1526 results about "Economizer" patented technology

The invention belongs to the technical field of power station boiler waste heat recycling energy-saving equipment and relates to a plate-and-shell type coal economizer. The plate-and-shell type coal economizer comprises a corrugated plate heat exchange core body (1), a heat exchanger shell (2), a first and a second water inlet / outlet water tank (3, 3') and a first and a second exhaust gas inlet / outlet pipeline (4, 4'), wherein the corrugated plate heat exchange core body (1) is mounted in the heat exchanger shell (2), the first and second water inlet / outlet water tanks (3, 3') are respectively arranged at the upper and lower ends of the front side of the corrugated plate heat exchange core body (1), and the first and second exhaust gas inlet / outlet pipelines (4, 4') are respectively arranged at the upper and lower sides of the corrugated plate heat exchange core body (1). The plate-and-shell type coal economizer solves the problem that the length of a water passage needs to be increased to solve the problem of unapparent water heating due to the great difference between an exhaust gas density and a water density, and meanwhile, a corrugated passage at the exhaust gas side enables the exhaust gas flow turbulivity to be increased and the heat transfer efficiency to be improved; the blockage due to ash accumulation happens rarely, even if the ash is accumulated, the cleaning is easy to finish.

The invention provides a sound wave generator soot blowing test method and system. The method comprises the steps that an experiment platform for simulating the working environment of a low-low-temperature economizer is built, and a test sample and sensing equipment are installed; setting power output parameters including a fixed power level and pulse power modulation parameter, a soot blowing frequency and phase control parameter, a time period and adaptive adjustment parameter, a sound wave frequency and an airflow velocity and vector control parameter; soot blowing operation is carried out, data are collected through sensing equipment, the soot coverage rate and particle information are obtained through an optical imaging sensor, and the pressure intensity generated by sound waves at the position where soot particles are located is obtained through an acoustic sensor array; calculating cleaning efficiency, and performing adjustment and iterative experiment on parameters according to the cleaning efficiency and data feedback; comprehensive optimization of the soot blowing process of the sound wave generator is achieved, the soot blowing effect of the low-low-temperature economizer is improved, then the overall operation efficiency of energy equipment is improved, the service life of the equipment is prolonged, and the requirements for environmental protection and energy saving are met.

The invention provides a solar energy-air energy composite heat pump system based on self-contained energy storage cascade application and a control method. The solar energy-air energy composite heat pump system comprises a heat pump host module, a solar module and a hydraulic module. Hot water generated by the solar heat collector is accumulated in the energy storage water tank and serves as an external heat source for active enhanced vapor injection to improve the performance of the heat pump. An active enhanced vapor injection device is designed for a heat pump host module, a refrigerant in an economizer absorbs heat of heat storage hot water, is jetted to a middle pressure cavity of a compressor and is converted into heating capacity, and the performance of the heat pump is greatly improved. When it is detected that the temperature in the heat storage water tank is reduced to a certain temperature, the flow direction of the heat storage hot water is switched through the switching assembly, the heat storage hot water is pumped to the heat pump fluorine-water heat exchanger for heat exchange, the heat pump performance is improved, and cascade application of the heat storage hot water is achieved. Refrigerant flows in the fin type heat exchanger and the fluorine-water heat exchanger are controlled by respective electronic expansion valves, and the opening degrees of the fin type heat exchanger and the fluorine-water heat exchanger are adjusted according to respective air suction superheat degrees, so that respective optimal heat exchange effects are realized.

The invention relates to the technical field of automatic control, and discloses an intelligent ash deposition prevention self-cleaning system for a flue of a low-temperature economizer of a coal-fired power plant. According to the system, data such as temperature, humidity and flue gas components in a flue are acquired in real time through the data acquisition module, the dust deposition condition and cleaning requirements of the flue are accurately evaluated, the omission phenomenon caused by misjudgment in the manual cleaning process is avoided, the data processing and analysis module improves the data processing precision, and the data processing and analysis efficiency is improved. The system can also monitor the running state of the flue in real time, so that a cleaning instruction is automatically sent out when necessary, the timeliness and effectiveness of cleaning work are ensured, the cleaning execution module can efficiently remove accumulated dust while reducing the temperature of the flue through a mode of combining high-pressure airflow, a vibration device and a water spraying system, the time needed by cleaning is remarkably shortened, and the cleaning efficiency is improved. And the monitoring feedback module evaluates the cleaning effect, it is ensured that each time of cleaning can reach the preset standard, and the intelligent level and safety of flue cleaning are further improved.

