PCB Blog - What is stealth burner pcb?

A stealth burner is a device that sprays fuel and air in a certain way for mixed combustion. Burners are divided into industrial burners, combustion engines, civilian burners, and special burners according to their types and application fields. It is often made of corrosion-resistant and high-temperature-resistant materials such as stainless steel or titanium metal.

Stealth burner

Working principle of stealth burner

The atomized test solution enters the combustion machine, and under the action of flame temperature and flame atmosphere, through drying, melting, evaporation, dissociation and other processes, a large number of ground state atoms, as well as some excited state atoms, ions and molecules are generated. A well-designed combustion engine should have high atomization efficiency, low noise, and flame stability to ensure high absorption sensitivity and measurement precision. In atomic absorption spectroscopy analysis, the atomic vapor is usually produced by a slit burner. According to the types of gas and auxiliary gas used, the length and width of the gap in the combustion engine vary. Generally, applicable gas and auxiliary gas are marked on the combustion engine.

Stealth burner characteristics

1. High thermal efficiency: able to adapt to pressure fluctuations, self-adjust the primary air distribution (i.e. high gas pressure leads to more intake of primary air; low gas pressure leads to less intake of primary air), fully combustion, and high thermal efficiency;

2. High safety: This burner is equipped with a low fire. When starting the boiler, light a small fire first. Only when the small fire burns normally and stably can the automatic control system open the main gas valve, and the fuel can enter the boiler for normal combustion without causing deflagration;

3. Strong fuel adaptability: This type of burner can be suitable for natural gas, liquefied petroleum gas, coal gas, liquefied petroleum gas mixture, and other types of gas with only a small amount of replacement parts.

Stealth burners can be divided into three categories based on the different fuels they burn: coal powder burners, oil burners, and gas burners. Burners, also known as combustion engines, can be divided into fuel burners and gas burners based on fuel; According to the object of use, it is divided into kiln burners and boiler burners; According to the application field, it can be divided into industrial burners, civilian burners, and special burners. Among them, fuel burners are divided into light oil (such as diesel) and heavy oil burners (such as waste engine oil), while gas burners are divided into natural gas burners, liquefied gas burners, urban gas burners, biogas burners, etc. The burner we usually refer to is a boiler burner.

Pulverized coal burner

There are two types of coal powder burners: swirl type and direct flow type.

① Swirl type coal powder burner: mainly composed of a primary air cyclone, a secondary air regulating baffle (swirl blade or volute), and a primary and secondary air nozzle. It can be arranged on the front wall, side walls, or front and rear walls of the combustion chamber. The air used to transport coal powder is called primary air, which accounts for approximately 15-30% of the total air volume required for combustion. The coal powder air mixture is sprayed into the combustion chamber through the primary air nozzle of the burner. The other part of the air required for combustion is called secondary air. The secondary air passes through the regulating baffle (swirl blade or volute) of the burner to form a rotating airflow, which merges with the primary air at the outlet of the burner to form a rotating jet. The negative pressure formed at the center of the jet sucks the high-temperature flue gas up to the root of the flame. This portion of high-temperature flue gas is the main heat source for coal powder ignition. The diffuser cone at the primary air outlet can increase the diffusion angle of the primary air to enhance the entrainment effect of high-temperature flue gas. 

② Direct flow pulverized coal burner: generally composed of several sets of primary and secondary air nozzles arranged along the height, arranged at each corner of the combustion chamber. The centerline of the burner is tangent to an imaginary circle in the center of the combustion chamber, thus forming a horizontally rotating upward airflow in the combustion chamber. The primary and secondary air nozzles of each group of direct flow burners are distributed to meet the requirements of stable and complete combustion of different coal types, and sometimes reducing the generation of nitrogen oxides is also considered.

Oil burner

The fuel burner mainly adopts atomization technology, and the atomization principle of the KMY bubble atomization burner is: the fuel and atomization medium (water vapor or compressed air) generate a large number of oil and steam bubbles through the bubble atomization generator, which is fully mixed in the mixing chamber and sprayed out. Due to the high-pressure difference, explosive atomization is achieved. According to laser testing conducted by the Key Laboratory of Aerodynamics, Thermodynamics, and National Defense Science and Technology of Aviation Engines, the average diameter of atomized particles, Sottel, SMD ≤ 23.76 μ m. This is a new fuel atomization combustion technology that cannot be achieved by general pneumatic atomization and mechanical atomization nozzles. 

In addition to the swirling and direct current types similar to coal powder burners, there is also a partial swirling type of air regulator for oil burners, which includes a flame stabilizer arranged inside the direct current type air regulator. This allows a small amount of air (10-20%) to flow through the flame stabilizer and generate rotational motion, forming a central reflux zone at the outlet of the air regulator to stabilize the ignition of the oil mist and achieve low oxygen combustion.

Gas burner

Gas burners mainly include natural gas burners and blast furnace gas burners. Large-capacity natural gas burners mostly use multi-nozzle intake horizontal flow type. The natural gun is placed in the air channel of the air conditioner. The blast furnace gas burner is difficult to ignite due to its low heat generation and often burns in a hot channel before being sprayed into the combustion chamber.

PCB biomass pellet combustion burner

1. Principle

The biomass particle fuel enters the high-temperature cracking semi-gasification combustion chamber through the feeding system, and the gasification agent is supplied from the lower part of the furnace. In the high-temperature cracking gasification combustion chamber, a high-temperature cracking reaction occurs quickly to produce high-temperature gas. During this process, combustible components such as a "wet hot mixture" (H2, CH4, CNHM, CO) are generated, which enter the aerobic space or high-temperature combustion chamber through the gas nozzle for complete combustion, and the generated heat energy is fully utilized.

2. Features

1. Efficient and energy-saving: Using renewable biomass energy as fuel, with low operating costs and a 30-60% reduction in operating costs compared to fuel (gas).

2. High thermal efficiency: Tangential swirl air distribution design, forming boiling semi-gasification low-temperature segmented combustion, with a combustion rate of over 90%.

3. Stable and reliable: micro positive pressure operation, without tempering and detachment;

4. Low carbon environmental protection: Low emissions of smoke, sulfur and nitrogen, zero emissions of carbon dioxide, meeting the requirements of GB13271 for smoke and dust emissions.

5. Easy operation: Adopting automatic feeding, easy operation and low workload.

6. Obvious pollution-free environmental benefits: using renewable biomass energy as fuel has achieved sustainable energy utilization. Adopting low-temperature segmented combustion technology, it has low emissions of flue gas, sulfur oxides, dust, and other pollutants, making it an excellent alternative to other existing energy sources.

7. No discharge of various waste such as tar and wastewater: Adopting high-temperature gas direct combustion technology, tar is directly burned in a gaseous form, solving the technical problem of high tar content in biomass gasification and avoiding secondary pollution caused by washing tar with water.

8. Widely used and low operating cost: This product can be widely used for supporting and energy-saving transformation of other thermal energy equipment such as drying pipelines, ovens, boilers, die-casting machines, industrial furnaces, drying equipment, etc.

Stealth burners are essential equipment in modern society, with a wide range of applications.