49results about How to "Reduce coke rate" patented technology

The invention discloses a method for producing needle coke by adopting the technique combining delay coking and kettle-type coking. The method comprises: when treating the conventional coking raw material by using the delay coking technique, introducing FCC slurry oil into a delay coking tower from the upper part inside the tower at the low temperature, and obtaining needle coke raw material by fractionating high temperature oil gas obtained by the reaction; and then, treating the needle coke raw material by using the kettle-type coking technique, and obtaining high quality needle coke. In the method, as the FCC slurry oil is injected into the coking tower at the lower temperature, the decomposition temperature of the conventional coking raw material is lowered, the high temperature decomposition time of the raw material is shortened, the occurrence of secondary reaction is reduced, green coke rate is reduced, the stable operation cycle of a signal tower is prolonged, and light components which have high reaction activity and are not beneficial to producing the needle coke, heavy components with high polymerization activity, and a great deal of impurities such as catalyst powder, heavy metal and the like can be removed. The obtained needle coke has high yield and good quality.

The invention provides a preparation method of a hydrogenation catalyst for a slurry bed of heavy oil as well as the catalyst and an application thereof. The preparation method comprises the following steps: a molybdenum-containing compound and at least one soluble salt of a metal element which is selected from nickel, cobalt, iron, manganese and copper are dissolved in an aqueous solution; organic acid is added in order to generate sol; a sulfuration reaction is directly carried out in order to obtain ultrafine solid powder in sulfurized state; emulsification and dispersion of the obtained ultrafine solid powder in sulfurized state and distillate oil are carried out, in order to obtain the hydrogenation catalyst for a slurry bed of heavy oil. The hydrogenation catalyst for the slurry bed of heavy oil is applied to a hydrogenation process of a heavy oil raw material of the slurry bed or a suspended bed, the catalyst has good dispersion performance and hydrocracking performance in heavy oil, and coking formation rate can be effectively reduced.

The invention discloses a method for producing a needle coke raw material by using a delayed coking process. In the method, full-range coal tar is imported to the top and the middle and a high-temperature conventional coking raw material is imported to the bottom; the high-temperature oil gas generated by the conventional coking raw material via high-temperature cracking is mixed with the full-range coal tar with lower temperature at the top and the middle of a reactor so that the full-range coal tar can crack hydrocarbon molecules with high reaction activity at a proper high temperature to achieve the aim of desorption; for the full-range coal tar, under the condition of the delayed coking process, asphaltene and partial colloid are condensed to form coke which is deposited in a coking tower so as to remove the components going against the production of the needle coke; furthermore, by means of the injection of the low-temperature full-range coal tar, the cracking temperature of the conventional coking raw material is reduced, the high-temperature cracking time of the conventional raw material is shortened, the secondary reaction is decreased, the coke generation rate is reduced and the stable operation period of a single tower is prolonged.

The invention provides a method for controlling the upper-middle temperature of a catalytic cracking raising pipe, comprising the following steps of: atomizing a medium which is easy to vaporize, such as an oil-water mixture, by using an incondensable dry gas, and injecting into a reactor by selecting a nozzle with an atomization function; and fast vaporizing on the downstream position of a spray nozzle positioned on the upper-middle appropriate position of the catalytic cracking raising pipe, wherein a temperature reducing amplitude can maximally reach 20 DEG C. The invention can also eliminate water attack vibration noises generated when vapors contact with the medium and reduce the yield of the incondensable dry gas about 0.3 percent and the coke yield about 0.2 percent.

