System for drying materials by using kiln waste heat

Abstract

The invention discloses a system for drying materials through kiln waste heat. The invention relates to a novel energy-saving kiln which comprises a kiln body, the kiln body is composed of a combustion chamber, a ventilation pipeline and a smoke exhaust pipeline, a finned tube type heat exchanger, a heat exchange pipeline, a pressure pump and a valve are installed outside the smoke exhaust pipeline, one end of the heat exchange pipeline is communicated with a drying mechanism, and the drying mechanism comprises a drying machine, a conveying belt, a heating disc, a fan and a dehumidification unit. Through the arrangement of the finned tube type heat exchanger, the heat exchange pipeline, the pressure pump and the valve, the finned tube type heat exchanger can transfer heat in smoke to the heat exchange pipeline, at the moment, the pressure pump works to accelerate airflow in the heat exchange pipeline, and the airflow enters the dryer through the valve to heat and dry materials; therefore, waste heat utilization of the flue gas exhausted by the kiln body is achieved, and resource waste caused by the fact that heat of the flue gas exhausted by the kiln body cannot be converted is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and particularly to a system for using the waste heat of a kiln for material drying. Background Art

[0002] A system for using the waste heat of a kiln for material drying is a device for efficiently utilizing energy, which can achieve energy conservation and emission reduction and reduce production costs.

[0003] In the comparative case, the publication number is CN114593602B. The present invention provides a flue gas waste heat recycling system, including a firing kiln, a green body drying kiln, a desulfurization tower, and a spray tower drying furnace. The high-temperature flue gas discharged from the firing kiln conducts the waste heat of the flue gas through a first heat exchanger and is used as the combustion-supporting air for fuel combustion in the spray tower drying furnace, thereby increasing the initial temperature and internal energy of the combustion-supporting air, making the fuel in the spray tower drying furnace easier to burn, and reducing the amount of combustion-supporting air and fuel required to generate the same amount of heat and flue gas temperature; at the same time, the waste heat of the flue gas conducted through the first heat exchanger can also be used as the air for drying ceramic green bodies in the green body drying furnace to reduce the fuel consumed during the drying of ceramic green bodies; in addition, the flue gas in the middle part during the firing process of the firing kiln is introduced into a second heat exchanger as a supplement to the heat that is not enough to complete the heat required for green body drying exported by the first heat exchanger. The second heat exchanger can be used as a backup of the first heat exchanger, and the purpose of saving energy, reducing carbon emissions, and improving the efficiency of the enterprise can be achieved.

[0004] However, in the implementation of the related technology, it is found that the above-mentioned flue gas waste heat recycling system has the following problems. In the comparative case, the high-temperature exhaust gas from the firing furnace is used to heat the air through the first heat exchanger. A part of the heated high-temperature hot air is used as the combustion-supporting air for combustion in the spray tower drying furnace through the fifth air flow channel to increase the initial temperature of the combustion-supporting air, which is beneficial to the full combustion of the fuel, thereby reducing the amount of combustion-supporting air required for combustion and making the flue gas temperature higher after combustion, which is more beneficial to the drying of the material particles in the spray drying tower. In the existing kiln, a large amount of heat in the high-temperature flue gas is directly discharged into the external flue gas during the combustion operation and cannot be effectively utilized, resulting in a huge waste of energy and reducing the utilization rate of the waste heat of the kiln flue gas.

[0005] Therefore, it is necessary to design and transform the kiln to effectively prevent the problem that a large amount of heat in the high-temperature flue gas is directly discharged into the external flue gas during the combustion operation of the kiln and cannot be effectively utilized, resulting in a huge waste of energy. Summary of the Invention

[0006] To solve the problems raised in the above background art, the purpose of the present invention is to provide a system for using the waste heat of a kiln for material drying, which has the advantages of waste heat utilization of flue gas, and solves the problem that a large amount of heat in the high-temperature flue gas is directly discharged into the external flue gas during the combustion operation of the kiln and cannot be effectively utilized, resulting in a huge waste of energy.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a system for using waste heat from a kiln for drying materials, comprising: A kiln body, wherein the kiln body is composed of a combustion chamber, a ventilation duct and a smoke exhaust duct; A fin-tube heat exchanger, a heat exchange pipe, a pressure pump and a valve are installed outside the smoke exhaust pipe, and one end of the heat exchange pipe is connected to a drying mechanism.

[0008] As a preferred embodiment of the present invention, the drying mechanism includes a dryer, a conveyor belt, a heating plate, a fan and a dehumidifier unit, one end of the heat exchange pipe is connected to the dryer, the dryer is composed of a conveyor belt, a heating plate, a fan and a dehumidifier unit, and a monitoring mechanism is installed inside the fin-tube heat exchanger.

