The article flows to gas of diameter of low velocity of flow, bassoon in measuring a volume, the main problem of current presence undertook analytic comparative. Pass wind tunnel test, studied inside the character that the canal in Shuang Wenqiu Tibetan type surveys discharge plant and mathematical model. Form of the structure of the canal in the Shuang Wenqiu that elaborated this kinds of form, composition, installation, characteristic and applied advantage. In steely factory hot-blast stove support combustion gas and wind, air cooling, metric (blast furnace gas, Jiao Lu converter is gas, gas) the boiler that reachs a heat and power plant is diameter of bassoon of 2 wind, wind and other, low conduit of velocity of flow plan favorable result was gotten in measuring.

Keyword: Be in charge of in diameter of low velocity of flow, bassoon, large flow, Shuang Wenqiu, without straight canal paragraph

  is current, the aircrew of high capacity boiler of domestic heat and power plant the wind force of conduit of 2 wind, wind, the conduit answering heat of the cigarette volume of flue and generation set, discharge of the vapour that answer heat and ironworks hot-blast stove support combustion wind, air cooling is gas metric, and gas fired boiler of each big power plant and quantity of calculate of ties of gasworks trade trade, one of second component are machine wing section more or all fast canal is in charge of in measurement unit and standard language grave. As a result of all fast canal (A Niu Ba) the difference of output presses signal lesser, easy jam, and resolution is low, general need and profound difference are pressed change send implement form a complete set, measure precision not tall. The might that in last few years company of a few representatives rolled out the United States to produce cling to difference presses flowmeter, than A Niu Bajun on function fast canal raised one stride. But because get straight pipe paragraph, the limitation that span compares, in gas and metric go up to still be put in a lot of problems, cannot satisfy the requirement of the user. And volume of wing measurement unit is larger, control damage bigger, workmanship is more difficult, and easy jam signal pipeline, use the pipe in standard language grave, when bassoon diameter, its around provides paragraph of requirement continuously very long, cost is very high. Measure in the discharge of rectangular air channel in recent years in, people passes the mutation of pair of canals in Wen Qiu, the design gave the canal in rectangular Wen Qiu, had fair trial, but because pressure loss is bigger,wait for a reason, also restricted its promotion and application.
  is in the ironworks, the hot-blast stove of high capacity is entrance air cooling, clean gas reach support combustion the tubal diameter of wind exceeds 1200mm commonly, but the throttle unit that runs diameter to exceed 1200mm, at present home, abroad all did not establish a standard, the manufacturer home of common throttle unit cannot have demarcate and desired result. Because discharge span is big, force of medium press press and temperature impact are bigger, in low pressure, low velocity of flow works below condition, ask permanent pressure loss is small, use common throttle unit to come true very hard. Additional, before discharge measurement unit asks commonly, be in charge of continuously paragraph for 10D, be in charge of continuously after paragraph for 5D, bring about cost heighten. To solve these problems, a few companies of domestic introduce foreign product, if insert type mass flow plan (the type that heat up difference) , not only cost is high, and restrict as a result of craft condition, hydrous portion is much in medium wait for a variety of reasons to still exist metric the issue that forbid or cannot measure.
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