CN111578674A - Drying line heating system - Google Patents

Drying line heating system Download PDF

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Publication number
CN111578674A
CN111578674A CN202010563109.1A CN202010563109A CN111578674A CN 111578674 A CN111578674 A CN 111578674A CN 202010563109 A CN202010563109 A CN 202010563109A CN 111578674 A CN111578674 A CN 111578674A
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CN
China
Prior art keywords
air
drying
pipe
heat
connecting piece
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Pending
Application number
CN202010563109.1A
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Chinese (zh)
Inventor
王杰
邓立锋
刘安阳
陈春兴
何伟
张深根
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Jiangsu Longjing Kejie Environmental Protection Technology Co ltd
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Jiangsu Longjing Kejie Environmental Protection Technology Co ltd
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Priority to CN202010563109.1A priority Critical patent/CN111578674A/en
Publication of CN111578674A publication Critical patent/CN111578674A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
    • F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0405—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using electric energy supply, e.g. the heating medium being a resistive element; Heating by direct contact, i.e. with resistive elements, electrodes and fins being bonded together without additional element in-between
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H3/00—Air heaters
    • F24H3/02—Air heaters with forced circulation
    • F24H3/04—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element
    • F24H3/0488—Air heaters with forced circulation the air being in direct contact with the heating medium, e.g. electric heating element using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1863—Arrangement or mounting of electric heating means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/18—Arrangement or mounting of grates or heating means
    • F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
    • F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
    • F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B15/00—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form
    • F26B15/10—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions
    • F26B15/12—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined
    • F26B15/18—Machines or apparatus for drying objects with progressive movement; Machines or apparatus with progressive movement for drying batches of material in compact form with movement in a path composed of one or more straight lines, e.g. compound, the movement being in alternate horizontal and vertical directions the lines being all horizontal or slightly inclined the objects or batches of materials being carried by endless belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity

Abstract

The invention provides a drying line heating system which comprises an air duct heater, a burner, a hot blast stove and a fan, wherein the burner and the hot blast stove are assembled into a whole, the air duct heater and the hot blast stove are connected with an air supply pipe and an air return pipe respectively through electric air valves in a parallel connection mode, the air supply pipe and the air return pipe extend to a drying space surrounded by a heat insulation structure body on a conveying line, and the fan sends air in the drying space to the air duct heater or the hot blast stove through the air return pipe and then sends the air back to the drying space through the air supply pipe after the air is heated. The air duct heater and the hot blast stove are connected in parallel, the hot blast stove is used for combustion heating in the daytime, and the air duct heater with the built-in electric heating pipe is used for heating at night, so that peak staggering power utilization can be realized, and the production cost is reduced; the equipment can be mutually standby, can overhaul and handle under the condition of not stopping production, and the equipment is outside the stoving space, and operational environment is better, can improve equipment's life, has also improved maintenance personal working condition.

Description

Drying line heating system
Technical Field
The invention relates to the technical field of drying processes in industrial production, in particular to a drying line heating system.
Background
The drying line can be used for drying various materials with certain humidity or granularity, and the drying line equipment has the characteristics of reasonable structure, excellent manufacture, simple and reliable operation, high yield, convenient operation and the like, so the drying line equipment is widely applied in industry.
The drying line is generally used for dehumidifying materials by heating and raising the temperature, the drying line can adopt various heating modes, electric heating is one of the more common modes, and for example, the existing catalyst drying line in our factory adopts an electric heating pipe for heating.
The drying line adopts an electric heating mode to increase the power supply load, waste the electric resources, have higher operation cost and particularly have more expensive electric charge in the daytime; the heating equipment is inconvenient to maintain and repair, and production must be stopped and repaired when a fault occurs, so that production is influenced. Therefore, it is necessary to modify both the heating method and the equipment.
Disclosure of Invention
In order to solve the technical problems, through careful research and certification, the invention provides a drying line heating system which comprises an air duct heater, a burner, a hot blast stove and a fan, wherein the burner and the hot blast stove are assembled into a whole, the air duct heater and the hot blast stove are connected with an air supply pipe and a return air pipe respectively through electric air valves in a parallel connection mode, the air supply pipe and the return air pipe extend to a drying space surrounded by a heat insulation structure body on a conveying line, and the fan sends air in the drying space to the air duct heater or the hot blast stove through the return air pipe to be heated and then sends the air back to the drying space through the air supply pipe.