The utility model discloses a waste heat boiler ash removal device which comprises a waste heat boiler body, a coal economizer arranged in the waste heat boiler body and a spraying assembly arranged below or on the side face of the coal economizer, and a smoke inlet and a sewage outlet are formed in the lower portion of the waste heat boiler body. The spraying assembly comprises a plurality of spraying heads, each spraying head is provided with a water outlet hole and a dustproof column, the dustproof columns are matched with the water outlet holes to close or open the water outlet holes, the dustproof columns are in sliding fit with the water outlet holes, the sliding direction of the dustproof columns is parallel to the axial direction of the water outlet holes, and the dustproof columns are arranged on the spraying heads. And the water outlet hole is arranged towards the coal economizer. The ash removal device for the waste heat boiler is reasonable in structure, the spray header can be prevented from being blocked, the water outlet effect of the spray header each time is guaranteed, and therefore the cleaning effect on an economizer pipeline is guaranteed.

The invention provides a CFB (circulating fluid bed) boiler for heating molten salt by sucking smoke in a tail flue, and belongs to the technical field of CFB boilers coupled with molten salt heat storage. The problem that the scale and efficiency improvement of industrial production are seriously limited due to the fact that a traditional CFB boiler unit is generally lack of high-capacity and high-parameter industrial gas supply capacity is solved. The system comprises a hearth, a separating and returning system and a tail flue, the separating and returning system comprises a cyclone separator, and a low-temperature superheater high-temperature section, a low-temperature superheater low-temperature section, a high-temperature economizer, an SCR device, a low-temperature economizer and an air preheater are sequentially arranged in the tail flue in the flowing direction. A high-temperature flue gas leading-out pipeline is arranged between the low-temperature superheater high-temperature section and the low-temperature superheater low-temperature section, a low-temperature flue gas leading-out pipeline is arranged between the high-temperature economizer and the SCR device, and the outlet end of the high-temperature flue gas leading-out pipeline and the outlet end of the low-temperature flue gas leading-out pipeline are both connected with the inlet end of the mixer. The device is mainly used for the CFB boiler unit.

The embodiment of the invention discloses a feedforward prediction control method and device for a wide-load denitration composite hot water recirculation system. The method comprises the steps of determining an operation working condition mode of a boiler based on obtained real-time load and critical load of the boiler, and determining working medium flow directions of an economizer bypass pipeline and a hot water recirculation bypass pipeline in the composite hot water recirculation system in the operation working condition mode so as to construct a working condition operation model; based on the boiler real-time load, the water cooling wall inlet temperature, the economizer bypass pipeline water flow and the hot water recirculation bypass water flow in the working condition operation model and the feedforward predictive control model, the inlet smoke temperature and the economizer outlet supercooling degree of the composite hot water recirculation denitration system are cooperatively controlled; according to the technical scheme, the accuracy and the flexibility of inlet smoke temperature adjustment of the wide-load denitration composite hot water recirculation denitration system under deep peak regulation can be improved, so that the safety and the stability in the deep peak regulation process of a unit are improved, the system operation efficiency is improved, and the control operation difficulty is reduced.

The invention provides a low-temperature heat pump liquid impact prevention and supercooling degree strengthening control method based on dual-mode self-adaptive regulation and control, which comprises the following steps: monitoring the bottom temperature of a gas-liquid separator and the change rate of the temperature, and controlling the supercooling degree of the gas-liquid separator on the basis of the difference value between the temperature and a preset safety critical temperature and the difference value between the change rate and a preset minimum temperature rise rate, constructing a liquid impact risk index; based on the liquid impact risk index, the pulse power excitation intensity is calculated, the number of opened spraying channels is selected according to the pulse power excitation intensity, the pulse duty ratio of each channel is adjusted, the high-temperature gas-state refrigerant is controlled to be injected into the bottom of the gas-liquid separator, and the liquid-state refrigerant is driven to evaporate; generating a mode switching score, and generating a mode switching signal when the mode switching score exceeds a mode switching threshold value and the temperature of the gas-liquid separator reaches a safety lower limit; and according to the mode switching signal, a supercooling degree strengthening mode is switched, and the opening degree of an economizer branch electronic expansion valve is adjusted according to the deviation between the current supercooling degree and the target supercooling degree.

