Fuel gas infrared radiation hot air dual-mode drying furnace for drying printing ink

Abstract

The invention discloses a fuel gas infrared radiation hot air dual-mode drying oven for drying printing ink, which comprises an oven body shell, a heating bin and two machine position bins are arranged in the oven body shell, the two machine position bins are symmetrically distributed at the top and the bottom of the heating bin, and an inlet and an outlet penetrating through the oven body shell are respectively formed in two sides of the middle of the heating bin. Printing paper is heated in a gas infrared radiation mode and a hot air mode, the physical characteristics that infrared rays can penetrate through and an object actively absorbs heat of the infrared rays are achieved, printing ink and the interior of the paper are rapidly heated, and high-temperature flue gas waste gas generated by a front-end gas infrared radiation burner is utilized in the later process; the air blower and the air feeder are used for guiding to the air knife to dry the surface of the printing ink in a hot air circulation mode, the gas consumption of the burner is lower, the heating speed is higher, the fuel gas energy consumption is further reduced, under the working condition of the same fuel gas consumption, the speed of the printing machine is remarkably increased, and the requirement that the fuel gas energy consumption of an existing conventional fuel gas burner is expected to be lower is met.

Description

Technical Field

[0001] The invention relates to the technical field of printing, in particular to a gas-fired infrared radiation hot air double-mode drying furnace for drying printing ink. Background Art

[0002] In the printing industry, if the ink is not dried in a drying oven after being printed on paper, the ink will spread on the paper, causing problems such as substandard product quality, blurred handwriting, dull colors, and dirty images. Using natural drying will reduce the printing speed of the printing press, so a printing drying oven is needed to dry the printed paper.

[0003] The existing printing drying furnaces have electric heating and gas heating. The electricity consumption cost of electric heating is 2-3 times higher than that of gas. The cost of using electric heating is calculated as follows: industrial electricity costs 0.8 yuan per kilowatt-hour, and the cost of natural gas is 3.5 yuan per cubic meter. The calorific value of natural gas is 8600 kcal per cubic meter, which is equivalent to about 10KW of electric power. In this way, the cost of natural gas for every 1KW of power is 0.35 yuan. 0.8 yuan per kilowatt-hour of electricity is 0.45 yuan higher than natural gas for the same heating of 1KW power. Therefore, electric drying furnaces are only chosen by some customers who do not care about energy consumption or where there is no natural gas or other gas supply in the local area.

[0004] The gas drying furnace uses a gas burner to burn and heat the air, and the hot air heats the paper to dry it. The existing gas drying furnace is equipped with two gas burners, each with a power of 250,000 kcal, a total power of 500,000 kcal, and a drying oven of 6 meters long. Conventional burners need to use hot air to conduct a large amount of hot air in the furnace, and a large amount of pollutant gases containing volatile VOCs will be generated when drying the ink. Therefore, a 200,000 kcal duct burner is designed to be installed inside the duct exhaust, and the VOC gas generated in the furnace is again passed through the high-temperature flame of the duct burner to crack it at high temperature. At present, the drying furnaces used in this industry are second-hand imported equipment from abroad. Due to the confidentiality of the electronic control program and core parameters, the motor operating parameters above cannot be adjusted by frequency conversion, and the temperature of the drying furnace controlled by the burner cannot be set arbitrarily. Even if the energy consumption is high, the parameters cannot be changed at will.

[0005] Therefore, it is necessary to research and develop a gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink in response to the problems existing in the prior art. The printed paper is heated by gas-fired infrared radiation and hot air modes, and an automatic constant temperature control is realized in conjunction with a PID controller intelligent temperature control instrument, so that the temperature can be adjusted arbitrarily. Through the adjustment of the manual control mode and the automatic control mode, not only can the combustion be made more complete and stable, but also a constant temperature can be maintained at the feeding channel while saving fuel. While meeting the actual drying needs, energy consumption is reduced and the hidden danger of damage to the paper is reduced.