Optionally, an electric heating pipe is arranged inside the air duct heater.
Optionally, the combustor is of a gas type and a gas interface thereof is connected with a natural gas supply pipeline.
Optionally, the drying space is provided with a plurality of air return inlets and air supply outlets, and the air return inlets are spaced from each other and uniformly arranged on the side wall of the heat insulation structure; the air supply outlets are mutually spaced and uniformly arranged at the top of the heat insulation structure; the return air pipe is provided with a plurality of return air branch pipes which are respectively connected with the return air inlets, and the air supply pipe is provided with a plurality of air supply branch pipes which are respectively connected with the air supply outlets.
Optionally, the air duct heater and the hot blast stove share a fan, and the fan is mounted on the return air duct.
Optionally, the heating system is provided with a dehumidification assembly, the dehumidification assembly comprises an air conditioner, a throttle valve, an evaporator and a condenser, the air conditioner is internally provided with a compressor, the compressor is sequentially connected with the condenser, the throttle valve and the evaporator in series by adopting pipelines to form a refrigeration cycle, the evaporator and the condenser are both arranged on a return air pipe, the evaporator is arranged on the outer side surface of the return air pipe, a drainage channel is arranged below the evaporator, and the drainage channel is connected with a drainage pipe; the return air of the drying space firstly passes through the evaporator, then passes through the condenser and then reaches the fan, and is sent to the air channel heater or the hot blast stove by the fan to be heated, and then is sent back to the drying space through the blast pipe.
Optionally, the heat preservation of insulation structure adopts high temperature resistant and fireproof rock wool material to make, insulation structure is equipped with feed inlet and discharge gate, the transfer chain penetrates insulation structure from the feed inlet, wears out from the discharge gate.
Optionally, the return air duct and the blast pipe are made of galvanized steel sheets, the outer sides of the duct walls of the return air duct and the blast pipe are both provided with a heat preservation layer and a protection layer, the heat preservation layer is made of high-temperature-resistant and fireproof rock wool boards and is adhered to the outer side of the duct walls, and the protection layer is made of high-temperature-resistant tinfoil paper materials and is laid outside the heat preservation layer.
Optionally, the drying device further comprises a controller, temperature sensors are arranged in the drying space and the air supply pipe, and the controller is connected with the temperature sensors, the electric air valve, the electric heating pipe, the burner and the fan respectively.
Optionally, the controller switches to dry and heat by using natural gas combustion heat in the daytime, a gas control valve is arranged on the natural gas supply pipe, and the control strategy of the controller is as follows:
firstly, an inlet and an outlet of a drying space on a conveying line are provided with electronic scales, an infrared thermometer is further arranged at the inlet to measure the temperature of materials, the electronic scales and the infrared thermometer are connected with a controller and transmit measured data to the controller, and the heat supply requirement of the drying space is calculated by adopting the following preset algorithm:
Q＝cwater (W)*(m1-m2)*n*(t2-t1)+(m1-m2)*n*qWater (W)+qDecrease in the thickness of the steel
Wherein Q represents the heat quantity which needs to be supplied by the blast pipe in the drying space; c. CWater (W)Represents the specific heat capacity of water; m is1Representing the mass of the material before drying; m is2Representing the quality of the dried material; n represents the quantity of the materials entering the drying space in unit time; t is t2Representing the air temperature of the material before the material is discharged out of the drying space and the air temperature of the material before the material is discharged out of the drying space, and the air temperature are considered to be equal; t is t1Representing the temperature of the material before entering the drying space; q. q.sWater (W)Latent heat of vaporization per unit mass of water; q. q.sDecrease in the thickness of the steelHeat representing heat loss of the blast pipe and the heat insulation structure;
secondly, calculating the supply amount of the natural gas according to the heat demand, and adjusting a gas control valve according to the supply amount of the natural gas:
Figure BDA0002546760460000031
wherein, VQi (Qi)Representing the natural gas supply in m3；qBurning deviceExpressing nature per unit volumeHeat generated by combustion of the gas;
and finally, calculating the air volume of the fan according to the heat demand, and adjusting the rotating speed of the fan according to the relation between the air volume and the rotating speed:
Figure BDA0002546760460000032
wherein, VAir conditionerRepresenting the air quantity of a fan; c. CAir conditionerRepresents the specific heat capacity of air; rhoAir conditionerRepresents the density of air; t is t3Showing the temperature of the air supplied by the air supply duct.
