Apparatus and process for lithium spodumene transformation roasting, waste heat recovery and tail gas treatment

Abstract

The present disclosure relates to an apparatus and process for lithium aluminosilicate transformation roasting, waste heat recovery and tail gas treatment, and relates to the technical field of lithium aluminosilicate transformation. The transformation unit in the apparatus comprises a heating assembly, a transformation assembly and a transformation material gas-solid separator; the transformation material gas-solid separator comprises a transformation material inlet, a solid outlet and a gas outlet; the heating assembly comprises a connected temperature rising furnace and a first air supply assembly; the transformation assembly comprises a connected transformation furnace and a second air supply assembly; the first outlet of the temperature rising furnace is connected with the second inlet of the transformation furnace, and the first outlet of the transformation furnace is connected with the transformation material inlet; the temperature rising furnace and the transformation furnace are both vertical furnaces; the first inlet of the heat exchange unit is connected with the feeding unit, and the second inlet of the heat exchange unit is connected with the gas outlet; the first outlet of the heat exchange unit is connected with the second inlet of the temperature rising furnace, the second outlet of the heat exchange unit is connected with the flue gas treatment unit, and the solid outlet is used for making the transformed material enter the subsequent process.

Description

Technical Field

[0001] This disclosure relates to the field of spodumene conversion technology, and more specifically, to an apparatus and process for spodumene conversion roasting, waste heat recovery and tail gas treatment. Background Technology

[0002] Existing spodumene roasting processes mainly include rotary kilns and hollow kilns. However, both roasting processes suffer from problems such as material sintering, difficulty in material heat recovery, and low flue gas heat recovery rate.

[0003] The main cooling methods used in the material discharge box of the rotary kiln head are water cooling equipment and air cooling machines. Water cooling generally uses an external water spray process, but the cooled water cannot recover heat, and the water consumption is relatively large. In air cooling equipment, only a portion of the energy can be recovered from the flue gas after the material is cooled, but as the power of the air cooling equipment increases, the amount of unrecovered heat will increase significantly.

[0004] Both rotary kiln and hollow kiln processes have high overall energy consumption due to the excessive length of the kiln body and the need for constant rotational heating. In addition, the use of burners for heating in the excessively long kiln body leads to unstable temperatures in the high-temperature section of the kiln, causing sintering of materials in the high-temperature transition section.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide an apparatus and process for spodumene conversion roasting, waste heat recovery and tail gas treatment. A vertical furnace is used to exchange heat between the material and hot air in a suspended state to realize the conversion of the material; the hot flue gas generated during the conversion exchanges heat with the material before conversion to realize the recovery of the conversion heat.

[0007] According to one aspect of this disclosure, an apparatus for spodumene conversion roasting, waste heat recovery and tail gas treatment is provided, the apparatus comprising a feeding unit, a heat exchange unit, a conversion unit and a flue gas treatment unit.

[0008] The transformation unit includes a heating component, a transformation component, and a gas-solid separator for the transformation material.

[0009] The transition material gas-solid separator includes a transition material inlet, a solid outlet, and a gas outlet; the heating assembly includes a heating furnace and a first air supply assembly, the first air supply assembly being connected to a first inlet of the heating furnace; the transition assembly includes a transition furnace and a second air supply assembly, the second air supply assembly being connected to a first inlet of the transition furnace; the first outlet of the heating furnace is connected to a second inlet of the transition furnace, and the first outlet of the transition furnace is connected to the transition material inlet of the transition material gas-solid separator;

[0010] Both the heating furnace and the conversion furnace are vertical furnaces;

[0011] The first inlet of the heat exchange unit is connected to the feeding unit, so that the material conveyed by the feeding unit enters the heat exchange unit; the second inlet of the heat exchange unit is connected to the gas outlet of the conversion material gas-solid separator, so as to receive the hot flue gas discharged from the conversion furnace.

[0012] The first outlet of the heat exchange unit is connected to the second inlet of the heating furnace, so that the material after heat exchange can enter the heating furnace; the second outlet of the heat exchange unit is connected to the flue gas treatment unit, so that the flue gas after heat exchange can enter the flue gas treatment unit for treatment.

[0013] The solid outlet of the gas-solid separator for the transformed material is used to allow the transformed material to enter the subsequent process.

[0014] In one exemplary embodiment of this disclosure, the heat exchange unit includes N stages of heat exchange components, where N = 1;

[0015] The heat exchange assembly includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve; the heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a material outlet.

[0016] The first end of the heat exchange duct is connected to both the feeding unit and the gas outlet of the transition material gas-solid separator. The second end of the heat exchange duct is connected to the mixing inlet of the heat exchange gas-solid separator. The air outlet of the heat exchange gas-solid separator is connected to the flue gas treatment unit. The discharge outlet of the heat exchange gas-solid separator is connected to the inlet of the counterweight airlock valve. The outlet of the counterweight airlock valve is connected to the second inlet of the heating furnace.

[0017] In one exemplary embodiment of this disclosure, the heat exchange unit includes N cascaded heat exchange components, where N≥2;

[0018] Each heat exchange component includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve; the heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a material outlet.

[0019] The first end of the heat exchange duct of the first-stage heat exchange component is connected to the feeding unit; the air outlet of the heat exchange gas-solid separator of the first-stage heat exchange component is connected to the flue gas treatment unit.

[0020] The first end of the heat exchange duct of the Nth stage heat exchange component is connected to the gas outlet of the gas-solid separator of the transition material; the outlet of the counterweight airlock valve of the Nth stage heat exchange component is connected to the second inlet of the heating furnace.

[0021] In adjacent heat exchanger stages, the first end of the heat exchange duct of the Kth stage heat exchanger is connected to the outlet of the heat exchange gas-solid separator of the (K+1)th stage heat exchanger, and the outlet of the counterweight airlock valve of the Kth stage heat exchanger is connected to the first end of the heat exchange duct of the (K+1)th stage heat exchanger. <N;

[0022] The second end of the heat exchange air duct of each heat exchange component is connected to the mixing inlet of the corresponding heat exchange gas-solid separator, and the outlet of each heat exchange gas-solid separator is connected to the inlet of the corresponding counterweight airlock valve.