[0007] To achieve the above object, the present invention provides the following technical solutions: A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink, comprising a furnace body casing, a heating bin and two machine bins are arranged inside the furnace body casing, the two machine bins are symmetrically distributed at the top and bottom of the heating bin, an inlet and an outlet penetrating the furnace body casing are arranged on both sides of the middle of the heating bin, and a feeding channel is formed between the inlet and the outlet of the heating bin for feeding printing paper, a primary drying mechanism is arranged in the front end of the machine bin and the corresponding heating bin, and a secondary drying mechanism is arranged in the rear end of the machine bin and the corresponding heating bin; An air duct is installed in the aircraft compartment, and a blower is provided at the front end of the side wall of the air duct corresponding to the aircraft compartment; The first-stage drying mechanism includes a linear burner and a far-infrared radiator, wherein the linear burner is used to burn gas to heat the air in the furnace casing, and the far-infrared radiator is installed at the end of the linear burner; The secondary drying mechanism includes an air blower and an air knife. The air blower is installed at the front end of the side wall of the air duct corresponding to the machine position bin. Its input end and the blower output end are both connected to the air duct. The air supply directions of the air blower and the blower are opposite, so that the hot air produced by the primary drying mechanism is pumped to the rear end of the heating bin. The output end of the air blower is connected to the air knife through an air supply pipe. The air knife is hoisted in the heating bin and symmetrically distributed on both sides of the feeding channel. The input end of the linear burner is provided with a gas valve group for adjusting the drying environment in the heating chamber.

[0008] Preferably, the gas valve group comprises: The DN40 gas branch pipe is internally provided with a first pressure gauge, a first solenoid valve and an SVP valve + proportional motor, wherein the first pressure gauge is used to test and display the pressure value of the gas inside the DN40 gas branch pipe, the first solenoid valve is used to control the opening / closing of the DN40 gas branch pipe, and the SVP valve + proportional motor is used to control the flow rate of the gas; An air replenishment pipe is provided with a second pressure gauge and a second solenoid valve inside, wherein the second pressure gauge is used to test and display the pressure value of the air inside the air replenishment pipe, and the second solenoid valve is used to control the opening / closing of the air replenishment pipe, and an air pump is provided at the output end of the air replenishment pipe to pump air into the air replenishment pipe; A premixer is used to premix the gas and air in proportion. The number of premixers is set to be multiple. One end of the multiple premixers is distributed in a linear array and connected to the air supply pipe. The other end of the premixer extends to the corresponding linear burner input end. A third solenoid valve is provided at the connection between the premixer and the linear burner input end. Each premixer is connected to the DN40 gas branch pipe through an air supply pipe. A BVM valve is provided in the premixer for adjusting and mixing the gas and air. Preferably, the connection ends of the blower and the air supply fan are both provided with frequency converters for controlling the air supply efficiency of the blower and the air supply fan; A temperature sensor is provided in the front end of the heating chamber for sensing the temperature at the feeding channel; The DN40 gas branch pipe and the gas delivery pipe are both provided with flow meters for measuring the flow of gas and combustion-supporting air respectively; A pressure reducing valve is provided inside the premixer to reduce the higher pressure from the gas source to the pressure range required for the normal operation of the linear burner; A pressure switch is provided inside the input end of the linear burner for monitoring and controlling the pressure of the mixed fluid.

[0009] Preferably, a PID controller is provided on one side of the gas valve group, and the input and output ends of the PID controller are respectively provided with an A / D converter and a D / A converter, wherein the temperature sensor, flow meter, first pressure gauge, second pressure gauge and pressure switch are all electrically connected to the A / D converter, and the first solenoid valve, SVP valve + proportional motor, second solenoid valve, third solenoid valve, BVM valve, frequency converter of the blower and air supply fan, and pressure reducing valve are all electrically connected to the D / A converter.

[0010] Preferably, the inlet and outlet of the DN40 gas branch pipe are both equipped with ball valves; The air supply pipe is provided with a manual flow regulating valve for regulating the flow of fuel gas or combustion-supporting air.

[0011] Preferably, filters are provided inside the DN40 gas branch pipe and the gas supply pipe to filter impurities in the gas and combustion-supporting air.

[0012] Preferably, a partition is provided between the heating chamber and the machine chamber, and the partition is fixedly connected to the inner wall of the furnace body casing, and the air supply pipe and the pipe at the input end of the linear burner pass through the partition and are interference fit with the through hole.

[0013] Preferably, a protective net is provided at the front end of the heating chamber and between the far-infrared radiator and the feeding channel, and a diverter plate is provided at the rear end of the heating chamber and between the wind knife and the feeding channel.

