29 results about "Boiler feedwater" patented technology

The utility model relates to the technical field of boiler make-up water, in particular to a gas turbine boiler make-up water deoxidizing and desalting device which comprises a deoxidizing cylinder, a fixing frame is fixedly connected to the outer portion of the deoxidizing cylinder, a deoxidizing assembly used for deoxidizing make-up water is arranged in the deoxidizing cylinder, and the deoxidizing assembly comprises a rotating cylinder rotationally connected to the interior of the deoxidizing cylinder. A first rotational flow plate and a second rotational flow plate are fixedly connected to the exterior of the rotary drum, the length of the first rotational flow plate is larger than that of the second rotational flow plate, and a liquid inlet pipe and a material adding pipe are communicated with the top of the deoxidizing drum. The efficient deoxidization and desalination integration is realized, the problems of large occupied space and non-uniform fluid distribution caused by a split structure of traditional equipment are avoided, the introduction of a rotating structure improves the water flow disturbance, and the deoxidization and desalination process is more sufficient.

The present application belongs to the technical field of oil and gas field produced water treatment, and particularly relates to an ammonia nitrogen treatment system and method for oil field sulfur-containing produced water. The method comprises the following steps: sending the oil field sulfur-containing produced water into a first buffer pool, reducing sulfides through two-stage aeration of a cyclone aerator and an aeration nozzle device, overflowing from the first buffer pool to a second buffer pool when the first buffer pool reaches a water outlet height, and removing ammonia nitrogen by adding an ammonia nitrogen remover through a conventional dosing port of a dosing device. The present application fully utilizes the characteristics of aeration sulfur removal, and through the addition of a targeted chemical agent and the control of key parameters, purifies and softens the oil field sulfur-containing produced water in one step. After treatment, the water quality only needs to be further filtered by two stages of fine filtration, and the outlet water quality directly meets the steam boiler feed water requirements.

This invention belongs to the field of thermal power generation and discloses a steam preheating system for the primary air of a lignite boiler, including a steam matching system, a primary air heating system, and a feedwater heating system. This invention achieves stable full-load control of the primary air temperature in a lignite boiler above 350℃, solving the drying output problem of medium-speed mill pulverizing systems in lignite boiler applications. This invention is applicable to lignite power plant boilers of various capacities equipped with medium-speed mill positive pressure direct-fired pulverizing systems. It is suitable for the overall design of boiler systems in newly built lignite power plants, as well as for energy-saving upgrades and retrofits of the primary air systems in existing lignite power plant boilers. It is used to stably increase the inlet temperature of the primary air from the lignite boiler mill, ensuring the drying output and coal powder fineness of the medium-speed mill pulverizing system, while optimizing the steam supply of the boiler feedwater heating system, thus improving the overall operational economy and safety stability of thermal power generating units.

This invention provides an online measurement method for leakage from high-pressure cylinder exhaust to third-stage extraction steam in a combined-cylinder turbine unit, belonging to the field of combined-cylinder turbine operation monitoring technology. The method includes: establishing a typical data benchmark to obtain the benchmark third-stage extraction enthalpy value; real-time acquisition of boiler feedwater flow rate, exhaust parameters of each high-pressure heater and cylinder as raw parameters; preprocessing the raw data and calculating the enthalpy value at each state point based on the preprocessed data; establishing and solving the heat balance equations for each high-pressure heater based on the feedwater flow rate and enthalpy value to obtain the steam inlet flow rate of the third high-pressure heater; combining the benchmark third-stage extraction enthalpy value, high-pressure cylinder exhaust enthalpy, enthalpy after mixing of the third-stage extraction steam, and steam inlet flow rate of the third high-pressure heater to establish a set of mass and energy conservation equations for the mixer, and back-calculating the leakage amount; displaying the leakage amount in real time and providing early warning. This invention requires no shutdown modification and can accurately quantify the internal leakage from high-pressure cylinder exhaust to third-stage extraction steam online, effectively improving the unit's economy and safety.

