Roasting furnace material sensible heat recovery and balance system based on steam reuse

Abstract

The invention discloses a roasting furnace material sensible heat recovery and balance system based on steam reuse, which relates to the technical field of waste heat recovery and utilization and comprises a material sensible heat recovery device, a steam generation device and a steam condensation heat exchange device. High-temperature materials can be introduced into the material sensible heat recovery device, and circulating fluid can also be introduced into the material sensible heat recovery device to exchange heat with the high-temperature materials for heating; the circulating fluid can circulate between the material sensible heat recovery device and the steam generation device, and the heated circulating fluid can enter the steam generation device to be subjected to flash evaporation to generate saturated steam; the steam condensation heat exchange device can be used for introducing saturated steam, the steam condensation heat exchange device further communicates with a feeding port of the roasting system, the steam condensation heat exchange device is used for introducing front-end materials and drying the front-end materials under the action of the saturated steam, and the dried front-end materials can be introduced into the roasting system. According to the roasting furnace material sensible heat recovery and balance system based on steam reuse, the economic and environment-friendly benefits are improved.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery and utilization technology, and in particular to a sensible heat recovery and balancing system for roasting furnace materials based on steam reuse. Background Technology

[0002] Roasting is a core process in industrial production for the high-temperature heat treatment of solid materials, such as roasting production systems in industries like metallurgy (e.g., iron ore and non-ferrous metal ore roasting), chemicals (e.g., various catalyst roasting and carbonate roasting), and building materials (e.g., limestone calcination and ceramic raw material roasting). The high-temperature materials discharged from the roasting furnace are typically 400-800℃ (e.g., the material temperature after iron ore roasting is about 600℃, and the clinker temperature after limestone roasting is about 700℃). To meet the process requirements of subsequent transportation, storage, or further processing, the high-temperature materials need to be cooled. At the same time, the raw materials at the front end of the roasting furnace (e.g., mineral powder, limestone powder, and catalyst precursors) usually contain 10%-30% moisture, which needs to be dried to a moisture content of ≤5% before being fed into the roasting furnace. Otherwise, it will lead to a decrease in roasting efficiency, an increase in fuel consumption, or even material agglomeration and blockage of the furnace.

[0003] Currently, the following defects exist in the drying of high-temperature materials in calcining furnaces and in the drying of upstream materials: 1. Ineffective recovery and utilization of sensible heat from high-temperature materials: The mainstream methods are air cooling or traditional water cooling. Air cooling directly discharges hot air into the atmosphere through a blower, and 30%-40% of the total energy consumption of roasting is lost with the hot air. In addition, the hot air carries dust and requires additional treatment. Although traditional water cooling can recover some heat, it only forms low-temperature hot water at ≤80℃, which has low waste heat value. Furthermore, direct water spraying cooling will generate dusty wastewater, and indirect water cooling is prone to efficiency reduction due to scaling on the heat exchange tube walls, resulting in an equipment lifespan of only 1-2 years.

[0004] 2. High energy consumption in front-end material drying: Most enterprises rely on hot air generated from the combustion of coal or natural gas as the drying medium. Fuel consumption accounts for 20%-25% of the total energy consumption of roasting, and it also emits SO2 and NO. x Pollutants such as these cause extremely high environmental remediation costs; some enterprises use externally purchased steam for drying, which not only requires paying for boiler operation costs, but also results in heat loss of 10%-12% in steam transmission pipelines, leading to low energy utilization efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a steam-recycled sensible heat recovery and balancing system for roasting furnace materials, in order to solve the problems existing in the prior art and improve economic and environmental benefits.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides a sensible heat recovery and balancing system for a roasting furnace based on steam reuse, comprising a sensible heat recovery device, a steam generator, and a steam condensation heat exchanger. The sensible heat recovery device is connected to the outlet of the roasting system and can introduce high-temperature materials. A circulating fluid can be introduced into the sensible heat recovery device to exchange heat with the high-temperature materials and raise their temperature. The steam generator is connected to the sensible heat recovery device so that the circulating fluid can circulate between the two devices. The heated circulating fluid can then enter the steam generator to flash-evaporate and generate saturated steam. The steam condensation heat exchanger is connected to the steam generator and can introduce the saturated steam. The steam condensation heat exchanger is also connected to the inlet of the roasting system. The steam condensation heat exchanger is used to introduce upstream materials and dry them under the action of the saturated steam. The dried upstream materials can then be introduced into the roasting system.