The invention discloses a hydrocracking catalyst for a vacuum residue suspension bed and a preparation method and a use method thereof. The hydrocracking catalyst for the vacuum residue suspension bed is prepared by the following step of: selecting iron pyrite of which the mass percentage content of iron is 40-50 percent for serving as a raw material. The hydrocracking catalyst for the vacuum residue suspension bed is prepared from a cheap iron pyrite raw material, and has the advantages of wide raw material source and simple treatment and preparation processes; the coke yield is low and the fraction yield is high under a low pressure condition; generated coke can suspend in liquefaction oil without being attached to the inner wall of a high-pressure electromagnetic stirring reaction kettle, so that blockage of a reactor and a pipeline in an industrial device is prevented; hydrogenation lightening is performed on vacuum residues through a two-section reaction, the temperature is controlled stably, the phenomenon of violent temperature rise in a hydrogenation lightening process of vacuum residues is avoided, and the coke yield is further suppressed; and a foundation is laid for the industrialization of a vacuum residue suspension bed hydrocracking technology.

The invention discloses a suspended bed hydrocracking catalyst for coal tar and a preparation method thereof. The preparation method comprises the following specific steps: adding a ferrous sulfate solution into semi-coke powder suspension, conducting stirring, adjusting a pH value through ammonia water, and then introducing air for an oxidation reaction so as to obtain a semi-coke powder suspension b loaded with an iron compound; then adding regenerated powder of a waste cobalt-molybdenum-nickel series hydrocracking catalyst into the suspension b, successively carrying out stirring, filteringand drying to obtain solid powder containing semi-coke, the iron compound and the regenerated powder of the waste cobalt-molybdenum-nickel series hydrocracking catalyst; and finally, uniformly mixingthe solid powder with red mud powder to obtain the suspended bed hydrocracking catalyst for coal tar. The catalyst prepared by using the method provided by the invention can effectively improve the conversion rate of heavy oil in coal tar and increase the yield of light oil, and is low in coking rate and relatively low in catalyst cost, so the economic benefit of a device can be obviously improved.

The invention provides an upper furnace door of a clean heat recovery coke oven. The upper furnace door comprises a furnace door body (1) and three detachable zigzag-form cast iron lower edges (2), wherein an arc segment is arranged on the body (1) and is provided with a semicircular groove (3), an asbestine circular rope is arranged in the semicircular groove (3), and the detachable zigzag-form cast iron lower edges (2) are connected with the furnace door body (1) through heatproof bolts. According to the invention, through improvement of the structure of the furnace door and the material of a fireproof casting layer, the sealing mode of the furnace door is changed into flexible sealing, so the problems of poor sealing, severe leakage, unorganized air supply for the coke oven and great amount of heat dissipation of current rigid surface contact are overcome, the rate of non-fully coked char is reduced, waste heat utilization and total char yield are improved, and less resources are wasted; meanwhile, frequency of replacing of the whole upper furnace door due to burnt lower edges of the upper furnace door is reduced, and it only needs to replace a burnt lower edge with the detachable zigzag-form cast iron lower edge, so economic benefits and social benefits of an enterprise can be improved.

The invention discloses a hydrogenation catalyst, a preparation method and an application method thereof. It uses organic phosphonic acid and molybdenum source as reaction raw materials, utilizes the reaction of the two, and bonds the two together to prepare a hydrogenation catalyst. Among them, the inventors found for the first time that P in the organic phosphonic acid can change the surface acidity of the active phase, increase the surface acidity of the hydrogenation catalyst after sulfidation, and the increase in acidity helps to enhance the hydrogenation activity of the hydrogenation catalyst; in addition, the presence of P has It helps stabilize asphaltenes, thereby inhibiting asphaltene condensation and coking, thereby reducing the amount of coke, slowing down catalyst deactivation, and finally reducing the coking rate and increasing the hydrogenation yield. At the same time, it is also found that the presence of P helps to change the structure of the active phase in the hydrogenation catalyst, which can reduce the amount of molybdenum with a tetrahedral structure that is difficult to vulcanize, and increase the amount of molybdenum with an octahedral structure that is easy to sulfide, which in turn facilitates the sulfuration of molybdenum. In the process, it is converted into molybdenum disulfide with suitable stacking layers, thereby increasing the activity of the hydrogenation catalyst and increasing the hydrogenation yield.