Combustion quality analysis and control system for industrial kiln

Abstract

The invention discloses a burning quality analysis and control system used for industrial stoves such as heating furnace, hot blast stove, boiler. Sampling pipe disposed at tail of the stove or in flue transfers sampled flue gas to purifying sampling chamber after the flue gas has been cooled, and oxygen sensor detects oxygen content value of the flue gas. As the oxygen content value of the flue gas in stove exceeds the predetermined value, i.e. excessive air distribution, the oxygen transmits the signal to a controller for comparing, operating or processing, and then transmits the processed signal to speed governor to reduce the rotation speed of blower group, i.e. air reduction, until air amount is appropriate; contrarily, if the oxygen content value of the flue gas in stove, detected by the oxygen sensor, is lower than the predetermined value, i.e. lacking air distribution, the speed governor will increase the rotation speed of the blower group, i.e. air increase, until air amount is appropriate, thereby, keeping the air consumption system of the stove in region of 1.0 to 1.1. The analysis and control system can not only improve burning quality of the industrial stove thereby providing economic benefit for user, but can also greatly reduce the emission of nitrogen oxides or carbon monoxide, therefore, has great popularization value.

Description

technical field [0001] The invention relates to a combustion control system for industrial furnaces, in particular to a combustion quality analysis and control system that can ensure the combustion quality of gas or liquid or solid fuels used in industrial furnaces such as heating furnaces, hot blast furnaces, and boilers. . Background technique [0002] Ensuring the combustion quality of industrial furnaces has always been a topic of concern and research around the world. When burning gas, liquid or solid fuels, industrial furnaces not only have poor combustion quality, but also seriously pollute the environment. Due to the extensive economic development in our country, there was insufficient understanding of the combustion quality of industrial furnaces in the past, and the research on its measurement and control technology was relatively backward. For example, the existing furnace temperature control, pulse combustion control, etc. all control the combustion quantity. Th...

AI Technical Summary

Problems solved by technology

The air volume control method is an open-loop automatic or manual control method, that is, the air volume is controlled according to the change of the fuel volume in order to achieve the purpose of completely burning or basically completely burning the industrial furnace. This air distribution method is very inconvenient. Reasonable, such as excessive air distribution (that is, the actual air volume is much greater than the theoretical demand) or insufficient air distribution (that is, the actual air volume is far less than the theoretical demand) and other problems

Excessive air distribution will cause the motor to consume more electric energy. Excessive air distribution will also cause the furnace temperature to drop and the amount of exhaust gas to increase, and the heat loss taken away by the flue gas will increase. Channeling increases the heat loss to the escape gas outside the furnace. Excessive air distribution will increase the oxidation and burning loss of metal objects in the furnace. Insufficient air distribution will lead to incomplete combustion of fuel, which not only causes energy waste, but also pollutes the environment, and at the same time reduces the combustion temperature

In short, before the present invention, the combustion control of industrial furnaces did not carry out the detection and analysis of combustion products, and did not analyze and automatically track and control the air consumption coefficient, which would lead to poor combustion quality

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