[0007] Preferably, the material sensible heat recovery device includes a first support, a sensible heat recovery cylinder, and a first rotary drive; the sensible heat recovery cylinder is connected to the first support, and the first rotary drive is connected to the sensible heat recovery cylinder and can drive the sensible heat recovery cylinder to rotate around its own axis; the heat inlet in the sensible heat recovery cylinder is used to connect to the outlet of the roasting system and can introduce high-temperature materials, and the heat outlet in the sensible heat recovery cylinder is used to discharge the cooled high-temperature materials; the cold inlet and cold outlet in the sensible heat recovery cylinder are both connected to the steam generator and are used to introduce and discharge the circulating fluid, respectively.

[0008] Preferably, the steam generating device includes a steam generating tank and a steam distribution cylinder; the liquid inlet and liquid outlet of the steam generating tank are both connected to the material sensible heat recovery device and are used to respectively introduce and discharge the circulating fluid, the circulating fluid can flash evaporate in the steam generating tank to generate saturated steam; the steam outlet of the steam generating tank is connected to the steam inlet of the steam distribution cylinder, and one steam outlet of the steam distribution cylinder can be connected to the steam condensation heat exchange device.

[0009] Preferably, a pressure-reducing valve is installed on the liquid inlet pipe of the steam generator, and a pressure regulating valve is installed on the steam outlet pipe of the steam generator; the steam generator is also equipped with a pressure monitoring device and a liquid level monitoring device to monitor the pressure information and liquid level information inside the steam generator, respectively; the pressure-reducing valve, the pressure regulating valve, the pressure monitoring device and the liquid level monitoring device can all be communicatively connected to an external central control mechanism.

[0010] Preferably, the steam condensation heat exchange device includes a second support, a drying cylinder, and a second rotary drive; the drying cylinder is connected to the second support, and the second rotary drive is connected to the drying cylinder and can drive the drying cylinder to rotate around its own axis; the hot flow inlet in the drying cylinder is connected to the saturated steam discharged from the steam generator, and the cold flow inlet in the drying cylinder is used to introduce the front-end material, and the saturated steam can dry the front-end material; and the cold flow outlet of the drying cylinder is used to connect to the feed inlet of the roasting system, so that the dried front-end material can enter the roasting system.

[0011] Preferably, it further includes a condensate recovery device, which is connected to the steam condensation heat exchange device and the steam generator. The condensate recovery device can recover the condensate generated after the saturated steam in the steam condensation heat exchange device releases heat and can be introduced into the steam generator.

[0012] Preferably, the condensate recovery device includes a condensate expansion container and a condensate tank connected in sequence. The condensate generated after the saturated steam releases heat enters the condensate tank for storage after passing through the condensate expansion container. The condensate tank is connected to the steam generator and can replenish condensate into the steam generator. The condensate tank is equipped with a condensate level monitoring device for monitoring the condensate level, and the condensate level monitoring device can be communicatively connected to an external central control mechanism.

[0013] Preferably, it also includes an exhaust gas treatment system connected to the exhaust gas outlet of the steam condensation heat exchanger, the exhaust gas treatment system being able to treat the exhaust gas generated from the drying of the front-end material in the steam condensation heat exchanger.