[0009] As a preferred embodiment of the present invention, the monitoring mechanism includes a temperature sensor, a flow sensor and a controller, the temperature sensor and the flow sensor are installed inside the fin-tube heat exchanger, the controller is installed outside the kiln body, and the temperature sensor and the flow sensor are connected to the controller via electrical signals.

[0010] As a preferred embodiment of the present invention, a fin-tube heat exchanger is installed on the smoke exhaust pipe of the kiln body. The fin-tube heat exchanger has a high heat transfer efficiency and can effectively transfer the heat in the smoke to the heat exchange pipe.

[0011] As a preferred embodiment of the present invention, the heat exchange pipe flows into the interior of the dryer along the heat exchange pipe under the action of a pressure pump, and the pressure pump provides sufficient pressure to ensure that the heat medium can overcome the resistance of the heat exchange pipe and be stably transported to the interior of the dryer.

[0012] As a preferred embodiment of the present invention, a temperature sensor and a flow sensor are installed on the fin-tube heat exchanger to monitor the temperature and flow of the heat medium in real time. These data are fed back to the controller through electrical signals so that the flow and temperature of the heat medium can be accurately controlled by adjusting the opening of the valve according to the actual needs of material drying.

[0013] As a preferred embodiment of the present invention, the conveyor belt extends from the outside to the inside of the dryer, and the conveyor belt conveys the material to be dried into the inside of the dryer. The material will be evenly distributed in the drying channel to ensure full contact with the heat medium to achieve uniform drying.

[0014] As a preferred embodiment of the present invention, the heating plate inside the dryer blows airflow to circulate inside the dryer under the action of the fan, and fully exchanges heat with the surface of the material to evaporate the moisture in the material.

[0015] Preferably, in the present invention, the dryer discharges the wet air generated during the drying process through a duct by a blower. The air volume of the blower needs to be reasonably configured according to the size of the drying device and the drying speed of the material to ensure that the wet air can be discharged in time and the humidity balance of the drying environment can be maintained.

[0016] Preferably, in the present invention, the dehumidification unit recovers part of the heat and moisture in the wet air discharged from the dryer through condensation dehumidification and adsorption dehumidification, improving the energy utilization rate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Through the settings of the finned tube heat exchanger, heat exchange pipeline, pressure pump and valve, the present invention enables the finned tube heat exchanger to transfer the heat in the flue gas to the heat exchange pipeline. At this time, the pressure pump works to accelerate the airflow inside the heat exchange pipeline, and the airflow enters the dryer through the valve to heat and dry the material, thereby realizing the waste heat utilization of the flue gas discharged from the kiln body and avoiding the waste of resources caused by the inability to convert the heat of the flue gas discharged from the kiln body.

[0018] 2. Through the setting of the drying mechanism, the present invention enables the material to be dried to be sent into the dryer through the conveyor belt. Inside the dryer, the material will be evenly distributed in the drying channel. At this time, the heating plate works to generate heat radiation, and the blower blows the airflow through the heating plate to make the hot air circulate inside the dryer, and fully exchanges heat with the surface of the material, so that the moisture in the material evaporates, thereby realizing the self-completion of the drying operation and avoiding the uneven drying of the material inside the dryer by external heat, which affects the working efficiency.

[0019] 3. Through the setting of the monitoring mechanism, the present invention enables the temperature sensor and the flow sensor to monitor the temperature and flow of the finned tube heat exchanger in real time. The monitored data will be fed back to the inside of the controller through electrical signals, and the controller will adjust the opening degree of the valve according to the actual heat transmitted by the finned tube heat exchanger to accurately control the flow and temperature of the heat medium, thereby realizing the monitoring of the flue gas waste heat conversion and avoiding the inability to control the heat flow of the finned tube heat exchanger during use, resulting in overheating and affecting the drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural framework diagram of the present invention.

[0021] In the figure: 1. Kiln body; 2. Exhaust pipe; 3. Finned tube heat exchanger; 4. Heat exchange pipeline; 5. Pressure pump; 6. Valve; 7. Drying mechanism; 71. Dryer; 72. Conveyor belt; 73. Heating plate; 74. Blower; 75. Dehumidification unit; 8. Monitoring mechanism; 81. Temperature sensor; 82. Flow sensor; 83. Controller. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0023] As shown Figure 1 in the figure, a system for using the waste heat of a kiln furnace for material drying provided by the present invention includes; A kiln furnace body 1, which is composed of a combustion chamber, a ventilation duct and a smoke exhaust duct 2; A finned tube heat exchanger 3, a heat exchange pipe 4, a pressure pump 5 and a valve 6 are installed outside the smoke exhaust duct 2, and one end of the heat exchange pipe 4 is communicated with a drying mechanism 7.