The application discloses a distributed methanol hydrogen production-industrial boiler mixed combustion coupling trapping integrated device, and belongs to the technical field of methanol hydrogen production. The device comprises a device main body, a hydrogen production unit, a combustion coupling unit and a carbon trapping unit. The top of the device main body is provided with a feeding pipe. The hydrogen production unit is used for receiving raw materials and performing a reforming reaction to generate crude hydrogen. The combustion coupling unit comprises a heat recovery structure, a combustion chamber and a boiler feed water heat exchange cavity arranged around the combustion chamber. The carbon trapping unit is internally filled with adsorbent material. The combustion chamber in the application can form a thermal coupling relationship with the hydrogen production unit through the heat recovery structure, thereby providing a stable heat source for the methanol water reforming reaction in the hydrogen production unit, recycling the waste heat generated by the combustion link of the combustion coupling unit, realizing the deep coupling of hydrogen production heat energy and combustion heat energy, and improving the energy self-sufficiency and comprehensive energy efficiency of the whole device.

This invention provides a boiler control device, a power plant, a boiler control method, and a boiler control program that appropriately control the recirculation flow rate and make it usable as regulated power. [Solution] The boiler control device 50 has a switching unit 52 that switches between a once-through operation state and a circulating operation state, which has lower thermal efficiency than the once-through operation state, depending on the load. The switching unit 52 performs switching control to switch from the once-through operation state to the circulating operation state when the load falls below the first load, and when operating in the circulating operation state, it performs control to add a bias flow rate to the feedwater flow rate of the boiler so that the feedwater flow rate is appropriate to the boiler load.

This utility model belongs to the field of boiler feedwater pumps, and in particular, a heat-insulated boiler feedwater pump motor. It includes a feedwater pump housing for supplying water to a heat-insulated boiler, a motor, and a fixing mechanism. An impeller shaft is rotatably connected inside the feedwater pump housing. The output end of the motor is connected to one end of the impeller shaft through the fixing mechanism. The fixing mechanism includes rectangular blocks, a connecting rod, U-shaped locking blocks, a limiting block, and a limiting rod. Rectangular blocks are fixedly connected to both the output end of the motor and one end of the impeller shaft. A common connecting rod is inserted into one end of each of the two rectangular blocks. Two U-shaped locking blocks are slidably connected to the connecting rod, and each U-shaped locking block engages with one of the two rectangular blocks. This utility model allows for rapid assembly and disassembly of the motor and impeller shaft through its various components, significantly reducing equipment repair time and improving convenience and efficiency.

This invention discloses an islanded operation system, operation method, and parameter calculation method for a coal-fired heating unit. The feedwater pump group outlet is connected to the water-side pipeline of the high-pressure heater group, and the water-side outlet of the high-pressure heater group is connected to the boiler feedwater inlet. The main steam outlet of the boiler is sequentially connected to a high-pressure steam inlet regulating valve, a high-pressure cylinder, a boiler reheater, an intermediate-pressure cylinder, and a low-pressure cylinder. The rotors of the high-pressure cylinder, intermediate-pressure cylinder, and low-pressure cylinder are coaxially connected and connected to the generator rotor. The exhaust port of the low-pressure cylinder is connected to the condenser. A branch of the main steam pipeline of the boiler is connected to the steam-side inlet of the first high-pressure heater in the high-pressure heater group. The boiler reheat steam header is divided into three branches, respectively connected to the steam-side inlet of the third high-pressure heater, the deaerator, and the heating steam header. A branch of the heating steam header is connected to the steam-side inlet of the first low-pressure heater. This system enables islanded operation of the coal-fired heating unit and improves the boiler's heat exchange stability and efficiency.

