The last 4 common failures of the deaerator

Fifth, the dissolved oxygen of the deaerator effluent is >7ppb

There are usually 6 reasons for the large amount of dissolved oxygen in the deaerator water: 1. The measurement value of the sampler is inaccurate due to leakage and other reasons; 2, the condensate water has high oxygen content; 3 is too much condensation water or condensation water temperature is too low; 4 When starting, the auxiliary steam supply deaerator switch door is too small, resulting in insufficient heating of the deaerator; 4 is that the four-stage extraction steam supply deaerator backstop door card is not astringent in place during the operation of the deaerator, resulting in reduced steam volume; 5 is that the deaerator exhaust tube is blocked or the exhaust door is too small; 6 is the unit load too fast.

There are usually 6 ways to solve the problem of dissolving oxygen in deaerator effluent: 1. Contact the accuracy of chemical calibration meter; 2 is to check the cause of the condensate water dissolved oxygen and treat it; 3 is to check to ensure the normal operation of each low; 4 is to adjust the auxiliary steam supply valve to ensure the stability of the deaerator heating steam; 5 is to check the status of the back-check door and electric door of the four-stage extraction deaerator to ensure the sliding pressure operation of the deaerator; 6 is to adjust the opening of the exhaust valve, open and start the exhaust valve when necessary to ensure that the deoxygenation channel is smooth; 7 is appropriate to reduce the lifting rate.

Six, deaerator overpressure

Deaerator overpressure will appear on the spot and the screen display deaerator pressure higher than the rated value, the screen deaerator pressure high alarm, deaerator safety door action three phenomena

There are usually four reasons for the large dissolving oxygen of the deaerator water: 1 is the overload of the steam engine, resulting in high extraction pressure of the four stages; 2, the deaerator water supply is improperly adjusted, and the water supply is suddenly reduced or even interrupted; 3 is the overpressure of the expansion container and the safety door refuses to move; 4 is #3 high pressure heater water level is too low to cause steam directly into the deaerator.

There are usually 6 methods to solve the overpressure treatment of the deaerator: 1 is to appropriately reduce the load of the unit; 2 is to check whether the automatic adjustment of the water level of the condensate tank and deaerator is normal, and cut to manual adjustment if necessary to maintain a certain amount of water in the deaerator; 3 is to check whether the pressure of the continuous discharge expansion vessel is normal. If the deaerator overpressure is caused by the overpressure of the continuous discharge expansion vessel and the safety door refuses to move, quickly close the drum continuous drain door and open the continuous discharge to the fixed drain bypass door for pressure relief; 4. If the deaerator overpressure is caused by the steam directly discharged into the deaerator by the #3 high addition, close the normal drain door of the #3 high addition quickly, check the reason for the low water level of the high addition and treat accordingly; 4 If the deaerator overpressure is caused by poor automatic regulation, cut it to manual regulation. If water shock occurs in the unit, it should be treated as water shock accident. 5. If the water level rises due to load or condensate flow, temperature, etc., the working condition should be adjusted to normal; 6 is to pay attention to the deaerator pressure after the deaerator is disabled to prevent the deaerator from overloaded operation.

Seven, the deaerator deaeration efficiency is not high, water soluble oxygen exceeded the standard

Cause deaerator deaeration efficiency is not high, water soluble oxygen exceeded the reason is usually the boiler system deaerator equipment after the installation, deaerator efficiency will not have too much change, usually under the actual operating conditions of deaerator deaeration efficiency has been low.

Solution deaerator deaeration efficiency is not high, water soluble oxygen exceeded the standard treatment method usually sodium sulfite, hydrazine, acetone oxime, carbamide hydrazine, acetaldehyde oxime, isoascorbic acid and sodium salt a total of 6 chemical agents to assist thermal deaeration use.

Eight, BF-31T coagulant protective agent completely replace the anti-corrosion efficiency of deaerator

In the case of water-soluble oxygen exceeding the standard, low efficiency of deaerator, deaerator failure, no supporting deaerator, no running deaerator, large operating cost of deaerator, outage of deaerator, and actual conditions that do not apply to the use of deaerator, the use of cost-effective, good anti-corrosion efficiency, BF-31T coagulant protective agent with small water supply dose per ton can completely replace the anti-corrosion efficiency of deaerator.