Arrangement structure of grain drying hot-blast stove with nanocrystalline infrared heating tubes

Abstract

The invention discloses an arrangement structure of a grain drying hot-blast stove with nanocrystalline infrared heating tubes, and belongs to the technical field of drying of grains or agricultural and sideline products. The hot blast stove comprises a nanocrystalline far infrared ray heating tube array, an infrared ray energy absorption fin-shaped heat dissipation plate, a bidirectional silicon controlled rectifier constant temperature power control system, a plurality of positive pressure air supply fans, a hot air output air duct and a numerical control intelligent control and protection system. Non-luminous far infrared radiation heat energy is generated through the nanocrystalline infrared heating tube and is matched with the energy absorption fin-shaped heat dissipation plate to efficiently absorb and dissipate heat energy, hot air is formed and then sent into the dryer through the fan, efficient, energy-saving and environment-friendly drying of grains or agricultural and sideline products is achieved, and the grain dryer has the advantages of being high in heat efficiency, accurate in temperature control, free of pollution, long in service life and the like.

Description

Technical Field

[0001] This invention relates to the field of grain or agricultural by-product drying, and in particular to a grain drying hot air furnace arrangement structure using nanocrystalline infrared heating tubes. Background Technology

[0002] Nanocrystalline infrared heating elements are a relatively new type of heating element that has emerged in the last two years, following traditional heating elements such as metal tubes, quartz tubes, halogen tubes, and ceramic tubes. Their superior performance is increasingly welcomed by customers both domestically and internationally. The heating element—nanocrystalline—possesses advantages such as large power margin, high temperature resistance, strong heating capacity, long service life, and adjustable power, earning it the reputation of being "the most competitive high-tech material of this century." Its emergence has sparked a new revolution in the field of electrothermal heating, and the replacement of metal heating elements with nanocrystalline infrared heating elements is becoming an inevitable trend.

[0003] Nanocrystalline infrared heating tubes are a high-tech product that differs from traditional electric heating tubes and infrared heating tubes such as metal wires and halogen infrared tubes. They have excellent properties such as long service life, high electrothermal conversion efficiency, no light emission and far-infrared radiation, and health and environmental protection.

[0004] Grain and agricultural product drying is widely used and promoted in China, but how to achieve energy saving, high efficiency, and environmental protection in batch circulating grain dryers has always been a problem that needs further research and development. Traditional dryers use heating energy sources such as coal, biomass, natural gas, diesel, electric heating elements, and air source heat pumps. These energy-based drying methods suffer from low efficiency, significant energy waste, high investment costs, extremely high maintenance costs, and are prone to secondary pollution. This patent mainly develops a "nanocrystalline infrared heating tube grain drying hot air furnace," which is highly efficient, environmentally friendly, and energy-saving, while also improving the quality of dried grains and agricultural products. Summary of the Invention

[0005] To address the aforementioned problems, this invention discloses a grain drying hot air furnace arrangement structure with nanocrystalline infrared heating tubes, which is highly efficient and energy-saving, compact in structure, and has a long service life.

[0006] A hot air furnace arrangement structure for grain drying using nanocrystalline infrared heating tubes includes a furnace body, with a hot air output channel at the air outlet and several positive pressure blowers at the air inlet; it also includes a digital intelligent control and protection system and a bidirectional silicon-controlled rectifier constant temperature power control system; the furnace body is equipped with a heating section; the heating section includes a nanocrystalline far-infrared heating tube array, which is composed of several nanocrystalline far-infrared heating tubes arranged side by side.

[0007] Furthermore, the infrared energy-absorbing finned heat sink is pressed into a concave-convex shape, and the infrared energy-absorbing finned heat sink is clamped by a fixture and a high-temperature resistant insulating strip is used to maintain a safe distance from the nanocrystalline far-infrared heating tube.

[0008] Furthermore, the positive pressure air supply fans are arranged in parallel.

[0009] Furthermore, the bidirectional thyristor constant temperature power control system receives instructions from the numerical control intelligent control and protection system and adjusts the input power of the nanocrystalline far-infrared heating tube array through phase angle control.

[0010] Furthermore, the infrared energy-absorbing finned heat sink is made of heat-treated blackbody carbon steel, which has the characteristics of energy absorption, high temperature resistance, non-deformation, and rust resistance.

[0011] The heating tubes of this invention are arranged in an array at a certain spacing, and the nanocrystalline layer on their tube walls generates far-infrared radiation of a specific wavelength after being energized. The infrared energy-absorbing finned heat sink is preferably made of heat-treated blackbody carbon steel, and its function is to efficiently absorb radiation energy and convert it into heat energy, while simultaneously achieving efficient convective heat exchange with the flowing air through its large surface area. The forced airflow generated by the fan blows perpendicularly or parallel to the axis of the heating tubes toward the heating core, where the heat energy generated by infrared radiation is fully dissipated by the infrared energy-absorbing finned heat sink, and then carried away by the fan.

[0012] Nanocrystalline infrared heating element: The tubular heating element has a ceramic composite tube as its base material and a nanocrystalline layer coated on the surface of the base material. The heat-treated blackbody carbon steel can effectively absorb infrared rays, rather than just reflecting them like ordinary metals.

[0013] The beneficial effects of this invention are: 1. An array of N nanocrystalline infrared heating tubes is set up, and the thermal power can be expanded indefinitely.

