Process gas temperature control in the Klaus reactor?

The temperature for the second reaction should not be set at 280°C – that’s too high; it should normally be around 230°C to 250°C. For the second stage of the reaction, the appropriate temperature is around 220°C. Because the Claus reaction that takes place in the reactor is an exothermic reaction, a decrease in temperature helps to increase the conversion rate. However, the temperature must not be too low; it should be kept at least 30°C above the dew point of sulfur in the process gas. Otherwise, liquid sulfur may form and block the active sites of the catalyst, leading to its deactivation. In the reverse process, the sulfur partial pressure in the gas is high, and accordingly its dew point is also higher; therefore, it is necessary to control the aforementioned temperature.

Process parameters are fixed; one must learn to use them flexibly. The temperature is set at a value that, during normal production, takes into account primarily the dew point of sulfur. The temperature in the first stage is higher than that in the second stage due to the sulfur vapor components and partial pressures in the process gas. High dew point. The operations also depend on factors such as the system’s load level.

Another reason for the high temperature during rotation is that high temperatures facilitate the hydrolysis reaction of organic sulfur.

The converter inlet temperature control is adjusted based on the bed temperature, which in turn is determined by the catalyst’s activity, the concentrations and equilibrium of hydrogen sulfide and sulfur dioxide, as well as the inlet temperature. Within one rotation, there are mainly two types of reactions; one of them is the hydrolysis reaction of organic sulfur, which is an endothermic reaction. Therefore, a higher bed temperature is required; a higher partial pressure of sulfur vapor is generated in the next rotation, and a higher temperature is needed to prevent the formation of liquid sulfur. The concentrations of hydrogen sulfide and sulfur dioxide at the second stage are relatively low, resulting in a low partial pressure of sulfur vapor; therefore, a lower temperature is required, with around 247 degrees being an appropriate value.

Regarding temperature control, the cause should be sought in the process; 1. A high temperature at the first rotation – controlling it at 280 degrees at the inlet – is unreasonable. The temperature of the bed layer should be controlled. The high-pressure parameter value should be kept around 330 degrees, while for the reheat mode, 320 degrees is sufficient. 2. The temperature for the second conversion stage is relatively low, mainly to increase the overall conversion rate of the device. 3. The dew point is a matter of considerable concern; the dew point at the second stage is around 186 degrees, and it’s no problem to keep the bed temperature at 200 degrees

In a certain section, the temperature is high; the main reasons for this are as follows: 1. The concentrations of H2S and SO2 in this section of the reactor are higher than those in the subsequent sections, resulting in more heat release. 2. Controlling a high temperature can hydrolyze most of the organic sulfur, as higher temperatures facilitate the hydrolysis of organic sulfur (an endothermic reaction). 3. Temperature difference between the front and rear sections – this is also a parameter specifically set in the process; reducing the temperature in the rear section facilitates the H2S/SO2 reaction (an exothermic reaction)

When determining the temperature of the converter, the following factors should be taken into consideration: 1. The reaction between hydrogen sulfide and sulfur dioxide to produce elemental sulfur is a reversible exothermic reaction; the design conditions should aim to favor the reaction equilibrium in such a way that elemental sulfur is produced. For example, separating elemental sulfur and reducing the reaction temperature are both considerations for this purpose. 2. It helps to accelerate the reaction speed. For example, increasing the reaction temperature or installing a catalyst bed. 3. It helps to achieve the highest conversion rate, such as by increasing the hydrolysis rate of organic sulfur (at temperatures above 300 degrees). 4. Maintain catalyst activity. For example, to prevent elemental sulfur from depositing on the active centers of the catalyst. By conducting a comprehensive analysis of these aspects, one can understand why there is a large temperature difference between the first and second stages.

Generally, one rotation is 240 degrees, which facilitates the hydrolysis of organic sulfur compounds such as COS