[0014] Preferably, the exhaust gas treatment system includes a cyclone dust collector, an exhaust gas heater, a bag filter, an induced draft fan, and an exhaust tower connected in sequence; the cyclone dust collector is used to remove dust from the exhaust gas generated by the drying of the front-end material, the exhaust gas heater is used to heat the exhaust gas, the bag filter is used to remove dust from the exhaust gas, and the induced draft fan is used to drive the exhaust gas to circulate and discharge it through the exhaust tower.

[0015] Preferably, it also includes a backup water supply system, which is connected to the steam generator and is capable of providing backup soft water to the steam generator.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention provides a steam-recycled material sensible heat recovery and balancing system for roasting furnaces. It integrates a material sensible heat recovery device with a steam generator. The sensible heat recovery device recovers the sensible heat of the high-temperature materials generated in the roasting system, while the steam generator uses flash evaporation to produce low-pressure saturated steam. This saturated steam is then directionally transported to a steam condensation heat exchanger at the front end of the roasting system to dry the materials. This achieves an energy cycle of "material sensible heat recovery → steam preparation → drying and reuse," thereby reducing the overall energy consumption of the roasting process, decreasing pollutant emissions, and improving the stability and economy of equipment operation. Furthermore, the direct-connection integrated design of the material sensible heat recovery device and the steam generator improves recovery efficiency and reduces waste heat loss compared to traditional multi-stage heat exchange systems. The indirect drying method avoids direct contact between the traditional high-heat flue gas and the front-end materials, ensuring the purity of the front-end materials and reducing SO2 and NO emissions. x It eliminates the inefficient discharge of pollutants such as dust-laden wastewater and hot air. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the sensible heat recovery and balance system for roasting furnace materials based on steam reuse provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the material sensible heat recovery device provided in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the steam generator provided in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the steam condensation heat exchange device provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the condensate recovery device provided in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the exhaust gas treatment system provided in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the backup water replenishment system provided in Embodiment 1 of the present invention.

[0019] In the diagram: 1-Sensible heat recovery device; 11-Feeding device; 12-Sensible heat recovery cylinder; 13-First rotary drive; 14-First support; 15-Circulating fluid system; 16-First outlet device; 17-Support base; 18-Return water pipe; 19-Inlet water pipe; 2-Steam generating unit; 21-Steam generating tank; 22-Sewage tank; 23-Steam distribution cylinder; 24-Boosting circulation pump; 3-Backup water supply system; 31-Soft water treatment equipment; 32-Soft water tank; 33-Backup water supply pump; 4-Steam condensation heat exchanger; 41-Feed screw conveyor; 42-Drying cylinder; 43-Second rotary drive; 44-Second support; 45-Second outlet device; 46-Circulating steam system; 47-Steam inlet pipe; 48-Water outlet pipe; 5-Exhaust gas treatment system; 51-Cyclone dust collector; 52-Exhaust gas heater; 53-Bag filter dust collector; 54-Induced draft fan; 55-Emission tower; 6-Condensate recovery device; 61-Drainage expansion container; 62-Condensate tank; 63-Condensate makeup pump. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide a steam-recycled sensible heat recovery and balancing system for roasting furnace materials, in order to solve the problems existing in the prior art and improve economic and environmental benefits.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 This embodiment provides a sensible heat recovery and balancing system for roasting furnace materials based on steam reuse. Please refer to [link to relevant documentation]. Figure 1The system includes a material sensible heat recovery device 1, a steam generator 2, and a steam condensation heat exchange device 4. The material sensible heat recovery device 1 is connected to the outlet of the roasting system and can be used to introduce high-temperature materials. A circulating fluid can be introduced into the material sensible heat recovery device 1 to exchange heat with the high-temperature materials and raise their temperature. The steam generator 2 is connected to the material sensible heat recovery device 1 so that the circulating fluid can circulate between the material sensible heat recovery device 1 and the steam generator 2. The heated circulating fluid can enter the steam generator 2 to flash-evaporate and generate saturated steam. The steam condensation heat exchange device 4 is connected to the steam generator 2 and can be used to introduce saturated steam. The steam condensation heat exchange device 4 is also connected to the inlet of the roasting system. The steam condensation heat exchange device 4 is used to introduce the front-end materials and dry them under the action of saturated steam. The dried front-end materials can then be introduced into the roasting system.

