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Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology.

Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology.

(Summary description)Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology.

Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology.

(Summary description)Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology.

Information

Nuclear graphite production Nuclear graphite production is basically carried out on the basis of ordinary artificial graphite production technology. In view of the high purity, high density, and low anisotropy of nuclear graphite, the current graphite production technology, raw materials and equipment are improved to meet the requirements for producing nuclear graphite.

There are 4 main problems in nuclear graphite production, namely high purity, high density, anisotropy and mechanical processing.

(1) High purity. The purity of nuclear graphite moderator is one of the most valued characteristics. Firstly, petroleum coke and coal tar pitch with high purity and low impurity content are selected as raw materials. The content of boron in the raw material impurities should be low, because the boron content of 1×10 is equivalent to increasing the cross section of 1mb, most of the metal impurities in high-temperature graphitization volatilize at 2800~3000℃, and it is difficult to remove boron above 3000℃, because boron and carbon Form B4C3. The requirements for the content of boron in the raw materials are extremely strict. In addition to the raw materials, it is also very important to go through more than 10 processes in the production to reduce foreign impurities and a reasonable process system.

(2) High density. Nuclear graphite should have a higher density, which is generally controlled at about 1.79/cm, which can basically meet the requirements of graphite pile operation. The bulk density of graphite represents the effective moderator's slowing rate, and the decrease in density reduces the number of atoms per unit volume. , The slowdown rate is reduced.

(3) The anisotropy is small. When graphite is used in a nuclear reactor, thermal expansion due to temperature rise and Wigner growth caused by irradiation. This phenomenon is very large in the direction perpendicular to the extrusion direction, but less in the direction parallel to the extrusion direction, and the graphite block cannot expand in the same proportion as the original shape. Therefore, the anisotropic expansion of graphite cannot be ignored in the structure of the moderating layer formed by the accumulation of many graphite blocks. Graphite anisotropy is mainly due to the extremely anisotropic nature of the graphite crystal structure. On the other hand, the arrangement of coke particles during extrusion molding also has a decisive influence on the anisotropy of the product, so measures must be taken to reduce the degree of anisotropy during the molding process.

(4) Mechanical processing. Graphite deceleration layer and reflective layer are piled up by finishing blocks. The graphite masonry has various pores for fuel rods, control rods, instruments and tests. These pores have accurate dimensions. In addition, all graphite block masonry can prevent the leakage of neutron flow and cooling gas. For this reason, nuclear graphite processing requires higher precision than any graphite product processing. In fact, the accuracy is required to be within a few threads. In order to ensure the accuracy of product processing, a dedicated high-precision processing machine is provided.

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