How to choose a hydrogen chloride synthesis furnace?

After comprehensive consideration, I think two-in-one and one-in-one furnaces are better. Our company also has a three-in-one furnace. From actual production, we found that the two-in-one furnace operation is more stable and reliable, while the three-in-one operation is not particularly stable in winter.

Synthesis of trichlorosilane. Unload the silicon powder to the rotating disc, transport it to the silicon powder warehouse with gas through the pipeline, then add the silicon powder dryer, pass through the disc feeder and measure, and then add it to the trichlorosilane synthesis furnace. In the trichlorosilane synthesis furnace, the temperature is controlled at 80-310°C, and silicon powder and hydrogen chloride react to generate trichlorosilane and silicon tetrachloride. The generated trichlorosilane and silicon tetrachloride gases pass through a settler, cyclone separator and bag filter to remove dust and high chlorosilane. After being water-cooled, they are pressurized by a diaphragm compressor and then condensed into a liquid using -35°C refrigerant. The non-condensable gas enters the tail gas elution tower through the liquid seal tank, and is discharged after acid and alkali elution to meet the standards. Trichlorosilane separation. The mixture of trichlorosilane and silicon tetrachloride (trichlorosilane content is 80-85%) enters the pressurized tower and is continuously purified and separated by two towers. By controlling a certain reflux ratio, a product with a trichlorosilane content of more than 99% and a by-product with a silicon tetrachloride content of more than 95% is finally obtained. The dusty exhaust gas is mainly nitrogen that transports silicon powder. The silicon powder is first recovered through bag dust removal, and then washed with water. The washing wastewater is recycled after precipitation, and the tail gas is discharged into the atmosphere after being washed. The dust removal rate of the bag dust collector is 99%, the washing dust removal rate is calculated as 50%, the total dust removal efficiency reaches 99.5%, and the discharge reaches the standard after treatment. Non-condensable gas mainly contains protective gas, and the rest also contains a small amount of chlorosilane, hydrogen chloride, etc. After low-temperature condensation, the remaining non-condensable gas is sent to the exhaust gas treatment device. The chlorosilane series quickly decomposes into silicic acid and hydrogen chloride when exposed to water. The hydrogen chloride gas is first absorbed by the dilute hydrochloric acid cycle and recycled into concentrated hydrochloric acid. The trace part is absorbed and reacted by the alkali liquid. The main component of waste gas is nitrogen. After being washed and treated, the waste gas is discharged through the workshop exhaust pipe to meet the standards. Under the premise of meeting the requirements, try to choose equipment with low speed and low noise. ； At the same time, set up an independent soundproof room for the blower, separated from the floor where it is located, to reduce the noise caused by vibration. ； Install silencers on the air inlet pipes of air compressors, blowers, pumps, etc., and set up soundproof operating rooms to reduce indoor noise pollution and improve the working environment for workers. The chimney is set to a sufficient height to ensure that the flue gas emissions comply with * * The requirements of the secondary standards of the "Comprehensive Emission Standards for Air Pollutants".

Agree with the above point of view. An equipment manufacturer I contacted was the same as you said.

The advantages of the three-in-one furnace are compactness, material saving, small footprint, low investment, easy management, but not easy to maintain.； At present, the two-in-one stove is more commonly used, and there are also four-in-one stoves. As for the operation, it depends on the level of the production unit.

The operation of the two-in-one furnace is relatively stable. Our company has been using it without any major problems!

I think the 2-in-1 synthesis furnace is better. Most of the people who order synthesis furnaces from my company are 2-in-1 synthesis furnaces, and the user opinions are good. b13962096400@126.com :victory:

I also think that a two-in-one furnace is better, and the product of the two-in-one furnace can be used to make acid and can be used for synthesis, so it is more flexible to use.