Optionally, the combustor and the hot-blast stove are assembled by using a connecting assembly, the connecting assembly comprises a first connecting piece, a second connecting piece and a sealing sleeve, the second connecting piece is fixedly connected with the hot-blast stove, the first connecting piece is fixedly connected with the combustor, the first connecting piece is connected in the second connecting piece in a floating manner, the sealing sleeve blocks a floating gap position between the first connecting piece and the second connecting piece, the inner edge of the sealing sleeve is hermetically connected with the first connecting piece, the second connecting piece is provided with a second connecting piece connecting surface used for being connected with the sealing sleeve, the outer edge of the sealing sleeve is connected onto the second connecting piece connecting surface by a bolt and a first pressing plate, the outer edge or the inner edge of the first pressing plate is provided with an outer limiting structure extending towards the second connecting piece connecting surface and used for limiting the compression deformation of the sealing rubber, the outer limiting structure is an outer turning edge arranged at the outer edge of the first pressing plate, the outer turning edge is provided with an inner circumferential surface used for blocking the sealing sleeve in the radial outward direction, the turning edge arranged at the inner edge of the annular pressing plate is an inner turning edge, the annular pressing plate with the inner turning edge is a second pressing plate, the inner turning edge extends from the inner edge of the second pressing plate to the sealing connecting surface, a certain gap is formed between the front end of the inner turning edge and the fixed base body, when the annular pressing plate is subjected to excessive extrusion force, the front end of the inner turning edge of the annular pressing plate is pushed against the fixed base body to form blocking matching, and the outer side of the annular pressing plate is tightly pushed by a bolt to form pushing matching.
The invention adopts an external heating structure with an air duct heater and a hot blast stove connected in parallel, leads out air in a drying space through a return air duct and a fan, heats the air to the air duct heater or the hot blast stove connected in parallel, and then sends the air back to the drying space through an air supply pipe, thereby realizing hot air circulation and centralized heat supply. The air duct heater and the hot blast stove are connected in parallel, the hot blast stove is used for combustion heating in the daytime, and the air duct heater with the built-in electric heating pipe is used for heating at night, so that peak staggering power utilization can be realized, and the production cost is reduced. The external heating equipment and the parallel connection are combined to play a mutual standby role, when a certain heating equipment breaks down, another heating equipment can be started, the fault equipment is overhauled and processed under the condition of not stopping production, the equipment is outside the drying space, the working environment is good, the service life of the equipment can be prolonged, and the working condition of maintenance personnel is also improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a top view of a drying line heating system according to an embodiment of the present invention;
FIG. 2 is a front view of an embodiment of the drying line heating system of FIG. 1;
FIG. 3 is a right side view of the gas fired heating section of the drying line heating system embodiment of FIG. 2;
FIG. 4 is a right side view of a heating and blowing duct of an embodiment of the drying line heating system;
FIG. 5 is a top view of a heating and blower tube of the embodiment of the mainline heating system of FIG. 4;
FIG. 6 is a right side view of a heating and return duct of an embodiment of the drying line heating system;
FIG. 7 is a top view of the heating and return ducts of the embodiment of the drying line heating system of FIG. 6;
FIG. 8 is a schematic view of the connection assembly for assembling the burner and the hot blast stove.
