Coal gasification circulating water system

Abstract

The invention discloses a coal gasification circulating water system which comprises a steam pocket, a circulating pump, a gasification furnace, a nozzle water cooling pipe, an upper water cooling pipe and a lower water cooling pipe, wherein a water outlet, a water return opening and a steam outlet are formed in the steam pocket; the circulating pump is connected with the water outlet; a nozzle is arranged on the gasification furnace; the head of the nozzle extends into the gasification furnace; the nozzle water cooling pipe encircles the head of the nozzle; the inlet end of the nozzle water cooling pipe is communicated with the circulating pump; the outlet end of the nozzle water cooling pipe is communicated with the water return opening; the upper water cooling pipe is arranged at the upper part of a furnace cavity; the inlet end of the upper water cooling pipe is communicated with the circulating pump; the outlet end of the upper water cooling pipe is communicated with the water return opening; the lower water cooling pipe is arranged at the lower part of the furnace cavity; the inlet end of the lower water cooling pipe is communicated with the circulating pump; the outlet end of the lower water cooling pipe is communicated with the water return opening. According to the coal gasification circulating water system, the dew point corrosion to the nozzle water cooling pipe is improved, heat stress on the nozzle and the water cooling pipes is reduced, and the service life of the nozzle is prolonged.

Description

technical field [0001] The invention relates to the technical field of coal gasification, in particular to a coal gasification circulating water system. Background technique [0002] Coal-water slurry gasifier process nozzle is one of the core equipment for pressurized coal gasification. Due to the high operating temperature of the gasifier, it is usually necessary to cool the nozzle head to ensure its service life. The nozzles in the related art adopt an independent cooling water circulation circuit: the nozzle cooling water from the nozzle cooling water tank passes through the cooling water pump and the cooler and then passes into the water cooling coil at the nozzle head to cool the nozzles, and the heated cooling water enters the soda water The separator separates the steam and water, and finally returns to the cooling water tank. The temperature of the cooling water in the above-mentioned cooling water circulation loop is usually between 30°C and 40°C, so the temperatu...

AI Technical Summary

Problems solved by technology

The temperature of the cooling water in the above-mentioned cooling water circulation loop is usually between 30°C and 40°C, so the temperature of the outer wall of the water-cooling coil is relatively low, and dew point corrosion is prone to occur; The internal thermal stress is large, which affects the service life of the nozzle

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