[0024] In this design, the material sensible heat recovery device 1 is integrated with the steam generator 2. The material sensible heat recovery device 1 recovers the sensible heat of the high-temperature materials generated in the roasting system, and the steam generator 2 uses flash evaporation to generate low-pressure saturated steam. The saturated steam is then directionally transported to the steam condensation heat exchange device 4 at the front end of the roasting system to dry the front-end materials. This achieves an energy cycle of "material sensible heat recovery → steam preparation → drying and reuse," thereby reducing the overall energy consumption of the roasting process, reducing pollutant emissions, and improving the stability and economy of equipment operation. Moreover, the direct connection and integration design of the material sensible heat recovery device 1 and the steam generator improves the recovery efficiency and reduces waste heat loss compared to traditional multi-stage heat exchange links. Furthermore, the indirect drying method avoids direct contact between the traditional high-heat flue gas and the front-end materials, ensuring the purity of the front-end materials and reducing SO2 and NO emissions. x It eliminates the inefficient discharge of pollutants such as dust-laden wastewater and hot air.

[0025] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 2 The material sensible heat recovery device 1 includes a first support 14, a sensible heat recovery cylinder 12, and a first rotary drive 13. The sensible heat recovery cylinder 12 is connected to the first support 14, and the first rotary drive 13 is connected to the sensible heat recovery cylinder 12 and can drive the sensible heat recovery cylinder 12 to rotate around its own axis. The heat inlet in the sensible heat recovery cylinder 12 is used to connect to the outlet of the roasting system and can introduce high-temperature materials. The heat outlet in the sensible heat recovery cylinder 12 is used to discharge the cooled high-temperature materials. The cold inlet and cold outlet in the sensible heat recovery cylinder 12 are both connected to the steam generator 2 and are used to introduce and discharge circulating fluid, respectively.

[0026] The sensible heat recovery cylinder 12 adopts a tubular design, consisting of multiple steel pipes made of wear-resistant alloy steel. Wear-resistant protective tiles are installed at key material scouring locations to enhance wear resistance. Fins seal the steel pipes, and circulating fluid flows inside the pipes. The cavity formed by the annular combination of steel pipes serves as the flow space for high-temperature materials. The first support 14 can be configured as a support ring, fixedly sleeved around the sensible heat recovery cylinder 12 for synchronous rotation. The first support 14 is rotatably connected to the support base 17 via a conventional rotating system. Specifically, the rotating system may include a support wheel assembly mounted on the support base 17 and rollingly connected to the outer ring of the support ring. One end of the sensible heat recovery cylinder 12 is connected to and connected to the feeding device 11 (e.g., a feeding shell) via a rotary joint. The feeding device 11 is used to introduce high-temperature materials. The other end of the sensible heat recovery cylinder 12 is connected to the first outlet device 16 (e.g., a discharge shell) via a rotary joint, enabling the discharge of high-temperature materials after heat exchange. The material after heat exchange is discharged through the first outlet device 16 and then enters... The material is conveyed to the silo for storage in subsequent processing. One end of the sensible heat recovery cylinder 12 is connected to the circulating fluid system 15 via a rotary joint, which is connected to the inlet pipe 19 and the return pipe 18 respectively. The inlet pipe 19 and the return pipe 18 are connected to the steam generator 2 respectively. The inlet pipe 19 is used to circulate saturated condensate, and the return pipe 18 is used to circulate high-temperature and high-pressure hot water, thus forming a closed loop for circulating fluid. In addition, the first rotary drive 13 is a rotary motor that can be set on the support base 17 and connected to the sensible heat recovery cylinder 12. It can drive the entire sensible heat recovery cylinder 12 to rotate. The spiral blades are welded inside the sensible heat recovery cylinder 12. Its function is to convey the high-temperature material from the feed end to the discharge end, and at the same time absorb the heat released by the material, and then transfer the heat to the circulating fluid on the sensible heat recovery cylinder 12. It should be noted that the structure of the sensible heat recovery cylinder 12 is not limited to the above description. Other conventional heat exchange cylinders can also be used, as long as they can meet the heat exchange requirements of high-temperature materials and circulating fluid.

