After Henan how china suppliers 1-20ton mercial boiler prices manufacturers of valves, pumps, pump packing change Henan boiler manufacturers boiler valves, pumps, pump, valve stem shaft at both stuffing box packing (commonly known as packing) seal is prevented from leaking pressed gland steam leakage. When servicing valves, packing gland should allow the process to leave some margin. Once this operation is to first heat the stuffing box or valve stem wear, leaking steam leakage occurs. A small leak, Henan boiler factory workers can compress some of the gland to stanch. In the pump, allowing some small amount of water leakage between the filler and the shaft, the shaft in order to maintain lubrication. But excessive leakage is not normal, it needs a little gland. Valve in the open or closed, the steam leakage is not allowed in the valve stem leakage. Henan boiler manufacturers in the valve packing leak is found, to look away from the valve cover Gland process margin, if it is greater than 5mm, you can tighten the gland, or exchange new filler. Henan boiler manufacturers to check whether the gland screw threaded corrosion, nuts are complete. If rust, can be used to clean rust wire brush, and then add some oil, nut Tim should change. Before adding a new exchange, or a filler, it must be tested whether a steam leak from the filler material after the valve is closed, is not determined until the steam leaking, before the new exchange packing. Henan boiler manufacturers generally two situations should be noted: 1 steam pipe always follow a direction of flow, since the general structure of the low-pressure valve as "lower entry on", so that after closing the valve, no packing corresponding steam, i.e., you can change filler. When there are two or more vapor sources, you have to close the other valve related before exchange packing. 2. After closing the valve bleed save gasoline, but also try to see if further steam leakage. If still steam leakage, indicating that the valve spool steam leakage, must take additional measures (such as open and then close a valve or emptying traps, etc.), if still steam leakage, it may not replace the filler, the pipe must wait until there is no pressure, side can be swapped filler. Henan boiler manufacturers add fillers or filler exchange procedure case: the first outer gland nut 1 loosened some of them with a screwdriver to pry the lid long, carefully observe whether to eject a filler. 2. The filler pop out, indicating that there is also pressure, then do not add filler, filler does not pop until proved completed when the pressure has been released, which may be removed nut, pry out the old packing, change or add new filler part of the filler. 3. Finally, and then the gland nut installed. Some of the high-pressure side of the valve has a sealing surface, even if the lower portion of the core and the valve open enough Q, stuffing box sealing surface, so that the steam does not leak. This case, the valve Henan boiler manufacturers may open enough, to ascertain when there is no pressure in the stuffing box, a filler may be added before or exchange packing. After the addition of a filler or replacement work is completed, before turning on the valve must be open trap pipe line, put water in clear, slowly open the valve only gradually turn down the trap, preventing water hammer occurs in the pipe.
Condensing steam china suppliers 1-20ton mercial boiler prices thermal efficiency condensing steam boiler analysis is the use of flue gas condensation heat recovery efficiency of latent heat is absorbed in the rear of the boiler flue gas and the sensible heat released by condensation of water vapor, to achieve the purpose of improving the thermal efficiency of the boiler. Boiler system, the exhaust gas temperature is generally 160 ~ 250 ℃, water vapor in the flue gas is still in a superheated state, it can not be condensed into liquid water and release latent heat of vaporization. As we all know, the thermal efficiency of the boiler low calorific value fuel is calculated without considering the heat loss of latent heat of vaporization of fuel in the high heating value. Thus the thermal efficiency of the conventional boiler generally only 87% to 91%. Waste heat recovery boiler is condensed, to which the exhaust gas temperature is reduced to 50 ~ 70 ℃, full recovery of the latent heat of condensation and sensible heat in the flue gas water vapor. Flue gas-fired condensing heat recovery steam boiler flue gas volume components typically produce 15% to 19%, the water vapor content of the oil-fired boiler flue gas is 10% to 12%, much higher than in coal-fired boiler water vapor content below 6%. Currently the thermal efficiency of the boiler are low calorific value calculation, although nominally higher thermal efficiency, but because of high natural gas, low calorific value difference of about 10%, the actual energy efficiency to be increased. To take full advantage of energy, reduce exhaust gas temperature, flue gas heat recovery physical, when the wall surface of the heat exchanger flue gas temperature below the dew point temperature, water vapor in the flue gas will be condensed, releases latent heat, low and high 10% calorific value difference can be effectively utilized.
, and china suppliers 1-20ton mercial boiler prices fuel gas boiler is not much difference in terms of the body structure, but due to the different heat value of fuel, the heating surface were adjusted accordingly. I.e., oil-fired boiler radiation large heating area, and the sucked gas boiler convection heating surface designed larger.
Since last year, the city of Yinchuan in Ningxia to develop clean energy alternative to coal heating work carried out, in order to adhere to the use of waste heat energy-based heating system, two years, a total removal of 212 coal-fired china suppliers 1-20ton mercial boiler prices units, designed over 20 million square heating area Meter. At present, Yinchuan City, the formation of a waste heat recovery and cogeneration-based, clean energy co-existence of a new pattern of heating, coal heating gradually withdraw from the stage of history.
According to Yinchuan City Housing Construction Bureau feedback, early last year, Yinchuan City, began to promote the implementation of "East of the West to give a" heat of long-distance heating projects, the long-distance transmission projects across the Yellow River, the basic realization of restructuring heat source, heat source interconnection point to ensure the city heating security and stability, environmental protection is of great significance.
At present, "East of the West to give a" central heating heating net charge of the project, the city branch, etc. have been completed, the east, the city water pipe network has been completed and started flushing cycle, is west of the water, water totaled 145,000 cubic meters.
At the same time, Yinchuan City, also build a heat source, thermoelectric Xixia complete the second phase of construction, the new 2 sets of 350,000 kilowatts supercritical coal-fired air-cooled heat generators, which can effectively replace Yinchuan City, 154 small coal-fired boilers, the annual generating capacity 3.85 billion kwh, heating capacity of 16.42 million square meters.
This year Yinchuan new cogeneration district heating area of 41 million square meters, the new heating pipe network 86 kilometers, is the largest investment project ever central heating, with the largest of the year.
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