Boiler system adopting burning low-heating-value fuel gas and operation method for boiler system

Abstract

The invention belongs to the technical field of combustion and boilers, relates to a boiler system adopting burning low-heating-value fuel gas and an operation method for the boiler system, and the low-heating-value fuel gas with a heating value of 600Kcal / m<3>-1000Kcal / m<3> is adopted as a fuel. The boiler system is characterized in that a heat-insulation combustion chamber is arranged, wherein a boiler heating surface is arranged at the periphery of the heat-insulation combustion chamber; heat dissipation of the heat-insulation combustion chamber is reduced by adopting refractory castable, so that conditions such as space, temperature and retention time are provided for stable and complete combustion of the low-heating-value fuel; a ring-shaped seam between a combustion chamber housing and the refractory castable is a combustion-supporting air channel; a little heat dispersed by the refractory castable is absorbed by combustion-supporting air, so that temperature of the combustion-supporting air is increased, and heat dissipation loss is reduced; area of a heat exchange surface is set according to a combustion product of the low-heating-value fuel gas, a radiant heat exchange surface is reduced by 40%-40% in comparison with that of a common boiler, and convection heat exchange surface is increased by 10%-30% in comparison with that of the common boiler. The boiler system effectively solves the emission-reduction and utilization problem of the low-heating-value process tail gas, and has the advantages of high heat recycling efficiency, low operation cost and the like.

Description

technical field [0001] The invention belongs to the field of combustion technology and the field of boiler technology, and relates to a boiler system and its operation method for burning low calorific value gas, with a calorific value of 600Kcal / m 3 ~1000Kcal / m 3 The low calorific value gas is used as fuel, and the low calorific value gas is guaranteed to be stably and completely combusted by setting a partition wall heat exchanger and an adiabatic combustion chamber, so that the boiler can generate hot water or steam. This technology is applicable to boilers that use various low calorific value gases such as blast furnace gas, refinery tail gas, oil shale refinery tail gas, and activated carbon tail gas as fuel. Background technique [0002] Petrochemical, metallurgical, pharmaceutical and other industries produce a large amount of low calorific value process tail gas in production, such as blast furnace gas, refinery tail gas, oil shale refining tail gas, activated carbon...

AI Technical Summary

Problems solved by technology

The low calorific value of these process tail gases is usually 600Kcal / m 3 ~1000Kcal / m 3 , it is difficult to burn continuously and stably under natural conditions, so there is a certain risk in utilization

If it is discharged directly, it will not only waste energy but also pollute the environment

The current utilization methods include mixing other fuels to increase the calorific value or high-calorific-value gas with burning; Increased costs, reduced economic benefits

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