. The drop opening 40201 is located at the bottom of the guide pipe 402. A portion of the heavier material particles falls from the drop opening 40401 into the drop opening 40404 and are transported to the finished product silo. The remaining lighter material and dusty, medium-temperature (680-780°C) exhaust gas enters the heating chamber of the preheating furnace under the influence of the system's induced draft, heating the heating chamber. The material flow then passes through a cyclone separator, separating the exhaust gas, and the remaining material enters the finished product silo. Dust-laden exhaust gas enters a multi-tube dust collector for pressure reduction, cooling, and dust collection. After pressure reduction and cooling, the exhaust gas enters a pulse bag filter for secondary filtration, further removing dust from the exhaust gas. The treated exhaust gas is discharged through a chimney to meet standards. Finished products are packaged through a receiving port at the bottom of the silo for storage or external distribution. The guide pipe and elbow are both made of thermally conductive materials, such as aluminum and stainless steel.

[0122] As an example of this embodiment, Figure 4-8 As shown, the waste heat recovery assembly also includes a combustion air preheating box 405 mounted in the middle of the material guide pipe 402. The box 405 is provided with an air inlet 40501 and a preheated air outlet 40502 connected to the combustion air blower. The preheating box is wrapped around the outside of the material guide pipe, allowing the material guide pipe 402 to heat the air entering the preheating box 405. Under the action of the combustion air blower, the air in the preheating box 405 enters through the air inlet 40501 and is heated before being discharged through the air outlet 40502. This preheating box 405 recycles the waste heat of the material flow discharged from the top of the expansion furnace to heat the combustion air for the burners at the bottom of the expansion furnace, thereby increasing the combustion efficiency of the combustion air and further saving energy.

[0123] As an example of this embodiment, Figure 4 As shown, the guide pipe 402 is provided with a thermocouple connection interface 40202 in the pipe section near the water tank 403. This thermocouple connection interface 40202 is used to install a thermocouple. The thermocouple is sealed and connected to this connection interface. The thermocouple is used to detect the temperature of the material flow flowing out of the elbow pipe 401, facilitating material temperature monitoring. Based on the temperature detected by the thermocouple, the cooling water temperature and cooling water circulation rate in the water tank 403 are adjusted. The cooling water temperature and flow rate in the water tank 403 are also adjusted according to the preheating requirements of the flame retardant air and the preheating furnace.

[0124] As an example of this embodiment, Figure 4 、 5As shown in Figure 6, the combustion air preheating box 405 includes: a box body with an arc-shaped inner wall, the arc is a preferred arc setting, the material guide tube 402 is circular, the box body is placed on the upper part of the material guide tube 402 and its inner arc surface is attached to the outer circular surface of the material guide tube 402; the interior of the box body constitutes a closed cooling cavity, and the air inlet 40501 and the air outlet 40502 are connected to the cavity.

[0125] The material drop opening 40201 is arranged at the bottom of the material guide tube 402 below the bellows 405 , and an arcuate notch 40401 is provided on the upper end surface of the material drop hopper 404 , which fits on the arcuate surface of the bottom of the material guide tube 402 not covered by the bellows 405 .

[0126] In this embodiment, Figure 4 and 5 As shown, the combustion-supporting preheating windbox 405 and the drop hopper 404 are installed in the same section of the guide tube 402, increasing the compactness of the structure and reducing the length of the guide tube 402. In this embodiment, the windbox 405 is generally curved at an angle greater than 180°, with a notch at the bottom that exposes a portion of the circular guide tube 402, which is used to set the drop opening 40201 and install the drop hopper 404. The drop hopper 404 is generally a conical bucket with a larger top and a smaller bottom, and has a transparent drop channel. As the material flow passes through the guide tube 402, some of its heat is absorbed by the air within the windbox 405, which is used to preheat the combustion-supporting air for the bottom burner of the expansion furnace 1. Heavier materials fall through the drop opening 40201, while lighter materials and hot air containing dust enter the linear heating chamber of the preheating furnace, preheating the raw ore in the preheating furnace.

[0127] As an example of this embodiment, Figure 8 As shown, the inner diameter of the middle section of the material channel within the guide tube 402 is larger than that of the left and right sections. This larger inner diameter of the material channel within the middle section gradually decreases towards the ends until it connects with the material channels at the left and right ends. The bellows 405 and drop hopper 404 are located within the middle section 40202 of the larger inner diameter of the guide tube, allowing more finished material to fall through the drop opening 40201. This reduces the pressure of the system's induced draft system, which draws material from the preheating furnace into the cyclone separator.

[0128] Example 3, as an embodiment of the present invention, specifically describes an embodiment of the multi-port micro powder centralized collection system 11. Figure 15 shown.

