Premixing low-nitrogen gas boiler

Abstract

The invention discloses a premixing low-nitrogen gas boiler which comprises a countercurrent rotational flow mixer, the countercurrent rotational flow mixer achieves hedging mixing of natural gas and air, a guide plate is arranged at a mixed gas outlet of the countercurrent rotational flow mixer, an upper flow equalizing plate and a lower flow equalizing plate are arranged below the guide plate, the upper flow equalizing plate is located above the lower flow equalizing plate, and the lower flow equalizing plate is located above the upper flow equalizing plate. A channel for enhancing mixing of mixed gas is arranged between the upper flow equalizing plate and the lower flow equalizing plate, the comb-shaped water-cooling combustor is arranged at the rear end of the lower flow equalizing plate, the combustion chamber is arranged at the rear end of the comb-shaped water-cooling combustor, and the ladder-shaped tapered hearth with the vacuum tube bundle arranged inside, the vacuum tube bundle and a working medium water vapor mixture in the vacuum water tank form an inner loop. Uniformity of mixed gas can be improved, combustion stability is guaranteed, the possibility of combustion tempering is reduced, the radiation heating capacity of a hearth can be improved, the local temperature of an outlet of the combustor and the overall temperature of the hearth are greatly reduced, and low-temperature and low-nitrogen combustion is achieved. And the cost is low, and large-scale popularization and application can be realized.

Description

technical field [0001] The invention belongs to the technical field of gas-fired boilers, and in particular relates to a premixed low-nitrogen gas-fired boiler. Background technique [0002] At present, low-nitrogen combustion technologies are widely used, such as staged combustion, flue gas recirculation, oxygen-enriched combustion, rich-lean combustion, etc., as well as denitration technologies such as SCR and SNCR. However, technologies such as oxygen-enriched combustion are only in the experimental stage and cannot be applied in actual production. SUMMARY OF THE INVENTION [0003] In order to overcome the above technical problems, the purpose of the present invention is to provide a premixed low nitrogen gas boiler, which can improve the uniformity of the mixed gas, thereby ensuring the stability of combustion, reducing the possibility of combustion tempering, and improving the radiant heating of the furnace. It can greatly reduce the local temperature of the burner o...

AI Technical Summary

Problems solved by technology

However, technologies such as oxygen-enriched combustion are only in the experimental stage and cannot be applied in actual production. Thick-lean combustion technology is widely used, but it is difficult to popularize and apply due to the high cost of SCR and SNCR technologies.

Images