Drying line heating device and method
阅读说明：本技术 烘干线加热装置及方法 (Drying line heating device and method ) 是由 王杰 邓立锋 刘安阳 陈春兴 何伟 张深根 于 2020-06-22 设计创作，主要内容包括：本发明提供了一种烘干线加热装置,包括电加热管、运风马达、燃烧机、热风炉和风机,所述电加热管和运风马达间隔设置在输送线上方,所述电加热管、运风马达及两者下方的输送线被保温结构体包围,所述燃烧机和热风炉组装成一体,所述热风炉的进风口以回风管与保温结构体所包围的空间连通,所述热风炉的出风口以风道与风机的回风口连接,所述风机的送风口以送风管与保温结构体所包围的空间连通。本发明在原有电加热方式基础上进行改造,加设了燃烧加热方式,在白天电价较高时采用燃烧加热方式,在晚上采用原有电加热方式,两种方式按照设定时间进行切换控制,达到错峰用电的目的,与峰谷电价政策相适应,可以大大节省生产成本,平衡峰谷用电差异。(The invention provides a drying line heating device which comprises an electric heating pipe, an air conveying motor, a burner, a hot blast stove and a fan, wherein the electric heating pipe and the air conveying motor are arranged above a conveying line at intervals, the electric heating pipe, the air conveying motor and the conveying line below the electric heating pipe and the air conveying motor are surrounded by a heat insulation structure body, the burner and the hot blast stove are assembled into a whole, an air inlet of the hot blast stove is communicated with a space surrounded by the heat insulation structure body through an air return pipe, an air outlet of the hot blast stove is connected with an air return port of the fan through an air duct, and an air supply port of the fan is communicated with the space surrounded by the heat. The invention is modified on the basis of the original electric heating mode, additionally arranges a combustion heating mode, adopts the combustion heating mode when the electricity price is higher in the daytime, adopts the original electric heating mode at night, and carries out switching control according to the set time in the two modes, thereby achieving the purpose of peak-staggering electricity utilization.)
1. The utility model provides a stoving line heating device, its characterized in that, includes electric heating pipe, fortune wind motor, combustor, hot-blast furnace and fan, electric heating pipe and fortune wind motor interval set up in the transfer chain top, electric heating pipe, fortune wind motor and the transfer chain of both below are surrounded by the insulation construction body, combustor and hot-blast furnace assemble into an organic whole, the air intake of hot-blast furnace communicates with the space that insulation construction body surrounded with the return air duct, the air outlet of hot-blast furnace is connected with the return air inlet of wind channel with the fan, the supply-air outlet of fan communicates with the space that blast pipe and insulation construction body surrounded.
2. The drying line heating apparatus according to claim 1, wherein a main shaft of the fan is sleeved with an annular cooling water pipe, and a water inlet and a water outlet of the cooling water pipe are connected with the cooling water supply station through water pipes.
3. Drying line heating device according to claim 1, characterized in that the burner is of the gas type and is connected to a natural gas supply pipe.
4. The drying line heating apparatus according to claim 1, 2 or 3, wherein the return air duct and the blast air duct are both electrically operated dampers.
5. The drying line heating apparatus according to claim 1, wherein the return duct is provided with a plurality of return openings, and the return openings are spaced from each other and uniformly arranged on a side wall of the heat insulating structure; the air supply pipe is provided with a plurality of air supply outlets which are mutually spaced and uniformly arranged at the top of the heat insulation structure body; and the distance between the air return opening and the air supply opening is not less than the minimum set distance.
6. The drying line heating apparatus according to claim 4, further comprising a controller, wherein the temperature sensor is disposed in the space surrounded by the heat insulating structure and in the hot blast stove, and the controller is connected to the temperature sensor, the electric blast valve, the electric heating pipe, the air conveying motor, the burner and the fan, respectively.