The invention discloses an SCR denitration system for biomass boiler flue gas, and belongs to the technical field of SCR denitration, the SCR denitration system comprises an SCR denitration device, a flue gas diversion pipeline, a diversion mechanism and a detection mechanism, the SCR denitration device comprises a reactor body and a plurality of groups of catalyst modules arranged in the reactor body; the flue gas guide pipeline is respectively communicated with the economizer and the gas inlet end of the reactor body; the detection mechanisms comprise a plurality of groups of flow guide mechanisms, and each group of flow guide mechanism is positioned above the corresponding catalyst module and is used for guiding, regulating and controlling the flow direction and the flow rate of the biomass boiler flue gas; each detection mechanism is located between the corresponding catalyst module and the flow guide mechanism, and the detection mechanisms are used for monitoring the flow speed and distribution of the biomass boiler flue gas flowing through the catalyst modules. The flue gas flow of the biomass boiler can be accurately controlled, uniform distribution of the flue gas of the biomass boiler in the catalyst module is ensured, the service life of an SCR denitration catalyst is prolonged, and the working efficiency of the SCR denitration catalyst is improved.

The invention discloses a once-through boiler separator water inlet intelligent early warning method based on dynamic fusion of ceiling temperature, feed water temperature and separator pressure, and belongs to the field of thermal power plant unit once-through boiler operation control. According to the method, parameters such as the ceiling temperature, the economizer feed water temperature, the separator pressure change rate, the feed water flow and the steam flow are collected in real time, a dynamic enthalpy value calculation model is built to solve the separator inlet working medium enthalpy, and a water inlet risk index evaluation model is built. Setting a working condition self-adaptive coefficient according to different loads, and when the risk index absolute value is greater than or equal to 50, triggering an alarm to prompt to increase the fuel quantity and reduce the feed water flow. According to the method, the problem of misjudgment caused by excessive dependence of false water level compensation on the pressure change rate under the deep adjustment working condition is solved, the water inlet risk identification precision of the separator is improved, the early warning response time is advanced by 10-15 seconds, misoperation under the deep adjustment working condition can be effectively avoided, and the method is suitable for the deep peak regulation working condition of the supercritical / ultra-supercritical once-through boiler.

The invention relates to the technical field of coal-fired thermal power generation, in particular to a flue gas waste heat operation control method and system.The state of a valve is intelligently adjusted through a waste heat valve control optimization algorithm, a series connection mode or a parallel connection mode of a two-section economizer is flexibly selected in cooperation with a double-section adjustment algorithm, and the cold end temperature of an air pre-heater is monitored in real time in combination with a low-temperature protection algorithm; according to the system, the temperature of flue gas at an outlet of the air pre-heater is effectively reduced, heat loss is reduced, the energy utilization efficiency is improved, meanwhile, the dust collection effect of the electric dust remover is enhanced, low-temperature corrosion and ammonia salt blockage are prevented, and the system has a flexible operation mode switching function and is suitable for popularization and application. Safe operation under the deep peak regulation working condition is ensured, the service life of equipment is prolonged, and the maintenance cost is reduced.

The invention discloses a tail afterburning system and method for increasing SCR inlet smoke temperature, the tail afterburning system comprises a boiler and a combustion chamber for mixed combustion of hydrogen and air, an economizer is arranged on a smoke channel of the boiler, a tail flue of the boiler is connected with a smoke inlet of an SCR denitration device, a smoke outlet of the combustion chamber is connected with the tail flue through a third bypass flue, and the third bypass flue is connected with the tail flue through a fourth bypass flue. The combustion chamber is connected with an outlet flue of an air pre-heater of the boiler through a second bypass flue, an induced draft fan is arranged in the second bypass flue, and the induced draft fan is used for feeding smoke in the outlet flue of the air pre-heater into the combustion chamber. The bypass flue and the oxyhydrogen burner are arranged at the tail, afterburning is conducted through the tail burner, hot flue gas obtained after afterburning enters the tail flue to be mixed with low-temperature flue gas, the SCR inlet temperature is effectively increased, it is ensured that SCR is normally put into operation, carbon emission is reduced, and emission control over pollution gas under the low load of a coal-fired unit is effectively achieved.

