Water pipe heating pipe residual heat boiler system arranged in sintering machine flue

Abstract

The invention provides a water pipe heating pipe residual heat boiler system arranged in a sintering machine flue and relates to the technical field of steel smelting equipment. The water pipe heating pipe residual heat boiler system comprises a large flue and a small flue of a sintering machine, a large flue heat pipe type evaporator, a small flue heat pipe type evaporator, a large flue primary water pipe type evaporator, a large flue secondary water pipe type evaporator, a small large flue primary water pipe type evaporator, a small flue secondary water pipe type evaporator, a steam pocket and a water feeding system, wherein the large flue and the small flue are provided with a plurality of gas guide pipes respectively. According to the water pipe heating pipe residual heat boiler system, the water pipe type evaporators and the heat pipe type evaporators are divided into a plurality of heat exchange modules to be directly arranged on the large flue and the small flue of the sintering machine, so that the reasonable and effective gradient utilization of energy sources is realized; equipment investment is saved and an occupied area is small; respective advantages of the water pipe type evaporators and the heat pipe type evaporators are fully played in a use process; the flue gas residual heat is recycled to the greatest extent; meanwhile, the production of the sintering machine is not influenced and the water pipe heating pipe residual heat boiler system can be widely applied to the industry of a steel enterprise sintering machine.

Description

technical field [0001] The invention relates to a water pipe heating pipe waste heat boiler system built in the flue of a sintering machine, which belongs to the technical field of iron and steel smelting equipment. Background technique [0002] In the existing iron and steel production equipment, the waste heat of exhaust gas from the belt cooler or ring cooler of the sintering machine has been generally recycled to generate steam for power generation or other purposes. However, the exhaust heat of the sintering machine itself has not been widely recycled, and only a few iron and steel enterprises have adopted external (built-in) waste heat recovery devices (waste heat boilers, steam generators, etc.). As we all know, after the sintering machine is ignited, as the sintering trolley moves from the nose to the tail, the induced draft fan on the flue is used to suck the combustion-supporting air for back-burning, and the exhaust gas after combustion is passed into the flue thr...

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Problems solved by technology

[0005] (1) The external arrangement places the waste heat boiler outside the main building of the sintering machine, which increases the floor space, equipment support, platforms and pipelines. For sintering plants, most enterprises do not have the conditions for external arrangement;

[0006] (2) The increased bypass flue is difficult to arrange;

[0007] (3) Added 6 large-diameter flue valves and increased equipment investment;

[0008] (4) For the exhaust gas that has the value of waste heat recovery from other air ducts that have not been led out, it cannot be accumulated and utilized, that is, energy cascade utilization cannot be achieved, and the temperature of superheated steam cannot be reliably guaranteed

[0011] The superheater and heat pipe evaporator are directly inserted into the large and small flue. When the sintering machine is running, the load changes frequently, which leads to local stress and leakage in the superheater and heat pipe evaporator, causing parking accidents and affecting the production of the sintering machine.

[0012] When the sintering machine is running, the load changes frequently, and the final exhaust gas temperature at the outlet of the large and small flue can not be controlled. It is easy to make the temperature of the flue gas lower than the dew point temperature, which affects the service life of the induced draft fan and pipes and other equipment.

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