High back pressure igniting method of gasification furnace

Abstract

The invention discloses a high back pressure igniting method and structure of a gasification furnace. The igniting back pressure is in a range from 1.0MPa to 3.0MPa, the fuel gas flow is in a range from 30Nm3 / h to 150Nm3 / h, the oxygen flow is in a range from 45Nm3 / h to 160Nm3 / h, the ratio between the fuel gas flow and the oxygen flow is 1: (1-1.5), and a high energy igniter with more than 15J power is used for igniting. According to the high back pressure igniting method and structure of the gasification furnace, high system back pressure is used as a precondition of igniting, an appropriate igniting environment is provided for the gasification furnace by controlling over the fuel gas flow and the oxygen flow, and final igniting is performed by means of the high energy igniter. The igniting method has the advantages that an extremely high success rate is achieved, the pressure rising time after igniting is greatly shortened, the production efficiency is effectively improved, and the equipment safety can be effectively guaranteed. The method is a first igniting technology which comes into use in relevant fields in China, other gasification technologies have not the advantages of the method, a groundbreaking significance is achieved, and the development of coal gasification technologies is positively influenced.

Description

technical field [0001] The invention relates to the technical field of gasification furnaces, in particular to a high back pressure ignition method for gasification furnaces. Background technique [0002] Before feeding the gasifier, in order to meet the required heat load during feeding, the furnace of the gasifier needs to be heated and baked. In the coal-water slurry gasification technology, because the gasifier is built with refractory bricks, which have the function of heat storage, the gasifier oven is generally suffice under normal pressure. However, the water-cooled wall dry coal pulverized gasification technology cannot meet the feeding requirements through heat storage in the furnace, so the gasification furnace is generally equipped with an ignition burner or a start-up burner, and the system back pressure is gradually increased through the ignition burner to provide feeding required heat load. [0003] In the current dry coal gasification technology, when the i...

AI Technical Summary

Problems solved by technology

Therefore, the current ignition method requires a long time to increase the system back pressure after the ignition is successful. This method increases the loss of oxygen and fuel gas, increases the start-up time of the system, and leads to an increase in production costs.

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