The invention relates to the technical field of waste heat recovery equipment, in particular to a sintering rotary furnace waste heat composite recovery structure which comprises a rotary furnace body, a boiler body, an energy saver and a flue gas treatment device. The two ends of the economizer are connected with a boiler body flue and the flue gas treatment device respectively, the flue gas treatment device comprises a compression cavity, a piston, a driving device, a water outlet, an exhaust port, a vortex tube and a recovery cavity, the compression cavity is communicated with the economizer through a throat pipe, the piston is located in the compression cavity and forms a moving pair with the compression cavity, and the driving device can drive the piston to move. The water outlet and the exhaust port are communicated with the compression cavity, the recovery cavity surrounds the outside of the compression cavity and is communicated with the hot air outlet of the vortex tube, four-time waste heat recovery is achieved through mutual cooperation of all the components, and the waste heat recovery efficiency is high.

The invention discloses a control method, device and equipment of a semi-dry method deacidification system and a medium, and relates to the technical field of household garbage incineration power generation treatment. Determining a prediction error value and inputting the prediction error value into a feedforward controller of the first PID controller; the feed-forward controller determines a lime slurry flow feed-forward compensation value according to the prediction error value; based on the lime slurry flow feedforward compensation value, a lime slurry flow error compensation value output by a main controller of the first PID controller and the actually measured lime slurry flow serving as a disturbance compensation value, a first control instruction used for controlling the opening degree of a lime slurry adjusting valve is output through an auxiliary controller of the first PID controller. The method is suitable for a control scene of a semi-dry deacidification process.

The invention relates to the technical field of flue gas waste heat recovery, and discloses an online regulation and control system and method for regulating the flue gas waste heat recovery amount of a wide-channel plate type low-temperature economizer. The system comprises a flue gas treatment main process assembly, a low-temperature economizer water circulation assembly and an intelligent regulation and control assembly. Sensors are arranged at all key parts, an intelligent control unit is used for regulating and controlling a circulating water pump, a valve and other assemblies on the basis of a control model and real-time data, and the flue gas waste heat recovery amount is precisely regulated and controlled. Meanwhile, the system has the functions of data storage and analysis, fault diagnosis and interaction with external meteorological equipment, can optimize a control strategy, guarantees the system stability, and improves the adaptability. According to the system and method, the energy utilization efficiency is effectively improved, it is ensured that the system stably operates under complex working conditions, and the system and method have wide application prospects in the fields of thermal power generation and the like.

The invention relates to the technical field of heat pump air conditioning systems, and discloses an enthalpy increasing control method for a heat pump system, which comprises the following steps: under the condition of operating in an enthalpy increasing mode, acquiring a first target exhaust temperature and a suction superheat degree of a compressor and an economizer inlet and outlet state; under the condition that the inlet and outlet state of the economizer meets the enthalpy increasing onset condition, the opening degree of a main electronic expansion valve is adjusted according to the suction gas superheat degree so that the suction gas superheat degree can be within the suction gas superheat degree range; and the opening degree of the auxiliary electronic expansion valve is adjusted according to the first predicted exhaust temperature and the first target exhaust temperature so that the first predicted exhaust temperature can reach the first target exhaust temperature. The method can maximize the heating capacity of the heat pump system and ensure the operation stability of the heat pump system. The invention further discloses an enthalpy increasing control device for the heat pump system and the heat pump system.

The invention provides an intelligent sound wave soot blower control system based on a DCS, and the system comprises a sensor module which is used for collecting equipment operation parameters; the field control station is used for carrying out primary processing and caching on the equipment operation parameters acquired by the sensor; the data acquisition module is used for integrating and formatting the data; the distributed control module is used for establishing an optimal soot blowing simulation model and a dynamic adjustment model based on the physical characteristics of the equipment operation parameters, and is used for calculating ideal soot blowing information and a dynamic adjustment result determined based on the ideal soot blowing information; controlling the soot blowing action of the sound wave soot blower according to the dynamic adjustment result; the central monitoring station is used for feeding back the difference between the effects before and after soot blowing and optimizing and adjusting the dynamic adjustment model based on the difference; the invention aims at solving the problems of heat exchange efficiency reduction and resistance increase caused by ash deposition of the low-low-temperature economizer, improving the overall operation performance of the low-low-temperature economizer, prolonging the service life of equipment and achieving the purposes of energy conservation and environmental protection.

