Indirect temperature measuring device in entrained flow gasifying furnace

Abstract

The invention belongs to the field of measurement and control of boilers and discloses an indirect temperature measuring device in an entrained flow gasifying furnace. The indirect temperature measuring device in the entrained flow gasifying furnace comprises a first spray nozzle and a second spray nozzle which are horizontally distributed in a furnace body and have the same structure, wherein the first spray nozzle and the second spray nozzle penetrate through the furnace body; one end, which is positioned inside the inner cavity of the furnace body, of the first spray nozzle is connected with a first water cooling hood; one end, which is positioned inside the inner cavity of the furnace body, of the second spray nozzle is connected with a second water cooling hood; the first water cooling hood and the second water cooling hood are trumpet-shaped and ends with bigger trumpet openings face the center of the furnace body; the horizontal central axial lines of the first water cooling hood and the second water cooling hood are the same line; a water inlet pipe is coiled on the second water cooling hood; a water outlet pipe is coiled on the first water cooling hood; a flow meter and awater inlet temperature meter are arranged on the water inlet pipe; and a water outlet temperature meter is arranged on the water outlet pipe. The indirect temperature measuring device in the entrained flow gasifying furnace has the characteristics of reasonable structure, and capacities of protecting equipment in the furnace and ensuring the temperature measuring precision, and can measure the temperature accurately in real time; and simple and convenient computation is guaranteed.

Description

technical field [0001] The invention belongs to the field of boiler measurement and control, and relates to an indirect temperature measuring device in a boiler, in particular to an indirect temperature measuring device in an entrained flow gasification furnace. Background technique [0002] Entrained bed gasification is an important form of coal gasification. The raw coal is fed into the furnace in powder form. The pulverized coal and gasification agent are sprayed into the gasifier through nozzles or burners, and are fully mixed and Combustion and gasification reactions. The gasification furnace provides a reaction space for the gasification reaction. The reaction temperature of the entrained bed gasification is very high, generally maintained at a high temperature of 1400-2000 ° C, thus ensuring the complete conversion of carbon. Gasification adopts the liquid slag discharge method. The slag is in a liquid state at high temperature and is cooled on the wall of the gasifi...

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Problems solved by technology

This method is only a method of judging the furnace temperature, and there is a delay, and when the coal quality changes, it will affect the measurement and judgment results

The other is the steam flow method. When the inner furnace wall of the gasifier is a water-cooled wall structure, the steam production of the water-cooled wall can be used to judge the furnace temperature. This method can be used to judge the furnace temperature, but because the measured steam production is the The steam production of all heating surfaces of the gasifier, and the heat load per unit area of ​​each heating surface of the gasifier is very different, so the application of this method cannot accurately calculate the local temperature of the furnace reaction zone, but can only be used for qualitative Judgment of changes in furnace temperature

At the same time, due to the slag layer attached to the water wall, the existence of the slag layer will make the process of calculating the gasification temperature by using the radiation heat absorption become more complicated.

In short, the current indirect measurement calculation method is not an ideal indirect temperature measurement method due to its complex measurement and calculation process, large measurement error, many interference factors, and large time constant of measurement results.

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