Novel low-nitrogen-emission cold flame combustion integrated steam boiler

Abstract

The invention relates to a novel low-nitrogen-emission cold flame combustion integrated steam boiler which comprises a draught fan, an air preheater, a gas valve set, a gas distribution pipe, an air flue, an air distribution chamber, water cooling fire grates, hearths, convection areas, a flue, an energy saver, a steam pocket, a descending pipe, a descending communication pipe and a water level controller. A heating surface adopts a standard modular design and consists of two groups of membrane wall modules and a plurality of groups of fire grate convection area modules; the capacity of the boiler can be randomly combined and adjusted through the number of the fire grate convection area modules; each fire grate convection area module is composed of a module leading-in pipe, a module lowercollecting box, a fire grate finned pipe, a convection area light pipe, a convection area finned pipe, a module upper collecting box and a module leading-out pipe; each module can be divided into three functional areas, namely a water-cooling fire grate, a hearth and a convection area; the water-cooling fire grates are composed of porous ceramics and finned pipes; and mixed gas of air and naturalgas evenly flows to spiral fin areas on the finned pipes through small holes in the porous ceramics, and enters the hearths so as to be combusted after being preheated along channels among spiral fins.

Description

Technical field: [0001] The invention belongs to the technical field of gas-fired steam boilers, and in particular relates to a novel low-nitrogen emission cold-flame combustion integrated steam boiler. Background technique: [0002] At present, most of the natural gas-fired steam boilers below 30 tons use WNS type horizontal internal combustion fire tube steam boilers; besides WNS type boilers, there are LSS type cross-flow boilers for natural gas-fired steam boilers below 4 tons. [0003] These two furnace types have their own advantages and disadvantages. Among them, the WNS type boiler adopts a horizontal internal combustion full wet back structure, and is equipped with a high-efficiency threaded smoke pipe. Equipped with perfect thermal insulation outsourcing design, less heat loss, high thermal efficiency, large water capacity, good safety, long service life, convenient maintenance, especially suitable for long-term stable operation. But the disadvantage is that the w...

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Problems solved by technology

However, the disadvantage is that the water capacity is large, and it takes a long time to start the furnace in a cold state. When the boiler is operated intermittently for a long time, or when it is in hot standby operation, the overall energy efficiency is low.

[0004] The LSS type tubular boiler adopts a vertical water tube structure with small water capacity and fast steam production, which is especially suitable for intermittent operation; however, due to its small water capacity and the interface of steam and water in the tube, it has high requirements on water quality and short service life. In addition, the temperature of the smoke from the main body is high, even if an economizer is installed at the rear, the design thermal efficiency is relatively low

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