[0024] Referring Figure 1 to the figure, the drying mechanism 7 includes a dryer 71, a conveyor belt 72, a heating plate 73, a blower 74 and a dehumidification unit 75. One end of the heat exchange pipe 4 is communicated with the dryer 71. The dryer 71 is composed of a conveyor belt 72, a heating plate 73, a blower 74 and a dehumidification unit 75. A monitoring mechanism 8 is installed inside the finned tube heat exchanger 3.

[0025] As a technical optimization scheme of the present invention, through the setting of the drying mechanism 7, the conveyor belt 72 can transport the material into the dryer 71, and then the dryer 71 works in cooperation with the heating plate 73 to generate heat radiation. During the working process of the heating plate 73, the blower 74 is used to blow the air flow through the heating plate 73, so that the hot air circulates inside the dryer 71, thereby realizing the independent drying process and avoiding the slow drying efficiency of the dryer 71 affecting the processing efficiency.

[0026] Referring Figure 1 to the figure, the monitoring mechanism 8 includes a temperature sensor 81, a flow sensor 82 and a controller 83. The temperature sensor 81 and the flow sensor 82 are installed inside the finned tube heat exchanger 3, and the controller 83 is installed outside the kiln furnace body 1. The temperature sensor 81 and the flow sensor 82 are connected to the controller 83 through electrical signals.

[0027] As a technical optimization solution of the present invention, through the setting of the monitoring mechanism 8, the controller 83 can analyze and process the data collected by the temperature sensor 81 and the flow sensor 82, compare it with the preset parameter values. If a certain parameter deviates from the set value, the controller 83 will issue corresponding control instructions according to the preset control strategy, so as to realize the real-time monitoring of temperature and flow, and avoid the influence of the finned tube heat exchanger 3 on the dryer 71 due to the uncontrollable flow temperature during the heat conversion process.

[0028] Reference Figure 1 , a finned tube heat exchanger 3 is installed on the smoke exhaust pipe 2 of the kiln body 1. The finned tube heat exchanger 3 has a high heat transfer efficiency and can effectively transfer the heat in the flue gas to the heat exchange pipe 4.

[0029] As a technical optimization solution of the present invention, through the setting of the finned tube heat exchanger 3, the hot fluid can flow inside the tube, and the cold fluid can flow transversely outside the tube over the finned tubes. Due to the existence of the fins, the heat transfer area outside the tube is increased, making the heat exchange between the cold fluid and the hot fluid more sufficient. The hot fluid transfers heat to the fins through the tube wall, and then the fins dissipate the heat to the surrounding cold fluid. In this process, the fins not only increase the heat transfer area but also strengthen the convective heat transfer of the fluid, thereby improving the overall heat transfer efficiency of the finned tube heat exchanger 3.

[0030] Reference Figure 1 , under the action of the pressure pump 5, the heat exchange pipe 4 flows along the heat exchange pipe 4 into the interior of the dryer 71. The pressure pump 5 provides sufficient pressure to ensure that the heat medium can overcome the resistance of the heat exchange pipe 4 and be stably transported into the interior of the dryer 71.

[0031] As a technical optimization solution of the present invention, through the setting of the pressure pump 5, it can promote the air fluid circulation inside the heat exchange pipe 4 to ensure the stable operation of the system, and avoid the slow flow of air inside the heat exchange pipe 4 due to obstruction, which cannot achieve the drying effect.

[0032] Reference Figure 1 , a temperature sensor 81 and a flow sensor 82 are installed on the finned tube heat exchanger 3 to monitor the temperature and flow of the heat medium in real time. These data will be fed back to the controller 83 through electrical signals, so as to accurately control the flow and temperature of the heat medium by adjusting the opening degree of the valve 6 according to the actual needs of material drying.

[0033] As a technical optimization solution of the present invention, by setting the temperature sensor 81 and the flow sensor 82, parameters such as the flue gas temperature, heat medium temperature and flow rate, material drying temperature and humidity, and air humidity in the dryer 71 discharged from the kiln body 1 can be monitored in real time. The collected data is converted into electrical signals and transmitted to the controller 83 for analysis and processing. When compared with the preset parameter values, if a certain parameter deviates from the set value, the controller 83 will issue corresponding control instructions according to the preset control strategy.