The invention relates to a heat pump system and a control method thereof, the heat pump system is provided with a liquid spraying enthalpy increasing branch, a refrigerant in a refrigerant circulation loop can be shunted between a first throttling element and a main path of an economizer, and the refrigerant flows into an air supplementing opening of a compressor through an auxiliary path of the economizer for air supplementing and enthalpy increasing. An air supply throttling element is arranged on the liquid spraying enthalpy increasing branch, and the controller obtains the exhaust superheat degree according to the exhaust temperature and the exhaust pressure, determines the optional adjusting mode of the opening degree of the air supply throttling element according to the exhaust superheat degree and obtains the superheat degree of the economizer according to the side road inlet temperature and the side road outlet temperature. According to the method, the target adjusting mode is determined from the selectable adjusting modes based on the superheat degree of the economizer, the opening degree of the air supply throttling element is controlled through the target adjusting mode, and the reliability of the compressor can be guaranteed while the exhaust temperature is reduced and the refrigerating and heating capacity is improved. And the heat exchange capacity of the economizer can be fully utilized, the refrigerant can be ensured to obtain sufficient supercooling degree, and the heat absorption capacity of the evaporator is improved.

The utility model discloses an economizer assembly and an air conditioning system. The economizer assembly comprises a heat exchanger, a main path inlet pipeline, a main path outlet pipeline, an auxiliary path inlet pipeline, an auxiliary path outlet pipeline and a throttling device, and a first flow channel and a second flow channel which are independent of each other are arranged in the heat exchanger; the main path inlet pipeline and the main path outlet pipeline are connected to a first liquid inlet and a liquid outlet of the heat exchanger respectively, one end of the auxiliary path inlet pipeline is communicated with the main path inlet pipeline, the other end of the auxiliary path inlet pipeline is connected with a second liquid inlet of the heat exchanger through the throttling device, and the auxiliary path outlet pipeline is connected with an air outlet of the heat exchanger. Based on the economizer assembly, the performance and reliability of the economizer are effectively improved, and the stability of the air conditioning system is enhanced.

The invention discloses a rapid monitoring and positioning method for a leakage point of a low-low-temperature economizer. The method comprises the steps that S1, a monitoring mechanism is arranged, wherein an infrared thermal imaging detection mechanism is arranged on the outer wall of the low-low-temperature economizer; a sonic sensor array is arranged around the low-low-temperature economizer; s2, data fusion analysis: fusing and analyzing infrared thermal imaging and sound wave detection data obtained from a monitoring mechanism; s3, anomaly detection: further analyzing and processing the fused data, and determining the position of a leakage point according to an analysis result; s4, performing strong positioning on the abnormal region or signal by using a phase difference positioning method, and finally determining a leakage point; and S5, when a leakage point is monitored, triggering an alarm signal, and generating a detailed leakage point position and leakage degree report. According to the invention, based on further analysis and research on existing technical problems, through combination of infrared thermal imaging and sound wave detection technologies, rapid and accurate monitoring and positioning of leakage points are realized.

The invention provides a low-temperature economizer water leakage on-line monitoring system in a flue gas deep waste heat recovery system, and relates to the technical field of flue gas low-temperature economizer water leakage detection, the system comprises a data management layer and a leakage monitoring layer, the data management layer comprises a main controller module and a central control module, the leakage monitoring layer comprises a plurality of groups of multi-channel control modules and liquid leakage sensing modules, the number of the liquid leakage sensing modules corresponds to the number of channels of the multi-channel control modules, and the plurality of groups of multi-channel control modules are connected with the main controller module; according to the invention, the liquid leakage sensing module in the form of the sensing belt is adopted, and the multi-channel control module is used for carrying out data integration on the liquid leakage sensing module, so that the device has the advantage of convenience in arrangement, is easy to install at key parts of equipment or a pipeline, does not occupy extra space, and further judges whether liquid leakage exists or not according to the change of current magnitude; and the sensitivity is good.

The invention discloses a grey wolf algorithm flue gas waste heat control method and system introducing exhaust gas temperature prediction constraint, and the method comprises the steps: firstly building a thermodynamic simulation model of a flue gas waste heat system, collecting the working condition data of a unit in real time, and calibrating the model; under the targets of power supply coal consumption minimization, waste heat recovery rate maximization and the like, an exhaust gas temperature prediction result is used as a dynamic constraint, a grey wolf optimization algorithm is adopted to carry out multi-target optimization on parameters such as the opening degree of a flue gas baffle, the water supply distribution proportion of an economizer and the water flow of an air heater, and multiple regression or a BP neural network model is utilized to predict the exhaust gas temperature. If the predicted value is lower than the safety lower limit, dynamically adjusting the search direction to avoid an infeasible solution; and an optimization result is issued on line through a DCS system, and closed-loop control is realized. Compared with the prior art, on the premise that the safety of the exhaust gas temperature is guaranteed, the waste heat utilization rate is remarkably increased, power supply coal consumption is reduced, the capacity of adapting to different coal qualities and load fluctuations in a self-learning mode is achieved, and the good engineering application prospect is achieved.

