Since the nineteen eighties, in small nitrogenous fertilizer enterprises, the diameter of hearth furnace gas continues to expand, however, automatic valve diameter not enlarged accordingly; some enterprises even to expand, but not in proportion to expand, blindness, the gas evolution of gas furnace affected.

 

Air valve: according to 18: 1 or 19: 1 as well ( cross-sectional area ratio of the furnace and the valve );

 

Gas valve: by 14 ∶1 is good ( cross-sectional area ratio of the hearth and the valve );

 

Recovery valve ( chimney valve ): by 9 ∶1 is good ( cross-sectional area and the ratio of the chimney valve );

 

The steam valve or nitrogen valve: 100 ∶1 is good ( cross-sectional area ratio of the furnace and the valve ).

 

Above for reference data, based on the raw coal enterprises adopt to select high-quality raw coal, can be of more large, poor raw coal can be appropriate is small.

 

Valve selection of misunderstanding

 

( 1 ) the air valve is usually installed in the gas stove, range 3000 ~ 4000mm away from the center tube. Safety baffle valve should be installed in the outdoor air pipe, and vent must upward, and the vent pipe, the gas furnace gas can drain leakage.

 

( 2 ) using the heat collection process has 3 gas valve : in the blowing stage, the upstream gas valve ( installed in the cyclone after) must be closed, to prevent gas leakage into the blowing gas blowing, some enterprises effective gas components in the atmosphere, and the valve is not closed in hair;②down the gas valve should be installed in the dust collector ( can be set to 1 simple baffle type filter); the main gas valve should be installed in the pipeline before the gas main.

 

At present many enterprises adopt briquette gasification, gas in the larger dust content, gas without the dust into the dust on the valve flush valve, more serious, to shorten the service life of the valve.

 

Some technical personnel that should be on the downside, gas valve installed in the furnace body near, its reason is blowing steam directly into the furnace, can save a lot of steam. In fact, this is no scientific reason, because the blowing gas, transferred to the blowing gas, furnace system filled with gas, the upstream gas valve closed, closed loop system furnace ( non vacuum state ), and the gas containing dust, high temperature high, will affect the life of the valve.

 

( 3 ) installation chimney valve: a blown-gas recovery of latent heat system called the recovery valve, also set up a vent valve, once the recovery system malfunction, blowing gas from the vent valve vent. The 2 valves should be installed after the cyclone dust collector.

 

( 4 ) in the blowing stage, many enterprises focus on blowing steam valve in the open position, is obviously wrong. Because the leakage steam valve ( there will be leakage automatic valve operation after a period of time ), in the hair with steam into the furnace, the effective gas composition blowing gas increased, consumption also increases accordingly.

 

The seat plate valve, gas installation direction errors

 

Since the nineteen sixties seat plate valve, there into, air installation problems. Because the seat plate valve with 90 °elbow, early use of the valve without experience, often according to the situation of arbitrary installation. Show that the long-term practice, the gas must be side ( or progress ) the only reasonable. Such as the use of from bottom to top, the lower valve plate to have gas, when the oil pressure fluctuation, the valve plate is pushed away in an instant, jumping phenomenon when the valve plate, valve plate valve seat can be heard the sound of impact, this phenomenon is caused by the oxygen content in semi water gas exceed the standard.

 

Misunderstanding of valve leakage problems

 

Any automatic valve through the use of a period of time, will produce leakage, leakage is divided into leakage and internal leakage.

 

( 1 ) the automatic valve leakage position in general, gland, gland leakage on the hydraulic oil leakage under cover, the gas, steam and air. Found that leakage and solve is relatively easy, as long as the replacement of a gland packing.

 

( 2 ) the automatic valve leakage is not easy to find, only use their experience to judge. Generally can be used to stick to check, if there is leakage, will hear " Chi Chi" gas. According to the provisions of the former Ministry of chemical industry: furnace repair gas every month, deal with the automatic valve inspection and leak testing; should be updated annually, if not update, resulting in leakage within the valve losses than update the valve costs much more.

 

Operation of the " valve " economic loss calculation

 

Under normal conditions, the gas furnace fuel in combustion or gasification reaction occurs, but in the stage of transformation, because of a valve is not closed in place, even if there is a gas producing furnace also can not be sent to the system, only waiting to close the valve in place before the gas sent. For example: in the blowing phase transition to the next stage of blowing, must wait for the upstream gas valve closed in place, can be sent to the downstream gas system, this process is called " valve to wait ".

 

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