[0023] In one exemplary embodiment of this disclosure, the heat exchange unit includes four cascaded heat exchange components.

[0024] In one exemplary embodiment of this disclosure, both the second inlet and the first inlet of the heating furnace are located at the lower part of the heating furnace, and the second inlet of the heating furnace is located at a higher position than the first inlet of the heating furnace.

[0025] The conversion furnace is located above the heating furnace, the first outlet of the heating furnace is located at the upper end of the heating furnace, and the second inlet of the conversion furnace is located at the lower end of the conversion furnace.

[0026] In one exemplary embodiment of this disclosure, a material cooling unit for the transformation process is also included;

[0027] The transition material cooling unit includes a waste heat recovery boiler and a silo-type pneumatic pump connected in sequence; the waste heat recovery boiler is connected to the solid outlet of the transition material gas-solid separator.

[0028] The waste heat recovery boiler includes an inner furnace layer and an outer furnace layer, with an annular cavity formed between the inner furnace layer and the outer furnace layer;

[0029] The annular cavity has a water inlet, a water outlet, and a gas outlet; the water inlet is located at the lower part of the outer furnace layer, and the water outlet and the gas outlet are both located at the upper part of the outer furnace layer. The position of the gas outlet is higher than that of the water outlet, so as to allow the transformation material in the inner furnace layer to exchange heat with the water in the annular cavity and generate water vapor.

[0030] The chamber-type pneumatic pump is used to further exchange heat between compressed air and the heat-exchanged transition material.

[0031] In one exemplary embodiment of this disclosure, the flue gas treatment unit includes a dust collector, a diversion tee, a flue gas regulating valve group, a flow control tee, and a flue gas purification component;

[0032] The first inlet of the dust collector is connected to the second outlet of the heat exchange unit;

[0033] The first through hole of the diversion tee is connected to the first through hole of the flow control tee, and the second through hole of the diversion tee is connected to the flue gas purification component; the third through hole of the diversion tee is connected to the first outlet of the dust collector, and the first outlet of the dust collector is used to discharge the flue gas after dust removal.

[0034] The second through hole of the flow control tee is connected to the first air supply component, and the third through hole of the flow control tee is connected to the second air supply component;

[0035] The flue gas regulating valve group includes a first flue gas regulating valve, a second flue gas regulating valve, a third flue gas regulating valve and a fourth flue gas regulating valve;

[0036] The first flue gas regulating valve is disposed between the second through hole of the diversion tee and the flue gas purification component; the second flue gas regulating valve is disposed between the first through hole of the diversion tee and the first through hole of the flow control tee, for the purpose of diverting the flue gas after heat exchange according to the demand of the heating furnace and the conversion furnace.

[0037] The third flue gas regulating valve is disposed between the third through hole of the flow control tee and the second air supply component; the fourth flue gas regulating valve is disposed between the second through hole of the flow control tee and the first air supply component.

[0038] In one exemplary embodiment of this disclosure, the second outlet of the dust collector is connected to the heat exchange unit, so that the solid material in the dust collector enters the heat exchange unit for recycling.

[0039] The dust collector is a high-temperature filter bag dust collector, and a flue gas exhaust fan is installed between the high-temperature filter bag dust collector and the third through hole of the diversion tee pipe.

[0040] The flue gas purification assembly includes a denitrification device, a flue gas heat exchange device, a desulfurization device, and an electrostatic demister connected in sequence.

[0041] The denitrification device is connected to the second through hole of the diversion tee.

[0042] In an exemplary embodiment of this disclosure, the first air supply assembly includes a primary air blower for the heating furnace, a burner for the heating furnace, and a hot air furnace for the heating furnace, which are connected in sequence; the air inlet of the hot air furnace for the heating furnace is connected to the second through hole of the flow control tee, and the air outlet of the hot air furnace for the heating furnace is connected to the first inlet of the heating furnace.

[0043] The second air supply assembly includes a primary air blower for the conversion furnace, a burner for the conversion furnace, and a hot blast stove for the conversion furnace, which are connected in sequence. The air inlet of the hot blast stove for the conversion furnace is connected to the third through hole of the flow control tee, and the air outlet of the hot blast stove for the conversion furnace is connected to the first inlet of the conversion furnace.

[0044] The feeding unit includes a raw material feeding hopper, a quantitative feeder, an airlock feeder, and a static dispersing device connected in sequence; the static dispersing device is connected to the first inlet of the heat exchange unit.

[0045] According to another aspect of this disclosure, a process for spodumene conversion roasting, waste heat recovery, and tail gas treatment is also provided, employing the aforementioned apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment, comprising:

[0046] S10. Start the first and second air supply components of the transformation unit and start the feeding unit;

[0047] S20. The hot flue gas separated by the gas-solid separator for the transition material enters the heat exchange unit through the gas outlet of the gas-solid separator for heat exchange with the material conveyed by the feeding unit.

[0048] S30. The material after heat exchange enters the heating furnace. Under the heating of the first air supply component, the material after heat exchange is further heated to the preset temperature in a suspended state. The hot flue gas after heat exchange is discharged to the flue gas treatment unit through the second outlet of the heat exchange unit.

[0049] S40. The heated material is suspended and rises into the conversion furnace. Under the heating of the second air supply component, the material is converted and suspended and rises. It enters the conversion material gas-solid separator through the conversion material inlet for gas-solid separation.

[0050] S50. The solid material separated by the transition material gas-solid separator enters the subsequent process through the solid outlet of the transition material gas-solid separator; the hot flue gas separated by the transition material gas-solid separator enters the heat exchange unit through the gas outlet of the transition material gas-solid separator.

