392 results about "Boiler feedwater" patented technology

The invention relates to the technical field of control regulation, in particular to a supercritical unit variable load rate dynamic compensation control method, which comprises the following steps: acquiring unit operation data, performing credibility restoration, and outputting a credible parameter set; a time sequence mapping table is constructed based on the credible data, and boiler heat storage lag time, steam turbine control valve delay and a steam temperature interstage coupling coefficient are quantified; correcting the boiler water supply feedforward instruction by using the heat storage lag time to generate a compensated water supply instruction; according to the time sequence mapping table and the main steam pressure change rate, a multi-genetic algorithm is adopted to optimize a control valve constraint rule, and a dynamically constrained control valve action instruction is generated; an inter-stage coupling coefficient is called to generate a swing angle compensation amount, and water spraying temperature reduction disturbance is blocked; safety locking parameters are monitored to trigger buffering intervention in a grading mode, and compensation instructions are integrated to implement cooperative correction. The problem of out-of-step response of multiple execution units under the variable load working condition is solved, and the unit adjusting rate and the control stability are remarkably optimized.

The utility model relates to the field of industrial boiler equipment, in particular to an automatic chemical feeding device for a boiler, which comprises a chemical feeding tank and the boiler, the chemical feeding tank and the boiler are connected through a boiler water supply pipeline, the top of the chemical feeding tank is provided with a water feeding port and a chemical feeding port, the water feeding port is connected with an external water supply pipeline, and the chemical feeding port is connected with an external chemical supply pipeline. A first electromagnetic valve is arranged on the water adding opening, a second electromagnetic valve is arranged on the medicine adding opening, a liquid level meter is installed on the outer side face of the medicine adding tank, a metering pump is arranged on a water supply pipeline of the boiler, a water quality monitor is arranged on the inner wall of the boiler, and the system further comprises a controller which is electrically connected with the first electromagnetic valve, the second electromagnetic valve, the liquid level meter, the metering pump and the water quality monitor. The utility model provides an automatic boiler dosing device which solves the problems that an existing boiler dosing device is low in operation efficiency, high in safety risk and high in maintenance cost.

The invention discloses a power plant boiler feed water automatic dosing device, and relates to the field of dosing devices.The power plant boiler feed water automatic dosing device comprises a stirring barrel, a feeding hopper is arranged on the top face of the stirring barrel, and a PLC is arranged on the outer circle wall face of the stirring barrel; through mutual cooperative use of a stirring barrel, a cover plate, a preliminary mixing bin, a first fixing hole, a first connecting pipe, a rotating mixing barrel and a bearing, the effect of dissolving medicine powder can be achieved, caked medicine powder can fall off through a feeding hopper with the side wall almost perpendicular to the side wall, medicine blocks are crushed into small blocks through rotation of a micro auger, and the medicine powder is more uniform. The medicine powder is continuously turned over in the rotary mixing barrel, the caking condition is further eliminated, meanwhile, water is added into the medicine powder, the medicine powder is turned over to make full contact with the water, heating is matched, the dissolving speed is higher, the dissolving effect is better, then the medicine powder is added into the water in the stirring barrel, and the situation that precipitation occurs due to the fact that the medicine powder is not dissolved in time is avoided; and meanwhile, the dissolving effect is ensured, and the device is relatively practical.

The invention relates to a method and device for evaluating the rapid load changing capacity of a coal-fired unit, and the method comprises the steps: firstly, building a coal-fired unit dynamic model which comprises a coal pulverizing system, a boiler and a steam turbine through historical operation data, and determining model parameters based on the operation characteristics of an actual unit; secondly, main steam pressure and power instructions of different load sections are set according to the sliding pressure curve, a variable load capacity test is carried out by adopting a method of increasing the load increasing rate, and meanwhile, the coal feeding amount, the boiler water feeding amount and the adjusting range and the changing rate of a main steam valve are restrained; finally, dynamic changes of key parameters such as main steam pressure and steam-water separator outlet temperature in the variable load process are analyzed, and the actual average load rising rate of the unit is evaluated. According to the invention, the variable load capability of the unit in different load intervals can be accurately evaluated. Therefore, the problems that in the prior art, the load changing capacity of a unit in different load intervals is difficult to accurately evaluate, and the stabilization of new energy power generation fluctuation and the stability of power grid frequency are greatly influenced are solved.

The invention discloses a fuming furnace waste heat boiler liquid level automatic control device, method and system and a medium, and the method comprises the steps that sensing data are obtained and preprocessed, and the sensing data at least comprise steam drum liquid level data, steam output flow data and boiler feed water flow data; performing three-impulse cascade PID control based on the sensing data to obtain a control instruction, wherein the control instruction comprises a theoretical water replenishing value, a valve opening instruction and a water pump frequency converter adjusting instruction; regulating valve control and constant pressure difference control are carried out based on the control instruction in combination with a preset interval; and performing synchronous control based on a preset safety interlocking protection mechanism, wherein the synchronous control comprises pump spare power automatic switching, regulating valve abnormity alarm, over-limit water level interlocking and man-machine interaction. Through innovative three-impulse cascade PI D, dynamic interval control and constant pressure difference optimization, the defects of a traditional method under the complex working condition of the fuming furnace are overcome, high-precision and high-stability liquid level control is achieved, and meanwhile equipment safety and economical efficiency are remarkably improved.

