can a cracked steam boiler be repaired
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For smaller area of the region and family, you can use the boiler and other equipment; but for such a large area, such as area hotels, the boiler can not meet the daily water needs of the hotel, this gas boiler is able to play a very good role.
At 10:00 on September 6 and more, Harbin, a business is the purchase of a new boiler equipment installation, commissioning process when staff at a boiler pressure gauge index found that the performance of the boiler abnormal, but not so the commissioning personnel when the next step, a sudden loud noise, boiler explosion, a huge flame and furnace pressure debugging of oil spray everywhere, four commissioning personnel are subject to varying degrees of injuries, was taken to hospital for treatment .
Boiler is an energy conversion device, by entering the fuel to the boiler, chemical energy, power, etc., outputs a constant steam heat, hot water or organic heat carrier, to provide support for the heat industries. Meanwhile, the boiler is also a special equipment has a certain risk, when the boiler installation, commissioning, operation, etc., be sure to boiler operation safety first.
Now, Xiao Bian to operational safety considerations gas boiler summarize, we can refer to.
First, start, boost, steam supply
1, before the start of the preparatory work
Internal and external check: Check boiler, burner, a good state of the accessory device; action safety accessories, each of the valves, such as flexible instruments, the correct position.
Check the line voltage to meet the requirements, a variety of normal switch position, respectively, various auxiliary pump starts operating, the burner fan, oil pump is normal.
Boiler Feed: exhaust valve opening, to ensure the normal water level (just below the water level).
Firstly purging the furnace, induced draft fan suction time is usually about 10 minutes to ensure that no residual gas in the furnace, passing substitutions, and ignition for combustion air supply.
After firing is completed according to the adjustment amount of load required for combustion, the boiler into normal operation.
During startup, to closely monitor changes in water level, water boiler accident or occurrence textile full of water accidents.
Second, the normal operation
1, the water level
Fuel gas-fired boiler water table should be the red line indicating the high, medium and low water level, the operation shall not exceed the maximum safe level or below the minimum safe level.
Rinse water table at least once per shift, when there is suspicion of running water, rinse should always check.
2, steam pressure
Red lines indicate the working pressure gauge should have, so sensitive and reliable, the trap should be flushed at least once a week.
3, safety valve
Safety valve should seal intact, no leakage; once a week manually (or automatically) emission test, and begin start pressure, opening pressure, reseating pressure and test time, participants, etc credited maintenance log book u, for future reference .
Proceed as boiler water quality requirements of water quality testing personnel under the guidance of class 1 or 2 times sewage, sewage incident not too long, generally no more than 10 minutes.
Sewage should (preferably when shutdown), should be closely monitored sewage water level changes, and pay attention to safety at the time of low load, low pressure, high water level.
Many boilers when sharing a sewage mains, while sewage is prohibited.
1, the normal shutdown
After normal boiler shutdown should generally be reduced boiler load operation, press the boiler shutdown procedure. Actuated pump water to high water level, pressure steam boiler to be dropped after 0.3MPa flushing water table and sewerage operations, and finally close the raft, cut off the power supply control cabinet, wipe equipment, clean up the environment and health, For water, the water temperature should be below after 70 ℃, before proceeding.
2, emergency shutdown
When the boiler operation in the following situations should immediately shutdown:
Furnace water level drops below the minimum water level gauge visible edges.
Increasing water supply and other measures, but digital still continue to fall.
Boiler water level exceeds the highest visible water table level (full of water), the water still can not see the water level.
All water supply system water pump failure or malfunction, not water to the boiler.
Water gauge or safety valve all the failures.
Endanger the boiler element is damaged and the safety of operating personnel.
Combustion equipment damage, or furnace wall collapse and other red-hot boiler structure is a serious threat to the safe operation of the boiler.
Other anomalies endanger the safe operation of the boiler.
Before maintenance work should be well prepared, as before entering the drum interior work, must be of sufficient strength to connect all of the metal blocking plate spaced reliable steam, water, sewage and other operation of the boiler pipes, and the drum manholes and hand holes (boiler shell) is opened, so that air convection period.
After the completion of preparations to repair. Should ensure that the quarterly frequency of boiler maintenance and repair of the year.
Advances in technology to the boiler industry into new and innovative ideas, now the boiler manufacturers boiler are easy targets toward the operation forward, but in the use of the boiler, improper operation or other quality problems still exist, these failures will It is causing the direct cause of the explosion boilers. Therefore, when using the boiler must be in strict accordance with safety practices boiler, security incidents strangled in the cradle.
Working principle Deaerator large can a cracked steam boiler be repaireds now use more and more, with respect to ancillary equipment for the boiler is the most important influence oxygen, so the knowledge deaerator to collect a bit, to tell you about : deaerator main role is to remove oxygen in boiler water and other non-condensable gases, in order to ensure the quality of the feed water. Flow of dissolved oxygen, the metal will be corroded in contact with water, while if the gas accumulated in the heat exchanger, the heat resistance will increase, reducing the heat transfer device. Therefore, any gas dissolved in water is unfavorable, especially oxygen, it will be a direct threat to the safe operation of the equipment. In the thermal power plant using thermal oxygen, oxygen itself is Water Heat System in a hybrid heater, around the same time hydrophobic chemical replenishment and plant-wide high-pressure water heater hydrophobic qualified high-pressure, exhaust etc. You can import deaerator be used, reducing the loss of soda plant. Headless deaerator works: primary condensate from the low pressure heater (including supplement water) by adjusting the control valve inlet into the deaerator, mixed with other hydrophobic brightest in the deaerator, via nozzles or a porous the discharge tube, a water film is formed umbrella, a hybrid heat and mass transfer and bottom-heating steam, water quickly reaches the saturated temperature at the operating pressure. In this case, most of oxygen and other gases in water are parsed substantially achieve the purpose of removing oxygen. The precipitated oxygen from the water and other gases are continuously removed from the outer tube with the top of the exhaust vapors deaerator. Entering the deaerator heater drain will also have a high portion of the water flashing steam as a heating steam source, all of the heating steam condensate after heat release of the condensed water, oxygen mixed with water flowing through the outlet down together. In order to make the water temperature in the deaerator operating pressure maintained at the saturation temperature, it can be heated by reboiler steam is introduced into the tube deaerator. Oxygen by water through the outlet pipe into the high pressure water feed pump booster heater.