[0051] Both the heating furnace and the conversion furnace in this disclosure are vertical furnaces. Hot air is introduced into the vertical furnace through the air supply assembly, so that the material is in a suspended state in both the heating furnace and the conversion furnace. This increases the heat exchange area between the material and the hot air, improves the heating efficiency of the material, reduces the heating and conversion time of the material, and improves the uniformity of the material heating, avoiding the overheating problem caused by excessively high local temperatures.

[0052] In the solution provided in this disclosure, the heat exchange unit is connected to the gas outlet of the gas-solid separator for the conversion material to receive the hot flue gas discharged from the conversion furnace. This serves two purposes: firstly, it preheats the material entering the heat exchange unit, improving heat recovery from the high-temperature flue gas; secondly, the heat exchange unit reduces the temperature of the flue gas after exchanging heat between the material and the hot flue gas, thereby reducing the temperature and pressure on the flue gas treatment unit and optimizing the waste gas treatment process.

[0053] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0054] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0055] Figure 1 This is a schematic diagram of an apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment in one embodiment of the present disclosure.

[0056] Figure 2 This is a schematic diagram of an apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment in one embodiment of the present disclosure.

[0057] Figure 3 This is a schematic diagram of a process flow for spodumene conversion roasting, waste heat recovery and tail gas treatment in one embodiment of the present disclosure.

[0058] The attached figures are labeled as follows:

[0059] 1-1. Raw material feed silo; 1-2. Quantitative feeder; 1-3. Airlock feeder; 1-4. Static dispersing device; 2-1. Primary heat exchange air duct; 2-2. Primary heat exchange gas-solid separator; 2-3. Primary counterweight airlock valve; 2-4. Secondary heat exchange air duct; 2-5. Secondary heat exchange gas-solid separator; 2-6. Secondary counterweight airlock valve; 2-7. Tertiary heat exchange air duct; 2-8. Tertiary heat exchange gas-solid separator; 2-9. Tertiary counterweight airlock valve; 2-10. Quaternary heat exchange air duct; 2-11. Quaternary heat exchange gas-solid separator; 2-12. Quaternary counterweight airlock valve; 3-1. Heating furnace; 3-2. Conversion furnace; 3-3. Conversion furnace outlet duct; 3-4. Conversion material gas-solid separator; 3-5. Conversion material counterweight airlock valve; 3 -6. Hot air furnace for heating furnace; 3-7. Burner for heating furnace; 3-8. Primary air fan for heating furnace; 3-9. Hot air furnace for conversion furnace; 3-10. Burner for conversion furnace; 3-11. Primary air fan for conversion furnace; 4-1. Dust collector; 4-2. Flue gas exhaust fan; 4-3. First flue gas regulating valve; 4-4. Second flue gas regulating valve; 4-5. Third flue gas regulating valve; 4-6. Fourth flue gas regulating valve; 4-7. Return material control valve; 4-8. Return material conveying device; 4-9. Return material silo; 4-10. Return material silo pump; 4-11. Feed silo; 4-12. Denitrification device; 4-13. Flue gas heat exchange device; 4-14. Desulfurization device; 4-15. Electrostatic demister device; 5-1. Waste heat recovery boiler; 5-2. Silo-type pneumatic pump. Detailed Implementation

[0060] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0061] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.

[0062] The terms “a,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.

[0063] This disclosure provides an apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment, such as... Figure 1 and Figure 2 As shown, the device includes a feeding unit, a heat exchange unit, a transformation unit, and a flue gas treatment unit. The transformation unit is used to achieve the transformation roasting of spodumene. The transformation unit includes a heating component, a transformation component, and a transformation material gas-solid separator 3-4. The heating component is used to heat the material to a higher temperature, and the transformation component is used to heat and transform the material. The transformation material gas-solid separator 3-4 includes a transformation material inlet, a solid outlet, and a gas outlet.

[0064] The heating assembly includes a heating furnace 3-1 and a first air supply assembly, the first air supply assembly being connected to the first inlet of the heating furnace 3-1; the transformation assembly includes a transformation furnace 3-2 and a second air supply assembly, the second air supply assembly being connected to the first inlet of the transformation furnace 3-2. In this embodiment, both the heating furnace 3-1 and the transformation furnace 3-2 are vertical furnaces. The transformation furnace 3-2 can be positioned above the heating furnace 3-1. The first outlet of the heating furnace 3-1 is connected to the second inlet of the transformation furnace 3-2, allowing the heated material in the heating furnace 3-1 to enter the transformation furnace 3-2 through the first outlet of the heating furnace 3-1 and the second inlet of the transformation furnace 3-2. The first outlet of the transformation furnace 3-2 can be connected to the transformation material inlet of the transformation material gas-solid separator 3-4 via the transformation furnace exhaust pipe 3-3, allowing the transformed material and hot flue gas mixture in the transformation furnace 3-2 to enter the transformation material gas-solid separator 3-4 for gas-solid separation. The hot flue gas generated by gas-solid separation is output from the gas outlet of the transition material gas-solid separator 3-4, and the transition solid material generated by gas-solid separation is output from the solid outlet of the transition material gas-solid separator 3-4.

[0065] The first inlet of the heat exchange unit is connected to the feeding unit, allowing the material conveyed by the feeding unit to enter the heat exchange unit. The second inlet of the heat exchange unit is connected to the gas outlet of the conversion material gas-solid separator 3-4, for receiving the hot flue gas discharged from the conversion furnace 3-2. The first outlet of the heat exchange unit is connected to the second inlet of the heating furnace 3-1, allowing the heat-exchanged material to enter the heating furnace 3-1. The second outlet of the heat exchange unit is connected to the flue gas treatment unit, allowing the heat-exchanged flue gas to enter the flue gas treatment unit for treatment. The solid outlet of the conversion material gas-solid separator 3-4 allows the converted material to enter the subsequent process.

