3results about "Fire-box steam boilers" patented technology

The embodiment of the invention provides a water-cooled tubular flame low-NOx combustion structure suitable for a tubular steam generator, and relates to the technical field of combustion equipment, the water-cooled tubular flame low-NOx combustion structure comprises a furnace body and a heat exchange unit arranged in the furnace body; each heat exchange unit comprises a plurality of heat exchange pipes which are uniformly arranged in an annular array, and heat exchange longitudinal fins are connected between the adjacent heat exchange pipes; a combustion chamber is formed between the outer side wall of the heat exchange unit and the inner side wall of the furnace body, and a smoke channel communicating with the combustion chamber is formed in the inner side of the heat exchange unit. An igniter, an air inlet and a gas inlet are arranged on the side wall of the furnace body; the air inlet and the gas inlet are communicated with the combustion chamber along the tangential direction of the inner side wall of the furnace body, so that tubular flame surrounding the heat exchange unit is formed in the combustion chamber, and the high-temperature area of the tubular flame is close to the heat exchange unit as much as possible by adjusting the diameter and the length of the tubular flame; the low-temperature heat exchange tube containing heat exchange media such as water inside directly cools the high-temperature area of the tubular flame, and the effect of greatly reducing NOx emission is achieved.

This invention relates to the field of coal-fired power generation technology, and discloses a flexible temperature-adjustable coal-fired power plant boiler structure and temperature control method. The boiler structure includes a furnace with multiple flue gas outlets at the top; a dual-flue structure for single reheat units or a triple-flue structure for double reheat units. The dual-flue structure includes a main steam flue and a primary reheat flue, while the triple-flue structure also includes a secondary reheat flue. A flue gas distribution zone and flue baffles are provided between the furnace outlet and each flue inlet. Each flue contains a screen-type heating surface area, a high-temperature heating surface area, a low-temperature heating surface area, and an economizer area sequentially arranged along the flue gas flow direction. This invention achieves dynamic distribution of flue gas flow by adjusting the flue baffle opening through real-time temperature deviation acquisition. By separating the thermal paths of main steam and reheat steam, it significantly reduces the thermal coupling effect, improves the steam temperature regulation capability under low load, and is suitable for flexible configurations of T-type or π-type boilers, meeting the requirements of deep peak shaving operation.

The present invention discloses a vertical water tube built-in premixed membrane-type wall-cooling burner and a gas boiler. The gas boiler includes a burner, a furnace, a heat exchanger, and a flue. The burner adopts a burning manner of premixer built-in and membrane-type wall cooling, and a central side-by-side tube bundle or an arc-side tube bundle is taken as a head of the burner, the furnace is two semi-cylindrical spaces enclosed by the burner and heat exchanger, and the heat exchanger is a water tube bundle that is connected with an upper annular header and a lower annular header and extends radially along 1-3 circles of circular arcs. The burner and the heat exchanger may be exchanged. After being burned by the burner, premixed gas generates flue gas that flushes a corresponding heat exchange region and is collected and discharged through the flue. The present invention has a compact structure, low resistance, high heat exchange efficiency, short gas process, uniform mixing and distribution, deflagration prevention, and high safety, and is suitable for blended burning of natural gas with low / zero-carbon fuel and pure fuel burning. Burning temperature is low, load is uniform, an adjustment ratio is large, and NOx emissions are low; and the burner and the heat exchanger communicate with headers by using integrally or partially detachable flanges, which has high maintainability.