Coal economizer for dry coke tailed-heat boiler under high-temperature and high-pressure

Abstract

The invention relates to a coal economizer which is used to coke dry quenching boiler under high temperature and high pressure, the contains stair coal economizer and ambipolar coal economizer, it is characterized in that these two coal economizer are installed in series, the export header of stair coal economizer connects with import header of ambipolar coal economizer, the import header of stair coal economizer connects with feed pump, the export header of ambipolar coal economizer which is fluid-bed and the rate of whose boil is higher than 10% connects with boiler drum; The invention enhances the value of export working medium enthalpy of coal economizer, reduces working medium enthalpy in the boiler drum, debases boiling point of water in the heating surface of the water wall, it is used to improve boiler's hydrodynamic force character such as pulsation, multiformity. The invention adopts coal economizer's disposal of high boiling rate to solve the security problem of water cycle of water wall of coke dry quenching boiler's rear flue under natural circulation under high temperature, high pressure and low load heating state, moreover, the invention also enhances operation safety of horizontal evaporator under natural circle.

Description

technical field [0001] The invention relates to a coal economizer in a high-temperature and high-pressure dry quenching coke waste heat boiler, in particular to a coal economizer with a high boiling rate. Background technique [0002] The steel pipe economizer has the advantages of compact structure, low cost, high pressure resistance and reliable operation, so it is widely used in boilers. [0003] Generally, economizers are mostly arranged horizontally, and the arrangement is staggered. According to the heating degree of water in the economizer, it can be divided into boiling type and non-boiling type economizer. Cast iron non-boiling economizers are widely used in boilers with working pressure lower than 4MPa. The water temperature at the outlet of the economizer should be at least 30°C higher than the saturation temperature under the corresponding pressure. Steel pipe economizers or economizers with fins and ribs on steel pipes are widely used in boilers with working p...

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is that the heat absorption of the water-cooled wall of the existing CDQ waste heat boiler is small, especially the heat absorption of the water-cooled wall of the front wall is insufficient, which cannot ensure the safe operation of the hydrodynamic cycle of the water-cooled wall of the front wall, which affects The entire boiler is safe to operate, and an economizer used in high-temperature and high-pressure CDQ waste heat boilers is provided. The outlet of the economizer has a boiling rate of about 10%. This economizer can not only make the water in the heating surface of the water-cooled wall The height of the boiling point is reduced, which improves the pulsation and multi-value properties of the evaporator, and is also conducive to the layout of the heating surface of the evaporator; and can improve the safety of the water circulation of the high-temperature and high-pressure natural water circulation CDQ waste heat boiler

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