[0066] This embodiment employs a vertical furnace to heat and transform spodumene. Hot air is conveyed to the vertical heating furnace 3-1 and the vertical transformation furnace 3-2 via a first and second air supply assembly. This causes the material to be suspended in the vertical furnace, increasing the heat exchange area between the material and the hot air, improving the heat transfer rate, enhancing the heating efficiency, and reducing the heating and transformation time. Simultaneously, the uniformity of material heating is improved, avoiding overheating caused by localized excessive temperatures. The heat exchange unit receives the hot flue gas discharged from the transformation furnace 3-2. On one hand, this can be used to preheat the material entering the heat exchange unit, improving the recovery of heat from the high-temperature flue gas. On the other hand, after exchanging heat between the material and the hot flue gas, the temperature of the flue gas is reduced before being discharged to the flue gas treatment unit, reducing the temperature pressure of the flue gas treated by the unit, lowering the high-temperature resistance requirements of the materials used in the flue gas treatment unit, and optimizing the waste gas treatment process.

[0067] In one embodiment of this disclosure, the heat exchange unit may include one or more stages of heat exchange components.

[0068] In one example, the heat exchange unit includes a primary heat exchange assembly. This assembly includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve. The heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a discharge outlet. The first end of the heat exchange duct is connected to both the feeding unit and the gas outlet of the transition material gas-solid separator 3-4, allowing the material from the feeding unit and the hot flue gas discharged from the gas outlet of the transition material gas-solid separator 3-4 to enter from the first end of the heat exchange duct and undergo heat exchange. The second end of the heat exchange duct is connected to the mixing inlet of the heat exchange gas-solid separator, allowing the heat-exchanged mixture of material and flue gas to enter the separator for gas-solid separation. The air outlet of the heat exchange gas-solid separator is connected to the flue gas treatment unit, the discharge outlet is connected to the inlet of the counterweight airlock valve, and the outlet of the counterweight airlock valve is connected to the second inlet of the heating furnace 3-1. In other words, the flue gas separated after gas-solid separation enters the flue gas treatment unit for treatment, while the separated solid material enters the heating furnace 3-1 through the counterweight airlock valve and the second inlet of the heating furnace 3-1. Thus, through heat exchange between the material and the hot flue gas in the heat exchange duct, heat from the high-temperature flue gas after conversion can be recovered and utilized, and the material before conversion can be preheated, increasing the temperature of the material entering the heating furnace 3-1. This allows the material in the heating furnace 3-1 to quickly reach the preset temperature, saving heating fuel. Simultaneously, heat exchange within the heat exchange components can also evaporate moisture from the material, pre-drying it and preventing adhesion in the vertical heating furnace 3-1, which would affect the suspension heat exchange effect.

[0069] In one example, the heat exchange unit comprises N cascaded heat exchange components, for example, N being 2-6. Each heat exchange component includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve; the heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a discharge outlet. The first end of the heat exchange duct of the first-stage heat exchange component is connected to the discharge outlet of the feeding unit; the air outlet of the heat exchange gas-solid separator of the first-stage heat exchange component is connected to the flue gas treatment unit. The first end of the heat exchange duct of the Nth-stage heat exchange component is connected to the gas outlet of the transition material gas-solid separator 3-4; the outlet of the counterweight airlock valve of the Nth-stage heat exchange component is connected to the second inlet of the heating furnace 3-1. In each heat exchange component, the second end of the heat exchange duct is connected to the mixing inlet of the corresponding heat exchange gas-solid separator, and the discharge outlet of each heat exchange gas-solid separator is connected to the inlet of the corresponding counterweight airlock valve. In adjacent heat exchanger stages, the first end of the heat exchange duct of the K-th stage heat exchanger is connected to the outlet of the gas-solid separator of the (K+1)-th stage heat exchanger, and the outlet of the counterweight airlock valve of the K-th stage heat exchanger is connected to the first end of the heat exchange duct of the (K+1)-th stage heat exchanger, where K ≤ N. Thus, through gradient heat exchange of the material, preheating of the material is achieved while increasing the utilization rate of the high-temperature flue gas heat and reducing heat loss. After being cooled by heat exchange, the high-temperature flue gas is discharged from the outlet of the first-stage gas-solid separator to the flue gas treatment unit, reducing the cost of flue gas treatment.

[0070] Taking a four-stage cascaded heat exchange assembly as an example, it sequentially includes a primary heat exchange assembly, a secondary heat exchange assembly, a tertiary heat exchange assembly, and a quaternary heat exchange assembly. Specifically, the primary heat exchange assembly includes a primary heat exchange duct 2-1, a primary heat exchange gas-solid separator 2-2, and a primary counterweight airlock valve 2-3; the secondary heat exchange assembly includes a secondary heat exchange duct 2-4, a secondary heat exchange gas-solid separator 2-5, and a secondary counterweight airlock valve 2-6; the tertiary heat exchange assembly includes a tertiary heat exchange duct 2-7, a tertiary heat exchange gas-solid separator 2-8, and a tertiary counterweight airlock valve 2-9; and the quaternary heat exchange assembly includes a quaternary heat exchange duct 2-10, a quaternary heat exchange gas-solid separator 2-11, and a quaternary counterweight airlock valve 2-12.

