JPS5848600B2 - Cement clinker - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of high temperature desulfurization.

Currently, due to the lack of energy sources, it is being considered to mainly use coal as a fuel.

When using this as a fuel for power generation, it is considered most advantageous to convert it into a low-calorie gas and use a so-called combined power generation system in which a gas turbine and a steam turbine are combined.

When coal is gasified and introduced into a gas turbine, raw gas must be purified, otherwise it will cause trouble to the gas turbine. Therefore, desulfurization is carried out at high temperatures to minimize losses due to heat exchange and to improve the wet desulfurization method. It is desirable to eliminate the volume loss of the gas that is generated in order to increase the overall power generation efficiency.

That is, one of the important technical issues is to gasify coal and simultaneously remove the sulfur content from the produced gas efficiently and economically.

Most of the high-temperature desulfurization currently being developed uses a method in which desulfurization agent particles are circulated between high-pressure reaction towers and desulfurization regeneration is performed in each tower.

Conventionally considered desulfurizing agents include calcium oxide and dolomite, but when these desulfurizing agents are used in a fluidized bed or moving bed, there is a problem that the desulfurizing agents sinter at high temperatures or, conversely, become powder. This problem has arisen.

Sintering of the desulfurization agent causes various problems such as a decrease in pore area, inability to fluidize, and uneven flow.On the other hand, in the case of pulverization, it requires a dust removal device for exhaust gas, addition of desulfurization agent, replenishment, and subsequent processes. The problem is that it requires a different process.

Moreover, it is very difficult to solve these problems.

This invention proposes a means to solve problems regarding the necessity of two types of columns for deflow and regeneration, sintering, etc.

Cement clinker is a raw material for cement, and can be produced by grinding coal, clay, and stone into fine powder, mixing them well and adding a small amount of water to make small lumps, or by wet method, mixing well in a basin. The mixed raw materials are put into a kiln using a dry method using a suspension preheater and fired at about 1,600°C.

When the high-temperature powder agglomerates are quenched in a quenching device and discharged at 50 to 80°C, a clinker with high hardness and a rough surface is obtained.

The clinker is a porous glassy substance with a complex composition consisting of alit, berit, cerit, and the like.

This aqueous solution of clinker is slightly alkaline.

At high temperatures, hydrogen sulfide (H2S) and sulfur dioxide gas (SO2
) has been confirmed to capture and remove sulfur oxides, but the capture reaction process cannot be clarified.

As an example, the following experimental results show its H2S trapping performance.

This characteristic is presumed to be due to the fact that the clinker is porous and has a large surface area, and the chemical reaction of the Ca (calcium) component in the composition.

Figure 1 shows the experimental results for cement clinker 5,9
The results are shown in which a fixed bed was filled with r and deflowed using a reducing gas containing hydrogen sulfide gas (H2S).

This shows that a sufficient desulfurization effect can be obtained at a gas temperature of 900°C.

After this desulfurization effect was applied, the tarinka was taken out, but no sintering phenomenon had occurred.

This cement tarinka particles or fine particles are used to form a fixed bed or a fluidized bed, and when high temperature gas is passed through it, a desulfurization effect is produced, which has a remarkable effect on the purification of raw gas produced by gasifying coal. It is.

By implementing this invention, fixed bed (same as fluidized bed)
A cement clinker layer was provided using a cement clinker layer, and when gas generated from coal was passed through, the high temperature gas at 900°C was desulfurized, and at the same time, the cement clinker layer acted as a filter and had the effect of removing dust.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the results of an experiment in which the desulfurization effect of a cement tarinka fixed layer was confirmed using a simulated gas containing hydrogen sulfide gas.

Claims (1)

[Claims] 1. A high-temperature desulfurization method using cement clinker, characterized in that high-temperature gas is desulfurized using cement clinker particles as a fixed bed or fluidized bed medium.