12results about How to "Avoid Low Temperature Corrosion" patented technology

The invention relates to the technical field of unit operation safety, in particular to a method and system for preventing corrosion of a heat exchange tube of a flue gas cooler, and the method comprises the following steps: carrying out interlocking protection inspection on a flue gas cooler recirculation system, so that the interlocking protection operation of the flue gas cooler recirculation system is normal; the flue gas cooler recirculation system is checked before being put into operation, so that the flue gas cooler recirculation system is put into operation normally; the flue gas cooler recirculation system is subjected to operation maintenance, and normal operation of the flue gas cooler recirculation system is monitored and adjusted; by stopping the system, protective forced stopping is carried out on the recirculation system of the flue gas cooler, and operation is quitted; and accident treatment is carried out on the flue gas cooler recirculation system. The method has the beneficial effects that frequent starting and stopping caused by small load fluctuation are reduced through the set dead zone range, and the operation efficiency of the system is improved. Low-temperature corrosion is avoided by maintaining the water temperature of the inlet of the flue gas cooler within a safe range.

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.

The invention relates to an organic heat carrier furnace, which adopts fuel oil preheating, micro heat-conducting oil furnace waste heat recovery and absorption refrigerator cooling technologies, is beneficial to sufficient combustion of fuel oil of the organic heat carrier furnace and efficient recovery of flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, realizes combined cooling and heating, and is flexible and convenient to operate and adjust. The novel combined cycle operation system of the organic heat carrier furnace is formed, the problem that waste heat of the organic heat carrier furnace is difficult to recycle is solved, and the combined cycle operation system has good economic and social significance in implementation and popularization.

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.

According to the combined heat and power generation system of the organic heat carrier furnace, a micro heat conduction oil furnace system is adopted for recovering flue gas waste heat, an organic Rankine cycle unit is adopted for achieving thermal power generation of the flue gas waste heat, flue gas low-temperature corrosion is effectively avoided, meanwhile, efficient recycling and combined heat and power generation of the flue gas waste heat are achieved, operation and adjustment are flexible and convenient, and the combined heat and power generation efficiency is improved. The problems that waste heat of the organic heat carrier furnace is difficult to recycle, and energy-quality matching and utilization are difficult are solved, and implementation and popularization of the organic heat carrier furnace have good economic and social significance.

The invention discloses a supercritical thermal power generating unit flexible power generation cooperative waste treatment system. The system comprises a material conveying system, a supercritical water oxidation reaction system and a waste heat utilization system. According to the invention, supercritical water oxidation treatment of waste water is carried out by using residual steam generated by residual load of the boiler, harmless treatment of waste is carried out by using the residual steam while safe load operation of the boiler is ensured, energy in China is transformed to green and low carbon, and environmental protection is realized. And a feasible system scheme is provided for improving the safe operation of the deep peak regulation unit in China.

The present invention is an OGGH flue gas reheat treatment system and control method for a wet flue gas desulfurization process. The flue at the outlet of the desulfurization tower is divided into a first flue and a second flue. The first flue passes through a reheater shell and merges with the second flue. A heat exchange layer is arranged in the desulfurization tower, and its tube outlet is divided into two paths. One path passes through the reheater tube and returns to the heat exchange layer tube entrance, and the other path passes through a plate heat exchanger and returns to the heat exchange layer. The front of the reheater tube entrance is connected with the front of the plate heat exchanger entrance through a branch, and the plate heat exchanger outlet is connected with the reheater tube exit through another branch. The fluid in the above pipeline is an organic working medium. The present invention extracts the latent heat of the flue gas by taking heat after the desulfurization tower, avoids low-temperature corrosion, improves heat transfer efficiency, and prolongs the operating life of the equipment. By modifying the internal space structure of the desulfurization tower, deep cooling of the flue gas in the tower is achieved, and the PM 2.5 content of the exhaust smoke is effectively reduced. With the help of the OGGH system, a personalized heat allocation plan for the flue gas process of the power plant is realized.

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 discloses a converter flue gas cooling system, which comprises a first converter, a second converter, a first furnace cover and a second furnace cover, the first furnace cover and the second furnace cover are respectively arranged on the first converter and the second converter, the first furnace cover and the second furnace cover are connected with a heat exchange surface of a horizontal flue, and a smoke outlet A and a smoke outlet B are respectively arranged at two ends of the heat exchange surface of the horizontal flue. A gate valve A and a gate valve B are respectively arranged at the joints of the first furnace cover and the heat exchange surface of the horizontal flue and the joints of the second furnace cover and the heat exchange surface of the horizontal flue; and a gate valve C and a gate valve D are respectively arranged between the heat exchange surface of the horizontal flue and the smoke outlet A and the smoke outlet B. In order to reduce low-temperature corrosion caused by cold preparation, two converters share one set of heat exchange equipment. Low-temperature corrosion of standby converter cooling equipment is avoided, the service life of the equipment is prolonged, equipment maintenance funds are reduced, and long-term safe and stable production is ensured, so that comprehensive production benefits are improved.

The invention relates to a cascade type organic heat carrier furnace, which adopts a micro heat-conducting oil furnace system to recover flue gas waste heat, effectively avoids low-temperature corrosion of flue gas, realizes efficient recovery and utilization of flue gas waste heat, realizes combined supply of cold and heat, is flexible and convenient to operate and adjust, and forms a new cascade type organic heat carrier furnace combined cycle operation system. The problem that waste heat of the organic heat carrier furnace is difficult to recycle is solved, and the organic heat carrier furnace has good economic and social significance in implementation and popularization.

The utility model discloses a modularized air preheater capable of realizing heating furnace flue gas limit heat recovery, which relates to waste heat recovery and utilization technology and comprises a shell, a high-temperature module group and a low-temperature module group are arranged in the shell, a first flue gas inlet is arranged on the upper portion of one side of the high-temperature module group, and the lower shell side of the high-temperature module group is communicated with the shell side of the low-temperature module group. A second flue gas outlet is formed in the upper part of the other side of the low-temperature module group, a plurality of heat exchange tubes are vertically arranged in the high-temperature module group and the low-temperature module group, and bottom air boxes are arranged at the bottoms of the high-temperature module group and the low-temperature module group; flue gas enters from a first flue gas inlet in the high-temperature module shell side, passes through a flue gas communicating opening and is exhausted from a second flue gas outlet in the low-temperature module shell side, and therefore a U-shaped flue gas flowing channel is formed. Air enters the heat exchange pipes from the top of the low-temperature module set, passes through the bottom air box and is exhausted from the tops of the heat exchange pipes of the high-temperature module set, and therefore a U-shaped air flowing channel is formed. And the flow direction of smoke and the flow direction of air form a countercurrent double-U channel.

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.