[0071] The first end of the primary heat exchange duct 2-1 is connected to both the feed unit and the outlet of the secondary heat exchange gas-solid separator 2-5. The second end of the primary heat exchange duct 2-1 is connected to the mixing inlet of the primary heat exchange gas-solid separator 2-2. The outlet of the primary heat exchange gas-solid separator 2-2 is connected to the flue gas treatment unit. The outlet of the primary heat exchange gas-solid separator 2-2 is connected to the primary counterweight airlock valve 2-3. The primary counterweight airlock valve 2-3 is connected to the first end of the secondary heat exchange duct 2-4, allowing material to enter the secondary heat exchange assembly. The first end of the secondary heat exchange duct 2-4 is also connected to the outlet of the tertiary heat exchange gas-solid separator 2-8. The second end of the secondary heat exchange duct 2-4 is connected to the mixing inlet of the secondary heat exchange gas-solid separator 2-5. The discharge port of the secondary heat exchange gas-solid separator 2-5 is connected to the secondary counterweight airlock valve 2-6. The secondary counterweight airlock valve 2-6 is connected to the first end of the tertiary heat exchange duct 2-7, allowing material to enter the tertiary heat exchange assembly. The first end of the tertiary heat exchange duct 2-7 is also connected to the air outlet of the quaternary heat exchange gas-solid separator 2-11, and the second end of the tertiary heat exchange duct 2-7 is connected to the mixing inlet of the tertiary heat exchange gas-solid separator 2-8. The discharge port of the tertiary heat exchange gas-solid separator 2-8 is connected to the tertiary counterweight airlock valve 2-9, and the tertiary counterweight airlock valve 2-9 is connected to the first end of the quaternary heat exchange duct 2-10, allowing material to enter the quaternary heat exchange assembly. The first end of the quaternary heat exchange duct 2-10 is also connected to the gas outlet of the transition material gas-solid separator 3-4, and the second end of the quaternary heat exchange duct 2-10 is connected to the mixing inlet of the quaternary heat exchange gas-solid separator 2-11. The outlet of the four-stage heat exchanger gas-solid separator 2-11 is connected to the four-stage counterweight airlock valve 2-12, which in turn is connected to the second inlet of the heating furnace 3-1, allowing the material to enter the heating furnace 3-1. It can be understood that the flue gas temperature entering each stage of the heat exchange duct can be expressed as: four-stage heat exchange duct 2-10 > three-stage heat exchange duct 2-7 > two-stage heat exchange duct 2-4 > one-stage heat exchange duct 2-1. Thus, ambient temperature material enters the first-stage heat exchange component, where heat exchange occurs sequentially at each stage, gradually increasing the material's temperature. For example, after four stages of heat exchange, the material temperature reaches 800-900℃ before entering the heating furnace 3-1. The higher temperature of the material entering the heating furnace 3-1 makes it easier to control the air velocity of the first air supply component delivering hot air to the heating furnace 3-1. Meanwhile, since the material entering the heating furnace 3-1 has a high temperature, the fuel consumption of the first air supply component and the second air supply component can be reduced, thus saving fuel energy.

[0072] In one embodiment of this disclosure, both the second inlet and the first inlet of the heating furnace 3-1 are located at the lower part of the heating furnace 3-1, with the second inlet positioned higher than the first inlet. The solid material, after heat exchange in each stage of the heat exchange components, enters the heating furnace 3-1 through the second inlet. The first air supply component introduces generated hot air into the heating furnace 3-1 through the first inlet. This means the solid material inlet is above the hot air inlet, allowing the hot air entering the heating furnace 3-1 to carry the material upwards in a suspended manner, achieving sufficient heat exchange. The conversion furnace 3-2 is located above the heating furnace 3-1, with the first outlet of the heating furnace 3-1 located at its upper end, and the second inlet of the conversion furnace 3-2 located at its lower end. This means the heated material directly enters the conversion furnace 3-2. This avoids a temperature drop due to an excessively long transport path, thus preventing a reduction in the conversion efficiency of the spodumene material.

[0073] In one embodiment of this disclosure, the first air supply assembly includes a primary air fan 3-8, a burner 3-7, and a hot air furnace 3-6 connected in sequence. The outlet of the hot air furnace 3-6 is connected to the first inlet of the heating furnace 3-1, providing hot air to the heating furnace 3-1 to suspend the material and heat it to a preset temperature (e.g., 1050–1100°C). This preset temperature can be the material's transformation temperature. Thus, when the material reaches the transformation temperature and enters the transformation furnace 3-2, it can quickly complete the transformation under the heat provided by the second air supply assembly and exit the transformation furnace 3-2, ensuring the material's transformation rate. The second air supply assembly includes a primary air fan 3-11, a burner 3-10, and a hot blast stove 3-9 connected in sequence. The outlet of the hot blast stove 3-9 is connected to the first inlet of the transition furnace 3-2, providing hot air to the transition furnace 3-2. This keeps the material in a suspended state for heat exchange and transformation. In this suspended state, the material absorbs the heat provided by the hot blast stove 3-9 for crystal transformation, converting from α-spodumene to β-spodumene, with a transformation rate exceeding 98%. Thus, the hot blast stove provides heat to the heating furnace 3-1 and the transition furnace 3-2 in the form of hot air, resulting in a more stable heat source and more uniform temperature. This allows for suspended and dispersed heat exchange, improving the efficiency and uniformity of heat exchange and preventing sintering of the material in the transition furnace 3-2.

[0074] In one embodiment of this disclosure, the apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment further includes a conversion material cooling unit for cooling and recovering waste heat from the solid outlet of the conversion material gas-solid separator 3-4. The solid material output from the solid outlet of the conversion material gas-solid separator 3-4 can be discharged to the conversion material cooling unit via the conversion material counterweight airlock valve 3-5.

[0075] The material cooling unit includes a waste heat recovery boiler 5-1 (primary cooling) and a silo-type pneumatic pump 5-2 (secondary cooling) connected in sequence; the waste heat recovery boiler 5-1 is connected to the outlet of the material counterweight airlock valve 3-5; and the silo-type pneumatic pump 5-2 is connected to the equipment of the subsequent process.