This invention discloses a flue gas source heat pump and a steam corner tube boiler for recovering waste heat from flue gas, belonging to the technical field of corner tube boilers. The steam corner tube boiler includes a furnace, a flue gas cooler, a flue gas source heat pump, a flue gas condensing heat exchanger, a condensing air preheater, a secondary air preheater, and a chimney. A finned heat exchange tube bundle is arranged in the direction of the flue gas outlet in the furnace. The flue gas outlet of the furnace is connected to the flue gas cooler. The outlet of the flue gas cooler is connected in parallel to the flue gas source heat pump, the flue gas condensing heat exchanger, and the condensing air preheater, which are arranged sequentially from top to bottom. The boiler feedwater is directly connected to the flue gas source heat pump through an external water pipe, using refrigerant as a medium to improve the utilization efficiency of the latent heat of water vapor in the flue gas. The flue gas source heat pump, the flue gas condensing heat exchanger, and the condensing air preheater are arranged in parallel from top to bottom after the flue gas cooler to divert the flue gas, and together with the secondary air preheater, improve the efficiency of the steam boiler.

This invention discloses a safe and efficient deep peak-shaving coal-fired power generation system based on molten salt thermal storage and its operation method. The system includes a conventional coal-fired generator set and a coupled molten salt thermal storage system. The molten salt thermal storage system uses a method of sequentially heating molten salt with exhaust steam from the intermediate-pressure cylinder of the turbine and reheat steam for thermal storage, and a boiler feedwater bypass scheme for heat release. An SSS clutch is also used to increase the steam diversion flow rate during the thermal storage process. During thermal storage, under the condition of ensuring the minimum stable combustion load of the boiler, a portion of the exhaust steam from the intermediate-pressure cylinder of the coal-fired generator set and reheat steam are diverted to the molten salt thermal storage system. The two steam streams are used to sequentially heat the molten salt in the low-temperature molten salt tank. The complete diversion of the turbine intermediate-pressure cylinder exhaust steam for thermal storage is achieved through the SSS clutch. During heat release, without increasing the boiler coal feed rate, the system uses the molten salt thermal storage system to heat a portion of the condensate from the coal-fired generator set, thereby improving the load change rate of the coal-fired generator set.

The utility model discloses a coal fired unit quick peak load regulation and frequency modulation system of high temperature working medium heat storage of heat recovery system coupling relates to conventional heating power electric technology and energy storage technical field, including coal fired unit thermodynamic cycle system and high temperature working medium heat storage system, wherein, high temperature working medium heat storage system and coal fired unit thermodynamic cycle heat recovery system carry out the deep coupling, through the mutual cooperation of reducing steam turbine each stage extraction steam amount and high temperature working medium heat storage system energy supply, realizes the quick combined peak load regulation and frequency modulation of unit. First, when the unit needs quick load, through reducing steam turbine each stage extraction steam amount, realizes the quick promotion of unit power output, at the same time, the high temperature, high pressure saturated water stored in high temperature working medium heat storage tank produces a certain amount of saturated steam through pressure reduction to replace the boiler feed water in steam turbine each stage extraction heating heat recovery system, thereby guaranteeing that the boiler feed water temperature still keeps unchangeable or has the improvement, and then realizes the quick promotion of coal fired unit variable load response ability.

This invention relates to a high-salinity wastewater treatment system based on low-temperature multi-effect evaporation and thermal steam recompression, and pertains to the field of wastewater treatment technology. It includes a saline wastewater inlet pipeline, the outlet of which is connected to a first low-temperature multi-effect evaporation system. The pure water outlet pipeline of the first low-temperature multi-effect evaporation system is connected to a boiler feedwater pipeline. The high-salinity concentrated water outlet pipeline of the first low-temperature multi-effect evaporation system is connected to a nanofiltration unit via a resin softening unit. The pure water outlet pipeline of a second low-temperature multi-effect evaporation system is also connected to the boiler feedwater pipeline, and the high-salinity concentrated water outlet pipeline of the second low-temperature multi-effect evaporation system is connected to a sodium chloride evaporation and crystallization unit. This invention addresses the problem in traditional technologies where high-pressure membrane modules are sensitive to influent water quality, requiring complex enhanced pretreatment processes such as coagulation sedimentation, advanced oxidation, and ultrafiltration, making them unsuitable for industrial wastewater with varying compositions and resulting in high operating costs.