[0027] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 3 The steam generating device 2 includes a steam generating tank 21 and a steam distribution cylinder; the liquid inlet and liquid outlet of the steam generating tank 21 are both connected to the material sensible heat recovery device 1 and are used to introduce and discharge circulating fluid respectively. The circulating fluid can flash evaporate in the steam generating tank 21 to generate saturated steam; the steam outlet of the steam generating tank 21 is connected to the steam inlet of the steam distribution cylinder, and one steam outlet of the steam distribution cylinder can be connected to the steam condensation heat exchange device 4.

[0028] More preferably, a pressure reducing valve is installed on the liquid inlet pipe of the steam generator 21, and a pressure regulating valve is installed on the steam outlet pipe of the steam generator 21; and a pressure monitoring device and a liquid level monitoring device are also installed on the steam generator 21 to monitor the pressure information and liquid level information inside the steam generator 21 respectively; the pressure reducing valve, the pressure regulating valve, the pressure monitoring device and the liquid level monitoring device can all be communicatively connected to an external central control mechanism.

[0029] The liquid inlet pipeline is equipped with an electrically operated pressure-reducing valve. High-temperature, high-pressure softened water from the return water pipe 18 of the material sensible heat recovery device 1 is regulated to 0.3-0.5 MPa (a low-pressure parameter suitable for drying requirements) via the electrically operated pressure-reducing valve. The sudden pressure drop causes the softened water to vaporize, generating low-pressure saturated steam, which then enters the steam distributor 23 through the steam outlet. The steam outlet of the steam distributor 23 is connected to the steam condensation heat exchange device 4 via an insulated pipeline. An electrically operated pressure regulating valve is installed on the pipeline connecting the steam distributor 23 and the steam generator 21. The valve's opening and closing pressure thresholds are set to ensure that steam pressure fluctuations are controlled within ±0.02 MPa. Meanwhile, the saturated condensate in the steam generator 2 is re-entered into the material sensible heat recovery device 1 via the booster circulation pump 24 connected to the steam generator 21 through the inlet water pipe 19 for further processing. After heating, the temperature rises again, and the steam enters the steam generator 21 again to reduce pressure and generate saturated steam. This cycle repeats. Wastewater generated in the steam generator 21 enters the wastewater tank 22, and wastewater generated in the steam distributor 23 is also discharged into the wastewater pool. The steam generator 21 is equipped with pressure monitoring devices and liquid level monitoring devices. The signals are transmitted in real time to an external central control mechanism such as a PLC control system, which automatically adjusts the opening of the pressure reducing valve according to the pressure to maintain pressure stability. Specifically, by using a flash evaporator in the steam generator 21 and a steam distributor 23 as a steam buffer tank, the saturated steam can be distinguished, allowing the saturated steam to be used for subsequent drying or enter the steam pipeline network. Thus, through the closed-loop control of the flash evaporator and the pressure stabilizing effect of the steam buffer tank, it is beneficial to control the steam pressure fluctuation range within ±0.02MPa and the steam output fluctuation rate ≤5%, which meets the continuous production requirements of subsequent drying.