[0014] Preferably, the first-level drying mechanism is provided with multiple groups, and the multiple groups of first-level drying mechanisms are axially symmetrically distributed in the two machine positions; The number of the blowers matches the number of the primary drying mechanisms, and the multiple linear burners of the primary drying mechanisms share one exhaust pipe, and the blower input end is connected to the corresponding exhaust pipe; A plurality of DN40 gas branch pipes are connected to the DN40 gas main pipeline, and the DN40 gas main pipeline is connected to an external gas source through a high-pressure pump.

[0015] Preferably, the number of the blowers and wind knives is set to be multiple, and the multiple wind knives are assembled in a one-to-one correspondence with the air supply pipes provided at the output ends of the multiple blowers.

[0016] Technical effects and advantages of the present invention: The printed paper is heated by two modes: gas infrared radiation and hot air. The infrared can penetrate and the physical properties of objects actively absorb infrared heat, which can quickly heat the ink and the inside of the paper. In the back process, the high-temperature flue gas produced by the front-end gas infrared radiation burner is used to guide the hot air circulation method of the wind knife to quickly dry the ink surface by using the blower and the air supply fan. The burner consumes less gas and heats faster, further reducing gas energy consumption. Under the same gas consumption conditions, the speed of the printing press is significantly improved, meeting the requirements of lower gas energy consumption of existing conventional gas burners, achieving energy conservation and emission reduction, and increasing production capacity. Through the PID controller intelligent temperature control instrument, automatic constant temperature control is achieved, and the drying operation parameters are flexibly adjusted according to the paper thickness, heating time, etc. The temperature can be adjusted arbitrarily, which solves the need to adjust the wind speed and temperature according to different products and outputs, and the frequency, air volume and temperature can be automatically adjusted at will; in addition, the gas valve group has manual control mode and automatic control mode, which can not only make the combustion more complete and stable, but also maintain a constant temperature in the feeding channel while saving fuel; while meeting the actual drying needs, it reduces energy consumption and reduces the risk of damage to paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention (the aircraft compartment is opened); Figure 2 It is a schematic diagram of the internal structure of the overall structure of the present invention; Figure 3 It is a front cross-sectional view of the local structure of the present invention; Figure 4 For the present invention Figure 3 Middle AA section view; Figure 5 This is a first-perspective stereoscopic view of the gas valve group in the present invention; Figure 6 A second perspective stereoscopic view of the gas valve assembly of the present invention; Figure 7 It is a system control flow chart of the intelligent temperature control system based on PID controller in the present invention.

[0018] In the figure: Furnace casing-1; primary drying mechanism-2; secondary drying mechanism-3; air duct-4; blower-5; gas valve group-6; temperature sensor-7; flow meter-8; pressure reducing valve-9; pressure switch-10; PID controller-11; ball valve-12; manual flow regulating valve-13; protective net-14; diverter plate-15; DN40 gas main pipeline-16; Heating chamber-101; Machine chamber-102; Feeding channel-103; Linear burner-201; Far infrared radiator-202; Air blower-301; air knife-302; air supply pipe-303; DN40 gas branch pipe-601; first pressure gauge-602; first solenoid valve-603; SVP valve + proportional motor-604; air supply pipe-605; second pressure gauge-606; second solenoid valve-607; premixer-608; third solenoid valve-609; air supply pipe-610; BVM valve-611; air pump-612. DETAILED DESCRIPTION

[0019] An embodiment of the present invention is further described below in conjunction with the accompanying drawings: Refer to the instruction manual Figure 1-7 As shown, a gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink comprises a furnace body casing 1, the inner shell of the furnace body casing 1 is made of stainless steel, with an air-flowing plate, reinforced with angle iron and square tube, and made of steel plate on the outside; A heating bin 101 and two machine bins 102 are arranged inside the furnace body casing 1. The two machine bins 102 are symmetrically distributed at the top and bottom of the heating bin 101. An inlet and an outlet penetrating the furnace body casing 1 are arranged on both sides of the middle of the heating bin 101, and a feeding channel 103 is formed between the inlet and the outlet of the heating bin 101 for feeding printed paper. A primary drying mechanism 2 is arranged at the front end of the machine bin 102 and its corresponding heating bin 101, and a secondary drying mechanism 3 is arranged at the rear end of the machine bin 102 and its corresponding heating bin 101. An air duct 4 is installed in the machine position compartment 102, and a blower 5 is provided at the side wall of the air duct 4 corresponding to the front end of the machine position compartment 102; The first-level drying mechanism 2 includes a linear burner 201 and a far-infrared radiator 202, wherein the linear burner 201 is used to burn gas to heat the air in the furnace body casing 1, and the far-infrared radiator 202 is installed at the end of the linear burner 201, and the far-infrared radiator 202 is heated by the heat energy of the linear burner 201, and far-infrared rays are emitted outward and act on the printed paper in the feeding channel 103; the interior of the linear burner 201 is provided with an ignition sensing integrated needle, adopts fully automatic ignition, and is equipped with a flame detection safety system; the first-level drying mechanism 2 refers to the Boside infrared premixed burner, the nitrogen oxide emission of this burner is less than 30 mg per cubic meter of flue gas, and it is an ultra-low nitrogen emission gas infrared radiation heater.