This utility model relates to the field of gas boiler technology and discloses a heat recovery device for a gas boiler, which solves the problem of poor performance of existing heat recovery devices. It includes a circulation recovery device body and a boiler body. A fan is installed at one end of the boiler body, and a flue pipe is installed at the other end. The circulation recovery device body is connected to the boiler body and the flue pipe. The circulation recovery device body consists of an atmospheric pressure water tank, a hot water circulation pump, a first circulation water pipe, an energy-saving device, a second circulation water pipe, a feed water pump, and a boiler feed water pipe. The energy-saving device is connected to the flue pipe. Both the first and second circulation water pipes are connected between the energy-saving device and the atmospheric pressure water tank. The hot water circulation pump is connected to the first circulation water pipe. The boiler feed water pipe is connected between the atmospheric pressure water tank and the boiler body, and the feed water pump is connected to the boiler feed water pipe. This heat recovery device enables the recovery and utilization of heat energy from boiler flue gas, avoiding significant waste of heat energy.

Process and plant for producing a synthesis gas by catalytic steam reforming of a hydrocarbon feedstock in a steam reforming unit, wherein water is removed from the synthesis gas as a process condensate, wherein boiler feed water is introduced in the process, and wherein the process or plant produces at least two separate steam streams: a pure steam which is generated from at least a portion of the boiler feed water by the cooling of synthesis gas, and a process steam which is generated by evaporating at least a portion of the process condensate by using synthesis gas, optionally together with pure steam and / or flue gas from the steam reforming unit.

This utility model relates to the field of coal chemical technology, and more particularly to a steam self-balancing dual isothermal converter system. In the steam self-balancing dual isothermal converter system, the mixed gas pipeline of water-gas and steam is connected to the mixed gas inlet of a medium-temperature heat exchanger; the mixed gas outlet of the medium-temperature heat exchanger is connected to the upper inlet of the first-stage isothermal converter; the lower outlet of the first-stage isothermal converter is connected to the converter gas inlet of the medium-temperature heat exchanger; the converter gas outlet of the medium-temperature heat exchanger is connected to a quencher; the converter gas outlet of the quencher is connected to a second-stage isothermal converter; the lower outlet of the second-stage isothermal converter is connected to a medium-pressure boiler feedwater heater; the converter gas outlet of the medium-pressure boiler feedwater heater is connected to a low-pressure boiler feedwater heater; and the converter gas outlet of the low-pressure boiler feedwater heater is connected to a converter gas output pipeline. This utility model can increase boiler water temperature and increase steam production without the need for external steam addition.

This invention discloses a waste heat boiler with integrated bypass function, comprising a waste heat boiler body and an internal flue gas direct passage. The waste heat boiler body is equipped with one or more stages of heat exchange tubes, through which high-temperature flue gas passes, exchanging heat with steam or boiler feedwater within the heat exchange tubes. One or more internal flue gas direct passages replace the external bypass; these passages pass through the middle of the heat exchange tubes; and their opening and closing are controlled by dampers. This invention offers the following advantages: because the flue gas direct passage is surrounded by hot flue gas, low-temperature conditions do not occur even with no flow, eliminating the problem of flue gas dew point corrosion. The waste heat boiler possesses a bypass function compatible with SCR denitrification, ensuring that flue gas emissions meet standards even when one waste heat boiler is switched off for maintenance, guaranteeing long-term stable operation of the unit.