[0034] Reference Figure 1 , the conveyor belt 72 extends from the outside to the inside of the dryer 71. The conveyor belt 72 feeds the material to be dried into the inside of the dryer 71, and the material will be evenly distributed in the drying channel to ensure full contact with the heat medium and achieve uniform drying.

[0035] As a technical optimization solution of the present invention, by setting the conveyor belt 72, the material can be transported into the inside of the dryer 71, avoiding the phenomenon of overheating and spontaneous combustion of the material staying in the dryer 71 for a long time.

[0036] Reference Figure 1 , the heating plate 73 inside the dryer 71 blows the air flow to circulate inside the dryer 71 under the action of the fan 74, and fully exchanges heat with the surface of the material to evaporate the moisture in the material.

[0037] As a technical optimization solution of the present invention, by setting the heating plate 73 and the fan 74, the heating plate 73 can work to generate heat radiation to heat the inside of the dryer 71, and the fan 74 works to blow the air flow through the heating plate 73 to make the air circulate inside the dryer 71, realizing uniform drying and heating.

[0038] Reference Figure 1 , the dryer 71 discharges the wet air generated during the drying process through the air duct by the fan 74. The air volume of the fan 74 needs to be reasonably configured according to the size of the drying device and the material drying speed to ensure that the wet air can be discharged in time and maintain the humidity balance of the drying environment.

[0039] As a technical optimization solution of the present invention, by setting the dryer 71, it can assist the fan 74 to work and at the same time play the role of dehumidification and ventilation, avoiding the situation that the wet air inside the dryer 71 cannot be discharged, which greatly reduces the drying effect.

[0040] Reference Figure 1 , the dehumidification unit 75 recovers part of the heat and moisture in the wet air discharged from the dryer 71 through condensation dehumidification and adsorption dehumidification, improving the energy utilization rate.

[0041] As a technical optimization solution of the present invention, the setting of the dehumidification unit 75 can assist the dryer 71 to work, and at the same time play a role in recycling, avoiding waste of resources caused by the inability to utilize the wet air discharged from the dryer 71.

[0042] Working principle and usage process of the present invention: When in use, a suitable finned tube heat exchanger 3 is installed on the smoke exhaust pipe 2 of the furnace body 1. The finned tube heat exchanger 3 has a high heat transfer efficiency and can effectively transfer the heat in the flue gas to the heat medium. The heat medium exchanges heat with the high-temperature flue gas in the finned tube heat exchanger 3, and the heat of the flue gas is transferred to the heat exchange pipe 4, causing its temperature to rise. The amount of heat absorbed by the heat exchange pipe 4 can be controlled by adjusting its flow rate and residence time in the finned tube heat exchanger 3. Then, under the action of the pressure pump 5, it flows along the heat exchange pipe 4 from the finned tube heat exchanger 3 into the dryer 71. The pressure pump 5 provides sufficient pressure to ensure that the hot air can overcome the resistance of the heat exchange pipe 4 and be stably transported into the dryer 71. Together with the temperature sensor 81 and flow sensor 82 installed on the finned tube heat exchanger 3, the temperature and flow rate of the heat medium are monitored in real time, and the data is fed back to the controller 83. The controller 83 can accurately control the flow rate and temperature of the heat medium by adjusting the opening degree of the valve 6 according to the actual needs of material drying. The controller 83 analyzes and processes the collected data and compares it with the preset parameter values. If a certain parameter deviates from the set value, the controller 83 will issue corresponding control instructions according to the preset control strategy. Finally, the material to be dried is sent into the dryer 71 through the conveyor belt 72. The material in the dryer 71 will be evenly distributed in the drying channel to ensure full contact with the heat medium and achieve uniform drying. At this time, the heating plate 73 actively works to generate heat radiation, and the fan 74 blows the air flow through the heating plate 73, so that the hot air will circulate in the dryer 71 under the action of the fan 74 and conduct full heat exchange with the surface of the material, causing the moisture in the material to evaporate. At this time, the wet air generated during the drying process is discharged from the dryer 71 through the air duct under the action of the fan 74. The air volume of the fan 74 needs to be reasonably configured according to the material drying speed of the dryer 71 to ensure that the wet air can be discharged in time and maintain the humidity balance of the drying environment. The discharged wet air is dehumidified by using condensation dehumidification and adsorption dehumidification methods to recover part of the heat and moisture in the wet air and further improve the energy utilization efficiency of the system.

