Up-and-down shunting type oil-enriched coal oil extraction and synthesis gas co-production integrated device and method

Abstract

The invention discloses an up-and-down shunting type oil-enriched coal oil extraction and synthesis gas co-production integrated device and method. The integrated device comprises an active coke conversion furnace, an oil-enriched coal thermal cracking reaction furnace, a gas-solid shunt, a cooling buffer hopper, a lock hopper, a feeder and a fine slag cooling buffer; direct coupling of pulverizedcoal oil extraction and semicoke efficient conversion is achieved, the tar yield can reach 20% or above to the maximum, and high-quality hydrogen-rich synthesis gas is prepared through active coke efficient conversion in the same system. The technical defects that a conventional low-rank coal pyrolysis and dry distillation process is low in coal resource utilization efficiency, low in comprehensive additional value, low in tar yield, poor in generated synthesis gas quality, serious in technological process pollution and the like are overcome. The operation conditions are mild. And continuous,safe and stable operation can be realized.

Description

technical field [0001] The invention belongs to the field of coal chemical industry, relates to clean and efficient conversion of low-rank coal, and cascaded utilization technology, and specifically relates to an integrated device and method for oil-rich coal extraction and co-production of synthetic gas with upper and lower split flow. Background technique [0002] The "Golden Energy Triangle" region where Shaanxi, Ningxia, and Inner Mongolia Autonomous Region are located in the western region of China and the "oil-rich coal" region in the Xinjiang Autonomous Region are very rich in "oil-rich coal" resources. More than 50% of total reserves and annual output. The "oil-rich coal" resource with high volatile content and high chemical reactivity is a precious oil resource in itself, which is of great significance for ensuring the security of my country's energy strategy. CN205133505 discloses a low-rank coal classification utilization polygeneration system, including a raw co...

AI Technical Summary

Problems solved by technology

CN205133505 discloses a low-rank coal classification utilization polygeneration system, including a raw coal pyrolysis carbonization system and an entrained bed dry powder gasification system, and the pyrolysis carbonization system performs pyrolysis carbonization on high-water / high-ash low-rank coal Processing, to obtain raw coal gas, tar and semi-coke, raw coal gas is purified to obtain coal gas, semi-coke is sent to entrained bed gasification, and the low-rank coal pyrolysis and carbonization equipment controls the operating temperature to 300-550 ° C, using self-heating or external heating The temperature in the furnace is controlled by operation, but the technology disclosed in this invention has the following technical defects: 1) The air-dried raw coal used in the disclosed pyrolysis and carbonization reactor has a volatile content of 48.14% on a dry basis of most of the raw coal types, But the tar yield is only 5%, and the tar yield is very low. Limited by the process technology, a large amount of coal tar is condensed into semi-coke or cracked into raw gas components; After blending, it needs to be re-milled, and then enter the entrained bed gasifier with pulverized coal for gasification to produce synthesis gas; 3) The coupling degree between the raw coal pyrolysis and dry distillation system and the entrained bed dry powder gasification system is very low , there is no efficient heat and material internal circulation between the two; 4) The process flow is complex, the degree of intensification among various devices is low, the energy consumption of the process system is high, the energy efficiency level is low, and the technical and economic competitiveness is not strong;

Although the method adopts the decoupling of pyrolysis, gasification and combustion, and uses high-temperature circulating ash as a solid heat carrier, the coal is used in cascade utilization of pyrolysis, gasification and combustion, and the joint of tar, pyrolysis gas and synthesis gas is realized. However, the existing problems are mainly: part of the pyrolysis semi-coke is gasified, and the remaining semi-coke that has not been completely gasified is sent to the combustion furnace for oxygen-enriched combustion. Compared with the complete gasification of semi-coke, it is more expensive Oxygen consumption is high and large amounts of CO are produced 2 , from the perspective of carbon balance, the CO content of the whole process will be reduced, so the amount of effective synthesis gas in the whole process will be reduced, that is, the specific oxygen consumption of the process is high and the synthesis gas yield is low; in addition, from the analysis of the whole process, The semi-coke that has not been completely gasified is burned in the circulating fluidized bed combustion furnace, and the high-temperature circulating ash particles after combustion are relatively fine, so there will be more fly ash in the syngas generated after entering the fluidized bed gasification furnace, which will cause Increase the difficulty of subsequent dust removal of syngas

Images