Circulating fluidized bed gasifier system and starting method thereof

Abstract

The invention relates to a circulating fluidized bed gasifier system and a starting method thereof, and solves the problems of great nitrogen consumption, high equipment investment and high operation cost during starting of a circulating fluidized bed gasifier system. The system comprises a gasifier, a waste heat boiler, a filter, and a washing tower, which are orderly connected through pipelines; the washing tower is provided with a gas inlet connected with the filter, and a gas outlet respectively connected with a torch and a downstream device; the system is characterized in that the system also comprises a venturi drawing device; the venturi drawing device is provided with a high-pressure nitrogen inlet, a circulating gas inlet and a gas outlet; the circulating gas inlet is connected with the gas outlet of the washing tower; the gas outlet of the venturi drawing device is connected with the gasifier. The starting method of the invention adopts high-pressure nitrogen as power gas; injection is performed inside the venturi drawing device to form partial vacuum; the fluidized gas discharged to the torch from the drawing part is used as circulating fluidized gas. The invention is simple in process, can greatly reduce nitrogen consumption, and can effectively reduce equipment investment and operation cost.

Description

technical field [0001] The invention relates to a circulating fluidized bed gasifier system and a start-up method thereof. Background technique [0002] When the circulating fluidized bed gasifier is initially started up, a large amount of low-pressure nitrogen is first required to establish a circulating fluidized state in the gasifier, and then the gasifier is gradually heated to about 650°C by the high-temperature flue gas generated by burning diesel in the heating furnace , and then spray diesel oil into the gasifier through a diesel spray gun, and continue to heat up to about 950°C through the combustion of diesel oil in the gasifier, and then start to put coal powder into the gasifier, and the gasifier gradually turns into normal operation. Since the circulating fluidized bed gasifier is made of refractory lining material, the heating rate of the refractory lining is usually required to be no more than 50°C / h, so the circulating fluidized bed gasifier takes a long time...

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Problems solved by technology

[0004] In order to solve the above problems, a project proposes to purchase liquid nitrogen storage, and then use it after pressurization and gasification by a liquid nitrogen pump. It is necessary to increase equipment such as liquid nitrogen storage tanks, liquid nitrogen pumps, and vaporizers. It is estimated that an additional equipment investment of 500 is required. It takes about 500,000 yuan to purchase liquid nitrogen every time you drive.

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