In the figure: 1-air flue heater, 2-burner, 3-hot blast stove, 4-fan, 5-blast pipe, 6-return air pipe, 7-heat insulation structure, 8-drying space, 9-electric air valve, 10-temperature sensor, 11-air pressure switch, 12-conveying line, 13-driving motor, 14-first connecting piece, 15-second connecting piece, 16-sealing sleeve, 17-first pressing plate and 18-second pressing plate.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 1-7, the invention provides a drying line heating system, which comprises an air duct heater 1, a burner 2, a hot blast stove 3 and a fan 4, wherein the burner 2 and the hot blast stove 3 are assembled into a whole, the air duct heater 1 and the hot blast stove 3 are respectively connected with an air supply pipe 5 and a return air pipe 6 through an electric air valve 9 in a parallel connection mode, the air supply pipe 5 and the return air pipe 6 extend to a drying space 8 surrounded by a heat insulation structure on a conveying line 12, and the fan 4 supplies air in the drying space 8 to the air duct heater 1 or the hot blast stove 3 through the return air pipe 6 for heating and then supplies the air to the drying space through the air supply pipe 5.
The working principle of the technical scheme is as follows: the invention adopts an external heating structure with an air duct heater and a hot blast stove connected in parallel, leads out air in a drying space through a return air duct and a fan, heats the air to the air duct heater or the hot blast stove connected in parallel, and then sends the air back to the drying space through an air supply pipe, thereby realizing hot air circulation and centralized heat supply.
The beneficial effects of the above technical scheme are: the air duct heater and the hot blast stove are connected in parallel, the hot blast stove is used for combustion heating in the daytime, and the air duct heater with the built-in electric heating pipe is used for heating at night, so that peak staggering power utilization can be realized, and the production cost is reduced. The external heating equipment and the parallel connection are combined to play a mutual standby role, when a certain heating equipment breaks down, another heating equipment can be started, the fault equipment is overhauled and processed under the condition of not stopping production, the equipment is outside the drying space, the working environment is good, the service life of the equipment can be prolonged, and the working condition of maintenance personnel is also improved.
In one embodiment, an electric heating pipe is arranged inside the air duct heater 1; the combustor 2 is of a gas type, and a gas interface of the combustor is connected with a natural gas supply pipeline; the drying space 8 is provided with a plurality of air return ports and air supply ports, and the air return ports are mutually spaced and uniformly arranged on the side wall of the heat insulation structure body 7; the air supply outlets are mutually spaced and uniformly arranged at the top of the heat insulation structure body 7; the return air pipe 6 is provided with a plurality of return air branch pipes which are respectively connected with the return air inlets, and the blast pipe 5 is provided with a plurality of blast branch pipes which are respectively connected with the blast inlets.
The working principle and the beneficial effects of the technical scheme are as follows: according to the size of the drying space, the number, the spacing and the layout of the air supply outlets and the air return inlets are set so as to ensure that a temperature field (temperature distribution) in the drying space is relatively balanced and parts with large temperature difference can not exist; the cross section size of each air supply branch pipe can be preset according to actual items, and the same cross section size is generally adopted, so that the distribution of air supply amount is favorably arranged; the section size of the return air branch pipe is also determined.
In one embodiment, the air flue heater 1 and the hot blast stove 3 share a fan 4, and the fan 4 is arranged on a return air pipe 6; the heating system is provided with a dehumidification assembly, the dehumidification assembly comprises an air conditioner, a throttle valve, an evaporator and a condenser, a compressor is arranged in the air conditioner, the compressor is sequentially connected with the condenser, the throttle valve and the evaporator in series through pipelines to form a refrigeration cycle, the evaporator and the condenser are both arranged on a return air pipe 6, the evaporator and the condenser are arranged on the outer side surface of the return air pipe 6, a drainage groove is arranged below the evaporator, and the drainage groove is connected with a drainage pipe; the return air of the drying space 8 firstly passes through the evaporator, then passes through the condenser and then reaches the fan 4, is sent to the air channel heater 1 or the hot blast stove 3 by the fan 4 for heating, and then is sent back to the drying space 8 through the blast pipe 5.
