Cooling method for the exhaust gas from the reduction furnace.

There should be two types of cooling: heat transfer oil cooling and steam cooling

The reduction furnace is cooled by high-temperature water, but how is the exhaust gas cooled? There is a temperature of 1000℃, and it should be cooled — I still don’t know.

By \"high-temperature cooling of the reduction furnace\" as mentioned above, do you mean that the furnace body is protected and cooled using a jacket? The gases coming out of the reduction furnace pass through a cooler similar to a jacketed tube; inside this cooler is the inlet pipe for the reduction furnace, with high-temperature cooling water pipes coiled around it. The outermost layer of pipes constitutes the outlet pipe for the reduction furnace. The exhaust gases heat the incoming air, while at the same time being cooled by the high-temperature cooling water. After that, they leave the reduction system and enter the exhaust gas recovery CDI unit. This CDI unit consists of three heat exchangers: one for cooling with circulating water, another for cooling low-temperature exhaust gases, and yet another for cooling with low-temperature brine. After separation, the gases are further cooled using R507 or R22.

It can be cooled with hot water or lukewarm water, or with a separate cooler as well

Air cooling is primarily achieved through water cooling; it is also used to preheat the mixture entering the reduction furnace, with gas-to-gas heat exchangers being employed for this purpose. The problem is that the exhaust temperature is too high, which can easily damage the gasket and valves; it might be advisable to use water cooling to reduce the temperature at the point where the gas exits the reduction furnace

May I ask if the temperature of the exhaust gas on the fourth floor can reach 1000? I’m very skeptical.

High-temperature water cooling, and also heat exchange with exhaust gas

The exit temperature is around 1000 degrees; it is cooled with hot water, and then sent to the CDI process unit where it undergoes three stages of cooling.

A harmonious society, a harmonious forum! My personal opinion is that if the person on the eighth floor is not working in the polysilicon industry, he or she is at least very familiar with this manufacturing process. In fact, the temperature of the exhaust gas exiting the reduction furnace certainly does not reach 1000 degrees; 1000 degrees refers to the temperature on the surface of the silicon rods. As the exhaust gas leaves the furnace, it is already cooled by water in the base. Different manufacturers may use slightly different methods, but in most cases, an air-to-air heat exchanger is used to preheat the gas mixture before it enters the furnace, thereby saving energy and reducing the thermal load on the exhaust gas heat exchanger as well as lowering the temperature of the gas entering the exhaust gas recovery system.

Rough silane is quenched; I won’t go into details here.

Cooling is generally achieved using chillers~

How can exhaust gases reach 1000°C? Cool with hot water

First, there is heat exchange between the inlet and outlet air, followed by water cooling of the heat exchanger; the specific process depends on individual circumstances

First, there is gas-to-gas heat exchange with the intake air, followed by passage through respective water coolers; generally, there is a main water cooler before entering the CDI, and then the coolant is used in the recovery system for further cryogenic cooling. Each section is subject to temperature control; before entering the CDI, the temperature generally reaches that of the outside atmosphere. Last edited by kuristying-1 on 2009-4-22 at 14:47.]

Is the exhaust really at 1000? I guess it’s around 700-800; usually, circulating water is sufficient

The reduction temperature of the exhaust gas cannot reach 1000 degrees; the exhaust gas is first cooled using a triple-jacket system with inlet air and hot water