Steady-pressure energy-saving backwashing method for heating surface of three-waste furnace

Abstract

The invention relates to a three-waste furnace heating surface pressure-stabilizing and energy-saving backwashing method which comprises the following steps: a, feeding washing water to a water tank of a deaerator to a high water level, controlling the water temperature to be 90-100 DEG C, and enabling the washing water to be ammoniated desalted water with the pH value of 8.8-9.3; b, entering the three-waste furnace from a backwash valve of the superheater, controlling the flow rate, closing a water feeding pump after a steam pocket is full of water, and standing bubbles for 1-1.5 hours; c, opening a fixed discharging valve, starting a water feeding pump to feed water for flushing, discharging water after flushing to a circulating water pool for recycling, and supplementing water to a water tank of the deaerator for heating; d, repeating the steps b and c until the conductivity and the sodium content of the water discharged by the fixed discharge valve are the same as those of the flushing water; and stopping the water feeding pump and the pressure pump, and closing the backwashing valve and the fixed discharge valve to finish backwashing. All heating surfaces of the three-waste furnace are flushed at one time and are not corroded, so that the heat exchange efficiency of the heating surfaces is improved; the start-stop frequency of the pump is reduced, stable-pressure operation is achieved, the steam consumption and the flushing water amount are reduced, and the flushing efficiency is improved.

Description

technical field [0001] The invention belongs to the field of boiler heating surface cleaning, and in particular relates to a pressure-stabilizing and energy-saving backwashing method for heating surfaces of three-waste boilers. Background technique [0002] The three waste furnaces use coal, waste gas and waste residue as fuel to continuously heat the desalinated water into steam through circulation. Although the quality of the desalted water has been greatly improved, the long-term cycle accumulation will still lead to the accumulation of salt on the heating surfaces of the three waste furnaces, especially After the heating surface is replaced and overhauled, there may be rust, welding slag, oil pollution and other debris inside. The accumulation of salt and debris will cause local over-temperature and poor water circulation, which seriously threatens the operation safety of the three waste furnaces. In a high temperature environment, it is not easy to dissolve. [0003] T...

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Problems solved by technology

[0002] The third-waste furnace uses coal, waste gas, and waste residue as fuel to heat desalted water into steam through continuous circulation. Although the quality of desalination has been greatly improved, long-term cycle accumulation will still lead to salt accumulation on each heating surface of the third-waste furnace, especially After the heating surface is replaced or overhauled, there may be rust, welding slag, oil and other debris inside. The accumulation of salt and debris will cause local overheating and poor water circulation, which seriously threatens the operation safety of the three-waste furnace. In high temperature environment, not easy to dissolve

[0003] The traditional flushing method mostly uses a hydrophobic pump to pump the desalted water directly into the superheater for backwashing, and washes each heating surface in sections. Big

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