This invention provides a method and system for recovering waste heat from intercooling in gas-fired steam turbines, belonging to the field of gas-steam combined cycle power generation and waste heat recovery control technology. It can significantly alleviate or solve the problems of direct emission of compression heat during the intercooling process of existing multi-stage compressors, insufficient coupling with the steam cycle, and unreasonable heat distribution under varying operating conditions. This invention collects gas turbine operating parameters, intercooler cycle parameters, steam cycle parameters, and unit load parameters to determine the current baseline amount of intercooler waste heat recovery. Based on this, it determines the target heat distribution ratio for the boiler feedwater heating branch and the low-pressure steam injection branch, and adjusts the circulation pump frequency and flow control valve opening accordingly. The intercooler waste heat is then used for feedwater heating and low-pressure steam injection through a waste heat exchanger, with safety assessments and feedback corrections performed. This invention improves the utilization rate of intercooler waste heat and the matching of the steam cycle, enhancing adaptability to varying operating conditions and operational safety.

This invention belongs to the field of molten salt energy storage and steam extraction / supply, and relates to a thermal power-molten salt energy storage coupling system and method that synergistically achieves energy-saving heating and flexible peak shaving, to solve the problems of difficult thermoelectric decoupling, limited peak shaving capacity, and large steam supply heat loss under low load conditions of thermal power units. The invention includes: an energy charging unit, connecting the turbine unit and power generation system, the molten salt energy storage unit, and the steam supply unit, which transfers part of the heat energy of the extracted steam to the molten salt; the released steam then enters the steam supply unit; the molten salt energy storage unit, containing high-temperature and low-temperature molten salt tanks; and an energy release unit, which uses high-temperature molten salt to heat boiler feedwater and deliver it to the boiler. This invention uses molten salt as an energy carrier and employs a synchronous charging and releasing method to utilize the superheat of the extracted steam, replacing water spray desuperheating to reduce heat loss, achieving energy cascade utilization and reducing boiler load. By switching the on / off states of valves, multiple operating modes are achieved, including energy storage, energy release, and cyclic energy-saving heating, realizing thermoelectric decoupling and deep peak shaving of the unit while meeting steam supply requirements.

The application discloses a method for increasing the regulation reliability of a boiler feed water regulating valve, comprising the following steps: determining the input of a selector according to the running speed of a feed water pump, the inlet flow and the outlet pressure of the feed water pump; selecting the minimum input by using a manual setting constant block in combination with the selector, and taking the minimum input as the deviation input of a PID controller; outputting a control instruction by the PID controller through linear combination of the deviation input; and controlling the feed water regulating valve according to the control instruction to achieve the effect of temperature reduction. The method can increase the boiler feed water by regulating the regulating valve, improve the throttling loss without affecting the safe operation of the reheater temperature reducing water, avoid the frequent opening and closing of the feed water regulating valve caused by load fluctuation during low load, and reduce the loss of the valve equipment and the energy consumption of the steam-driven feed water pump.

Disclosed is a flexible operation system for a coal-fired power unit to adapt to deep peak shaving. In the system, a pressurization module is connected in a steam inlet pipe between a high-pressure cylinder and an existing final-stage high-pressure heater. The pressurization module is provided with a pressurization device. An inlet of the pressurization module is connected to steam having a pressure level lower than a target steam extraction pressure level. An outlet of the pressurization module is connected to the steam inlet pipe of the existing final-stage high-pressure heater, and the outlet of the pressurization module is located downstream of a steam extraction isolation valve, so that the steam having the pressure level lower than the target steam extraction pressure level is pressurized by the pressurization device and then enters the existing final-stage high-pressure heater to heat feedwater, thereby increasing an in-boiler feedwater temperature of the unit under a deep peak shaving condition, and thus increasing a water temperature at an inlet and a water temperature at an outlet of an economizer and a flue gas temperature at the outlet of the economizer, reducing subcooling enthalpy of an inlet of a water-cooled wall, shortening a hot water section in the water-cooled wall, and maintaining a superheat degree of steam at an outlet of the water-cooled wall, so as to achieve dry-state operation of the boiler of the unit under the deep peak shaving condition, maintain hydrodynamic stability, and maintain continuous and stable operation of a denitration system.

