Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2

Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2(Heavy metal digestion furnace)

1. Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Characteristics of heavy metal digestion furnace:

Far infrared quartz heating element uses milky white quartz tube as the infrared radiation source, without coating, pollution, harmful radiation, good chemical stability, long-term use without deformation, good thermal stability, feasible heating temperature selection, and minimal thermal inertia.

Characteristics of Infrared Quartz Programmed Heating Digestive Furnace SKD-20S2
1Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2The module adopts infrared quartz tube, which is resistant to strong acids and alkalis, anti explosion, has a long service life, and meets CE standards

2Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2The temperature of the furnace hole is continuously adjustable, and the heating speed is fast

3Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2The digestive tract has a large heating area and small temperature difference, which results in good digestion of the sample and high thermal efficiency, which is beneficial for the digestion of the sample

4Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2The instrument has overcurrent protection and leakage protection

5Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Using 2 switches, power and heating are separately controlled for easy safety parameter setting

6Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Adopting the new generation PID intelligent control technology, with high temperature control accuracy

7Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2The instrument is equipped with a stainless steel drain cover, which allows harmful gases such as SO2 that escape from the digestive tract to be discharged into the sewer through the suction pump via the drain pipe, effectively suppressing the escape of harmful gases

8Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Overview of Heavy Metal Digestive Furnace:
The infrared program-controlled digestion furnace SKD-20S2 can be used in agriculture, forestry, environmental protection, geology, chemical industry, food and other departments, as well as in higher education institutions and scientific research departments for the digestion of plants, seeds, feed, food, soil, ores, etc

9Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Technical indicators of heavy metal digestion furnace:
Model SKD-20S2
Control mode microcontroller (timed+64th order programmed heating)
Heating method: Infrared quartz heating tube radiation
Number of furnace holes: 20 holes
Temperature control range: Room temperature -680 ℃

Heating rate for 20 minutes (from room temperature to 400 ℃)

Temperature fluctuation ± 1 degree

Double layer insulation: Aluminum silicate and air double-layer insulation

Voltage AC220V
Power 2.2KW

10Infrared quartz programmed heating 20 hole digestion furnace SKD-20S2Characteristics of heavy metal digestion furnace:
1. Temperature rise is controllable, eliminating the phenomenon of digestion and wall hanging, and achieving good sample recovery rate.
2. The heating element (module) adopts infrared quartz tube, which is resistant to strong acids and alkalis, anti explosion, has a long service life, reduces maintenance costs, and meets CE standards.
3. The furnace hole temperature is continuously adjustable, with a fast heating rate and no wall hanging.
4. The digestive tract has a large heating area, small temperature difference, good sample digestion, and high thermal efficiency.
5. The instrument has overcurrent protection and leakage protection to protect personal safety.
6. Using two switches, the power and heating are separately controlled for easy safety parameter setting and energy conservation.
7. Adopting a new generation of temperature display and control instrument, PID intelligent control technology, high temperature control accuracy, simple and easy to learn
8. The instrument is equipped with a stainless steel drain cover, which allows harmful gases such as SO2 that escape from the digestive tract to be discharged into the sewer through the suction pump via the drain pipe, effectively suppressing the escape of harmful gases

9. Sample anti riot device (optional).

11. Principle of Quartz Tube Structure

The far-infrared quartz heating element adopts a pearl milk white quartz tube combined with an electric heating material, which gives the original component excellent and reliable far-infrared radiation characteristics. After being powered on, 97% of the infrared light and visible light emitted by the thermal material are blocked and absorbed by the milk white tube, causing the temperature of the tube wall to rise and producing silicon oxygen bond molecular vibration radiation far-infrared. This allows 97% of visible light and near-infrared light to be converted into far-infrared radiation, effectively converting electrical energy into far-infrared radiation.

