Novel external heating type lignite pyrolysis quality increasing system and process

Abstract

The invention relates to an external heating type lignite pyrolysis quality increasing system and process. The feed port of a pyrolysis oven is connected with the discharge port of a drier, and the discharge port of the pyrolysis oven is connected with a semi-coke cooling chamber; the discharge port of the semi-coke cooling chamber is connected with a burner and a finished product area; the tail gas outlet of the pyrolysis oven is sequentially connected with a dust collection device, a tar collection and desulfuration device; the tail gas outlet of a desulfurizer is connected with the semi-coke cooling chamber and a gas holder, and the tail gas port of the semi-coke cooling chamber is connected with the pyrolysis oven through a high-temperature coal gas booster fan; the smoke inlet of a heat exchanger built in the pyrolysis oven is connected with the smoke outlet of the burner, and the smoke outlet of the heat exchanger is connected with a waste pan; the steam outlet of the waste pan is connected with the steam inlet of the drier; the water inlet of the waste pan is connected with the condensate water outlet of the drier; the tail gas outlet of the drier is connected with the steam inlet of the drier and waste heat recovery device through the dust collection device. According to the system and the process provided by the invention, a superheated steam drying process and an external heating type fluid bed pyrolysis method are utilized to increase the quality, and the thermal efficiency, the tar yield and the calorific value of gas are improved; the sulfur content of semi-coke and waste water treatment amount are reduced; the comprehensive utilization level of resources is high; and large-scale production can be realized.

Description

technical field [0001] The invention discloses a novel external heating type lignite pyrolysis upgrading system and process, which are used for lignite upgrading. Background technique [0002] When coal prices are rising sharply, pyrolysis and upgrading of relatively cheap lignite resources can not only obtain semi-coke with high calorific value and stable properties, solve the transportation problems caused by lignite high water and high ash, but also can produce by-products High-quality tar and gas can solve the shortage of oil and gas resources in our country, improve the utilization efficiency of lignite, and maximize the benefit, which is completely in line with my country's strategy of developing clean coal technology and energy diversification. [0003] According to different heat supply methods, lignite pyrolysis process is divided into two types: external heat type and internal heat type. Representative processes of the external heating type are the Wood furnace lig...

AI Technical Summary

Problems solved by technology

These processes can obtain a stable high-temperature heat carrier source without special heat carrier heating equipment. The pyrolysis semi-coke is directly used for the combustion of the circulating fluidized bed, making full use of the sensible heat of the semi-coke, and the heat utilization rate of the whole system is high. ; The pyrolysis semi-coke diluted by the heat carrier does not need to be separated and directly returned to the boiler for combustion, thereby overcoming the problem of low utilization value of solid products in the traditional solid heat carrier pyrolysis process; Nitrogen compounds are enriched and removed during the pyrolysis process, which significantly reduces the desulfurization and denitrification load of the circulating fluidized bed, but there are still many problems in industrialization. The main reason is that some technical problems are generally encountered in the process development, such as solid material mixing. , the purification of dusty pyrolysis gas and the return of semi-coke (or ceramic balls) and ash after pyrolysis, etc., which hinder the further development of this process

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