[0020] Any object will radiate energy. According to Boltzmann's law, the relationship between radiated energy and temperature follows the following formula: ; It can be seen that the energy radiated by an object is in a fourth power relationship with its temperature, that is, the higher the temperature of the object, the greater the energy radiated outward. The heat generated by the combustion of gas can raise the temperature of an object to 800-1000℃, thereby radiating strong infrared rays with a corresponding wavelength of 2-4µm.

[0021] Infrared is an invisible light that travels in a straight line at the speed of light and has a certain degree of penetration. After being absorbed by an object, infrared can be quickly converted into heat energy, thus having a strong heating effect. Different materials have different absorption rates for infrared, and water is one of the substances that can strongly absorb infrared. After water absorbs infrared, its temperature rises rapidly and evaporates, which is the principle of infrared drying. The speed of infrared heating is several times faster than that of conventional hot air heating. Therefore, infrared can be used in situations where rapid heating and drying are required.

[0022] Since the linear burner 201 is a fully premixed combustion, the combustion is more complete and the CO emission is very low; and in the infrared combustion mode, the NOx emission is <10ppm; the fully premixed combustion method is adopted, the air excess coefficient is extremely low, and the thermal efficiency is increased by more than 10% compared with the conventional burner; the temperature can be kept constant by controlling the efficiency of the blower 5 and the ratio of the gas to proportionally adjust the firepower.

[0023] The secondary drying mechanism 3 includes an air blower 301 and an air knife 302. The air blower 301 is installed at the front end of the side wall of the air duct 4 corresponding to the machine position bin 102. Its input end and the output end of the blower 5 are both connected to the air duct 4. The air supply direction of the air blower 301 is opposite to that of the blower 5, so that the hot air produced by the primary drying mechanism 2 is pumped to the rear end of the heating bin 101. The output end of the air blower 301 is connected to the air knife 302 through the air supply pipe 303. The air knife 302 is hoisted in the heating bin 101 and symmetrically distributed on both sides of the feeding channel 103. After being guided, the hot air is circulated in the heating chamber 101, and the internal temperature uniformity is good, and the empty box temperature does not exceed ±5°C.

[0024] The input end of the linear burner 201 is provided with a gas valve group 6 for adjusting the drying environment in the heating chamber 101 .

[0025] Furthermore, in the above technical solution, the gas valve group 6 includes: The DN40 gas branch pipe 601 is internally provided with a first pressure gauge 602, a first solenoid valve 603 and an SVP valve + proportional motor 604, wherein the first pressure gauge 602 is used to test and display the pressure value of the gas inside the DN40 gas branch pipe 601, the first solenoid valve 603 is used to control the opening / closing of the DN40 gas branch pipe 601, and the SVP valve + proportional motor 604 is used to control the flow rate of the gas; the SVP valve + proportional motor 604 can adjust the gas supply according to a certain ratio based on the power requirement of the linear burner 201, so that the air-fuel ratio in the combustion process is maintained within an appropriate range, thereby ensuring the stability and efficiency of the combustion, and reducing energy consumption and pollutant emissions.

[0026] The air supply pipe 605 is provided with a second pressure gauge 606 and a second solenoid valve 607, wherein the second pressure gauge 606 is used to test and display the pressure value of the air inside the air supply pipe 605, and the second solenoid valve 607 is used to control the opening / closing of the air supply pipe 605. The output end of the air supply pipe 605 is provided with an air pump 612, which is used to pump air into the air supply pipe 605 to provide sufficient combustion-supporting air for the combustion process. Combustion requires the gas and oxygen to be fully mixed, and the air pump 612 delivers air to the combustion area, so that the gas can burn more completely and efficiently, thereby improving the combustion efficiency, and helping to stabilize the flame, so that the combustion process can be carried out more safely and continuously.