12. The influence of heat conduction medium in digestion furnace on digestion quality

The digestion furnace is a major energy consumer in the laboratory, and it also determines the quality of nitrogen. The power of an aluminum ingot or graphite 20 hole digestion furnace is generally around 3500W (the power of a Peio quartz radiation digestion furnace is 2200W), and it usually works for more than two hours. How to reduce energy consumption while meeting the requirements of digestion is a consideration when choosing a digestion furnace. At present, the digestive furnaces supplied in the domestic market are heated by electric heating, and heat conduction is carried out through the medium to the digestive tube. Therefore, different media have a direct relationship with the quality and energy consumption of the digestive furnace. Here, we discuss the characteristics of different media (assuming that the insulation of the digestive furnace is good).

Aluminum ingot as the medium

Advantages: Aluminum ingots have fast thermal conductivity (with a thermal conductivity coefficient of up to 237W/mK), and high thermal conductivity results in small temperature differences between samples. If there is sufficient volume of aluminum ingot, it can ensure the stability of sample temperature and reduce temperature fluctuations. Even if it comes into contact with sulfuric acid, a dense layer of aluminum sulfate will be generated, which will not penetrate into the interior of the aluminum ingot. Therefore, aluminum ingot is also a good choice for corrosion prevention.

Disadvantages: Aluminum ingots are conducted through thermal contact, and in order to maintain a constant temperature, they must have a sufficiently large volume (thin aluminum ingots have poor effects). The visible and near-infrared light generated by electric heating are not utilized, resulting in low thermal energy utilization efficiency and high energy consumption.

Due to the stability of aluminum ingots and the small temperature difference between samples. Recognized by the market. The heating method and the size of the aluminum ingot both affect the quality of the digestion furnace, and will not be discussed here

2 graphite as the medium

Advantages: The price of aluminum ingots of the same volume is three times that of graphite, so the cost of graphite digestion furnaces is significantly lower.

Disadvantage: Due to the non-metallic nature of graphite, its thermal conductivity is slow (with a thermal conductivity of only 129W/m.k, much lower than aluminum ingots with 237W/m.k). ）Moreover, the thermal conductivity of graphite decreases with increasing temperature, which leads to uneven temperatures and large temperature differences in the digestion tubes above the medium, making them prone to wall sticking and affecting digestion quality. So graphite can generally be used as a conductive medium below 200 degrees Celsius, as it has a price advantage. However, the thermal conductivity of graphite decreases significantly above 400 degrees Celsius, and the disadvantages of graphite are clearly evident. The cost of price advantage is a significant decrease in digestion quality and severe wall hanging.

3. Infrared quartz radiation heating

The quartz heating element uses a pearl milk white quartz tube paired with an electric heating material, which has excellent and reliable far-infrared radiation characteristics. After being powered on, 97% of the infrared and visible light waves emitted by the resistance wire are blocked and absorbed by the milk white tube, causing the temperature of the quartz tube wall to rise and generating silicon oxygen bond molecular vibration radiation to emit far-infrared light waves. This allows 97% of visible and near-infrared light to be converted into far-infrared radiation. Overcoming the drawbacks of using only transparent quartz glass to transmit visible and near-infrared light, effectively converting electrical energy into far-infrared light waves.

Heating samples by thermal radiation is characterized by fast heating, small temperature difference between samples, extremely fast conduction, and accurate temperature control. Generally used for digestion of samples with high requirements, such as milk, food, feed, health products, and other samples that are prone to wall sticking. For example, there is a faster rate of heating and cooling. Program heating can select the heating curve based on the characteristics of the sample, which is beneficial for the digestion of high-quality samples, thereby eliminating the phenomenon of sample wall hanging and greatly improving the efficiency of sample digestion,

Advantages: The temperature difference between samples is small, and the use of thermal radiation reduces the temperature difference between digestive tubes.

Excellent temperature control performance: Due to the small thermal inertia of quartz radiation, the temperature overshoot during temperature control is small, which can quickly reach the target temperature of the furnace, which is incomparable to aluminum ingots and graphite media.

Reduce energy consumption: Due to the contact conduction between aluminum ingots and graphite, and the inability to utilize a large amount of visible and near-infrared light, energy is wasted. Quartz radiation utilizes 97% of visible and near-infrared light waves to convert into far-infrared light waves, resulting in high efficiency in electrical and thermal energy conversion.

