4results about How to "Avoid Low Temperature Corrosion" patented technology

The denitration and dust removal integrated biomass grate boiler comprises a second flue, a third flue and a fourth flue which are sequentially connected with an outlet of a hearth, the lower end of the second flue is communicated with the lower end of the third flue, and the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue. A first platen superheater is arranged at the upper part of the hearth, a second platen superheater is arranged in the second flue, a coiled pipe superheater is arranged in the third flue, and denitration equipment, an economizer and a tail heating surface are sequentially arranged in the fourth flue according to the flowing direction of flue gas; dust removal equipment is arranged in the furnace top turning flue, and the dust removal equipment and denitration equipment are supported on a boiler body steel frame. The dust removal equipment and the denitration equipment are also arranged in the range of the boiler body, so that compared with the prior art, the lengths of the inlet flue and the outlet flue are greatly shortened, the heat dissipation loss is reduced, the boiler efficiency is improved, and the dust removal and denitration effects can be improved; and the floor area is small, and the construction cost is low.

This invention discloses a combined cycle unit waste heat boiler flue gas temperature control system and method, comprising: a data acquisition unit, a human-machine interaction unit, an intelligent control unit, and an execution and regulation unit. This invention enables one-click commissioning with fully automated operation, saving ≥1 hour of manual monitoring time during a single cold start, completely eliminating the risk of human error. It pioneers a 38% dynamic valve position limiting strategy based on load linkage, precisely balancing the contradictions between cold and hot starts, solving industry pain points such as the easy tripping of recirculation pumps and the easy accidental start-up of standby pumps after condensate pump frequency conversion retrofitting. Using 60℃ as a setpoint, it stably controls the inlet water temperature of the low-pressure economizer within the range of 55℃-65℃, avoiding low-temperature corrosion at the boiler tail end while maximizing waste heat recovery efficiency. It also features a graded early warning and safety degradation mechanism to enhance the system's anti-interference capability and operational safety.

This invention provides a boiler tail-end flue gas waste heat recovery and utilization system and its control method, relating to the field of boiler flue gas treatment technology. It includes a flue gas heat exchanger connected to the flue gas side of the air preheater, with a dust collector and an induced draft fan sequentially connected to the outlet end of the heat exchanger. The inlet and outlet of the heat medium water of the heat exchanger are connected to the heat medium water circulation pump and the inlet and outlet of the inlet air heater via pipelines to form a closed-loop circulation pipeline. The condensate heater and the inlet air heater are connected in parallel. A regulating valve assembly is installed on the heat medium water pipe, and a water heater is installed on the condensate reciprocating pipeline. Temperature sensors are installed at the inlet and outlet of both the air preheater and the flue gas heat exchanger. This invention solves the technical problems of independent adjustment of single-point parameters and the lack of clear valve operation requirements, achieving the technical effect of safely, stably, and efficiently recovering flue gas waste heat while simultaneously achieving corrosion and ABS prevention at the cold end of the rotary air preheater and rationally distributing the recovered heat through the flue gas cooler.

The utility model relates to a kind of garbage incineration flue gas temperature control and waste heat recovery system based on dry deacidification, belong to garbage incineration flue gas field, comprising: steam turbine, with the steam export intercommunication of waste heat boiler;Phase change heat exchanger, main body is arranged in waste heat boiler export flue, including the heat exchange of flue gas discharged with waste heat boiler evaporative heat exchange section and the condensation heat exchange section located evaporative heat exchange section top and with the heat exchange of condensate water discharged by steam turbine, phase change working medium in the phase change heat exchanger carries out phase change circulation in heat exchange pipe: absorption flue gas heat and evaporate into gaseous state, condense into liquid state after releasing heat to condensate water;Pressure pump, set in condensate water branch pipeline, lead out condensate water and pressurized introduction phase change heat exchanger's condensation heat exchange section carries out heat exchange, to solve the low deacidification efficiency, flue gas waste heat recovery rate low and low temperature corrosion problem caused by flue gas fluctuation in traditional dry deacidification process.