A curved furnace of a natural gas-fired boiler

Abstract

A curved furnace of a natural gas-fired boiler, including a burner and a furnace body with a water-cooled membrane wall; The top corrugated membrane wall, the tail water-cooled wet back flue is formed between the back side of the tail corrugated membrane wall and the water-cooled membrane wall on the rear side of the furnace body, the top of the top corrugated membrane wall and the water-cooled membrane wall on the top of the furnace body A top horizontal passage is formed between the top horizontal passages, and there is a flue gas turning passage connected with the front side of the top horizontal passage between the front side of the top corrugated membrane wall and the water-cooled membrane wall on the front side of the furnace body, and the burner is arranged in the installation duct. The invention prolongs the flow time of the flue gas inside the boiler, and at the same time, these corrugated water-cooled membrane walls can double the heating area in a unit space, and the design of the corrugated structure can well destroy the boundary layer of the flue gas, It plays the role of enhancing heat transfer, which can absorb more heat and reduce the heat of high-temperature flue gas coming out of the furnace.

Description

technical field [0001] The invention belongs to the technical field of boiler energy saving and environmental protection, and in particular relates to a curved furnace of a natural gas-fired boiler. Background technique [0002] With the in-depth advancement of my country's "coal to gas" policy, natural gas boilers are also gradually moving from small tonnage to large tonnage boilers. One of the assembled boilers is the SZS type quick assembly. This kind of boiler is assembled in the boiler manufacturer. Then transported to the site, the user’s water and electricity can be used immediately, the installation time is short, the cost is low, and the product quality is high. After adopting the full-membrane wall structure, the boiler leakage rate is low, the boiler thermal efficiency is high, and the boiler load capacity is strong. Based on the above Advantages, the SZS-type natural gas-fired boiler has a good development prospect in the market. [0003] The typical structure of ...

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Problems solved by technology

[0004] In the process of enlarging the D-type boiler, because the structure of the boiler is too compact, the convection tube bundle and the furnace of the boiler cannot be too large, and after the boiler tonnage becomes larger, the quality requirements of the boiler steam are also high, but it is used to connect The upper and lower drums of the convection tube bundle should not be too large, so that if the steam quality of the boiler is to be improved, the diameter of the upper drum must be increased, and because it is delivered as a whole, the transportation size also limits the increase in the volume of this D-type boiler. Convection tube bundles, furnaces, boiler drums, and transportation restrictions have led to technical contradictions in the process of enlarging the D-type boiler, and the contradiction between the large-scale requirements of the boiler and the inability to arrange too many heating surfaces under the existing structure

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