The utility model relates to the technical field of coke oven heating, in particular to an economical single-hole combustion chamber temperature adjusting device, which is characterized in that the input end of each heating gas unit I and the input end of each heating gas unit II are respectively connected with a heating gas main pipe; the output end of each first coal gas heating unit and the output end of each second coal gas heating unit are connected with the corresponding combustion chamber, one end of each adjusting unit is connected with the corresponding first coal gas heating unit, and the other end of each adjusting unit is connected with the corresponding second coal gas heating unit. The utility model has the advantages that the structure realizes the communication of the two heating gas main pipes, one regulating valve can be adopted to complete the flow regulation of the two gas heating pipes in the same combustion chamber, and the on-line maintenance and manual regulation are realized by changing the opening position of the T-shaped plug valve; the regulating valve is connected with the stop valve through the three-way connector, it is guaranteed that the regulating valve can be detached at any time when breaking down, and normal production is not affected.

The utility model discloses a circulating fluidized bed boiler furnace outlet horizontal flue ash removal device which comprises a furnace, a horizontal flue, a cyclone separator, a high-temperature superheater, a low-temperature superheater, a coal economizer and an ash removal device, one end of the ash removal device is arranged at the bottom of the horizontal flue, and the other end of the ash removal device is arranged at the lower end of the coal economizer. The ash removal device comprises a primary air pre-heater, a conveying air pipe, a conveying air branch pipe and an ash removal module, and the ash removal module is arranged at the bottom in the horizontal flue and comprises a main air pipe, a branch air pipe, a connecting rod and a small air cap. A small part of primary air is led to the bottom of the horizontal flue at the hearth outlet through the bypass pipeline of the primary air pre-heater and enters the ash removal device, accumulated ash accumulated at the horizontal flue at the hearth outlet is loosened and fluidized through the small air cap and then enters the cyclone separator along with flue gas, and therefore the purpose of removing the accumulated ash in the horizontal flue at the hearth outlet is achieved. After accumulated ash is cleaned, the smoke flow speed of a hearth outlet is reduced, and the efficiency of the boiler is improved.

The invention relates to the technical field of new energy automobile heat management, and belongs to a variable heat return quantity heat management system based on a new energy automobile R290 refrigerant, which can realize the functions of a refrigeration mode, a heat pump heating mode, a hot gas bypass mode and the like. The intermediate heat exchanger is used as a forced supercooling section and a heat regenerator of a water-cooling condenser in a refrigeration mode, and is used as an economizer in a heating mode; through the bypass ERV + EXV throttling mode, the refrigerant flow passing through the intermediate heat exchanger can be dynamically adjusted according to different compressor rotating speeds and suction superheat degrees, and the problem that the suction superheat degree is large when the intermediate heat exchanger is matched with different refrigerant flows is solved. The air suction superheat degree can be accurately adjusted, the COP is improved compared with a traditional system, and meanwhile the reliability of the compressor is guaranteed.

The utility model discloses a wide-channel plate type low-temperature economizer drainage device, and relates to the technical field of economizers. Comprising a water collecting tank arranged at the bottom of the economizer, the top face of the water collecting tank is fixedly connected and communicated with a plurality of water inlet assemblies, each water inlet assembly corresponds to and is communicated with one heat exchange plate, the center of the bottom of the water collecting tank is fixedly connected and communicated with a drainage pipe, and a first control valve is installed on the drainage pipe. The water collecting tank can be communicated with the bottoms of the heat exchange plates through the water inlet assembly, when the coal economizer is shut down, water in all the heat exchange plates installed in the coal economizer can be discharged by opening the first control valve, the water in heat exchange plate cavities can be discharged when the coal economizer is shut down, and the heat exchange plate cavities are prevented from being blocked. Water stored in the heat exchange plate cavity is effectively prevented from corroding the heat exchange plate cavity, and the service life of the economizer is effectively prolonged.

