Micro-positive pressure combustion combined cooling energy-saving boiler

Abstract

The invention discloses an energy-saving boiler with micro-positive pressure combustion combined cooling, which includes a boiler body and a combined cooling system. Wall isolation; the combined cooling system is formed by connecting a water cooler and an air cooler, the water cooler includes a plurality of serpentine tube groups bent back and forth, and the air cooler includes a plurality of smoke pipes and air passages , the direction of the air passage is perpendicular to or intersects with the direction of the smoke pipe, and the smoke pipe is connected with an induced draft fan; the wind pressure of the blower is greater than the wind pressure of the induced draft fan. Increase the temperature of the water in the water cooler, increase the temperature of the air to be preheated, reduce the temperature of the flue gas and at the same time utilize the latent heat released by the condensation of water vapor in the flue gas. It not only improves the rigidity and anti-knock ability of the flue gas channel, but also helps to improve the thermal efficiency; it is equipped with a drum and an induced draft fan to reduce the combustion pressure, reduce the sealing requirements of the boiler body, and reduce the power consumption of operation.

Description

technical field [0001] The invention relates to an oil-fired boiler, in particular to a combined cooling and energy-saving boiler. Background technique [0002] At present, during the use of domestic gas-fired hot water boilers, the front wall where the burner is located often burns out, and the back wall often burns out or deforms, resulting in poor sealing of the boiler and a short maintenance period, which brings great inconvenience to maintenance. It is very inconvenient. Many boilers with membrane wall structure are positive pressure boilers, which put forward harsh conditions for blowers; although negative pressure gas boilers solve the problems of positive pressure boiler sealing and blowers, the power consumption is also greatly increased. [0003] Oil-fired boilers are usually hot water boilers because the exhaust gas temperature is not very high, which can basically meet the national standard upper limit of 180 ° C, so there is no economizer. Or directly use a ste...

AI Technical Summary

Problems solved by technology

[0002] At present, during the use of domestic gas-fired hot water boilers, the front wall where the burner is located often burns out, and the back wall often burns out or deforms, resulting in poor sealing of the boiler and a short maintenance period, which brings great inconvenience to maintenance. It is very inconvenient. Many boilers with membrane wall structure are positive pressure boilers, which put forward harsh conditions for the blower; although the negative pressure gas boiler solves the problems of positive pressure boiler sealing and blower, the power consumption is also greatly increased.

[0003] Oil-fired boilers are usually hot water boilers because the exhaust gas temperature is not very high, which can basically meet the national standard upper limit of 180 ° C, so there is no economizer

Or directly use a steam boiler economizer with a small water flow cross-section, so the system is complicated and the effect is not good

[0004] Usually the serpentine tube group of the economizer is composed of a single tube, so the water flow section is limited, the water flow velocity is high, and the water resistance is too large, which makes it difficult to meet the design requirements

[0005] Although some gas-fired hot water boilers are equipped with multi-tube economizers at the end, often due to poor design effects, the return water temperature of the system is still 70°C, and the exhaust gas temperature can only be reduced to about 100°C

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