The working principle of the technical scheme is as follows: the air conditioner in the dehumidification assembly is provided with a compressor, the compressor is started to start refrigeration cycle, high-temperature and high-pressure gaseous refrigerants discharged by the compressor flow to the condenser, are cooled in the condenser to become high-pressure liquid, then are reduced in pressure by the throttle valve to become low-temperature and low-pressure liquid refrigerants, then flow into the evaporator to be evaporated into low-temperature and low-pressure gaseous refrigerants, and finally flow back to the compressor to form a complete refrigerant circulation loop. When low-temperature low-pressure liquid refrigerant is evaporated in the evaporator, heat needs to be absorbed from flowing return air, so that the temperature of the return air is reduced to exceed a saturation point, the water-containing capacity of the return air is reduced, most of moisture in the return air containing more moisture in a drying space is condensed into liquid water, and the liquid water falls into a drainage groove below the evaporator and is discharged out of a drainage pipe, so that the aim of dehumidification is fulfilled; the dehumidified return air has low temperature, and when passing through the condenser, the return air exchanges heat with the high-temperature refrigerant to cool the high-temperature gaseous refrigerant into liquid, and the heat of the refrigerant absorbed by the return air is increased to form a heat recovery effect.
The beneficial effects of the above technical scheme are: the dehumidification component is arranged, so that the air humidity of the drying space is reduced, the drying of the materials is accelerated, and the drying efficiency is improved; in addition, the evaporator and the condenser of the dehumidification assembly are arranged on the air return pipe, return air is cooled and dehumidified firstly, then the temperature of the return air is raised through the same refrigeration cycle, a heat recovery effect is formed, the heat of dehumidification cannot be lost and wasted, the heat is recycled through the condenser, the energy consumption loss of dehumidification is avoided, and the dehumidification purpose is achieved and energy can be saved.
In one embodiment, the heat insulation layer of the heat insulation structure 7 is made of rock wool material which is high temperature resistant and fireproof, the heat insulation structure 7 is provided with a feeding hole and a discharging hole, the conveying line 12 penetrates into the heat insulation structure from the feeding hole and penetrates out from the discharging hole, the conveying line 12 is driven by the driving motor 13, and the conveying line conveys materials into the drying space 8 from the feeding hole and moves the materials out from the discharging hole after drying.
The working principle and the beneficial effects of the technical scheme are as follows: the materials are put on the conveying line and sent into the drying space, and the materials are moved out by the conveying line after being dried, so that the production efficiency is improved by the automatic drying production arrangement; the heat preservation layer of the heat preservation structure body is made of high-temperature-resistant and fireproof rock wool materials, and fire disasters can be prevented on the basis of heat preservation.
In one embodiment, the return air duct 6 and the blast duct 5 are made of galvanized steel sheets, the outer sides of the duct walls of the return air duct 6 and the blast duct 5 are both provided with a heat insulation layer and a protection layer, the heat insulation layer is adhered to the outer side of the duct wall by a high temperature resistant and fireproof rock wool board, and the protection layer is laid outside the heat insulation layer by a high temperature resistant tinfoil paper material.
The working principle and the beneficial effects of the technical scheme are as follows: the return air pipe and the blast pipe are made of galvanized steel plate materials and can resist high temperature, and the heat loss in hot air circulation can be reduced by arranging the heat preservation layer on the air pipe, so that heat waste is prevented, and energy consumption and cost are saved.
In one embodiment, the drying device further comprises a controller, the controller is fixed on the outer side wall of the heat insulation structure body 7, temperature sensors 10 are arranged in the drying space 8 and the air supply pipe 5, and the controller is respectively connected with the temperature sensors 10, the electric air valve 9, the electric heating pipe, the combustor 2 and the fan 4.
The working principle of the technical scheme is as follows: when the combustion heating is adopted in the daytime, the controller controls the electric heating pipe in the air duct heater to be powered off, the electric air valve connected with the air duct heater is closed, the electric air valve connected with the hot blast stove is opened, the burner and the fan are started, and the combustion heating is carried out through the temperature condition measured by the temperature sensor; the controller controls and switches to an electric heating pipe heating mode at night, an electric air valve connected with the hot blast stove is closed, an electric air valve connected with the air duct heater is opened, the burner stops running, the electric heating pipe in the air duct heater is electrified to convert electric energy into heat energy, the heat energy is sent into the drying space through hot air circulation, temperature control is carried out through the temperature sensor, heating is stopped when the temperature reaches the upper limit of a control range, and heating is restarted when the temperature is reduced to the lower limit.
The beneficial effects of the above technical scheme are: through the control of the controller, the switching between two different heating modes can be automatically realized, the control precision is improved, and the operation mode is stable.