7. The drying line heating apparatus according to claim 6, wherein said controller includes a signal circuit and a control output circuit, wherein,
the signal circuit comprises a signal selection switch S, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a NOT gate NG1 and a NOT gate NG2, wherein the signal selection switch S is provided with a temperature lower limit signal end I3, a temperature upper limit signal end I4 and a feeding end I5; the feeding end I5 is connected to a direct-current power supply V +, and the temperature lower limit signal end I3 is connected to the anode of a diode D1; the temperature upper limit signal terminal I4 is connected to the anode of a diode D2, the cathode of a diode D2 is connected to the input terminal of a NOT-gate NG2, the output terminal of the NOT-gate NG2 is connected to the anode of a diode D4, the cathode of a diode D4 and the cathode of a diode D1 are connected to the input terminal of a NOT-gate NG1, the output terminal of the NOT-gate NG1 is connected to the anode of a diode D3, the cathode of a diode D3 is connected to the input terminal of a NOT-gate NG2, and two ends of a resistor R1 are respectively connected to the input terminal of;
the control output circuit comprises a resistor R2, a diode D5, a triode T and a relay K, wherein the triode T is provided with a base B, a collector C and an emitter E, and the relay K is provided with a first contact end I1 and a second contact end I2; a first pin of a resistor R2 in the control output circuit is connected to the cathode of a diode D4 and the cathode of a diode D1, a first contact end I1 of a relay K is connected to a phase line of an alternating current power supply, and a second contact end I2 of the relay K and a zero line of the alternating current power supply are respectively connected to two wiring ends of the fan; the second pin of the resistor R2 is connected to the base B of the triode T, the emitter E of the triode T is connected to the ground, the collector C of the triode T is connected to the anode of the diode D5 and the second end of the coil of the relay K, and the cathode of the diode D5 and the first end of the coil of the relay K are connected to the direct-current power supply V +.
8. The drying line heating apparatus according to claim 1, wherein the heat insulating layer of the heat insulating structure is made of a high temperature resistant and fireproof rock wool material, the heat insulating structure is provided with a feed port and a discharge port, and the conveyor line penetrates into the heat insulating structure from the feed port and penetrates out from the discharge port.
9. A drying line heating method is characterized in that a space surrounded by a heat insulation structure body penetrated by a conveying line is heated by electric heat and combustion heat, wherein:
the electric heater is used at night, the electric heating pipe arranged in the space surrounded by the heat insulation structure body is electrified, and meanwhile, the air conveying motor arranged in the space surrounded by the heat insulation structure body is started, so that the temperature in the space surrounded by the heat insulation structure body is increased;
the combustion heat is used in daytime, the burner is started, the electric heating pipe is powered off, the combustion heat in the burner is conducted to the hot blast stove, air in the space surrounded by the heat insulation structure is brought into the hot blast stove through the fan, and the air is heated and heated in the hot blast stove and then is sent back to the space surrounded by the heat insulation structure, so that hot air circulation is realized.
10. The drying line heating method according to claim 9, characterized by employing the following heating control strategy for control:
selecting and switching an electric heating mode and a combustion heat mode according to set time, switching to the combustion heat mode in the daytime and switching to the electric heating mode at night;
during the day, heating is carried out with burning natural gas:
firstly, calculating a theoretical value of required natural gas supply according to the water content of a material to be dried;
and calculating the natural gas supply compensation amount of the combustor by adopting the following formula:
wherein Q represents a natural gas supply compensation amount; k represents a proportionality coefficient; t represents time; s0(t) represents a theoretical value for natural gas supply; s1(t) represents measured value of natural gas supply; t isiRepresents an integration time constant; t isdRepresents a differential time constant;
then, after the theoretical value of the natural gas supply is corrected by the natural gas supply compensation amount, the theoretical value is used for controlling the natural gas supply amount;
at night, the heating temperature is controlled by controlling the power-on and power-off of the electric heating pipe.
Technical Field
The invention relates to the technical field of drying processes in industrial production, in particular to a drying line heating device and a drying line heating method.
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 load of power supply, waste electric resources, have higher operation cost, and particularly have more obvious expensive electric charge in daytime, so that the heating mode and the equipment are very necessary to be modified.
Disclosure of Invention
In order to solve the technical problems, through careful research and certification, the invention provides a drying line heating device which comprises an electric heating pipe, an air conveying motor, a burner, a hot blast stove and a fan, wherein the electric heating pipe and the air conveying motor are arranged above a conveying line at intervals, the electric heating pipe, the air conveying motor and the conveying line below the electric heating pipe and the air conveying motor are surrounded by a heat insulation structure, the burner and the hot blast stove are assembled into a whole, an air inlet of the hot blast stove is communicated with a space surrounded by the heat insulation structure through an air return pipe, an air outlet of the hot blast stove is connected with an air return port of the fan through an air duct, and an air supply port of the fan is communicated with a space surrounded by the heat.