[0076] Waste heat recovery boiler 5-1 can perform primary cooling of the converted solid materials. Waste heat recovery boiler 5-1 includes an inner furnace layer and an outer furnace layer, forming an annular cavity between them. The annular cavity has a water inlet, a water outlet, and a gas outlet; the water inlet is located at the lower part of the outer furnace layer, and the water outlet and gas outlet are located at the upper part of the outer furnace layer, with the gas outlet positioned higher than the water outlet. Soft water can be introduced into the water inlet, exchanging heat with the high-temperature solid converted materials in the inner furnace layer to generate saturated steam (e.g., 0.8 MPa, 175.4℃ steam or 0.4 MPa, 152.6℃ steam), which is discharged from the gas outlet. Unevaporated water is discharged from the water outlet, and the discharged water can be reused by re-entering the annular cavity through the water inlet. The material in the inner furnace layer, after heat exchange with the water in the annular cavity, is cooled to 150-200℃ and discharged from the outlet of waste heat recovery boiler 5-1 to the silo-type pneumatic pump 5-2. In this way, by exchanging heat between the water and the material in the annular cavity, the solid material after transformation can be cooled down, reducing the energy consumption of the material cooling process; at the same time, heat can be recovered, and the water vapor generated by the heat recovery can be connected to the factory's steam pipeline network for use.

[0077] The silo-type pneumatic pump 5-2 can perform secondary cooling on the solid materials after primary cooling. The solid materials discharged from the outlet of the waste heat recovery boiler 5-1 are transported by the silo-type pneumatic pump 5-2. During transportation, the compressed air introduced into the silo-type pneumatic pump 5-2 can be used to mix with the solid materials after transformation, further exchanging heat to reduce the temperature of the materials, which facilitates the subsequent storage and use of the transformed materials and reduces the material handling pressure of subsequent processes.

[0078] In one embodiment of this disclosure, the flue gas treatment unit includes a dust collector 4-1, a diversion tee, a flue gas regulating valve group, a flow control tee, and a flue gas purification component.

[0079] In one example, the flue gas regulating valve assembly includes a first flue gas regulating valve 4-3, a second flue gas regulating valve 4-4, a third flue gas regulating valve 4-5, and a fourth flue gas regulating valve 4-6.

[0080] The first inlet of dust collector 4-1 is connected to the outlet of the primary heat exchange gas-solid separator in the primary heat exchange assembly of the heat exchange unit, and is used to receive the heat-exchanged flue gas discharged from the outlet of the primary heat exchange gas-solid separator. The first through hole of the diversion tee is connected to the first through hole of the control tee, and the second through hole of the diversion tee is connected to the flue gas purification assembly. The first flue gas regulating valve 4-3 is located between the second through hole of the diversion tee and the flue gas purification assembly, and the second flue gas regulating valve 4-4 is located between the first through hole of the diversion tee and the first through hole of the control tee, so that the heat-exchanged flue gas is diverted to the first and second air supply assemblies of the transformation unit according to the demand of the heating furnace 3-1 and the transformation furnace 3-2. The third through hole of the diversion tee is connected to the first outlet of dust collector 4-1, and the first outlet of dust collector 4-1 is used to discharge the dust-exchanged flue gas. In other words, the third through-hole of the diversion tee receives the flue gas after dust removal, and it is diverted through the first and second through-holes of the diversion tee. The circulating flue gas flows out through the first through-hole and enters the transformation unit for recycling; the exhaust flue gas flows out through the second through-hole and enters the flue gas purification component for treatment before being discharged in compliance with standards. Furthermore, a flue gas exhaust fan 4-2 is installed between the first outlet of the dust collector 4-1 and the third through-hole of the diversion tee, so that the flue gas discharged from the first outlet of the dust collector 4-1 can quickly pass through the third through-hole of the diversion tee and enter the diversion tee.

[0081] The second port of the flow control tee is connected to the air inlet of the heating furnace hot blast stove 3-6, and the third port is connected to the air inlet of the transfer furnace hot blast stove 3-9. A third flue gas regulating valve 4-5 is located between the third port of the flow control tee and the air inlet of the transfer furnace hot blast stove 3-9; a fourth flue gas regulating valve 4-6 is located between the second port of the flow control tee and the air inlet of the heating furnace hot blast stove 3-6. By controlling the third and fourth flue gas regulating valves 4-5 and 4-6, the circulating flue gas is rationally distributed and controlled. That is, the first port of the flow control tee receives the circulating flue gas diverted by the diversion tee, and the diverted circulating flue gas is distributed to the heating furnace hot blast stove 3-6 and the transfer furnace hot blast stove 3-9 as needed through the regulation of the third and fourth flue gas regulating valves 4-5 and 4-6. In this way, the flue gas discharged from the heat exchange unit is diverted into circulating flue gas according to the demand of the heating furnace hot blast stove 3-6 and the transformation furnace hot blast stove 3-9, which increases the initial temperature of the air in the heating furnace hot blast stove 3-6 and the transformation furnace hot blast stove 3-9, and saves fuel resources in the heating furnace burner 3-7 and the transformation furnace burner 3-10.

[0082] In one embodiment of this disclosure, the flue gas purification assembly includes a denitrification device 4-12, a flue gas heat exchange device 4-13, a desulfurization device 4-14, and an electrostatic demister 4-15 connected in sequence; the denitrification device 4-12 is connected to the second through hole of the diversion tee pipe, so that the emitted flue gas meets the emission standards after being purified.

[0083] In one embodiment of this disclosure, the second outlet of the dust collector 4-1 is connected to a heat exchange unit, allowing solid materials in the dust collector 4-1 to enter the heat exchange unit for recycling. Further, the dust collector 4-1 is a high-temperature filter bag dust collector 4-1, such as... Figure 2 As shown, the second outlet of dust collector 4-1 is sequentially connected to a return material conveying device 4-8, a return material bin 4-9, a return material bin pump 4-10, and a feed bin 4-11. A return material control valve 4-7 is installed at the second outlet of dust collector 4-1. It can be understood that the material separated from the flue gas entering dust collector 4-1 is untransformed material. Thus, the solid material separated from dust collector 4-1 can be sequentially returned to the heat exchange duct of the heat exchange component through the return material control valve 4-7, the return material conveying device 4-8, the return material bin 4-9, the return material bin pump 4-10, and the feed bin 4-11, for heat exchange, and then transported to the heating furnace 3-1 for recycling. The return material conveying device 4-8 can be a screw conveyor. Furthermore, the feed hopper 4-11 is connected to the heat exchange duct of the secondary heat exchange component, which facilitates the connection between the feed hopper 4-11 and the heat exchange duct, and also enables the gradual heating of the material, allowing the material to be preheated more fully.

