Water-cooled corrugated flue-fired natural gas boiler

Abstract

The invention discloses a water-cooled corrugated flue-fired natural gas boiler. The boiler comprises an upper drum, a lower drum, a burner, a convection side membrane wall, a left membrane wall, a convection tube bundle, a straight membrane wall at the front end, a straight membrane wall at the rear end, a top membrane wall, a bottom membrane wall, a right membrane wall, and a corrugated furnace;the straight membrane wall at the front end is fixed with a mounting duct, the burner is set in the mounting duct to spray flames into the corrugated furnace, an airflow turning channel into the convection tube bundle is provided between the rear side of the left side membrane wall and the straight membrane wall at the rear end, and the front side of the convection side membrane wall is providedwith a smoke exhaust port. The water-cooled corrugated flue-fired natural gas boiler makes full use of the existing furnace space, and is provided with the corrugated furnace, which significantly reduces the boiler volume, facilitates the enlargement of the boiler, and reduces the overall transportation cost. The corrugated structure can destroy a boundary layer of the flue gas, play the role of strengthening heat transfer, and absorb more heat to reduce the heat of high-temperature flue gas from the furnace, thereby increasing the operating time of the boiler, and reducing the maintenance cost of the boiler.

Description

technical field [0001] The invention belongs to the technical field of boiler energy saving and environmental protection, and in particular relates to a water-cooled corrugated flue 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 increasing the size of the D-type boiler, the pressure, temperature and capacity of the medium in the boiler are increasing, and the addition of superheaters is becoming more and more common. However, due to the compact structure of the D-type boiler, the flue gas from Immediately after the furnace comes out, it enters the convection flue. Since the furnace is full of flames, the high-temperature flue gas generated during flame combustion does not fully absorb heat in the furnace and directly enters the convection flue. At this time, the temperature of the smoke is above 1350 ° C. If A superheater is arranged at the entrance of the convection flue, which will cause the temperature of the flue gas at the superheater to be too high. When the tube bundle absorbs too much heat per unit time, it will lead to the vaporization of the medium in the convective tube, causing a large-scale tube explosion. In the process of enlarging the D-type boiler, it encountered problems caused by the increase in boiler parameters and the decrease in the heat absorption capacity of the furnace. The flue temperature at the furnace outlet is too high, which leads to frequent technical contradictions in the convection flue tube explosion

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