In one embodiment, the controller switches to dry and heat by using natural gas combustion heat in the daytime, a gas control valve is arranged on the natural gas supply pipe, and the control strategy of the controller is as follows:
firstly, an electronic scale is arranged at the inlet and the outlet of the drying space 8 on the conveying line 12, an infrared thermometer is also arranged at the inlet to measure the temperature of the materials, the electronic scale and the infrared thermometer are connected with a controller and transmit the measured data to the controller, and the heat supply requirement of the drying space is calculated by adopting the following preset algorithm:
Q＝cwater (W)*(m1-m2)*n*(t2-t1)+(m1-m2)*n*qWater (W)+qDecrease in the thickness of the steel
Wherein Q represents the heat quantity which needs to be supplied by the blast pipe in the drying space; c. CWater (W)Represents the specific heat capacity of water; m is1Representing the mass of the material before drying; m is2Representing the quality of the dried material; n represents the quantity of the materials entering the drying space in unit time; t is t2Representing the air temperature of the material before the material is discharged out of the drying space and the air temperature of the material before the material is discharged out of the drying space, and the air temperature are considered to be equal; t is t1Representing the temperature of the material before entering the drying space; q. q.sWater (W)Latent heat of vaporization per unit mass of water; q. q.sDecrease in the thickness of the steelHeat representing heat loss of the blast pipe and the heat insulation structure;
secondly, calculating the supply amount of the natural gas according to the heat demand, and adjusting a gas control valve according to the supply amount of the natural gas:
Figure BDA0002546760460000081
wherein, VQi (Qi)Representing the natural gas supply in m3；qBurning deviceRepresenting the heat generated by the combustion of a unit volume of natural gas;
finally, calculating the air volume of the fan 4 according to the heat demand, and then adjusting the rotating speed of the fan 4 according to the relationship between the air volume and the rotating speed:
Figure BDA0002546760460000082
wherein, VAir conditionerRepresenting the air quantity of a fan; c. CAir conditionerRepresents the specific heat capacity of air; rhoAir conditionerRepresents the density of air; t is t3The temperature of the air supplied from the air supply duct 5 is shown.
The working principle and the beneficial effects of the technical scheme are as follows: by the control strategy, the operation of equipment can be accurately controlled according to the water content condition of the material and actual measurement data, so that the waste is reduced, and the energy consumption is reduced; the drying condition of the materials is predicted, the process quality of material drying can be improved, and insufficient drying is avoided.
In one embodiment, the burner 2 and the hot blast stove 3 are assembled by using a connecting assembly, the connecting assembly comprises a first connecting piece 14, a second connecting piece 15 and a sealing sleeve 16, the second connecting piece 15 is fixedly connected with the hot blast stove 3, the first connecting piece 14 is fixedly connected with the burner 2, the first connecting piece 14 is connected in the second connecting piece 15 in a floating manner, the sealing sleeve 16 is sealed at a floating gap position between the first connecting piece 14 and the second connecting piece 15, the inner edge of the sealing sleeve 16 is hermetically connected with the first connecting piece 14, the second connecting piece 15 is provided with a second connecting piece 15 connecting surface for being connected with the sealing sleeve 16, the outer edge of the sealing sleeve 16 is connected on the second connecting piece 15 connecting surface through a bolt and a first pressing plate 17, the outer edge or the inner edge of the first pressing plate 17 is provided with an outer limit structure which extends towards the second connecting piece 15 connecting surface and is used for limiting the compression deformation amount of the sealing, the outer limiting structure is an outer turning edge arranged at the outer edge of the first pressing plate 15, the outer turning edge is provided with an inner circumferential surface used for stopping the sealing sleeve in the radial outward direction, the turning edge arranged at the inner edge of the annular pressing plate is an inner turning edge, the annular pressing plate with the inner turning edge is a second pressing plate 18, the inner turning edge extends from the inner edge of the second pressing plate 18 to the sealing connecting surface, a certain gap is formed between the front end of the inner turning edge and the fixed base body, when the annular pressing plate is subjected to excessive extrusion force, the front end of the inner turning edge of the annular pressing plate is pushed against the fixed base body to form stop matching, and the outer side of the annular pressing plate is tightly pushed by bolts to form top pressing matching.
