Modular built-in waste heat boiler system on the flue of sintering machine with regulating function

Abstract

The invention discloses a modular residual heat boiler system having regulation functions and internally arranged in a smoke flue of a sintering machine, and belongs to the technical field of iron and steel smelting equipment. The modular residual heat boiler system comprises a big smoke flue, a small smoke flue, a steam pocket, a water supply system and heat exchanging modules, wherein the heat exchanging modules comprise evaporator modules, overheater modules and coal economizer modules; the big smoke flue and the small smoke flue are provided with multiple pipe joints respectively; each of the overheater modules, the evaporator modules and the coal economizer modules are arranged between every two pipe joins respectively; each evaporator-module water inlet pipeline is provided with an evaporator-module water inlet regulating valve respectively; and each evaporator-module gas outlet pipeline is provided with an evaporator-module gas outlet regulating valve respectively. By using the system, a residual heat resource, which is recovered at an existing field for the sintering machine, from the sintering machine is sufficiently utilized; the reasonable, effective and stepped utilization of an energy source is achieved; the equipment investment is saved; the floor area is small; generated overheated steam is used for power generation; and the modular residual heat boiler system has obvious economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting equipment, and in particular relates to a modularized waste heat boiler built in large and small flues of a sintering machine with an adjustment function. 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 or superheated 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, heat pipe 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,...

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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

[0010] The disadvantage of this built-in waste heat recovery device of the sintering machine is that the superheater and the heat pipe evaporator are directly inserted into the large and small flue, and the load changes frequently when the sintering machine is running, which causes local stress on the superheater and the heat pipe evaporator to cause leakage , causing a parking accident, affecting the production of the sintering machine, and the heat pipe evaporator cannot be dry-burned, and the explosive tube

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