calderas de vapor pirotubulares industrial boiler usa
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2018 Kunming gas calderas de vapor pirotubulares industrial boiler usas How to play the highest performance? If you want to say to the boiler, it may be a lot of people know something about this in the. It can be said now is the boiler has become a symbol of the industrial age, especially in winter, a number of schools, hospitals, bath center or enterprise, making heating and hot water supply when this is required by the boiler to complete, so the current boiler application is still very extensive.
Premix gas calderas de vapor pirotubulares industrial boiler usa air consumption side of the fast introduction of gas boiler, by the addition of premix combustion technique, fuel combustion more fully, and the condensing means located in the tail of sufficiently high temperature flue gas discharged from a boiler flue gas re-use, two portions of the heat the secondary absorbent melted, the thermal efficiency of up to 108%. Similarly, we follow one cubic meter of natural gas heat is 8500kcal / m³ is calculated. Then, 1 cubic meter of natural gas available heat: 8500kcal / m³x thermal efficiency of 108% = 9180kcal / m³. 35000kcal calculated according to above mentioned 1 ton of water was heated from 15 deg.] C to 50 deg.] C needed, tons of hot water heated air consumption: 35000kcal ÷ 9180kcal / m³ = 3.812m³. The current natural gas prices per cubic meter of float about 3.5 million, 1 ton of hot water is required per heating costs: 3.5 × 3.812 = 13.342 million.
Fault which the calderas de vapor pirotubulares industrial boiler usa safety valve 1, a valve leak:, valves and valve seat sealing surface of the medium boiler safety valve leakage occurs exceeding the allowable level in normal working pressure, will continue to leak medium of the hard sealing material destruction. Therefore, the working medium is the steam valve, at a predetermined pressure, if the outlet end invisible to the naked eye, it can not find a leakage, the sealing performance is considered acceptable. 2, the valve body joint surface leakage: the upper and lower valve body at the binding surface leakage, leakage of the main reasons for this are the following aspects: a, the bolt tightening force bonding surface or tight enough bias, resulting in poor bonding surface sealing surface. b, in conjunction with the toothed surface of the valve gasket does not meet standards. c, the boiler safety valve in conjunction with the valve body surface flatness bad or hard cause seal failure impurities stayed pad. 3, the operation of the rear main valve impulse valve does not operate: this phenomenon is commonly referred to as tripping of the main valve. The main safety valve tripping seriously affect the safe operation of the equipment also could result in a major accident. 4, the rear main impulse valve back seat back seat valve delay time is too long: the main cause of such a failure has the following two aspects: on the one hand: a large amount of steam leakage chamber of the main valve piston or smaller, although the impulse valve back seat, but still in line with the pressure of the steam piston chamber is still high, pushing the piston downward force is still great, so causing the main valve back seat slow. Eliminate this failure, mainly through large open throttle valve opening and the orifice diameter is increased to be addressed, the throttle valve opening and the throttle aperture opening increases are big steam left in the pulse tube quickly drained , thereby reducing the pressure in the piston, so that acting on the piston downward thrust rapidly decreases, the spool valve effect of its own spring tension set up in the steam box with steam medium upward thrust rapidly back and under the main seat. On the other hand: Method friction between moving parts and fixed parts of the main valve is too large will cause the main valve back seat sluggish, it is to solve this problem with the gap of the main safety valve moving parts and fixed parts of control within the standard range. 5, low back seat pressure safety valve: safety valve reseating pressure is very low harm operation of the boiler, back seat pressure is too low will cause a lot of media time-out emissions, resulting in unnecessary energy loss. This failure occurred in the pulse valve springs A49H 200MW unit used to analyze the reason is mainly caused by the following factors: a, a large amount of steam drain valve spring pulses, this form of impulse after the valve is turned on, the media continue to discharge, pushing the main safety valve. B, the valve spool and the guide sleeve with the gap inappropriate, with the gap is too small, after a start impulse valve seat formed in this part of the instant high kinetic energy pressure throttle area, raise the spool, a delay seat back time, when the vessel to a lower pressure zone to reduce the kinetic energy of the pressure impulse valve seat back. A method to eliminate this failure: Check valve body and the guide sleeve dimensions of each portion, with the gap is too small, straight reduced valve flap valve sealing surface a vapor barrier or cap diameter increasing radial clearance between the valve flap and the guide sleeve, will not be increased excessively throttled flow area of the portion of the steam flowing through, forming the partial pressure increases the kinetic energy of a high pressure zone. Another reason making: All moving parts friction force, some parts of a jam, the solution is to carefully check all moving parts, strictly in accordance with maintenance standards for maintenance of the various components, with each component of the gap adjustment to the standard range, eliminate jam possibilities. 6, the safety valve chatter: jitter safety valve appear in the discharge process, called safety valve chatter, chatter occurs easily cause metal fatigue, mechanical performance of the valve drop, causing serious equipment problems, the reason is quite vibration occurs mainly in the following aspects: one is the improper use of the valve, selection of valve discharge capacity is too large (relative to the emissions must be concerned), the method is to eliminate the valve should make the choice rated displacement required emissions equipment as close as possible. Partly because the inlet pipe diameter is too small, smaller than the diameter of the valve inlet, the inlet pipe, or too much resistance, a method to eliminate the valve is installed in the inlet valve tube inner diameter not less dry or reduced inlet diameter inlet conduit resistance. Discharge pipe resistance is too large, resulting in the discharge excessive back pressure valve is caused by a factor chatter, can be addressed by reducing the resistance of the discharge pipe. 7, the safety valve frequency jump: jump frequency refers to the valve back seat, until a slightly elevated pressure, turn relief valve to open, repeated several times occur, a phenomenon known safety valve "frequency hopping." When the mechanical properties required safety valve safety valve reaches a predetermined opening height in the whole course of action, not allowed jamming, tremor and frequency hopping phenomenon. Frequency hopping phenomenon occurs sealing valve is extremely unfavorable, easily causing leakage sealing surface. Analysis of the main reasons the valve back seat pressure is too high related to the back seat pressure is high, medium, low emissions excess of the vessel, the safety valve has a back seat, when the operating personnel to adjust properly, pressure inside the container will soon It rose, it also caused the safety valve, as the case may be eliminated by the method to open a large degree of throttle opening. After the throttle opening large, source to the main steam safety valve piston chamber decreases, a smaller push the piston downward movement of the force, the less likely the main safety valve, thus avoiding the main safety consecutive starts.