Fuel gas output system with stable heat value

Abstract

The invention relates to the technical field of fuel gas application, in particular to a fuel gas output system with a stable heat value. The fuel gas output system with the stable heat value comprises a fuel gas I regulating valve, a fuel gas I flowmeter, a fuel gas II regulating valve, a fuel gas II flowmeter, a heat value instrument and a PLC, the fuel gas I regulating valve and the fuel gas Iflowmeter are arranged on a fuel gas I pipeline, the fuel gas II regulating valve and the fuel gas II flowmeter are arranged on a fuel gas II pipeline, the heat value of the fuel gas I is higher thanthe heat value of the fuel gas II, the heat value instrument is arranged on a mixed gas pipe, the PLC calculates the flow ratio K of the fuel gas I to the fuel gas II in the mixed gas according to a measured value, and then the flow of the fuel gas I is regulated and controlled after K is compared with a set value until the heat value of the mixed gas is consistent with the set heat value. Compared with the prior art, the fuel gas output system with the stable heat value has the advantages that liquefied gas-air mixture can be completely used as substitute energy to replace natural gas for areas with insufficient natural gas supply or areas without natural gas supply, the situation of insufficient natural gas supply can be effectively relieved, and the fuel gas output system has great significance in reducing the production cost of industrial enterprises.

Description

technical field [0001] The invention relates to the technical field of gas application, in particular to a gas output system with stable calorific value. Background technique [0002] In modern industrial furnaces (such as metallurgical heating furnaces, glass industry heating furnaces, and ceramic industry heating furnaces), gas is mostly used as heating fuel. A furnace may use many burners, and each burner outlet has a gas nozzle. Generally, a gas nozzle of a structural type needs to correspond to a gas with a fixed calorific value in order to obtain an optimal combustion ratio, achieve the purpose of controlling the combustion efficiency and improving the heating quality of the product. [0003] So far, my country's natural gas is far from enough for residents' daily use. During the dinner gas consumption peak in winter, during festivals, etc., the natural gas supply is far from sufficient, especially in border areas far away from cities and villages with hundreds or tho...

AI Technical Summary

Problems solved by technology

When the coke oven gas fluctuates greatly, it may cause fluctuations in the actual air excess coefficient of the combustion of the blast furnace gas and coke oven gas mixture in the furnace, resulting in an unreasonable air-fuel ratio

When the air-fuel ratio is small, the furnace temperature is low. When the air-fuel ratio is large, it will cause the flue gas to take away heat, waste energy, and increase the cost. Over-combustion and under-combustion will affect the combustion quality

Due to the diversity of gas types and the instability of gas calorific value, there is currently no satisfactory solution to achieve stable calorific value output of various gases

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