Optionally, an annular cooling water pipe is sleeved outside the main shaft of the fan, and a water inlet and a water outlet of the cooling water pipe are connected with a cooling water supply station through water pipes.
Optionally, the burner is gas fired and is connected to a natural gas supply line.
Optionally, the return air pipe and the blast pipe are both provided with electric air valves.
Optionally, the air return pipe is provided with a plurality of air return openings, and the air return openings are spaced from each other and uniformly arranged on the side wall of the heat insulation structure; the air supply pipe is provided with a plurality of air supply outlets which are mutually spaced and uniformly arranged at the top of the heat insulation structure body; and the distance between the air return opening and the air supply opening is not less than the minimum set distance.
Optionally, the air-conditioning system further comprises a controller, wherein temperature sensors are arranged in the space surrounded by the heat insulation structure body and the hot blast stove, and the controller is respectively connected with the temperature sensors, the electric air valve, the electric heating pipe, the air conveying motor, the burner and the fan.
Optionally, the controller comprises a signal circuit and a control output circuit, wherein,
the signal circuit comprises a signal selection switch S, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a NOT gate NG1 and a NOT gate NG2, wherein the signal selection switch S is provided with a temperature lower limit signal end I3, a temperature upper limit signal end I4 and a feeding end I5; the feeding end I5 is connected to a direct-current power supply V +, and the temperature lower limit signal end I3 is connected to the anode of a diode D1; the temperature upper limit signal terminal I4 is connected to the anode of a diode D2, the cathode of a diode D2 is connected to the input terminal of a NOT-gate NG2, the output terminal of the NOT-gate NG2 is connected to the anode of a diode D4, the cathode of a diode D4 and the cathode of a diode D1 are connected to the input terminal of a NOT-gate NG1, the output terminal of the NOT-gate NG1 is connected to the anode of a diode D3, the cathode of a diode D3 is connected to the input terminal of a NOT-gate NG2, and two ends of a resistor R1 are respectively connected to the input terminal of;
the control output circuit comprises a resistor R2, a diode D5, a triode T and a relay K, wherein the triode T is provided with a base B, a collector C and an emitter E, and the relay K is provided with a first contact end I1 and a second contact end I2; a first pin of a resistor R2 in the control output circuit is connected to the cathode of a diode D4 and the cathode of a diode D1, a first contact end I1 of a relay K is connected to a phase line of an alternating current power supply, and a second contact end I2 of the relay K and a zero line of the alternating current power supply are respectively connected to two wiring ends of the fan; the second pin of the resistor R2 is connected to the base B of the triode T, the emitter E of the triode T is connected to the ground, the collector C of the triode T is connected to the anode of the diode D5 and the second end of the coil of the relay K, and the cathode of the diode D5 and the first end of the coil of the relay K are connected to the direct-current power supply V +.
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.
The invention also provides a drying line heating method, which adopts two modes of electric heating and combustion heat for the space surrounded by the heat insulation structure body through which the conveying line passes, wherein:
the electric heater is used at night, the electric heating pipe arranged in the space surrounded by the heat insulation structure body is electrified, and meanwhile, the air conveying motor arranged in the space surrounded by the heat insulation structure body is started, so that the temperature in the space surrounded by the heat insulation structure body is increased;
the combustion heat is used in daytime, the burner is started, the electric heating pipe is powered off, the combustion heat in the burner is conducted to the hot blast stove, air in the space surrounded by the heat insulation structure is brought into the hot blast stove through the fan, and the air is heated and heated in the hot blast stove and then is sent back to the space surrounded by the heat insulation structure, so that hot air circulation is realized.
Optionally, the following heating control strategy is adopted for control:
selecting and switching an electric heating mode and a combustion heat mode according to set time, switching to the combustion heat mode in the daytime and switching to the electric heating mode at night;
during the day, heating is carried out with burning natural gas:
firstly, calculating a theoretical value of required natural gas supply according to the water content of a material to be dried;
and calculating the natural gas supply compensation amount of the combustor by adopting the following formula:
wherein Q represents a natural gas supply compensation amount; k represents a proportionality coefficient; t represents time; s0(t) represents a theoretical value for natural gas supply; s1(t) represents measured value of natural gas supply; t isiRepresents an integration time constant; t isdRepresents a differential time constant;
then, after the theoretical value of the natural gas supply is corrected by the natural gas supply compensation amount, the theoretical value is used for controlling the natural gas supply amount;
at night, the heating temperature is controlled by controlling the power-on and power-off of the electric heating pipe.
