According to the fuel difference, the incinerator can be divided into three types: coal powder incinerator, oil incinerator and good body incinerator. The incinerator is also called incinerator, which can be divided into fuel oil incinerator and gas incinerator according to the fuel; kiln incinerator and boiler incinerator according to the application tools; industrial incinerator, civil incinerator and special incinerator according to the application platform. In this case, the fuel oil incinerator is divided into light oil (such as diesel oil) and heavy oil incinerator (such as waste oil). The gas incinerator is divided into natural gas incinerator, liquefied gas incinerator, metropolitan gas incinerator, biogas incinerator, etc. What we mean by incinerator is boiler incinerator.
Pulverized coal incinerator
It can be divided into swirl type and direct current type.
(1)
Swirl type pulverized coal incinerator: it is mainly composed of primary air cyclone, secondary air regulating baffle (swirl blade or volute) and primary and secondary air nozzles. It can be installed in the front wall, double side wall or front and back wall of the incinerator. The atmosphere for transporting pulverized coal is called primary air, which accounts for about 15-30% of the total air volume required for incineration. The inclusions in the pulverized coal atmosphere are injected into the combustion chamber through the primary air nozzle of the incinerator. Another one-sided atmosphere required for incineration is called secondary air. After the secondary air passes through the regulating baffle (swirl blade or volute) of the incinerator, it will cause a twisted air flow. At the outlet of the incinerator, the secondary air and the primary air will form a twisted jet. The negative pressure in the middle of the jet draws the high temperature flue gas to the root of the flame. This one-sided high-temperature flue gas is an important heat source for ignition of pulverized coal. The diffuser cone at the outlet of primary air can increase the evacuation angle of primary air, so as to enhance the entrainment of high temperature flue gas.
II.
DC type pulverized coal incinerator: it is generally composed of geometric group primary and secondary air nozzles arranged along the height, and is installed on each corner of the incinerator. The middle line of the incinerator is tangent to an imaginary circle in the middle of the incinerator, so it can cause a reverse updraft in the incinerator. The primary and secondary air nozzles of each group of DC incinerators are evacuated and installed to meet the requirements of different types of coal consolidation and thorough incineration. Occasionally, the production of NOx is also considered to be reduced.
Oil incinerator
The fuel oil incinerator should adopt atomization technology. The atomization principle of KMY bubble atomizer is: fuel oil and atomization medium (water vapor or contraction atmosphere) produce a large number of oil-in-oil bubbles through the bubble atomizer generator, and spray out after the inclusion chamber is full of inclusions. Because of the high pressure difference, blasting atomization is completed. According to the laser test in the Key Laboratory of national defense science and technology, the atomized particle sotel equilibrium diameter SMD is less than or equal to 23.76 μ m, which can not be achieved by ordinary pneumatic atomization and machine atomization nozzles. It is a new fuel atomization and incineration technology.
In addition to the swirl type and DC type similar to the pulverized coal incinerator, the air conditioner of the oil incinerator also has a one-sided swirl type, that is, a flame stabilizer is installed in the DC type air conditioner to make a small batch of atmosphere (10-20%) flow through the flame stabilizer and produce a twisting action, and a middle return area is created at the outlet of the air conditioner to make the oil mist ignite and consolidate so as to reach the low oxygen incineration.
Gas incinerator
It is important to have two types of natural gas incinerator and blast furnace gas incinerator. Large capacity natural gas incinerators mostly accept multi gun intake advection type. The natural air gun is placed in the atmosphere channel of the air conditioner. Because of the low fever and difficult ignition problem of the blast furnace gas incinerator, it is often burned in the hot channel and then injected into the incineration chamber.
Biomass pellet fuel
In order to deeply study the burning characteristics of biomass particle fuel and explore the fuel compliance of the active incinerator, based on pb-20 type biomass particle incinerator, five kinds of particulate fuel with ash content less than 25% (air dried basis) were selected, and the effects of feed amount and atmosphere amount on the incineration function were divided and studied. The test results show that the granular fuel with ash content more than 20% is not enough to be incinerated, the working condition is not consolidated, it is subject to low, slagging is large, and it is easy to shut down, so it is not suitable for this kind of bio fuel pellet incinerator; the recommended parameter of the granular fuel with ash content of 12.40% is feed quantity 4
Kg / h, fan speed 2600-2800 R / min, slag removal rate 3 R / min, turning 5 S / stop 35 s; the recommended control parameters for particulate fuel with ash content of 7.21% are feed volume 3-4 kg / h, fan speed 2600-2800
R / min, the corresponding slag removal rate is 3 R / min, 5 S / stop for 60-55 s; for particulate fuel with ash value lower than 1%, the feed volume is 3-4 kg / h, and the fan speed is 2600-2800
R / min, no slag cleaning is recommended. This research summarizes the fuel parameters of the biomass particle incinerator, which provides data support for the implementation of the incinerator.
——Author：ebico