The working principle and the beneficial effects of the technical scheme are as follows: the connecting assembly is in floating connection with the second connecting piece through the first connecting piece, so that errors of a connecting part of the burner and the hot blast stove can be compensated, adjustment and matching are easy to achieve during installation, and assembly is convenient; the connection mode is convenient to disassemble and brings convenience to equipment maintenance. In addition, the state of the burner during combustion in the hot blast stove fluctuates, so that the pressure fluctuates, the floating connection mode can adapt to fluctuation changes, certain buffering is formed on the fluctuation of the pressure, the equipment is prevented from vibrating, noise reduction is facilitated, local deformation of the equipment can be prevented, equipment failure is avoided, the failure rate is effectively reduced, the maintenance cost is reduced, and the service life of the equipment is prolonged.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The utility model provides a stoving line heating system, its characterized in that, includes air duct heater, combustor, hot-blast furnace and fan, combustor and hot-blast furnace equipment become integrative, air duct heater and hot-blast furnace adopt parallel connection mode to be connected with blast pipe and return air duct respectively through electronic blast gate, blast pipe and return air duct extend to the stoving space that is enclosed by the insulation construction body on the transfer line, the fan passes through the return air duct and sends air in the stoving space to air duct heater or hot-blast furnace heating back, and the rethread blast pipe sends back the stoving space.
2. The drying line heating system according to claim 1, wherein an electric heating pipe is provided inside the duct heater.
3. Drying line heating system according to claim 1, characterized in that the burner is of the gas type and its gas interface is connected to a natural gas supply pipe.
4. The drying line heating system according to claim 1, wherein the drying space is provided with a plurality of air return openings and air supply openings, the air return openings being spaced apart from each other and uniformly arranged on a side wall of the heat insulating structure; the air supply outlets are mutually spaced and uniformly arranged at the top of the heat insulation structure; the return air pipe is provided with a plurality of return air branch pipes which are respectively connected with the return air inlets, and the air supply pipe is provided with a plurality of air supply branch pipes which are respectively connected with the air supply outlets.
5. The drying line heating system according to claim 4, wherein the duct heater and the hot blast stove share a fan, the fan being mounted on a return air duct.
6. The drying line heating system according to claim 5, wherein the heating system is provided with a dehumidifying component, the dehumidifying component comprises an air conditioner, a throttle valve, an evaporator and a condenser, the air conditioner is internally provided with a compressor, the compressor is sequentially connected with the condenser, the throttle valve and the evaporator in series by adopting pipelines to form a refrigerating cycle, the evaporator and the condenser are both arranged on a return air pipe, the evaporator is arranged on the outer side surface of the return air pipe, a water drainage tank is arranged below the evaporator, and the water drainage tank is connected with a water drainage pipe; the return air of the drying space firstly passes through the evaporator, then passes through the condenser and then reaches the fan, and is sent to the air channel heater or the hot blast stove by the fan to be heated, and then is sent back to the drying space through the blast pipe.
7. The drying line heating system according to claim 1, wherein the heat insulation layer of the heat insulation structure is made of high-temperature-resistant and fireproof rock wool, the heat insulation structure is provided with a feeding hole and a discharging hole, and the conveying line penetrates into the heat insulation structure from the feeding hole and penetrates out from the discharging hole.
8. The drying line heating system according to claim 2, further comprising a controller, wherein temperature sensors are disposed in the drying space and the air supply pipe, and the controller is connected to the temperature sensors, the electric air valve, the electric heating pipe, the burner and the fan.