The invention is modified on the basis of the original electric heating mode, additionally arranges a combustion heating mode, adopts the combustion heating mode when the electricity price is higher in the daytime, adopts the original electric heating mode at night, and carries out switching control according to the set time in the two modes, thereby achieving the purpose of peak-staggering electricity utilization.
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 an elevation view of a drying line heating apparatus according to an embodiment of the present invention;
FIG. 2 is a right side view of the embodiment of FIG. 1;
FIG. 3 is a top view of the embodiment of FIG. 1;
fig. 4 is a schematic diagram of a signal circuit and a control output circuit of the controller.
In the figure: 1-electric heating pipe, 2-air conveying motor, 3-burner, 4-hot blast stove, 5-fan, 6-conveying line, 7-heat preservation structure, 8-electric air valve, 9-blast pipe, 10-return air pipe, 11-water inlet, 12-water outlet, 13-temperature sensor, 14-fuel interface, 15-driving motor and 16-material.
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. 1-3, the invention provides a drying line heating device, which comprises an electric heating pipe 1, an air conveying motor 2, a burner 3, a hot blast stove 4 and a fan 5, wherein the electric heating pipe 1 and the air conveying motor 2 are arranged above a conveying line 6 at intervals, the electric heating pipe 1, the air conveying motor 2 and the conveying line 6 below the electric heating pipe 1 and the air conveying motor 2 are surrounded by a heat insulation structure 7, the electric heating pipe 1 and the air conveying motor 2 are fixedly arranged at the top in the heat insulation structure 7 in a staff rod hoisting manner, the burner 3 and the hot blast stove 4 are assembled into a whole, an air inlet of the hot blast stove 4 is communicated with a space surrounded by the heat insulation structure 7 through an air return pipe 10, an air outlet of the hot blast stove 4 is connected with a return air inlet of the fan through an air duct, and an air supply outlet of the fan 5 is.
The working principle of the technical scheme is as follows: the drying line heating device is provided with two heating operation modes, firstly, a combustion heating mode is adopted in the daytime, a burner, a hot blast stove and a fan are started, the fan introduces air in a space surrounded by the heat insulation structure into the hot blast stove through a return air pipe, fuel is guided by the burner to be combusted in the hot blast stove, the temperature of the air is raised by heat generated by combustion, and the air with raised temperature is conveyed back to the space surrounded by the heat insulation structure through an air supply pipe to form hot air circulation for heating and drying; secondly, an electric heating mode is adopted at night, the burner, the hot blast stove and the fan are closed, the air conveying motor is started to electrify the electric heating pipe, the electric heating pipe converts electric energy into heat to be dissipated into the space surrounded by the heat insulation structure body, the air conveying motor is started to enable air in the space surrounded by the heat insulation structure body to form convection, heat dissipation of the electric heating pipe is accelerated, and meanwhile the air temperature in the space surrounded by the heat insulation structure body is enabled to be more uniform.
The beneficial effects of the above technical scheme are: reform transform on original electric heating mode basis, add and established the burning heating mode, adopt the burning heating mode when the price of electricity is higher daytime, adopt original electric heating mode evening, two kinds of modes carry out switching control according to the settlement time, reach the purpose of off-peak power consumption, suit with peak valley price of electricity policy, can save manufacturing cost greatly, balanced peak valley power consumption difference.
In one embodiment, the main shaft of the fan 5 is sleeved with an annular cooling water pipe, and the water inlet 11 and the water outlet 12 of the cooling water pipe are connected with a cooling water supply station through water pipes.
The working principle of the technical scheme is as follows: the air temperature of the heated air circulation is high, so that the fan and the main shaft of the fan work under the high temperature condition, the annular cooling water pipe is arranged to be connected with cooling water from the outside, and the cooling water is used for cooling the fan and the main shaft of the fan at a short distance.
