An energy-saving gas supply boiler system, comprising: a steam boiler, a flue gas pipeline, a heat exchanger, a steam generator and an ejector. The steam boiler comprises a body, a combusting apparatus, a flue gas outlet, a water outlet and a high pressure steam outlet. The heat exchanger comprises a high temperature flue gas inlet, a medium temperature flue gas outlet, a cooling water inlet and a hot water outlet. Cooling water undergoes heat exchange with flue gas and flows out from the hot water outlet. The steam generator comprises a generator body, a hot water inlet and a low pressure steam outlet. The ejector comprises a high pressure steam inlet, a mixing steam outlet and a low pressure steam inlet. The high pressure steam inlet delivers high pressure steam to the ejector. The low pressure steam inlet delivers low pressure steam to the ejector.

An energy-saving gas supply boiler system, comprising: a steam boiler, a flue gas pipeline, a heat exchanger, a steam generator and an ejector. The steam boiler comprises a body, a combusting apparatus, a flue gas outlet, a water outlet and a high pressure steam outlet. The heat exchanger comprises a high temperature flue gas inlet, a medium temperature flue gas outlet, a cooling water inlet and a hot water outlet. Cooling water undergoes heat exchange with flue gas and flows out from the hot water outlet. The steam generator comprises a generator body, a hot water inlet and a low pressure steam outlet. The ejector comprises a high pressure steam inlet, a mixing steam outlet and a low pressure steam inlet. The high pressure steam inlet delivers high pressure steam to the ejector. The low pressure steam inlet delivers low pressure steam to the ejector.

A steam utilization system for producing a concrete pipe pile includes a steam conveying device, a steam curing pool, a plurality of reaction vessels, a steam generating device, a first steam distributor, a first pressure booster, a second pressure booster and a blowdown flash tank. A high-pressure steam inlet of the first steam distributor is communicated with the steam generating device, and a first steam inlet of the first pressure booster is communicated with a first high-pressure steam outlet of the first steam distributor. A second steam inlet of the first pressure booster is communicated with the steam conveying device, the steam outlet of the first booster is communicated with the steam inlet of each reaction vessel, a first steam inlet of a second pressure booster is communicated with the first steam distributor, a second steam inlet of the second pressure booster is communicated with the blowdown flash tank.