[0030] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 4 The steam condensation heat exchange device 4 includes a second support 44, a drying cylinder 42, and a second rotary drive 43. The drying cylinder 42 is connected to the second support 44, and the second rotary drive 43 is connected to the drying cylinder 42 and can drive the drying cylinder 42 to rotate relative to the second support 44. The hot flow inlet in the drying cylinder 42 is connected to the saturated steam discharged from the steam generator 2, and the cold flow inlet in the drying cylinder 42 is used to introduce the front-end material. The saturated steam can dry the front-end material. The cold flow outlet in the drying cylinder 42 is used to connect to the feed inlet of the roasting system so that the dried front-end material can enter the roasting system.

[0031] The low-pressure saturated steam from the steam distribution cylinder 23 enters the drying cylinder 42 of the steam condensation heat exchange device 4 through the steam inlet. Heating tubes are installed inside the drying cylinder 42, running through the entire cylinder and arranged in 1-5 concentric circles. Steam enters the drying cylinder 42 through a circulating steam system 46 at one end and is evenly distributed to each heating tube. The second support 44 can be configured as a support ring, fixedly sleeved on the outside of the drying cylinder 42 for synchronous rotation. The second support 44 is rotatably connected to a base via a conventional rotating system. Specifically, the rotating system may include a support wheel assembly, mounted on the base and tumbling with the outer ring of the support ring. One end of the drying cylinder 42 is connected to and communicates with the feeding screw device 41 via a rotary joint. The feeding screw device 41 is used to introduce the material from the front end. The other end of the drying cylinder 42 is connected to a second outlet device 45 (such as a discharge shell) via a rotary joint, realizing the discharge of the material after heat exchange. After being discharged through the first outlet device 16, the front-end material enters the next-stage conveying equipment and is transported to the roasting system. One end of the drying cylinder 42 is also connected to the circulating steam system 46 through a rotary joint, which is connected to the steam inlet pipe 47 and the water outlet pipe 48 respectively. The steam inlet pipe 47 and the water outlet pipe 48 are respectively connected to the steam generator 2 and the condensate recovery device 6. In addition, the second rotary drive 43 is configured as a rotary motor connected to the drying cylinder 42 and can drive the entire drying cylinder 42 to rotate. The material entering the cylinder is dried by the condensation heat of the steam in the heating pipe under the action of the cylinder rotation and the stirring action of the heating pipe, and moves from the feed end to the discharge end. It is discharged from the discharge port into the next-stage conveying equipment and transported to the roasting system for roasting. The condensate that the steam becomes after releasing the latent heat of condensation enters the condensate recovery device 6 through the water outlet. It should be noted that the structure of the drying cylinder 42 is not limited to the above description. Other conventional heat exchange cylinders can also be used, as long as they can meet the heat exchange requirements of the front-end material and saturated steam.

[0032] In the optional embodiments of this example, a more preferred embodiment is that the steam-recycled sensible heat recovery and balancing system for roasting furnace materials further includes a condensate recovery device 6. Please refer to [link to relevant documentation]. Figure 5 The condensate recovery device 6 is connected to the steam condensation heat exchange device 4 and the steam generator 2. The condensate recovery device 6 can recover the condensate generated after the saturated steam in the steam condensation heat exchange device 4 releases heat, and can also be introduced into the steam generator 2. The condensate recovery device 6 is used to supplement the water circulation volume reduced by the steam generator 2 after steam is generated, so as to maintain the overall thermal balance and material balance of the entire system.

[0033] More preferably, the condensate recovery device 6 includes a condensate expansion container 61 and a condensate tank 62 connected in sequence. The condensate generated after the saturated steam releases heat enters the condensate tank 62 for storage after passing through the condensate expansion container 61. The condensate tank 62 is connected to the steam generator 2 and can replenish condensate into the steam generator 2. The condensate tank 62 is equipped with a condensate level monitoring device for monitoring the condensate level. The condensate level monitoring device can be communicatively connected to an external central control mechanism.

