Abstract: An example exhaust gas filter for a reflow oven comprises a filter chamber, a filtering piece and a vapor chamber. An upper transverse passage is formed between the vapor chamber top plate and the filter element, a gap is formed between one side of the top plate and the sidewall of a filter chamber, and the upper transverse passage is in fluid communication with the gap; one filter chamber sidewall forming a gap with the top plate is disposed with a filter chamber air inlet for introducing air, and one of the other three sidewalls of the filter chamber is disposed with an exhaust gas inlet for introducing exhaust gas from the exhaust gas filter chamber, so that the air and the exhaust gas can enter the upper transverse passage through the gap.

Abstract: A Fluid Catalytic Cracking process converts heavy crude oil fractions into lighter hydrocarbon products at high temperature and moderate pressure in the presence of a catalyst. During this process, catalyst particles stay entrained in the descending gas stream. An inlet scroll on the cyclone may be used to keep the inlet gas stream and the entrained particles away from the entrance to the gas outlet tube. Refractory material may applied to the interior of the wall of the cyclone to form an abrasion resistant lining to insulate the walls of the cyclone from the gas flow contents. The inlet feed velocity may be used as a predictive factor to determine a wear rate of the cyclones. Thus, lining erosion can be predicted so that the lining can be repaired or replaced during a planned turnaround.

Abstract: A filtering apparatus for a reflow oven includes a contaminated-gas inlet for receiving contaminated gas from a reflow oven; a filtering device configured to filter the received contaminated gas; a returned gas outlet for returning filtered gas to the reflow oven; a gas removal arrangement for allowing gas to escape from the apparatus; and a control arrangement for controlling the rate of gas flow through the gas removal arrangement such that in use the flow rate of contaminated gas flowing from a hotter region of the reflow oven to a cooler region of the reflow oven is controlled.

Abstract: A filtering apparatus for a reflow oven includes a contaminated-gas inlet for receiving contaminated gas from a reflow oven; a filtering device configured to filter the received contaminated gas; a returned gas outlet for returning filtered gas to the reflow oven; a gas removal arrangement for allowing gas to escape from the apparatus; and a control arrangement for controlling the rate of gas flow through the gas removal arrangement such that in use the flow rate of contaminated gas flowing from a hotter region of the reflow oven to a cooler region of the reflow oven is controlled.

Abstract: A two-stage filtration system is coupled with an oven, such as a solder reflow oven, to remove a vapor stream from the oven and to remove organic compounds that have volatilized from a solder flux and other contaminants from the vapor stream. The filtration system includes a first stage for trapping larger particles and a second stage including a packed bed of wettable media, such as steel balls, for trapping smaller particles and serving as a nucleation site for condensed organic compounds. The first stage can be a centrifugal self-cleaning element in the form of a mesh strainer coupled with a rotary motor for spinning the mesh strainer.

Abstract: A reflow soldering device extracts a vaporized component of a contaminative material, such as flux, from exhaust gas from a reflow furnace. The device includes a conveyor for transferring a circuit substrate, a heater for heating the transferred circuit substrate, a cooler for cooling the circuit substrate which has been reflow soldered by heater, discharge pipes and a discharge blower for discharging an exhaust gas at high temperature from the heater to the outside of the device, and a flux remover mounted in the discharge pipes which cools the exhaust gas to 70.degree. C. and below, preferably 60.degree. C. and below, so as to cause a vaporized component, such as flux contained in the exhaust gas, to become liquid or solid and to be removed.