Dust cleaning system applicable to heat recovery boiler with complex heating surface

Abstract

The invention discloses a dust cleaning system applicable to a heat recovery boiler with a complex heating surface. The dust cleaning system comprises a lifter, a shot separating device, a shot distributer, a sealed flap valve, a separating device, a shot storing bin and a horizontal shot conveying device. The shot distributer is a slot type shot distributor, the slot type shot distributor is good in shot distributing effect, can guarantee full coverage on a first heat exchange tube layer, structurally effectively buffer falling speed of steel shots, and reduce impact of the steel shots to the heat exchange tubes and anti-wear strips; the steel shots in grain size of 2-4mm are utilized, compared with a conventional shot-falling dust cleaning system, the dust cleaning system is more applicable to dust cleaning of the heat recovery boiler utilizing a complex heating surface like a radiator fin / a fin / an annular fin tube to strengthen heat exchange, dispersity and distributing compactness of the shots on the heating surface are easier to guaranteed, and dust cleaning effect is good; and impact to the surfaces of the heat exchange tubes from the small-grain-size steel shots is lower, and service life of equipment is prolonged. The dust cleaning system applicable to the heat recovery boiler with the complex heating surface is capable of immediately effectively cleaning dust on the surface of the heating surfaced, is stable in running, low in investment and maintenance cost, and can maintain high efficient heat exchange of the complex heating surface.

Description

technical field [0001] The invention relates to a waste heat boiler ash cleaning method or system in the fields of waste heat recovery and power generation, in particular to a waste heat boiler that utilizes complex heating surfaces such as fins, fins, annular fins and other complex heating surfaces to strengthen heat exchange for flue gas waste heat recovery and power generation. Ash cleaning system to ensure the heat transfer efficiency of the heating surface. Background technique [0002] The use of fins, fins or annular fins to strengthen the heat exchange means to enhance the airflow heat exchange outside the heat exchange tube is a form of enhanced heat exchange that is often used in high-efficiency heat exchange tubes, which can greatly enhance the entire heat transfer process. , saves the metal consumption of heat exchange tubes, saves floor space, improves the economy of waste heat recovery equipment, and has good application prospects in industrial energy saving an...

AI Technical Summary

Problems solved by technology

A method and device for removing cohesive ash deposits in boilers announced by China (patent publication number CN100404956C) proposes a method that uses 0.5-10mm river sand, quartz sand and alumina particles as boiler tail flue and tube type. It is a device for removing ash particles on the heat exchange surface of the waste heat boiler, which acts on the heat exchange surface with the flue gas to remove ash deposits. This ash removal technology is that when the ash is highly cohesive, it is easy to form agglomerates with the granular materials and is not easy to separate At this time, the granular material is not suitable for recycling, especially for systems that need to recover dust; on the other hand, compared with fine-grained steel shots, the granular material is more likely to accumulate between the fins / fins / annular fins , affecting the heat transfer effect

The published invention patent (patent authorization number CN202066040U) proposes a pill cleaning system that uses horizontal and vertical screw conveyors to transport pills, and is equipped with a pill metering bin and a vibrating screen. This system is mainly aimed at the current pill cleaning system. Due to the poor airtightness of the system, a relatively airtight or closed falling pill ash removal system has been proposed, but there is no new explanation or innovation for the traditional working principle of the falling pill ash removal system.

To sum up, there is currently no invention or utility model patent for the falling shot cleaning system and device that can be used for finned tube waste heat boilers. The traditional falling shot cleaning system relies on the impact of large-sized steel shots on the heating surface Shock and vibration cleaning are not suitable for cleaning waste heat boilers with complex heating surfaces such as fins / fins / ring fins that rely on expanding the heating surface to enhance heat transfer, while foreign countries propose to use granular materials for cleaning The technology is also difficult to apply to waste heat boilers with complex heating surfaces such as fins / fins / ring fins, especially waste heat boiler systems that require dust recovery

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