[0034] The condensate formed after the steam releases its latent heat of condensation enters the condensate expansion container 61 through the outlet pipe 48 of the steam condensation heat exchange device 4. After being discharged from the condensate expansion container 61, the condensate enters the condensate tank 62 for storage. This is used to replenish the water circulation volume reduced by the steam generator 2 after steam generation, so as to maintain the overall thermal and material balance of the entire system. When the liquid level sensor on the steam generator 21 indicates a low liquid level, the condensate water replenishment pump 63 in the condensate recovery device 6 automatically replenishes water to ensure that the liquid level is stable within the set range. The condensate tank 62 is equipped with a condensate liquid level monitoring device, i.e., a liquid level sensor, which transmits the signal to the external central control mechanism, i.e., the PLC control system. When the liquid level display indicates a low liquid level, the condensate water replenishment pump 63 at the outlet of the condensate tank 62 stops working, and the backup water replenishment system 3 of the steam generator 2 replenishes water to the steam generator 2.

[0035] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 6 The steam-recycled roasting furnace material sensible heat recovery and balancing system provided in this embodiment also includes a tail gas treatment system 5, which is connected to the exhaust port of the steam condensation heat exchange device 4. The tail gas treatment system 5 can treat the exhaust gas generated by the front-end material drying in the steam condensation heat exchange device 4.

[0036] More preferably, the exhaust gas treatment system 5 includes a cyclone dust collector 51, an exhaust gas heater 52, a bag filter dust collector 53, an induced draft fan 54, and an exhaust tower 55 connected in sequence; the cyclone dust collector 51 is used to remove dust from the exhaust gas generated by the drying of the front-end material, the exhaust gas heater 52 is used to heat the exhaust gas, the bag filter dust collector 53 is used to remove dust from the exhaust gas, and the induced draft fan 54 is used to drive the exhaust gas to circulate and discharge it through the exhaust tower 55.

[0037] The dust-laden exhaust gas discharged from the exhaust port of the steam condensation heat exchange device 4 first passes through a cyclone dust collector 51 to remove large dust particles with a diameter ≥10μm, reducing the burden on subsequent equipment; then, it passes through a tail gas heater 52 to raise the temperature to 10-15℃ above the dew point temperature, preventing acidic substances from condensing in the subsequent bag filter 53; finally, it is sent to the emission tower 55 by an induced draft fan 54 to discharge the purified gas at high altitude, ensuring that pollutants are fully diffused in the atmosphere and meet environmental protection requirements.

[0038] In the optional solutions of this embodiment, a more preferred option is described in the following description: Figure 7 The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse provided in this embodiment also includes a backup water supply system 3, which is connected to the steam generator 2 and can provide backup soft water to the steam generator 2.

[0039] The backup water supply system 3 mainly includes a soft water treatment device 31, a soft water tank 32, and a backup water supply pump 33. The source water is softened by the soft water treatment device 31 and stored in the soft water tank 32. When the water in the condensate recovery device 6 is insufficient, the backup water supply pump 33 automatically replenishes water to the steam generator 2 to ensure the stability of the entire system.

[0040] In this embodiment, the pumps, valves and sensors involved in the steam-recycled roasting furnace material sensible heat recovery and balance system are all connected to the external central control mechanism, namely the PLC controller, to realize the feedback regulation and control of the system and to collaboratively realize the energy closed loop of "sensible heat recovery-steam generation-drying and reuse".

[0041] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A sensible heat recovery and balancing system for roasting furnace materials based on steam reuse, characterized in that: include: A material sensible heat recovery device is used to connect to the outlet of the roasting system and to allow the introduction of high-temperature materials. The material sensible heat recovery device can also allow the introduction of circulating fluid to exchange heat with the high-temperature materials and raise their temperature. A steam generator is connected to the material sensible heat recovery device so that the circulating fluid can circulate between the material sensible heat recovery device and the steam generator. The heated circulating fluid can enter the steam generator to flash-generate saturated steam. and A steam condensation heat exchange device is connected to the steam generator and can introduce saturated steam. The steam condensation heat exchange device is also connected to the feed inlet of the roasting system. The steam condensation heat exchange device is used to introduce the front-end material and dry it under the action of the saturated steam. The dried front-end material can be introduced into the roasting system.

2. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: The material sensible heat recovery device includes a first support, a sensible heat recovery cylinder, and a first rotary drive; the sensible heat recovery cylinder is connected to the first support, and the first rotary drive is connected to the sensible heat recovery cylinder and can drive the sensible heat recovery cylinder to rotate around its own axis; the heat inlet in the sensible heat recovery cylinder is used to connect to the outlet of the roasting system and can introduce high-temperature materials, and the heat outlet in the sensible heat recovery cylinder is used to discharge the cooled high-temperature materials; the cold inlet and cold outlet in the sensible heat recovery cylinder are both connected to the steam generator and are used to introduce and discharge the circulating fluid, respectively.

3. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: The steam generating device includes a steam generating tank and a steam distribution cylinder; the liquid inlet and liquid outlet of the steam generating tank are both connected to the material sensible heat recovery device and are used to introduce and discharge the circulating fluid respectively, and the circulating fluid can flash evaporate in the steam generating tank to generate saturated steam; the steam outlet of the steam generating tank is connected to the steam inlet of the steam distribution cylinder, and one steam outlet of the steam distribution cylinder can be connected to the steam condensation heat exchange device.

4. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 3, characterized in that: The steam generator is equipped with a pressure reducing valve on the liquid inlet pipe and a pressure regulating valve on the steam outlet pipe. The steam generator is also equipped with a pressure monitoring device and a liquid level monitoring device to monitor the pressure and liquid level information inside the steam generator, respectively. The pressure reducing valve, the pressure regulating valve, the pressure monitoring device, and the liquid level monitoring device can all be communicatively connected to an external central control mechanism.

5. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: The steam condensation heat exchange device includes a second support, a drying cylinder, and a second rotary drive. The drying cylinder is connected to the second support, and the second rotary drive is connected to the drying cylinder and can drive the drying cylinder to rotate around its own axis. The hot flow inlet in the drying cylinder is connected to the saturated steam discharged from the steam generator, and the cold flow inlet in the drying cylinder is used to introduce the front-end material. The saturated steam can dry the front-end material. The cold flow outlet of the drying cylinder is connected to the feed inlet of the roasting system so that the dried front-end material can enter the roasting system.

6. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: It also includes a condensate recovery device, which is connected to the steam condensation heat exchange device and the steam generator. The condensate recovery device can recover the condensate generated after the saturated steam in the steam condensation heat exchange device releases heat, and can be introduced into the steam generator.

7. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 6, characterized in that: The condensate recovery device includes a condensate expansion container and a condensate tank connected in sequence. The condensate generated after the saturated steam releases heat enters the condensate tank for storage after passing through the condensate expansion container. The condensate tank is connected to the steam generator and can replenish condensate into the steam generator. The condensate tank is equipped with a condensate level monitoring device for monitoring the condensate level, and the condensate level monitoring device can be communicatively connected to an external central control mechanism.

8. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: It also includes an exhaust gas treatment system, which is connected to the exhaust gas outlet of the steam condensation heat exchange device. The exhaust gas treatment system is capable of treating the exhaust gas generated by the drying of the front-end material in the steam condensation heat exchange device.

9. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 8, characterized in that: The exhaust gas treatment system includes a cyclone dust collector, an exhaust gas heater, a bag filter, an induced draft fan, and an exhaust tower connected in sequence. The cyclone dust collector is used to remove dust from the exhaust gas generated by the drying of the front-end material, the exhaust gas heater is used to heat the exhaust gas, the bag filter is used to remove dust from the exhaust gas, and the induced draft fan is used to drive the exhaust gas to circulate and discharge it through the exhaust tower.

10. The sensible heat recovery and balancing system for roasting furnace materials based on steam reuse according to claim 1, characterized in that: It also includes a backup water supply system, which is connected to the steam generator and can provide backup soft water to the steam generator.

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