The beneficial effects of the above technical scheme are: the arrangement of the annular cooling water pipe improves the working conditions of the fan and the main shaft thereof, can prolong the service life of the fan and the main shaft thereof, reduces faults and shortens maintenance time.
In one embodiment, the burner 3 is of the gas type and is connected to a natural gas supply line by means of a fuel interface 14; the air return pipe 10 and the air supply pipe 9 are both provided with an electric air valve 8; the air return pipe 10 is provided with a plurality of air return ports which are mutually spaced and uniformly arranged on the side wall of the heat insulation structure body 7; the air supply pipe 9 is provided with a plurality of air supply outlets which are mutually spaced and uniformly arranged at the top of the heat insulation structure body 7; and the distance between the air return opening and the air supply opening is not less than the minimum set distance.
The working principle of the technical scheme is as follows: electric air valves are arranged on the air return pipe and the air supply pipe, when combustion heating is carried out in daytime, the electric air valves are opened, and high-temperature air is conveyed into a space surrounded by the heat insulation structure body through heating of the hot blast stove and hot air circulation for heating so as to keep the drying temperature; when adopting electric heating pipe heating night, electric air valve closes, and electric heating pipe and fortune wind motor circular telegram operation have cut off the air current of the space that the insulation structure body surrounded and blast pipe and return air hose for the heat that the electric heating pipe in the space that the insulation structure body surrounded produced can not send out along the tuber pipe dish and lead to the waste of heat.
The beneficial effects of the above technical scheme are: the electric air valve can prevent heat in the space surrounded by the heat insulation structure body from being radiated outwards along the air pipe when the electric heating pipe is used for heating at night, so that the heat waste and the energy consumption increase are prevented. The air supply outlet and the air return inlet are uniformly arranged at intervals, so that air supply is quickly diffused in the space surrounded by the heat insulation structure body when combustion heating is adopted, a temperature field in the space surrounded by the heat insulation structure body is favorably ensured to be balanced, the condition that the temperature of part of regions is high and the temperature of other regions is low is avoided, and the efficiency of drying production is favorably improved.
In one embodiment, the air heating system further comprises a controller, wherein the controller can be installed on the outer wall surface of the heat insulation structure 7, temperature sensors 13 are arranged in the space surrounded by the heat insulation structure 7 and the air heating furnace 4, and the controller is respectively connected with the temperature sensors 13, the electric air valve 8, the electric heating pipe 1, the air conveying motor 2, the combustor 3 and the fan 5.
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 and the air conveying motor to be powered off, the electric air valve is opened, the burner and the fan are started, and the combustion heating is carried out according to the temperature condition measured by the temperature sensor; the controller control switches into the electric heating pipe heating mode evening, and electronic blast gate is closed, and combustor and fan stop operation, electric heating pipe and fortune wind motor circular telegram give off the electric energy conversion heat energy in the space that the structure of keeping warm surrounds to carry out temperature control through temperature sensor, stop heating when the temperature reaches the upper limit of control range, restart heating when the temperature drops 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 includes a signal circuit and a control output circuit, wherein,
the signal circuit comprises a signal selection switch S, a diode D1, a diode D2, a diode D3, a diode D4, a resistor R1, a NOT gate NG1 and a NOT gate NG2, wherein the signal selection switch S is provided with a temperature lower limit signal end I3, a temperature upper limit signal end I4 and a feeding end I5; the feeding end I5 is connected to a direct-current power supply V +, and the temperature lower limit signal end I3 is connected to the anode of a diode D1; the temperature upper limit signal terminal I4 is connected to the anode of a diode D2, the cathode of a diode D2 is connected to the input terminal of a NOT-gate NG2, the output terminal of the NOT-gate NG2 is connected to the anode of a diode D4, the cathode of a diode D4 and the cathode of a diode D1 are connected to the input terminal of a NOT-gate NG1, the output terminal of the NOT-gate NG1 is connected to the anode of a diode D3, the cathode of a diode D3 is connected to the input terminal of a NOT-gate NG2, and two ends of a resistor R1 are respectively connected to the input terminal of;
the control output circuit comprises a resistor R2, a diode D5, a triode T and a relay K, wherein the triode T is provided with a base B, a collector C and an emitter E, and the relay K is provided with a first contact end I1 and a second contact end I2; a first pin of a resistor R2 in the control output circuit is connected to the cathode of a diode D4 and the cathode of a diode D1, a first contact end I1 of a relay K is connected to a phase line of an alternating current power supply, and a second contact end I2 of the relay K and a zero line of the alternating current power supply are respectively connected to two wiring ends of the fan; the second pin of the resistor R2 is connected to the base B of the triode T, the emitter E of the triode T is connected to the ground, the collector C of the triode T is connected to the anode of the diode D5 and the second end of the coil of the relay K, and the cathode of the diode D5 and the first end of the coil of the relay K are connected to the direct-current power supply V +.