Due to the stable chemical properties of quartz, even when in contact with sulfuric acid, it does not affect the functionality of quartz and has high-quality anti-corrosion properties, extending the service life of electric heating wires. The large thermal inertia of graphite leads to a large temperature overshoot, resulting in a significant temperature difference between the surface temperature of the resistance wire and graphite, which shortens the lifespan of the resistance wire and makes it prone to breakage. The radiation characteristics of quartz at a certain temperature determine the limitation of the surface temperature of the resistance wire, resulting in a small temperature difference between the digestive tract and the resistance wire, and a significant extension of the resistance wire's lifespan.

Disadvantages: Due to the high processing requirements and production costs of pearl milk white quartz tubes, but due to their low usage costs (compared to aluminum ingots and graphite), quartz radiation heating has a high cost-effectiveness over the long term and is increasingly favored by customers. The above is only a discussion of the impact of various media on the quality of digestion furnaces.

SKD-20S2 aluminum ingot dielectric graphite dielectric
Heating power (W) around 2200 3500 3500
Heating rate
(400 degrees) 20 points 35-40 points 35-40 points
Insulation power 25% -80% rated power 65% -80% rated power 65% -80% rated power
Thermal conductivity at the speed of light 237W/mk 129W/mk (decreases with increasing temperature)
Temperature uniformity infrared radiation, uniform and non-uniform (conduction temperature difference)
About 40% energy savings compared to energy consumption
Temperature control method: Program heating--------
There may be a small amount of wall hanging phenomenon if there is no wall hanging phenomenon

How to choose a digestive furnace

The digestion furnace plays a very important role in protein detection, and choosing a suitable digestion furnace is a prerequisite for accurate detection.

Shanghai Jinghe welcomes new and old customers

Several points should be noted for the indicators of the digestion furnace:

1. The temperature should be constant, with minimal fluctuations, and each sample can have * digestion time,

The temperature of each sample well should be * to avoid significant differences in sample digestion time.

3. It can effectively control the process of temperature changes to prevent the sample from hanging on the wall during digestion.

4 effective insulation measures to improve the stability of the temperature inside the furnace chamber

So the inspection of the digestion furnace needs to pay attention to:

*Effective temperature control enables digestion to be controlled as needed, and if there is program temperature control, it can effectively achieve the desired temperature.

*A good insulation measure, if the insulation material is weak, it will inevitably cause temperature instability. A thicker insulation layer for the instrument is necessary for temperature stability. Therefore, the thickness and material of insulation materials are important indicators

*The selection of heating element and heat carrier can be based on the user's needs to choose different heat carriers. Next, we will discuss the selection of heating elements and heat carriers.

There are mainly two good ways to heat up now.

#Infrared heating relies on thermal radiation to heat the sample, characterized by fast heating, low thermal inertia, and accurate temperature control. Generally used for digestion of samples with high requirements. For example, there is a faster rate of heating and cooling. Program heating can enable users to choose heating curves that are more specific to their sample characteristics, or to choose segmented heating, which is more beneficial for sample digestion, thereby eliminating the phenomenon of sample wall hanging and greatly improving the efficiency of sample digestion

#Aluminum ingot heating relies on the conduction of heat from the aluminum ingot to the sample. Its characteristics include slow heating, large thermal inertia, stable temperature, and good thermal conductivity between each sample hole. Widely used as a heat carrier in digestion furnaces, but it should also be noted that even a thin aluminum ingot cannot maintain a constant temperature. Therefore, when choosing an aluminum ingot digestion furnace, the thickness of the aluminum ingot is also an evaluation indicator.

#Graphite heating relies on the conduction of heat from graphite to the sample. Its characteristics include high thermal inertia and slow temperature rise. Due to the poor thermal conductivity of graphite (compared to aluminum ingots), the temperature between sample pores is uneven, which can easily lead to prolonged digestion time between samples. However, due to the low cost of graphite and the cheap cost of graphite digestion furnaces, it has a certain appeal to some low-end users.
Attention should be paid to the protective function of the digestion furnace:

Temperature stability and uniform protection, overcurrent and short-circuit protection