[0043] In summary: For the system that utilizes the waste heat of the kiln for material drying, through the combined use of the kiln body 1, the smoke exhaust pipe 2, the finned tube heat exchanger 3, the heat exchange pipe 4, the pressure pump 5, the valve 6, and the drying mechanism 7, during operation, the finned tube heat exchanger 3 transfers the heat in the flue gas to the heat exchange pipe 4. At this time, the pressure pump 5 operates to accelerate the airflow inside the heat exchange pipe 4, and the airflow enters the inside of the dryer 71 through the valve 6 to heat and dry the material, thereby realizing the utilization of the waste heat of the flue gas discharged from the kiln body 1, avoiding the waste of resources caused by the inability to convert the heat of the flue gas discharged from the kiln body 1, and solving the problem that a large amount of heat in the high-temperature flue gas directly discharged into the external flue gas during the combustion operation of the existing kiln fails to be effectively utilized, resulting in a huge waste of energy.

[0044] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A system for using the waste heat of a kiln for material drying, comprising: A kiln body (1), which is composed of a combustion chamber, a ventilation duct, and a smoke exhaust duct (2); It is characterized in that; an finned tube heat exchanger (3), a heat exchange pipe (4), a pressure pump (5), and a valve (6) are installed outside the smoke exhaust duct (2), and one end of the heat exchange pipe (4) is connected to a drying mechanism (7).

2. The system for drying materials using the waste heat of a kiln furnace according to claim 1, wherein: The drying mechanism (7) includes a dryer (71), a conveyor belt (72), a heating plate (73), a fan (74), and a dehumidification unit (75). One end of the heat exchange pipe (4) is connected to the dryer (71). The dryer (71) is composed of a conveyor belt (72), a heating plate (73), a fan (74), and a dehumidification unit (75). A monitoring mechanism (8) is installed inside the finned tube heat exchanger (3).

3. The system for drying materials using the waste heat of a kiln furnace according to claim 2, characterized in that: The monitoring mechanism (8) includes a temperature sensor (81), a flow sensor (82), and a controller (83). A temperature sensor (81) and a flow sensor (82) are installed inside the finned tube heat exchanger (3). A controller (83) is installed outside the kiln body (1). The temperature sensor (81) and the flow sensor (82) are connected to the controller (83) through electrical signals.

4. A system for using the waste heat of a kiln for drying materials according to claim 1, characterized in that: An finned tube heat exchanger (3) is installed on the smoke exhaust duct (2) of the kiln body (1). The finned tube heat exchanger (3) has a high heat transfer efficiency and can effectively transfer the heat in the flue gas to the heat exchange pipe (4).

5. A system for using the waste heat of a kiln for drying materials according to claim 2, characterized in that: Under the action of the pressure pump (5), the heat exchange pipe (4) flows along the heat exchange pipe (4) into the dryer (71). The pressure pump (5) provides sufficient pressure to ensure that the heat medium can overcome the resistance of the heat exchange pipe (4) and be stably transported into the dryer (71).

6. A system for using the waste heat of a kiln furnace for material drying according to claim 3, characterized in that: A temperature sensor (81) and a flow sensor (82) are installed on the finned tube heat exchanger (3) to monitor the temperature and flow of the heat medium in real time. These data will be fed back to the controller (83) through electrical signals, so as to accurately control the flow and temperature of the heat medium by adjusting the opening of the valve (6) according to the actual needs of material drying.

7. The system for drying materials using the waste heat of a kiln furnace according to claim 2, characterized in that: The conveyor belt (72) extends from the outside into the dryer (71). The conveyor belt (72) feeds the material to be dried into the dryer (71). The material will be evenly distributed in the drying channel to ensure full contact with the heat medium and achieve uniform drying.

8. A system for drying materials using the waste heat of a kiln furnace according to claim 2, characterized in that: The heating plate (73) inside the dryer (71) blows air flow to circulate inside the dryer (71) under the action of the fan (74) and conducts full heat exchange with the surface of the material, so that the moisture in the material evaporates.

9. A system for using the waste heat of a kiln for material drying according to claim 2, characterized in that: The dryer (71) discharges the wet air generated during the drying process through the air duct through the fan (74). The air volume of the fan (74) needs to be reasonably configured according to the size of the drying device and the material drying speed to ensure that the wet air can be discharged in time and maintain the humidity balance of the drying environment.

10. A system for using the waste heat of a kiln for material drying according to claim 2, characterized in that: The dehumidification unit (75) recovers part of the heat and moisture in the wet air discharged from the dryer (71) through condensation dehumidification and adsorption dehumidification, improving the energy utilization rate.

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