[0129] The multi-port micro powder centralized collection system 11 comprises:

[0130] The spiral conveying dragon 1101, the discharge ports of the first bag dust collector 8 and the second bag dust collector 9 are respectively connected to the conveying cavity of the spiral conveying dragon 1101;

[0131] The air lock 1102 in the conveying cavity of the multi-tube dust collector 7 and the spiral conveying auger 1101 is connected to the air lock 1102 connected to the discharge port of the spiral conveying auger 1101.

[0132] Preferably, two discharge ports are provided on the spiral conveying auger 1101, one of which is connected to the secondary silo through a chain elevator. At this time, when secondary processing is required, the discharge port can be opened to lift the material to the secondary silo. When secondary processing is not required, the discharge port connected to the secondary silo is closed and the other discharge port is opened for collection.

[0133] When the multi-tube dust collector 7 and the first and second bag dust collectors are far apart and have a height difference, multiple groups of spiral conveying augers can be set up and connected in sequence, and the higher conveying augers are connected to the lower conveying augers adjacent to them through air locks.

[0134] In this invention, an air lock 1102 is installed, ensuring a closed process. This prevents external air from being drawn back into the negative pressure dust removal system, thus preventing negative pressure imbalance in the system. The impeller chambers alternately receive dust and rotate it to the discharge port, achieving dynamic, sealed dust transfer, replacing intermittent dust discharge valves and ensuring continuous production line operation. Furthermore, this eliminates disturbances in the gas-solid two-phase flow during dust transfer, achieving zero fugitive emissions from the centralized micropowder collection system.

[0135] The exhaust gas after dust removal by the dust removal system is discharged through the chimney under the induced draft of the system fan.

[0136] Example 4, as an embodiment of the present invention, the production line further includes a finished product feeding system 12, which includes a first feeding pipe 1201 and a second feeding pipe 1202. The pipe wall opening of the first feeding pipe 1201 is connected to the discharge port of the cyclone separator 6, and the pipe wall opening of the second feeding pipe 1202 is connected to the discharge port of the hopper 404 through the drop pipe;

[0137] One end of the first feeding pipe 1201 and the second feeding pipe 1202 are both located in the finished product silo 5 as the discharge port end;

[0138] The other ends of the first feeding pipe 1201 and the second feeding pipe 1202 are respectively connected to a feeding fan 1203, and the air outlet of the feeding fan 1203 is connected to a venturi tube 1204 whose opening gradually shrinks toward the far end. The air outlet of the venturi tube 1204 forms a negative pressure at the outlet of the first and second feeding pipes, and the auxiliary materials are sucked into the first and second feeding pipes.

[0139] The first and second feed pipes 1201 and 1202 each create a negative pressure at the discharge end through the tapered nozzles of a Venturi tube 1204. This not only prevents the feed fan's positive airflow from blowing into the discharge pipe, but also helps accelerate the material out of the discharge pipe and into the finished product bin. Pneumatic conveying not only simplifies the structure and reduces costs, but also reduces mechanical impact and damage to the expanded perlite.

Claims

1. An energy-saving gas-fired perlite expansion furnace equipment production line, characterized in that: The invention comprises an expansion furnace (1) and a double-circulation perlite ore preheating system (2), wherein an energy-saving burner (3) is installed at the bottom of the expansion furnace (1), and the energy-saving burner (3) is connected to a combustion-supporting blower (301), and further comprises: A water-cooled horizontal tube blanking system (4) installed on the top of the expansion furnace (1) comprises: a) an elbow pipe (401), which is connected to the material outlet at the top of the expansion furnace (1), and the elbow pipe (401) has a material channel bent at a certain angle; b) a circulating cooling module, comprising a water tank (403) sleeved on the outside of the elbow pipe (401), the side walls and bottom of the water tank (403) respectively provided with mounting interfaces (40303) that seal with both ends of the elbow pipe (401), and the water tank (403) is connected to a cooling water circulation system; c) a waste heat recovery component, comprising a horizontally arranged material guide pipe (402), one end of the material guide pipe (402) being connected to the discharge port of the elbow pipe (401), and the other end being connected to a heating chamber (20301) formed by an inner core pipe (203) of a double-circulation perlite ore preheating system (2); d) a material distribution device, comprising a drop hopper (404) arranged at the bottom of the guide tube (402), a drop opening (40201) disposed in the drop hopper (404) is opened at the bottom of the guide tube (402), and the drop hopper (404) is connected to the finished product bin (5); e) the waste heat recovery assembly further comprises a combustion air preheating wind box (405) sleeved on the middle section of the material guide pipe (402), the wind box (405) being provided with an air inlet (40501) and a preheated air outlet (40502) communicating with the combustion air blower (301); The perlite material enters the double-circulation perlite ore preheating system (2) for preheating and then enters the expansion furnace (1). The expanded perlite material flows into the water-cooled horizontal tube blanking system (4). A portion of the material flows from the blanking hopper (404) into the finished product bin (5) due to its own weight, and the other portion of the material flows into the inner core tube (203) of the double-circulation perlite ore preheating system (2) to form a preheating source. It also includes a cyclone separator (6) for receiving the material flow in the inner core tube (203), and the finished material is sent to the finished product silo (5) under the action of centrifugal force, and the tail gas containing dust passes through the multi-tube dust collector (7) and then enters the first bag dust collector (8); A second bag dust collector (9) connected to the top of the finished product silo (5); Two system fans (10) are respectively connected to the outlets of the first bag dust collector (8) and the second bag dust collector (9).

2. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 1 is characterized in that: The production line also includes a multi-port micro powder centralized collection system (11), which includes: A spiral conveying auger (1101), wherein the discharge ports of the first bag dust collector (8) and the second bag dust collector (9) are respectively connected to the conveying cavity of the spiral conveying auger (1101); An air lock (1102) is connected between the multi-tube dust collector (7) and the conveying cavity of the spiral conveying auger (1101) and on the discharge port of the spiral conveying auger (1101).

3. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 1 is characterized in that: The production line also includes a finished product feeding system (12), comprising a first feeding pipe (1201) and a second feeding pipe (1202), wherein the opening of the pipe wall of the first feeding pipe (1201) is connected to the discharge port of the cyclone separator (6), and the opening of the pipe wall of the second feeding pipe (1202) is connected to the discharge port of the drop hopper (404); One end of the first feeding pipe (1201) and the second feeding pipe (1202) are both located in the finished product bin (5) as discharge ports; The other ends of the first feeding pipe (1201) and the second feeding pipe (1202) are respectively connected to a feeding fan (1203), and the air outlet of the feeding fan (1203) is connected to a venturi tube (1204) whose opening gradually narrows toward the distal end. The air outlet of the venturi tube (1204) forms a negative pressure at the outlet of the first and second feeding pipes, thereby auxiliary materials are sucked into the first and second feeding pipes.

4. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 1, characterized in that: The double-circulation pearlite ore preheating system (2) comprises: A coaxially nested three-layer tube structure: from outside to inside, it is an outer tube (201), a middle tube (202) and an inner core tube (203); Double circulation material channel: a) an outer material channel (20101) is formed between the outer tube (201) and the middle tube (202), and a first spiral conveying structure (204) is provided on the inner wall of the outer material channel (20101); b) an inner material channel (20201) is formed between the middle tube (202) and the inner core tube (203), and a second spiral conveying structure (205) is provided on the inner wall of the inner material channel; Rotation drive unit: a turning drive mechanism (206) connected to the outer tube (201), used to drive the tube body to rotate around the axis; Feed assembly: a hopper assembly (207) provided at the first axial end of the outer tube (201), comprising a plurality of circumferentially distributed digging hoppers (20701) and a first feed port (20702) connected thereto, wherein the first feed port (20702) leads to the outer material channel (20101); Material diverting interface: a second feed port (208) provided at the second axial end of the middle tube (202), used for directing the material output from the outer material channel (20101) into the inner material channel (20201); Preheating material outlet (209): extending to the end opening of the middle tube (202) outside the first axial end of the outer tube (201); Heating chamber (20301): composed of the inner cavity of the inner core tube (203); Reverse conveying structure: The rotation direction of the first spiral conveying structure (204) is opposite to that of the second spiral conveying structure (205), so that the material is conveyed from the first end to the second end in the outer material channel (20101) and from the second end to the first end in the inner material channel (201).

5. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 4 is characterized in that: The first spiral conveying structure (204) comprises: a first continuous spiral conveying section (20401) adjacent to the first feed inlet (702); The first intermittent pushing section (20402) adjacent to the second feed port (208) is composed of a first inclined pushing plate (20402a) arranged along a spiral line.

6. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 4, characterized in that: The second spiral conveying structure (205) comprises: a second continuous spiral conveying section (20501) adjacent to the second feed port (208); The second intermittent pushing section (20502) adjacent to the preheating material outlet (209) is composed of a second inclined pushing plate (20502a) arranged along a spiral line.

7. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 4 is characterized in that: The first spiral conveying structure (204) is fixed on the inner side wall of the outer tube (201) and is located in the outer material channel (20101); the second spiral conveying structure (205) is fixed on the inner side wall of the middle tube (202) and is located in the inner material channel (20201).

8. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 4 is characterized in that: The production line also includes a preheating feed shell (210), an annular feed chamber (211) is formed in the preheating feed shell (210), and multiple hoppers (701) are fitted in the annular feed chamber (211). The upper end of the annular feed chamber (211) is connected to a feed elevator (212), and the lower part of the feed elevator (212) receives materials and lifts the materials to transport them to the annular feed chamber (211).

9. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 1, characterized in that: The system fan (10) is connected to the chimney (13).

10. The energy-saving gas-fired perlite expansion furnace equipment production line according to claim 4, characterized in that: The preheated material output from the preheating material outlet (209) passes through the buffer bin and the distribution hopper device (14) and enters the expansion furnace (1).

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