[0027] The premixer 608 is used to premix the gas and air in proportion. The number of premixers 608 is set to be multiple. One end of the multiple premixers 608 is distributed in a linear array and connected to the air supply pipe 605. The other end of the premixer 608 extends to the input end of the corresponding linear burner 201. A third solenoid valve 609 is provided at the connection between the premixer 608 and the input end of the linear burner 201. Each third solenoid valve 609 controls the air intake of the burner of a linear burner 201. When the corresponding linear burner 201 is to be controlled to prepare for ignition, the third solenoid valve 609 is provided. When the third solenoid valve 609 is opened for ignition, and after ignition, it is kept open to supply gas for combustion; each premixer 608 is connected to the DN40 gas branch pipe 601 through the air supply pipe 610, and a BVM valve 611 is arranged in the premixer 608 to adjust and mix the gas and air; the BVM valve 611 can accurately control the flow of gas and air, and the cross-sectional area of ​​the channel is changed by adjusting the opening of the BVM valve 611, thereby adjusting the amount of gas or air entering the linear burner 201 to achieve a suitable air-fuel ratio. In addition, in the mixing part of the premixer 608, the premixer 608 effect is used to fully mix the gas and air to ensure more complete and efficient combustion, which helps to optimize the combustion process and improve the combustion quality, and also reduces the emission of pollutants to a certain extent.

[0028] Furthermore, in the above technical solution, the connection ends of the blower 5 and the air supply fan 301 are both provided with frequency converters for controlling the air supply efficiency of the blower 5 and the air supply fan 301; the blower 5 and the air supply fan 301 adopt DC speed regulation to adjust the air volume and air pressure according to the combustion conditions.

[0029] A temperature sensor 7 is provided in the front end of the heating chamber 101 for sensing the temperature at the feeding channel 103; the temperature sensor 7 is a stainless steel armor K-type platinum resistance temperature sensor; Flow meters 8 are provided inside the DN40 gas branch pipe 601 and the air supply pipe 610, respectively, for measuring the flow of gas and combustion-supporting air; by accurately measuring the flow, it is possible to ensure that the gas and combustion-supporting air are mixed in a suitable proportion. This is crucial to the combustion process, allowing the linear burner 201 to work stably and efficiently, and helps to achieve precise combustion control, thereby improving combustion efficiency, reducing energy waste, and reducing the risk of harmful gases produced due to incomplete combustion.

[0030] A pressure reducing valve 9 is provided inside the premixer 608 to reduce the higher pressure from the gas source to the pressure range required for the normal operation of the linear burner 201, and ensure the stability of the gas supply pressure. If the pressure is too high, it may cause dangerous situations such as unstable flame, flashback, and even explosion. When the gas source pressure fluctuates, the pressure reducing valve 9 can automatically adjust the output pressure to ensure that the linear burner 201 operates at a relatively stable pressure, thereby ensuring the combustion quality and efficiency.

[0031] Inside the input end of the linear burner 201, a pressure switch 10 is provided for monitoring and controlling the pressure of the mixed fluid. When the pressure of the mixed fluid is abnormally too high or too low, the pressure switch 10 can detect it in time, thus avoiding situations such as unstable combustion, flashback or flameout caused by pressure problems. The pressure switch 10 is also used to control the start and stop of the linear burner 201. When the pressure of the mixed fluid is outside the normal range, it will send a signal to stop the linear burner 201 to ensure the safe operation of the equipment; when the pressure returns to normal, it allows the linear burner 201 to restart.

[0032] Furthermore, in the above technical solution, a PID controller 11 is provided on one side of the gas valve group 6. An A / D converter and a D / A converter are respectively provided at the input end and the output end of the PID controller 11. Among them, the temperature sensor 7, the flowmeter 8, the first pressure gauge 602, the second pressure gauge 606 and the pressure switch 10 are all electrically connected to the A / D converter. The first solenoid valve 603, the SVP valve + proportional motor 604, the second solenoid valve 607, the third solenoid valve 609, the BVM valve 611, the frequency converter of the blower 5 and the air supply fan 301, and the pressure reducing valve 9 are all electrically connected to the D / A converter.

