Method and device for stabilizing the operation of an impact dryer
An impingement dryer, stable operation technology, applied in the direction of the dryer section, air heater, fluid heater, etc., can solve the problems of local overheating of heat, interference with the state of the burner chamber, unstable flame, etc.
Active Publication Date: 2016-09-14
VALMET TECH OY
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Problems solved by technology
Furthermore, if gaps are inadvertently left or formed between the individual plates of the insulation, heat leaking through such gaps can create serious localized overheating problems
[0005] Impingement dryers integral to the burner head can also suffer from flame instability and flame control problems due to incoming air disturbing the state of the burner chamber
Method used
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[0041] figure 1 A schematic diagram of an impingement dryer is shown. The impingement dryer 1 comprises a hood 2 and a plurality of blowing nozzles 3, 3', 3", through which heated air is blown towards the web to be dried (not shown). A burner chamber is arranged inside the hood 2 4 and a pressure manifold 5, in which the dry air is heated to a high temperature in the burner chamber 4, for conveying the heated air from the burner chamber 4 to the blowing nozzles 3, 3', 3". The air in the impingement dryer is circulated by means of a circulation fan 6 . The fan 6 causes air to flow through the air intake channel 10 , through the air intake 11 , to the burner chamber 4 . The air flowing from the air inlet 11 through the burner chamber 4 to the inlet of the pressure manifold 5 is heated to the desired temperature as it flows through the flame 9 . exist figure 1 In , arrows are used to indicate the air flowing in the impingement dryer.
[0042] The first end 4 ′ of the burner ...
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The invention relates to a method and a device for stabilizing the operation of an impingement dryer in a paper or board machine or similar. The method includes arranging air to be heated to enter a burner chamber of an impingement dryer through an air inlet of the burner chamber, the air entering at an angle relative to at least one burner head in the burner chamber, the burner head The first end of the portion has a flame opening; the air in the burner chamber is heated by contacting the air with the flame; and the heated air is delivered from the burner chamber to the blowing member of the impingement dryer. Between the air inlet of the burner chamber and the flame opening of at least one burner head, a guide member comprising at least one hole is arranged in the direction of the air flow, and the air flow entering through the air inlet of the burner chamber is divided such that The first air flow passes through at least one hole of the guide member, and the second air flow passes through the gap between the guide member and the burner head.
Description
technical field [0001] The invention relates to a method and a device for stabilizing the operation of an impingement dryer in a paper or board machine. Background technique [0002] Impingement dryers in paper machines or similar equipment use burners to heat the air used to dry the fibrous web. The burner chamber can be integrated in the hood of the impingement dryer in order to save space and minimize heat loss. Ideally, the flame at the burner head should burn steadily in the burner chamber surrounded by combustion gases. Ideally, the air to be heated should flow from the inlet of the burner chamber over the flame, almost parallel to and without disturbing the flame. The hottest combustion gases should be directed to the pressure manifold of the impingement dryer from which the heated air is distributed to the drying components such as drying nozzles. [0003] In practice, however, the space within the impingement dryer hood is limited. As a result, the air is often ...
Claims
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IPC IPC(8): D21F5/18F24H3/00F24H9/00
CPCD21F5/044D21F5/18
Inventor 奥利·胡赫塔拉J·梅珂拉P·诺里基莫·卡西宁T·索尔M·索杰路德
Owner VALMET TECH OY