36results about How to "Reduced risk of coking" patented technology

The invention discloses a coal tar suspended bed hydrocracking method which comprises the steps of pretreating coal tar; mixing the coal tar with a catalyst and a catalyst promoter to form even raw material oil slurry; putting the raw material oil slurry into a suspended bed reactor; enabling a reaction product to enter a hot high-pressure separator, a warm high-pressure separator, a cold high-pressure separator and a cold low-pressure separator; separating the reaction product; circulating separated hydrogen; enabling separated liquid and catalyst to enter an atmospheric vacuum device to distill out a product and a catalyst, wherein the catalyst can be used circularly. The method has the advantages of low back mixing degree of materials in the reactor, wide raw material adaptability and flexibility in operation.

The invention provides a shunt down method of a fixed bed Fischer-Tropsch synthesis process. The shunt down method comprises the following steps: when a device is shunted down after a fixed bed Fischer-Tropsch synthesis reaction is finished, firstly, maintaining the temperature of a catalyst bed layer to be unchanged; leading nitrogen from the inlet of a reactor, and simultaneously, cutting off raw material gas for feeding; maintaining the amount of a circulating gas to be unchanged; after replacing to the required condition, gradually reducing the pressure of a reactor, and then gradually reducing the temperature of the catalyst bed layer; and when the temperature of the bed layer is reduced to less than100 DEG C, gradually completing shunt down. Compared with the prior art, by using themethod in the invention, the side influence to the catalyst bed layer in the shunt down process is reduced while stable shunt down is achieved, thereby proving a good guarantee for subsequent reworking and catalyst unloading.

The invention discloses a low-pollution combustor with a main combustion grade adopting an effervescent atomizer. A single annular cavity structure is adopted. The low-pollution combustor comprises a diffuser, an outer combustor case, an inner combustor case, a flame tube outer wall, a flame tube inner wall and a combustor head. A graded combustion scheme is adopted for the combustor. The combustor head is divided into a precombustion grade and the main combustion grade. A diffusive combustion mode with stable rotational flow is adopted for the precombustion grade, and the precombustion grade serves as a stable combustion source of the combustor. A premixing and pre-evaporation combustion mode is adopted for the main combustion grade, and even combustion is facilitated. A center grading structure is adopted for the low-pollution combustor, and the precombustion grade is simple in structure; the unique effervescent atomizer is adopted for the main combustion grade for fuel oil injection, so that fuel oil has high atomization quality, fuel oil atomization and mixing are facilitated, the distribution evenness of the fuel oil is further improved, and thus pollutant discharging of whole landing and take-off (LTO) circulation of the combustor of an aero-engine is further lowered.

The invention discloses a method and device for removing particles in a biomass pyrolysis liquid ebullating bed reactor. The method comprises the following steps: A) primary cyclone classification to realize the classification of catalyst micropowder and catalyst particles; B) primary filtration Realize the separation of catalyst fine powder and transport oil; C) two-stage cyclone classification realizes the classification of structurally incomplete catalyst and structurally complete catalyst; D) two-stage filtration realizes the separation of structurally incomplete catalyst and transport oil; E) structurally complete catalyst and Fresh catalyst is mixed and added to the reactor for utilization. The invention also provides a particle removal device in the ebullated bed reactor of biomass pyrolysis liquid. The invention can meet the requirements of realizing the classification of particles and realizing the drying reduction of the separated catalyst, effectively avoiding the foaming and collision of the reactor bed caused by the fine powder of the catalyst, and reducing the risk of coking.

The invention relates to an anti-coking oil collecting tank for passing vaporized oil. Each liquid collecting tank is composed of one or more members with a square tank structure; one end of the liquid collecting tank close to the tower wall is overlapped on a support ring, the other end is overlapped on the edge of a liquid collecting channel, the end overlapped on the support ring is higher than the end overlapped on the liquid collecting channel, and thus the liquid collecting tank is inclined to the liquid collecting channel. The liquid collecting tank in the middle part uplifts, the two ends of the middle liquid collecting tank are respectively overlapped on two neighbored liquid collecting channels, and the middle liquid collecting tank is inclined to the second liquid colleting channel. A liquid baffle plate is in a square tank shape or a triangular tank shape and is fixed above a gap between the liquid collecting tanks through a rib plate or a support plate so as to form a gas channel. The liquid collecting channel has a square tank shape structure, the oil collecting tank comprises one or more liquid collecting channels, one end of the liquid collecting channel is overlapped on a withdrawal hopper, and the bottom plate is inclined to the withdrawal hopper. The number of withdrawal hopper is one or two, and the bottom plate of the withdrawal hopper is inclined to the withdrawal opening. The provided oil collecting tank can reduce the stay time of liquid in the oil collecting tank, reduces the flow resistance, prevents the happening of coking, and guarantees the normal operation of towers at a high temperature.