[0033] Using the PID controller 11 intelligent temperature control instrument, automatic constant temperature control is realized. The common working temperature is 80 - 200 °C at room temperature, which is set according to the thickness of the printed paper. In this embodiment, the temperature in the heating chamber 101 is raised to 160 °C, and it can be adjusted arbitrarily up and down according to the above basic temperature. The temperature control accuracy is ±1 °C, ensuring that the temperature uniformity in the heating chamber 101 is ±3 °C.

[0034] An alarm module is provided at the connection end of the PID controller 11. When the temperature and the timing time exceed the set value, the heating is cut off, and at the same time, a prompt is issued by the buzzer.

[0035] Furthermore, in the above technical solution, ball valves 12 are installed at both the inlet and the outlet of the DN40 gas branch pipe 601; the ball valves 12 are used to control the on / off inside the DN40 gas branch pipe 601. When the ball valve 12 is opened, the gas can pass through smoothly, enabling the linear burner 201 to work normally; when the ball valve 12 is closed, the flow of the corresponding fluid can be cut off. For example, during equipment maintenance, repair or in case of an emergency, the gas supply can be cut off in time to prevent gas leakage and avoid danger.

[0036] A manual flow regulating valve 13 is provided on the gas supply pipe 610 for regulating the flow of gas or combustion-supporting air. By changing the opening degree of the manual flow regulating valve 13, the flow rate of the gas entering the linear burner 201 can be controlled, so as to achieve the purpose of adjusting the combustion power. Increasing the gas flow rate and correspondingly increasing the air flow rate can increase the output heat of the burner to meet different heating requirements.

[0037] Furthermore, in the above technical solution, filters are provided inside the DN40 gas branch pipe 601 and the air delivery pipe 610 to filter impurities in the gas and the combustion-supporting air. The filter can block the particulate impurities therein and prevent these impurities from entering the key components of the linear burner 201, thereby avoiding component wear and blockage and ensuring the normal operation of the gas valve group 6.

[0038] Furthermore, in the above technical solution, a partition is provided between the heating chamber 101 and the machine chamber 102, and the partition is fixedly connected to the inner wall of the furnace body casing 1, and the air supply pipe 303 and the pipe at the input end of the linear burner 201 pass through the partition and are interference fit with the through hole.

[0039] Furthermore, in the above technical solution, a protective net 14 is provided at the front end of the heating chamber 101 and between the far-infrared radiator 202 and the feeding channel 103 to protect the printed paper. When the printed paper is wrinkled or warped, it will not directly contact the linear burner 201 or the far-infrared radiator 202, thereby avoiding the hidden danger of causing fire. A diverter plate 15 is provided at the rear end of the heating chamber 101 and between the wind knife 302 and the feeding channel 103, on which a number of evenly distributed evenly distributed air holes are opened, and a number of evenly distributed air jets are provided at the output end of the wind knife 302, which cooperate with the diverter plate 15 to fully disperse the blown air, so that the hot air is evenly distributed and dries the ink on the printed paper.

[0040] Furthermore, in the above technical solution, multiple groups of the first-level drying mechanism 2 are provided, and the multiple groups of the first-level drying mechanism 2 are axially symmetrically distributed in the two machine positions 102; The number of blowers 5 matches the number of primary drying mechanisms 2, and the multiple linear burners 201 of the primary drying mechanism 2 share one exhaust pipe, and the input end of the blower 5 is connected to the corresponding exhaust pipe; A plurality of DN40 gas branch pipes 601 are all connected to the DN40 gas main pipeline 16, and the DN40 gas main pipeline 16 is connected to an external gas source via a high-pressure pump.

[0041] Furthermore, in the above technical solution, the number of the air blowers 301 and the air knives 302 are both set to be multiple, and the multiple air knives 302 are assembled one-to-one with the air supply pipes 303 set at the output ends of the multiple air blowers 301.

[0042] In this embodiment, 16 gas infrared radiation burners are used, each with a power of 30KW and a total power of 480KW. Fuels such as natural gas, liquefied gas, etc. are mixed with air and burned at the burner head. The heat generated by the combustion causes the combustion products, mainly carbon dioxide and water vapor, to rise in temperature and be in an excited state. These excited gas molecules will release energy outward in the form of infrared radiation. Infrared radiation is an electromagnetic wave. When its frequency matches the vibration frequency of the molecules of the heated object, it can be absorbed by the object, thereby intensifying the molecular motion inside the object and raising the temperature, ultimately achieving the purpose of heating.