9. The drying line heating system according to claim 8, wherein the controller switches to drying and heating by using combustion heat of natural gas during the day, a gas control valve is arranged on the natural gas supply pipe, and the control strategy of the controller is as follows:
firstly, an inlet and an outlet of a drying space on a conveying line are provided with electronic scales, an infrared thermometer is further arranged at the inlet to measure the temperature of materials, the electronic scales and the infrared thermometer are connected with a controller and transmit measured data to the controller, and the heat supply requirement of the drying space is calculated by adopting the following preset algorithm:
Q＝cwater (W)*(m1-m2)*n*(t2-t1)+(m1-m2)*n*qWater (W)+qDecrease in the thickness of the steel
Wherein Q represents the heat quantity which needs to be supplied by the blast pipe in the drying space; c. CWater (W)Represents the specific heat capacity of water; m is1Representing the mass of the material before drying; m is2Representing the quality of the dried material; n represents the quantity of the materials entering the drying space in unit time; t is t2Representing the air temperature of the material before the material is discharged out of the drying space and the air temperature of the material before the material is discharged out of the drying space, and the air temperature are considered to be equal; t is t1Representing the temperature of the material before entering the drying space; q. q.sWater (W)Latent heat of vaporization per unit mass of water; q. q.sDecrease in the thickness of the steelHeat representing heat loss of the blast pipe and the heat insulation structure;
secondly, calculating the supply amount of the natural gas according to the heat demand, and adjusting a gas control valve according to the supply amount of the natural gas:
Figure FDA0002546760450000021
wherein, VQi (Qi)Representing the natural gas supply in m3；qBurning deviceRepresenting the heat generated by the combustion of a unit volume of natural gas;
and finally, calculating the air volume of the fan according to the heat demand, and adjusting the rotating speed of the fan according to the relation between the air volume and the rotating speed:
Figure FDA0002546760450000022
wherein, VAir conditionerRepresenting the air quantity of a fan; c. CAir conditionerRepresents the specific heat capacity of air; rhoAir conditionerRepresents the density of air; t is t3Showing the temperature of the air supplied by the air supply duct.
10. The drying line heating system according to claim 1, wherein the burner and the hot blast stove are assembled by a connecting assembly, the connecting assembly comprises a first connecting piece, a second connecting piece and a sealing sleeve, the second connecting piece is fixedly connected with the hot blast stove, the first connecting piece is fixedly connected with the burner, the first connecting piece is connected in the second connecting piece in a floating manner, the sealing sleeve seals a floating gap position between the first connecting piece and the second connecting piece, an inner edge of the sealing sleeve is connected with the first connecting piece in a sealing manner, a second connecting piece connecting surface used for being connected with the sealing sleeve is arranged on the second connecting piece, an outer edge of the sealing sleeve is connected on the second connecting piece connecting surface through a bolt and a first pressing plate, an outer limit structure extending towards the second connecting piece connecting surface and used for limiting the compression deformation of the sealing rubber gasket is arranged at the outer edge or the inner edge of the first pressing plate, the outer limiting structure is an outer turning edge arranged at the outer edge of the first pressing plate, the outer turning edge is provided with an inner circumferential surface used for blocking the sealing sleeve in the radial outward direction, the turning edge arranged at the inner edge of the annular pressing plate is an inner turning edge, the annular pressing plate with the inner turning edge is a second pressing plate, the inner turning edge extends from the inner edge of the second pressing plate to the sealing connecting surface, a certain gap is formed between the front end of the inner turning edge and the fixed base body, when the annular pressing plate is subjected to excessive extrusion force, the front end of the inner turning edge of the annular pressing plate is pushed against the fixed base body to form blocking matching, and the outer side of the annular pressing plate is tightly pushed by a bolt to form pushing matching.
CN202010563109.1A 2020-06-19 2020-06-19 Drying line heating system Pending CN111578674A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113532084A (en) * 2021-06-22 2021-10-22 新疆宝明矿业有限公司 Oil shale drying equipment
CN114369714A (en) * 2020-12-29 2022-04-19 中冶长天国际工程有限责任公司 Lump ore pretreatment method and treatment system
CN114688863A (en) * 2022-04-27 2022-07-01 江苏龙净科杰环保技术有限公司 Novel catalyst drying system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114369714A (en) * 2020-12-29 2022-04-19 中冶长天国际工程有限责任公司 Lump ore pretreatment method and treatment system
CN114369714B (en) * 2020-12-29 2023-06-30 中冶长天国际工程有限责任公司 Block ore pretreatment method and treatment system
CN113532084A (en) * 2021-06-22 2021-10-22 新疆宝明矿业有限公司 Oil shale drying equipment
CN114688863A (en) * 2022-04-27 2022-07-01 江苏龙净科杰环保技术有限公司 Novel catalyst drying system

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