The invention provides an air-suspension variable-frequency centrifugal water chilling unit shutdown device and a control method. The shutdown device is installed on an air-suspension variable-frequency centrifugal water chilling unit system. The air-suspension variable-frequency centrifugal water chilling unit system comprises an evaporator, a compressor, a condenser, a first-stage throttling valve, an economizer, a second-stage throttling valve, a hot gas bypass valve and a shutdown valve, wherein the hot gas bypass valve is connected with the condenser and the evaporator, and the shutdown device comprises a compressor and a shutdown valve. The compressor has the beneficial effects that the pressure balance pipeline and the shutdown valve need to be arranged on the compressor, the shutdown valve is arranged at the proper position in the pressure balance pipeline, and the pressure balance pipeline is used for communicating the exhaust pipeline of the compressor with the air inlet pipeline; and high pressure in the exhaust pipeline is discharged to the low pressure side of the air inlet pipeline, so that permanent damage to a compressor bearing and a sealing system caused by back flushing of gas in the exhaust pipeline to the compressor is avoided, and the service life of the compressor is guaranteed.

The invention relates to a direct current furnace machine-furnace coordination system dynamic modeling method suitable for a wet condition. Based on the law of mass conservation and energy conservation, a lumped parameter method is adopted to construct a dynamic model comprising a coal pulverizing system, a coal economizer-water wall system, a water storage tank system, a superheater system and a steam turbine system; identifying parameters are optimized step by step by only utilizing unit variable load dynamic operation data and combining with the mechanism constraint that the heat absorption capacity of a working medium is monotonically increased along with the coal quantity as fired: static parameters are determined through dynamic data regression, nonlinear parameters are optimized based on a preset water-cooled wall outlet flow and dryness function structure, and the heat absorption capacity of the working medium is calculated. And finally, identifying dynamic parameters step by step by adopting an immune genetic algorithm. The dynamic characteristics and the physical consistency of the established model are verified through open-loop simulation, and the technical problems that dynamic description of the water level of the water storage tank is missing and the modeling precision is low under the wet working condition are solved.

The utility model discloses a boiler economizer heat exchange pipeline anti-abrasion device which comprises a heat exchange pipe, a V-shaped anti-abrasion plate is installed on the top of the heat exchange pipe, a plurality of heat exchange fins are installed on the heat exchange pipe and located below the V-shaped anti-abrasion plate, a plurality of installation holes are formed in the V-shaped anti-abrasion plate, the boiler economizer heat exchange pipeline anti-abrasion device further comprises a clamping and blocking strip, an elastic buckle is installed at the bottom of the clamping and blocking strip, and the clamping and blocking strip is connected with the V-shaped anti-abrasion plate. And the elastic buckle is clamped in the mounting hole. The V-shaped anti-abrasion plate is additionally arranged at the top of the heat exchange tube, so that the top of the heat exchange tube is prevented from being impacted and abraded by flue gas and is prevented from being damaged; a plurality of blocking strips are mounted on the V-shaped anti-abrasion plate, so that dust is accumulated on the surface of the V-shaped anti-abrasion plate, the purpose of abrading materials by the materials is achieved, and the loss of the V-shaped anti-abrasion plate is reduced; the clamping strip is mounted at the mounting hole through the elastic buckle, and the inclined block in the elastic buckle is pushed out through the abutting block, so that after the clamping strip is damaged, the inclined block can continuously stop smoke, and the elastic buckle can be continuously pressed downwards to fall off to be replaced with a new clamping strip.

The invention discloses an energy-saving temperature and humidity decoupling control cold and hot dual-function air conditioning system and a control method thereof, and belongs to the technical field of air conditioning, the system comprises a precise air conditioning system, an air handling unit and a control unit, the control unit is connected with the precise air conditioning system and the air handling unit, and the precise air conditioning system is connected with the air handling unit. The control method comprises the following steps that S1, the air conditioning system switches operation modes; s2, adjusting parallel air ducts of the air conditioning system through the air valve matrix; s3, the decoupling economizer carries out decoupling control; s4, any one of five working conditions of pure refrigeration regulation, low-temperature and constant-humidity regulation, medium-temperature and constant-humidity regulation, high-temperature and constant-humidity regulation and pure heat supply regulation is operated; and S5, the air handling unit is controlled to execute air volume adjustment, air filtration, surface cooling and reheating. The system can meet various complex air treatment requirements of a user, and has a wide temperature and humidity application range and precise temperature and humidity regulation and control precision.