[0014] 2. An energy-absorbing finned heat sink is installed. The energy-absorbing finned heat sink is made of heat-treated blackbody carbon steel, which can fully absorb infrared heat energy and dissipate heat energy, greatly improving the heat exchange efficiency.

[0015] 3. The system is equipped with a bidirectional thyristor intelligent switch control, which avoids the high energy consumption caused by peak current input during power switching, and is an important part of energy saving.

[0016] 4. The nano-microcrystalline infrared heating tube grain drying hot air furnace does not require an air medium and does not consume oxygen. It can directly radiate into the grain and directly generate hot air to dry the grain, thus improving the drying rate.

[0017] 5. Nanocrystalline infrared heating and drying does not damage the intrinsic quality of grains, does not produce secondary pollution, and ensures the original flavor and high quality of grains. Nanocrystalline infrared heating and drying is also suitable for drying wheat, corn, oatmeal, tea, chrysanthemum, dehydrated vegetables, Chinese medicinal herbs, and other agricultural and sideline products. Attached Figure Description

[0018] Figure 1 A schematic diagram of the structure of the present invention; Figure 2 Cross-sectional view of the structure of this invention.

[0019] Among them, 1-nano-microcrystalline far-infrared heating tube; 2-nano-microcrystalline far-infrared heating tube array; 3-infrared energy-absorbing finned heat sink; 4-bidirectional thyristor constant temperature power control system; 5-positive pressure air supply fan; 6-hot air output duct; 7-digital intelligent control and protection system; 8-high temperature resistant insulation strip; 9-box body. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0021] See Figure 1 and Figure 2 The invented hot air furnace has an external insulated box. Its core is located inside the box 9, where multiple nanocrystalline far-infrared heating tubes 1 are arranged in parallel at a certain interval, forming a nanocrystalline far-infrared heating tube array 2. An infrared energy-absorbing finned heat sink 3 is installed at the bottom of the nanocrystalline far-infrared heating tube array 2. The infrared energy-absorbing finned heat sink 3 is made of heat-treated blackbody carbon steel, which efficiently captures the far-infrared radiation emitted by the heating tubes due to its high absorption rate and converts it into heat energy. The finned energy-absorbing heat sink greatly increases the heat exchange area.

[0022] The infrared energy-absorbing finned heat sink 3 is pressed into a concave-convex shape. The infrared energy-absorbing finned heat sink 3 is clamped by a fixture and a high-temperature resistant insulating strip 8 is used to maintain a safe distance from the nanocrystalline far-infrared heating tube 1.

[0023] Two positive pressure air supply fans 5 are installed side by side. When the fans are started, ambient air is forced in and flows through the heating zone, which has a narrow flow channel and consists of nanocrystalline far-infrared heating tubes 1 and infrared energy-absorbing finned heat sinks 3. The air is rapidly and evenly heated during the flow; the heated clean hot air is collected at the other end of the housing and enters the hot air output duct 6, and is then transported to an external grain dryer, such as a batch circulating dryer.

[0024] The bidirectional thyristor constant temperature power control system 4 is installed in the electrical cabinet. It monitors the air temperature in real time through a Pt100 temperature sensor installed in the hot air output duct 6 and compares it with the target temperature set by the numerical control intelligent control and protection system 7. By adjusting the conduction angle of the bidirectional thyristor, the average power applied to the nanocrystalline far-infrared heating tube array 2 is steplessly adjusted, thereby achieving precise closed-loop control of the air outlet temperature.

[0025] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A grain drying hot air furnace arrangement structure with nanocrystalline infrared heating tubes, comprising a furnace body, wherein the air outlet end of the furnace body is provided with a hot air output channel (6) and the air inlet end is connected to a plurality of positive pressure blowers (5); characterized in that: It is also equipped with a numerical control intelligent control and protection system (7) and a bidirectional thyristor constant temperature power control system (4); the furnace body is equipped with a heating part; the heating part includes a nano-microcrystalline far-infrared heating tube array (2) and an infrared energy-absorbing finned heat sink (3) located below the nano-microcrystalline far-infrared heating tube array (2); the electrodes of the nano-microcrystalline far-infrared heating tube array (2) are connected to the bidirectional thyristor constant temperature power control system (4); the nano-microcrystalline far-infrared heating tube array (2) is composed of several nano-microcrystalline far-infrared heating tubes (1) arranged side by side.

2. The arrangement structure of a grain drying hot air furnace with nanocrystalline infrared heating tubes according to claim 1, characterized in that: The infrared energy-absorbing finned heat sink (3) is pressed into a concave-convex shape. The infrared energy-absorbing finned heat sink (3) is clamped by a clamp and a high-temperature resistant insulating strip (8) is used to maintain a safe distance from the nanocrystalline far-infrared heating tube (1).

3. The arrangement structure of a grain drying hot air furnace with nanocrystalline infrared heating tubes according to claim 1, characterized in that: The positive pressure air supply fans (5) are arranged in parallel.

4. The arrangement structure of a grain drying hot air furnace with nanocrystalline infrared heating tubes according to claim 1, characterized in that: The bidirectional thyristor constant temperature power control system (4) receives instructions from the numerical control intelligent control and protection system (7) and adjusts the input power of the nanocrystalline far-infrared heating tube array (2) through phase angle control.

5. The arrangement structure of a grain drying hot air furnace with nanocrystalline infrared heating tubes according to claim 1, characterized in that: The infrared energy-absorbing finned heat sink (3) is made of heat-treated blackbody carbon steel.

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