Boiler used for treating papermaking waste liquor

Abstract

The invention discloses a boiler used for treating papermaking waste liquor. The boiler comprises a boiler body, a drum, convection pipe bundles, a convection pipe bundle lower header I, a convection pipe bundle lower header II, an economizer, an air pre-heater and a supporting assembly. The boiler body is composed of a combustion chamber and a smoke buffering area. The combustion chamber communicates with the smoke buffering area. The multiple convection pipe bundles are arranged in the smoke buffering area side by side. A steam-water separating device is arranged in the drum, the combustion chamber is fixed to the supporting assembly, and the drum is arranged on the top of the combustion chamber. The convection pipe bundle lower header I and the convection pipe bundle lower header II are fixed to the lower portion of the combustion chamber. The convection pipe bundle lower header I communicates with the convection pipe bundle lower header II. The combustion chamber is a square frame defined by a front wall, a rear wall, a left wall and a right wall in a mutual buckling manner. According to the boiler, the papermaking waste liquor can be combusted as much as possible, and accordingly, heat of organic matter in the waste liquor is recycled; and in addition, the temperature of the smoke can be reduced in the smoke discharging process, meanwhile, the flow speed of the smoke can be reduced, and sedimentation and capturing of sodium carbonate in the smoke are convenient.

Description

technical field [0001] The invention relates to a boiler, in particular to a boiler for treating papermaking waste liquid. Background technique [0002] Because the waste liquid produced by papermaking will cause pollution if it is directly discharged into the river, it should be treated. The black liquor contains soda ash and organic matter. To recover the heat of soda ash and organic matter in the waste liquid, the waste liquid must be burned. If the existing boiler is directly used to burn black liquor, there are the following disadvantages: first, the combustion chamber is large, which is not easy to catch fire due to the low calorific value of the waste liquid, and does not match the characteristics of unstable combustion; second, the energy saving and environmental protection are not good, and the exhaust gas temperature High, if it is directly discharged into the atmosphere, it is neither safe nor a waste of energy; third, the flow rate of the flue gas is too high, so...

AI Technical Summary

Problems solved by technology

If the existing boiler is directly used to burn black liquor, there are the following disadvantages: first, the combustion chamber is large, which is not easy to catch fire due to the low calorific value of the waste liquid, and does not match the characteristics of unstable combustion; second, the energy saving and environmental protection are not good, and the exhaust gas temperature High, if it is directly discharged into the atmosphere, it is neither safe nor a waste of energy; third, the flue gas flow rate is too high, soda ash is carried by the flue gas and cannot be settled and collected

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