GSP gasification technology

Thread Content

There are several images for everyone to share. An overview of the GSP gasification technology: The GSPTM gasification technology utilizes dry powder feeding, pure oxygen fluidized bed gasification, liquid slag discharge, and a process for quenching the crude syngas. This process includes coal preparation, gasification, gas dust removal and cooling, as well as black water treatment. The compressed dry coal powder is delivered to the gasifier via a carrier gas (N2 or CO2). Pressurized dry coal powder, oxygen, and a small amount of steam are introduced into the gasifier through a combined nozzle. The gasifier includes a gasification chamber with a water-cooled wall and a quenching chamber. The operating pressure of the gasifier is 25–40 bar (1 bar = 100 kPa). Depending on the composition of the feed and the ash fusion characteristics of the slag, the gasification temperature is operated between 1350°C and 1600°C. The high-temperature gas, along with the liquid slag, exits the gasification chamber and flows downward to enter the quenching chamber, where the hot syngas is cooled by the sprayed quenching water. The liquid slag becomes granular in the water bath at the bottom of the quenching chamber, is periodically discharged from the slag lockhopper into the slag pool, and then transported out via a chain conveyor. The crude syngas exiting the quench chamber is washed through two stages of venturi tubes; after that, the crude syngas containing saturated steam has a dust content of less than 1 mg/Nm3 before being sent out of the processing area. The GSPTM gasification technology exhibits strong adaptability to different types of coal, high gasification efficiency, a short period for equipment manufacturing and installation, low operating costs, and easy start-up, shutdown, operation, and maintenance. It holds great potential for development in fields such as ammonia synthesis, methanol production, IGCC, and hydrogen production. Introduction to the coal preparation system: Metal-free coal that has been pre-crushed to 0–50 mm and measured in quantity is fed into the grinder via conveyors, where it is ground into particles suitable for gasification (≥94% wt at 50 microns). It is simultaneously dried to a moisture content of less than 2% wt. using a heated inert gas stream. The ground, dried coal powder is sent to the coal pressurization and feeding system via compressed gas (N2 or CO2). This system includes a lock hopper and a feeder. After coal is added to the lockhopper, it is pressurized with compressed gas (N2 or CO2), and then sent to the feeder. Dry coal powder is then delivered from the feeder to the combined nozzle of the gasifier using compressed air (N2 or CO2), with the linear velocity of the transported coal powder being 6–8 m/s ； The density of the coal powder is 350-450 Kg/m3 ； The conveying capacity is 1200 Kg/cm2•h. The amount of pulverized coal fed into the furnace can be measured using a feeder equipped with a weight sensor, as well as a flow meter installed on the pipeline for the coal powder entering the furnace. Introduction to the GSP gasification furnace: The structure of this gasification furnace includes water-cooled walls and a quenching chamber made of heat-resistant carbon steel. The water wall consists of cooling coils shielded with silicon carbide. Thanks to the protection provided by the formed slag layer, the surface temperature of the water wall remains below 500°C. The water wall is fixed only at the bottom of the gasification chamber, and is supported by the guide rails installed at the top of the gasification chamber and nozzles; therefore, thermal expansion at the top does not generate thermal stress. The number of cooling coils depends on the size and load of the vaporizer. For safety reasons, the pressure of the water wall coil must be higher than the operating pressure inside the furnace, to prevent leaks or damage to the coil. The gasifier shell is equipped with a water jacket through which cooling water circulates, so the shell temperature remains below 60°C. Additionally, the gasification furnace can be controlled by adjusting the oxygen and coal powder flow rates, or it can also be regulated based on the gas composition analyzed in real time as well as the pressure difference between the gasification chamber and the quenching chamber. The gross syngas (CO+H2) produced by the GSPTM gasifier when gasifying dry coal powder can exceed 90%, whereas that produced by a water-coal slurry gasifier using wet feeding exceeds 80%. Typical gas composition (on a dry basis) at the outlet of two different types of gasifiers – Gas volume (%): H2, CO, CO2, N2+Ar, CH4, H2S; Total: 100.0. GSPTM gasification process: 23.6, 6.8, 9.3, 3.1, 4.0, 0.1, 0.3; Water-coal slurry process: 36.3, 47.9, 12.6, 1.9, 0.1, 1.2; Total: 100.0. Consumption parameters for the GSPTM gasification process: Material name; 1000 Nm3 (CO+H2); Raw coal (ash content: 6.84 wt%, low calorific value: 27,378 kJ/kg); 564 kg; Oxygen (purity: 99.6%); 315 Nm3; Steam (300°C, 4.5 Mpa(g)); 56 kg. Schematic diagram of the gasifier structure; Photo of the 5MW gasifier