[0084] In one embodiment of this disclosure, the feeding unit includes a raw material feeding hopper 1-1, a quantitative feeder 1-2, an airlock feeder 1-3, and a static dispersing device 1-4 connected in sequence; the static dispersing device 1-4 is connected to the first inlet of the heat exchange unit. This allows the spodumene material to enter the heat exchange components of the heat exchange unit for preheating according to preset process parameters. These preset process parameters may include the weight of the spodumene material, the particle size of the material powder, etc.

[0085] This disclosure also provides a process for spodumene conversion roasting, waste heat recovery, and tail gas treatment, such as... Figure 3 As shown, the process flow is as follows:

[0086] S10. Start the first and second air supply components of the transformation unit and start the feeding unit.

[0087] S20. The hot flue gas separated by the gas-solid separator 3-4 enters the heat exchange unit through the gas outlet of the gas-solid separator 3-4, where it exchanges heat with the material conveyed by the feeding unit. The temperature of the material increases after heat exchange, raising its base temperature and achieving preheating of the material while recovering and utilizing the heat from the hot flue gas. Furthermore, the temperature of the material after heat exchange reaches 800–900°C, which is close to the transformation temperature of spodumene, facilitating temperature control by the heating furnace 3-1 and the transformation furnace 3-2, and reducing the energy consumption of the heating furnace 3-1 and the transformation furnace 3-2. The hot flue gas after heat exchange is discharged to the flue gas treatment unit through the second outlet of the heat exchange unit for treatment.

[0088] S30. The heat-exchanged material enters the heating furnace 3-1. Under the heating of the first air supply component, the heat-exchanged material is further heated to the preset temperature in a suspended state. The preset temperature can be 1050~1100℃.

[0089] S40. The heated material is suspended and rises into the transformation furnace 3-2. Under the heating of the second air supply component, the material is transformed and suspended and rises. It enters the transformation material gas-solid separator 3-4 through the transformation material inlet for gas-solid separation.

[0090] S50, the solid material separated by the gas-solid separator 3-4 enters the subsequent process through the solid outlet of the gas-solid separator 3-4; further, the solid material separated after transformation is transported to the transformation material cooling unit through the solid outlet of the gas-solid separator 3-4 and the transformation material counterweight airlock valve 3-5, and is cooled by the waste heat recovery boiler 5-1 and the silo pneumatic pump 5-2, and enters the next process under the action of the silo pneumatic pump 5-2.

[0091] The hot flue gas separated by the gas-solid separator 3-4 enters the heat exchange unit through the gas outlet of the gas-solid separator 3-4. In this way, the hot flue gas is recycled until the corresponding batch of material is processed.

[0092] It should be noted that although the various steps of the process for spodumene conversion roasting, waste heat recovery, and tail gas treatment in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0093] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment, characterized in that, It includes a feeding unit, a heat exchange unit, a transformation unit, and a flue gas treatment unit; The transformation unit includes a heating assembly, a transformation component, and a gas-solid separator for the transformation material. The transition material gas-solid separator includes a transition material inlet, a solid outlet, and a gas outlet; the heating assembly includes a heating furnace and a first air supply assembly, the first air supply assembly being connected to a first inlet of the heating furnace; the transition assembly includes a transition furnace and a second air supply assembly, the second air supply assembly being connected to a first inlet of the transition furnace; the first outlet of the heating furnace is connected to a second inlet of the transition furnace, and the first outlet of the transition furnace is connected to the transition material inlet of the transition material gas-solid separator; Both the heating furnace and the conversion furnace are vertical furnaces, and the conversion furnace is located above the heating furnace. The second inlet and the first inlet of the heating furnace are both located at the lower part of the heating furnace, with the second inlet located higher than the first inlet; the first outlet of the heating furnace is located at the upper end of the heating furnace, and the second inlet of the transfer furnace is located at the lower end of the transfer furnace. The flue gas treatment unit includes a dust collector, a diversion tee, a flue gas regulating valve group, a flow control tee, and a flue gas purification component; The first inlet of the dust collector is connected to the second outlet of the heat exchange unit; The first through hole of the diversion tee is connected to the first through hole of the flow control tee, and the second through hole of the diversion tee is connected to the flue gas purification component; the third through hole of the diversion tee is connected to the first outlet of the dust collector, and the first outlet of the dust collector is used to discharge the flue gas after dust removal. The second through hole of the flow control tee is connected to the first air supply component, and the third through hole of the flow control tee is connected to the second air supply component; The flue gas regulating valve group includes a first flue gas regulating valve, a second flue gas regulating valve, a third flue gas regulating valve and a fourth flue gas regulating valve; The first flue gas regulating valve is disposed between the second through hole of the diversion tee and the flue gas purification component; the second flue gas regulating valve is disposed between the first through hole of the diversion tee and the first through hole of the flow control tee, for the purpose of diverting the flue gas after heat exchange according to the demand of the heating furnace and the conversion furnace. The third flue gas regulating valve is disposed between the third through hole of the flow control tee and the second air supply component; the fourth flue gas regulating valve is disposed between the second through hole of the flow control tee and the first air supply component. The first air supply assembly includes a primary air fan for the heating furnace, a burner for the heating furnace, and a hot air furnace for the heating furnace, which are connected in sequence; the air inlet of the hot air furnace for the heating furnace is connected to the second through hole of the flow control tee, and the air outlet of the hot air furnace for the heating furnace is connected to the first inlet of the heating furnace. The second air supply assembly includes a primary air blower for the conversion furnace, a burner for the conversion furnace, and a hot blast stove for the conversion furnace, which are connected in sequence. The air inlet of the hot blast stove for the conversion furnace is connected to the third through hole of the flow control tee, and the air outlet of the hot blast stove for the conversion furnace is connected to the first inlet of the conversion furnace. The first inlet of the heat exchange unit is connected to the feeding unit, so that the material conveyed by the feeding unit enters the heat exchange unit; the second inlet of the heat exchange unit is connected to the gas outlet of the conversion material gas-solid separator, so as to receive the hot flue gas discharged from the conversion furnace. The first outlet of the heat exchange unit is connected to the second inlet of the heating furnace, so that the material after heat exchange can enter the heating furnace; the second outlet of the heat exchange unit is connected to the flue gas treatment unit, so that the flue gas after heat exchange can enter the flue gas treatment unit for treatment. The solid outlet of the gas-solid separator for the transformed material is used to allow the transformed material to enter the subsequent process.

2. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 1, characterized in that, The heat exchange unit includes a primary heat exchange assembly; The heat exchange assembly includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve; the heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a material outlet. The first end of the heat exchange duct is connected to both the feeding unit and the gas outlet of the transition material gas-solid separator. The second end of the heat exchange duct is connected to the mixing inlet of the heat exchange gas-solid separator. The air outlet of the heat exchange gas-solid separator is connected to the flue gas treatment unit. The discharge outlet of the heat exchange gas-solid separator is connected to the inlet of the counterweight airlock valve. The outlet of the counterweight airlock valve is connected to the second inlet of the heating furnace.

3. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 1, characterized in that, The heat exchange unit includes N cascaded heat exchange components, where N≥2; Each heat exchange component includes a heat exchange duct, a heat exchange gas-solid separator, and a counterweight airlock valve; the heat exchange gas-solid separator includes a mixing inlet, an air outlet, and a material outlet. The first end of the heat exchange duct of the first-stage heat exchange component is connected to the feeding unit; the air outlet of the heat exchange gas-solid separator of the first-stage heat exchange component is connected to the flue gas treatment unit. The first end of the heat exchange duct of the Nth stage heat exchange component is connected to the gas outlet of the gas-solid separator of the transition material; the outlet of the counterweight airlock valve of the Nth stage heat exchange component is connected to the second inlet of the heating furnace. In adjacent heat exchanger stages, the first end of the heat exchange duct of the Kth stage heat exchanger is connected to the outlet of the heat exchange gas-solid separator of the (K+1)th stage heat exchanger, and the outlet of the counterweight airlock valve of the Kth stage heat exchanger is connected to the first end of the heat exchange duct of the (K+1)th stage heat exchanger. <N; The second end of the heat exchange air duct of each heat exchange component is connected to the mixing inlet of the corresponding heat exchange gas-solid separator, and the outlet of each heat exchange gas-solid separator is connected to the inlet of the corresponding counterweight airlock valve.

4. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 3, characterized in that, The heat exchange unit includes four cascaded heat exchange components.

5. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 1, characterized in that, It also includes a material cooling unit for the transformation process; The transition material cooling unit includes a waste heat recovery boiler and a silo-type pneumatic pump connected in sequence; the waste heat recovery boiler is connected to the solid outlet of the transition material gas-solid separator. The waste heat recovery boiler includes an inner furnace layer and an outer furnace layer, with an annular cavity formed between the inner furnace layer and the outer furnace layer; The annular cavity has a water inlet, a water outlet, and a gas outlet; the water inlet is located at the lower part of the outer furnace layer, and the water outlet and the gas outlet are both located at the upper part of the outer furnace layer. The position of the gas outlet is higher than that of the water outlet, so as to allow the transformation material in the inner furnace layer to exchange heat with the water in the annular cavity and generate water vapor. The chamber-type pneumatic pump is used to further exchange heat between compressed air and the heat-exchanged transition material.

6. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 1, characterized in that, The second outlet of the dust collector is connected to the heat exchange unit, so that the solid material in the dust collector can enter the heat exchange unit for recycling. The dust collector is a high-temperature filter bag dust collector, and a flue gas exhaust fan is installed between the high-temperature filter bag dust collector and the third through hole of the diversion tee pipe. The flue gas purification assembly includes a denitrification device, a flue gas heat exchange device, a desulfurization device, and an electrostatic demister connected in sequence. The denitrification device is connected to the second through hole of the diversion tee.

7. The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to claim 1, characterized in that, The feeding unit includes a raw material feeding hopper, a quantitative feeder, an airlock feeder, and a static dispersing device connected in sequence; the static dispersing device is connected to the first inlet of the heat exchange unit.

8. A process for spodumene conversion roasting, waste heat recovery, and tail gas treatment, characterized in that, The apparatus for spodumene conversion roasting, waste heat recovery, and tail gas treatment according to any one of claims 1-7 comprises: S10. Start the first and second air supply components of the transformation unit and start the feeding unit; S20. The hot flue gas separated by the gas-solid separator for the transition material enters the heat exchange unit through the gas outlet of the gas-solid separator for heat exchange with the material conveyed by the feeding unit. S30. The material after heat exchange enters the heating furnace. Under the heating of the first air supply component, the material after heat exchange is further heated to the preset temperature in a suspended state. The hot flue gas after heat exchange is discharged to the flue gas treatment unit through the second outlet of the heat exchange unit. S40. The heated material is suspended and rises into the conversion furnace. Under the heating of the second air supply component, the material is converted and suspended and rises. It enters the conversion material gas-solid separator through the conversion material inlet for gas-solid separation. S50. The solid material separated by the transition material gas-solid separator enters the subsequent process through the solid outlet of the transition material gas-solid separator; the hot flue gas separated by the transition material gas-solid separator enters the heat exchange unit through the gas outlet of the transition material gas-solid separator.

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