The working principle and the beneficial effects of the technical scheme are as follows: the temperature measurement data of the target area is linked with the operation of the fan through the signal circuit and the control output circuit, the operation of the fan is adjusted according to the real-time measurement result, and a burner can be set to be linked with the fan; the accurate control of the drying temperature can be realized and the drying quality of the materials can be ensured.
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 6 penetrates into the heat insulation structure 7 from the feeding hole and penetrates out of the discharging hole, the conveying line 6 is driven by a driving motor 15, the conveying line 6 conveys the material 16 into the inner space surrounded by the heat insulation structure 7 from the feeding hole, and the material is dried and then removed from the discharging hole. A dehumidifier may be disposed in the internal space surrounded by the heat insulating structure 7, and a drain pipe extending to the outside of the heat insulating structure 7 is connected to the dehumidifier.
The working principle and the beneficial effects of the technical scheme are as follows: the heat-insulating layer made of the high-temperature-resistant and fireproof rock wool material meets the heat-insulating requirement and can prevent fire. The dehumidifier is arranged, so that the water content of the internal air can be conveniently prevented from being saturated, and the problem that the materials cannot be dried due to the saturation of water vapor in the air is avoided.
In one embodiment, the return air duct 10 and the blast duct 9 are made of galvanized steel sheets, the outer sides of the duct walls of the return air duct 10 and the blast duct 9 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 air pipe is provided with the heat preservation layer, so that the heat loss in hot air circulation can be reduced, the heat waste is prevented, and the energy consumption and the cost are saved.
The invention also provides a drying line heating method, which adopts two modes of electric heating and combustion heat for the space surrounded by the heat insulation structure body through which the conveying line passes, wherein:
the electric heater is used at night, the electric heating pipe arranged in the space surrounded by the heat insulation structure body is electrified, and meanwhile, the air conveying motor arranged in the space surrounded by the heat insulation structure body is started, so that the temperature in the space surrounded by the heat insulation structure body is increased;
the combustion heat is used in daytime, the burner is started, the electric heating pipe is powered off, the combustion heat in the burner is conducted to the hot blast stove, air in the space surrounded by the heat insulation structure is brought into the hot blast stove through the fan, and the air is heated and heated in the hot blast stove and then is sent back to the space surrounded by the heat insulation structure, so that hot air circulation is realized.
In one embodiment, the drying line heating method is controlled by adopting the following heating control strategy:
selecting and switching an electric heating mode and a combustion heat mode according to set time, switching to the combustion heat mode in the daytime and switching to the electric heating mode at night;
during the day, heating is carried out with burning natural gas:
firstly, calculating a theoretical value of required natural gas supply according to the water content of a material to be dried;
and calculating the natural gas supply compensation amount of the combustor by adopting the following formula:
wherein Q represents a natural gas supply compensation amount; k represents a proportionality coefficient; t represents time; s0(t) represents a theoretical value for natural gas supply; s1(t) represents measured value of natural gas supply; t isiRepresents an integration time constant; t isdRepresents a differential time constant;
then, after the theoretical value of the natural gas supply is corrected by the natural gas supply compensation amount, the theoretical value is used for controlling the natural gas supply amount;
at night, the heating temperature is controlled by controlling the power-on and power-off of the electric heating pipe.
The working principle and the beneficial effects of the technical scheme are as follows: controlling the selection of the heating mode according to the set time; when combustion heating is adopted in the daytime, the supply quantity control error of the natural gas required to be combusted for heating is calculated through a specific algorithm and is used as a basis for correcting the subsequent natural gas supply quantity, the accurate control of natural gas supply is realized, and insufficient supply or excessive waste is prevented.
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.
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