This application discloses a scrubbing tower for recovering waste heat from gas and liquid processes, comprising: a tower body, with a slurry pool at the bottom and a scrubbing zone and a drying zone above the slurry pool, the flue gas inlet being located on the tower wall of the scrubbing zone and the top of the tower body; an inclined plate heat exchanger, disposed within the slurry pool and below the liquid surface, comprising several equally spaced and inclined hollow heat exchange plates; an oxidation blower, the oxidation air outlet of which is connected to the slurry pool via a duct, with the inlet located below the inclined plate heat exchanger; and a vertical plate heat exchanger, disposed in the scrubbing zone and between the liquid surface and the flue gas inlet within the slurry pool, connected in series with the inclined plate heat exchanger, comprising several equally spaced and vertically installed hollow heat exchange plates. The waste heat recovered by this scrubbing tower can be used to heat the raw water used for desalination in the water treatment workshop of a power plant, reducing the energy consumption for boiler feedwater heating in the power plant, and can also be used to heat the domestic shower water in the power plant, realizing the recovery and utilization of waste heat from gas and liquid processes in the scrubbing tower.

This invention provides a boiler chemical cleaning method that allows for more reliable protection of the ceiling and walls as non-cleaning areas while performing the cleaning. [Solution] The boiler chemical cleaning method includes a steam separator, a ceiling wall, and a superheater, which are arranged in order from the upstream side in the direction of steam flow generated by heating the boiler feedwater. The boiler further includes a first connecting pipe that connects the steam separator to the inlet side header of the ceiling wall, and the first connecting pipe has a rising section that rises upward from the inlet side header and an outlet formed in the middle of the rising section. The boiler chemical cleaning method includes a seal water sealing step of supplying seal water from the ceiling wall or the downstream side of the ceiling wall so that the seal water fills up to the height level of the outlet in the rising section, and a cleaning liquid injection step of injecting a chemical cleaning liquid into the steam separator after the seal water sealing step.

The application discloses a small-pipe-loss distributed industrial steam supply system and method suitable for power peak regulation, and the system comprises a steam turbine, a boiler for delivering steam to the steam turbine, a feedwater unit, a heat storage and release unit coupled with the boiler and the steam turbine, and a control unit; the heat storage and release unit comprises an adjusting assembly, a steam accumulator, a steam heat exchanger and an air source ultra-high temperature heat pump; the input end of the steam accumulator is connected with the feedwater unit and the steam heat exchanger, and the output end of the steam accumulator is communicated with the air source ultra-high temperature heat pump; the control unit is electrically connected with the adjusting assembly and the air source ultra-high temperature heat pump respectively, and is used for controlling the operating state of the adjusting assembly and the air source ultra-high temperature heat pump according to the steam turbine load signal, the electricity price signal and the steam extraction parameter in the steam accumulator. The application can improve the flexibility and peak regulation capacity of the unit, reduce the pipeline investment cost, and ensure stable heat supply of the unit.

The utility model relates to a kind of steam boiler using high-pressure water flue gas waste heat recovery system, including gas-water heat exchanger, external air preheater, buffer water tank, circulating water pump and its connecting pipeline: low-temperature water from external air preheater enters buffer water tank, then enters gas-water heat exchanger after boosting by circulating water pump, then returns to external air preheater, boiler feed water enters boiler furnace heating surface by economizer, produces saturated steam to heat externally, air enters burner by air blower, external air preheater, and high-temperature flue gas produced by fuel combustion, after being cooled by boiler furnace heating surface, economizer, gas-water heat exchanger, low-temperature flue gas formed is handled by subsequent equipment, then discharged from chimney by induced draft fan.