[0043] Furthermore, a PID controller 11 intelligent temperature control instrument is used to realize automatic constant temperature control, so that the furnace temperature reaches the set temperature, and then the PID controller 11 adjusts the opening size of the proportional actuator to maintain the furnace temperature at the set temperature. The hot air generated after the gas is fully burned is guided and circulated in the heating chamber 101, which makes full use of the heat, saves energy consumption, and can make the overall temperature inside the heating chamber 101 more uniform; Specifically, in this embodiment, the gas valve group 6 has a manual control mode and an automatic control mode. In the automatic control mode, the probe of the temperature sensor 7 senses the temperature at the feeding channel 103, and feeds back the temperature signal to the PID controller 11, thereby sending a control command to the actuator, including the first solenoid valve 603, the SVP valve + proportional motor 604, the second solenoid valve 607, the third solenoid valve 609 and the BVM valve 611, and the internal aperture of the pipeline leading to the linear burner 201 is reduced, which can not only make the combustion more complete and stable, but also keep the feeding channel 103 at a constant temperature while saving fuel; in the manual control mode, when the temperature at the feeding channel 103 is high, or the paper is thin and does not require too much heat energy, by manually closing part of the manual flow regulating valve 13, the local linear burner 201 can work independently, and the redundant linear burners 201 can be closed arbitrarily, which can meet the actual drying needs while reducing energy consumption and reducing the risk of damage to the paper; The printed paper is guided through the feeding channel 103 so that the printed product can be dried quickly without damaging the paper quality, thereby greatly improving the work efficiency.

[0044] The dual-mode heating design of the gas-fired infrared radiation heating air circulation drying furnace can quickly dry the ink, improve production and quality, and achieve bright colors. The drying furnace reduces VOC gas emissions and has ultra-low nitrogen emissions for nitrogen oxides. The air knife air volume and gas temperature can be set arbitrarily. The temperature control is highly accurate and the energy consumption of natural gas for rapid drying is reduced by 50%. The hot air circulation reutilizes the waste heat from the burner's flue gas, and the overall equipment power consumption is reduced by more than 50% compared to the original equipment.

[0045] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink, comprising a furnace body casing (1), wherein a heating chamber (101) and two machine chambers (102) are arranged inside the furnace body casing (1), wherein the two machine chambers (102) are symmetrically distributed at the top and bottom of the heating chamber (101), wherein an inlet and an outlet penetrating the furnace body casing (1) are respectively arranged on both sides of the middle of the heating chamber (101), and the heating chamber (101) forms a feeding channel (103) between the inlet and the outlet for feeding printing paper therethrough, wherein: A first-stage drying mechanism (2) is provided at the front end of the machine position bin (102) and the corresponding heating bin (101), and a second-stage drying mechanism (3) is provided at the rear end of the machine position bin (102) and the corresponding heating bin (101); An air duct (4) is installed in the machine position bin (102), and a blower (5) is provided at a front end of a side wall of the air duct (4) corresponding to the machine position bin (102); The primary drying mechanism (2) comprises a linear burner (201) and a far-infrared radiator (202), wherein the linear burner (201) is used to burn gas to heat the air in the furnace casing (1), and the far-infrared radiator (202) is installed at the end of the linear burner (201); The secondary drying mechanism (3) comprises an air blower (301) and an air knife (302); the air blower (301) is installed at a position on a side wall of the air duct (4) corresponding to the front end of the machine position bin (102); its input end and the output end of the blower (5) are both connected to the air duct (4); and the air supply direction of the air blower (301) and the blower (5) are opposite, so that the hot exhaust gas produced by the linear burner (201) is pumped to the rear end of the heating bin (101); the output end of the air blower (301) is connected to the air knife (302) via an air supply pipe (303); the air knife (302) is hoisted in the heating bin (101) and symmetrically distributed on both sides of the feeding channel (103); The input end of the linear burner (201) is provided with a gas valve group (6) for adjusting the drying environment in the heating chamber (101).

2. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: The gas valve group (6) comprises: A DN40 gas branch pipe (601) is provided with a first pressure gauge (602), a first solenoid valve (603) and an SVP valve + proportional motor (604) inside, wherein the first pressure gauge (602) is used to test and display the pressure value of the gas inside the DN40 gas branch pipe (601), the first solenoid valve (603) is used to control the opening / closing of the DN40 gas branch pipe (601), and the SVP valve + proportional motor (604) is used to control the flow rate of the gas; An air replenishment pipe (605) is provided with a second pressure gauge (606) and a second solenoid valve (607) inside, wherein the second pressure gauge (606) is used to test and display the pressure value of the air inside the air replenishment pipe (605), and the second solenoid valve (607) is used to control the opening / closing of the air replenishment pipe (605); an air pump (612) is provided at the output end of the air replenishment pipe (605) for pumping air into the air replenishment pipe (605); A premixer (608) is used to premix the gas and air in proportion. The number of premixers (608) is set to be multiple. One end of the multiple premixers (608) is distributed in a linear array and connected to the air supply pipe (605). The other end of the premixer (608) extends to the input end of the corresponding linear burner (201). A third solenoid valve (609) is provided at the connection between the premixer (608) and the input end of the linear burner (201). Each premixer (608) is connected to the DN40 gas branch pipe (601) through an air supply pipe (610). A BVM valve (611) is provided in the premixer (608) for regulating and mixing the gas and air.

3. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 2, characterized in that: The connection ends of the blower (5) and the air supply fan (301) are both provided with frequency converters for controlling the air supply efficiency of the blower (5) and the air supply fan (301); A temperature sensor (7) is provided in the front end of the heating chamber (101) for sensing the temperature at the feeding channel (103); The DN40 gas branch pipe (601) and the gas supply pipe (610) are both provided with flow meters (8) for measuring the flow rates of the gas and the combustion-supporting air, respectively; The premixer (608) is provided with a pressure reducing valve (9) inside, which is used to reduce the higher pressure from the gas source to the pressure range required for the normal operation of the linear burner (201); A pressure switch (10) is provided inside the input end of the linear burner (201) for monitoring and controlling the pressure of the mixed fluid.

4. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 3, characterized in that: A PID controller (11) is provided on one side of the gas valve group (6), and an A / D converter and a D / A converter are provided at the input end and the output end of the PID controller (11), respectively, wherein the temperature sensor (7), the flow meter (8), the first pressure gauge (602), the second pressure gauge (606) and the pressure switch (10) are all electrically connected to the A / D converter, and the first solenoid valve (603), the SVP valve + proportional motor (604), the second solenoid valve (607), the third solenoid valve (609), the BVM valve (611), the frequency converters of the blower (5) and the air supply fan (301) and the pressure reducing valve (9) are all electrically connected to the D / A converter.

5. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 2, characterized in that: The inlet and outlet of the DN40 gas branch pipe (601) are both equipped with ball valves (12); The air supply pipe (610) is provided with a manual flow regulating valve (13) for regulating the flow of fuel gas or combustion-supporting air.

6. A gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 2, characterized in that: The DN40 gas branch pipe (601) and the gas supply pipe (610) are both provided with filters for filtering impurities in the gas and combustion-supporting air.

7. The gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: A partition is provided between the heating chamber (101) and the machine chamber (102), and the partition is fixedly connected to the inner wall of the furnace housing (1), and the air supply pipe (303) and the pipe at the input end of the linear burner (201) pass through the partition and are interference-fitted with the through hole.

8. The gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: A protective net (14) is provided at the front end of the heating chamber (101) and between the far-infrared radiator (202) and the feeding channel (103), and a diverter plate (15) is provided at the rear end of the heating chamber (101) and between the wind knife (302) and the feeding channel (103).

9. The gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: The first-stage drying mechanism (2) is provided with a plurality of groups, and the plurality of groups of first-stage drying mechanisms (2) are axially symmetrically distributed in the two machine positions (102); The number of the blowers (5) matches the number of the primary drying mechanisms (2), and the multiple linear burners (201) of the primary drying mechanisms (2) share one exhaust pipe, and the input end of the blower (5) is connected to the corresponding exhaust pipe; A plurality of DN40 gas branch pipes (601) are all connected to a DN40 gas main pipeline (16), and the DN40 gas main pipeline (16) is connected to an external gas source via a high-pressure pump.

10. The gas-fired infrared radiation hot air dual-mode drying furnace for drying printing ink according to claim 1, characterized in that: The number of the air blowers (301) and the air knives (302) is set to be multiple, and the multiple air knives (302) are assembled in a one-to-one correspondence with the air supply pipes (303) provided at the output ends of the multiple air blowers (301).

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