The utility model discloses a kind of deaerator exhaust steam recovery waste heat utilization device, including deaerator, exhaust steam recovery processing device, desalted water tank, feed water pump, preheating heat exchanger, vice coal economizer, deaerator is connected with the exhaust steam import of exhaust steam recovery processing device;The outlet of desalted water tank is connected with feed water pump, feed water pump is connected with the desalted water import of exhaust steam recovery processing device, the desalted water outlet of exhaust steam recovery processing device is connected with the medium import of preheating heat exchanger by pipeline, the medium outlet of preheating heat exchanger is connected with the medium import of vice coal economizer, the medium outlet of vice coal economizer is connected with the water inlet of deaerator by pipeline;The condensate outlet of exhaust steam recovery processing device is connected with the import of desalted water tank. Advantage: deaerator exhaust steam and desalted water heat exchange, desalted water is then into preheating heat exchanger, preheat boiler feed water before entering boiler, reduce heat energy consumption to a certain extent.

The application discloses a system and method for steam heating calcium hydroxide heat storage peak shaving, a reactor shell side is used for filling a mixture of calcium oxide and calcium hydroxide, a reactor inlet of the shell side is communicated with an outlet of a desalted water tank and is used for introducing desalted water into the shell side; a first inlet of a reactor tube side is respectively communicated with a boiler main steam pipeline and a steam turbine high-pressure cylinder, and a second inlet of the tube side is communicated with a boiler feed water pipeline. When the calcium hydroxide stores heat, part of the boiler main steam is introduced into the reactor tube side through the first inlet of the tube side from the boiler main steam pipeline, and is introduced into the boiler feed water pipeline through the second inlet of the tube side after heat release; when the calcium oxide releases heat, the desalted water of the boiler feed water pipeline is introduced into the reactor through the second inlet of the tube side, and is introduced into the steam turbine high-pressure cylinder through the first inlet of the tube side after heat absorption. The application utilizes a small-scale calcium hydroxide / calcium oxide heat storage system to assist a thermal power generating unit in peak shaving, the heat storage system realizes rapid load increase and decrease of the unit by extracting and generating steam, and can significantly improve a variable load rate of the unit.

The application discloses a feedwater heat storage peak shaving system for AGC load rapid response of a coal-fired unit, which comprises low-pressure heater groups, a deaerator, a feedwater pump, high-pressure heater groups and a boiler which are sequentially connected; the high-temperature hot water tank is provided with a fluid inlet and a fluid outlet, the fluid inlet is connected with an outlet main pipe of the high-pressure heater groups, the fluid outlet is connected with a boiler feedwater main pipe, the boiler feedwater main pipe is located between a fluid outlet of the feedwater pump and a fluid inlet of the boiler, and an isolation assembly and an adjusting assembly are serially installed on a high-temperature heat storage inlet bypass and a high-temperature energy release outlet bypass; the low-temperature cold water tank is provided with a fluid inlet and a fluid outlet, the fluid inlet is connected with a condensate water main pipe, and the fluid outlet is connected with an outlet main pipe of the deaerator; an isolation assembly and an adjusting assembly are serially installed on a low-temperature cold storage inlet bypass and a low-temperature energy release outlet bypass. The system is deeply coupled with the original thermal system of the coal-fired unit, and can realize bidirectional dead-zone-free rapid regulation of ascending and descending loads.

This application relates to the field of boiler feedwater deoxygenation technology, and in particular to a high-efficiency deoxygenation system and its optimized control method. It includes: establishing an operational control model with a temperature control structure; pre-setting multiple deoxygenation cycles, and setting control sub-models for each deoxygenation cycle based on unit operating data and the operational control model; acquiring monitoring data of the deaerator according to preset correction time nodes, and determining whether to generate correction instructions for the control sub-model based on the monitoring data; by adding a temperature control structure and operational control model, dynamically controlling the internal operating temperature of the deaerator using a temperature auxiliary bypass and temperature adjustment loop, ensuring that the deaerator can quickly reach and maintain the optimal deoxygenation temperature under various operating conditions; and by adding an auxiliary unit (i.e., a heating device), executing a switching sub-strategy during operating condition switching to quickly compensate for temperature deviations caused by different operating condition switching, ensuring continuous and stable deoxygenation effect.