The invention discloses a double-turbine power generation device suitable for a thermal power generating unit, relates to the technical field of thermal power generation, and mainly aims to improve the power generation efficiency of the thermal power generating unit. According to the main technical scheme, a boiler system is connected with steam inlet valves of a first steam turbine power generation sub-set and a second steam turbine power generation sub-set through pipelines, and corresponding steam is conveyed to the two sub-sets by adjusting the opening degree of a valve to be matched with a load distribution target. After the two subsets do work, part of steam is fed into a steam extraction heat regeneration system to recover heat and is used for heating boiler feed water; and the residual exhaust steam enters the condenser system to be condensed into water, and the condensed water is conveyed to the steam extraction heat regeneration system to be heated to become boiler feed water, so that circulating power generation is realized.

The invention discloses an RBF-PID (Radial Basis Function-Proportion Integration Differentiation)-based intelligent dosing method and system for boiler feed water. The method comprises the following steps: collecting information; an RBF neural network model is established, the RBF neural network model is optimized based on a gradient descent algorithm to set PID controller parameters online, an RBF-PID control signal is output, a feedforward model is established, collected information is substituted into the feedforward model, and a feedforward control signal is output; the RBF-PID control signal and the feedforward control signal are superposed to obtain a master control signal; the dosing control unit receives a master control signal to adjust the frequency of an ammonia adding pump to complete dosing; according to the invention, the online learning capability of the RBF neural network is fully utilized to self-tune the PID parameters, the PID control response speed is improved, and in combination with the feedforward model based on feed water flow change, the dosing requirement of rapid load change can be met.

The utility model provides a system for directly recycling wastewater of a medium-high pressure boiler. The system comprises a collecting and regulating tank, a heat exchanger, a coagulation clarifier, a multi-medium filter, an ultrafiltration system, a secondary reverse osmosis system, an EDI (Electronic Data Interchange) device, a mixed bed and a user high-purity water tank which are connected in sequence, the second-stage reverse osmosis system comprises a first-stage reverse osmosis system and a second-stage reverse osmosis system, the first-stage reverse osmosis system comprises a first-stage RO raw water tank, a precision filter and a first-stage RO device, effluent of the ultrafiltration system enters the first-stage RO raw water tank and then enters the precision filter to be filtered, and water produced by the precision filter is fed into the first-stage RO device; the second-stage reverse osmosis system comprises a second-stage RO raw water tank and a second-stage RO device, fresh water produced by the first-stage RO device is fed into the second-stage RO raw water tank and then enters the second-stage RO device, and fresh water produced by the second-stage RO device is fed into the EDI device to be treated. According to the utility model, a full-flow treatment system is developed aiming at the water quality condition of the wastewater of the medium-high pressure boiler, and the finished water can stably meet the water supply requirements of the medium-high pressure boiler.

The invention discloses an automatic boiler dosing method based on response surface modeling-PID coupling control, and relates to the field of thermal power boiler feed water treatment, and the method comprises the steps: collecting historical operation data, and employing a Pearson correlation coefficient method to screen out the correlation between the frequency of a boiler dosing pump and each parameter index; bBD design is carried out through response surface analysis, response values and factors in the dosing process are determined, and three different levels are selected for the factors; establishing a mathematical model between the response value and each factor through model fitting; setting a target value, substituting the target value into the response surface model for calculation, and taking the calculated value as a feedforward input quantity of a PID controller of the boiler dosing system; setting the deviation between the target value and the feedback value to obtain the adjusting frequency of dosing; and obtaining the final frequency of the ammonia adding pump by adopting a weighted average algorithm. According to the method, a mathematical model is constructed, an algorithm model and control logic are fused, and real-time response and control optimization of the boiler dosing control process are achieved.

The invention discloses an implementation method of a single auxiliary machine steam pump RB of a circulating fluidized bed unit, which comprises the following steps: after the steam pump trips, the action condition of the steam pump RB: opening a front electric door and a rear electric door of a boiler water supply bypass adjusting door when the RB acts; when the RB acts, the current of the electric pump is 200A and the outlet pressure of the electric pump is more than 20MPa, an outlet regulating valve of the electric pump is opened to 35%; coordinating to a turbine following TF mode, and forcibly switching a unit operation mode to a sliding pressure mode; after RB occurs, AGC is automatically cut off, meanwhile, an instruction is sent to a DEH system, and a sequence valve is cut into a single valve; and when the load of the unit is reduced to the target load for 3 seconds or the operator presses down a steam pump RB ending button, the RB process is ended. The system has the advantages that after the single steam pump trips, the unit load is changed to the target load without manual intervention of an operator, so that the operation intensity of the operator in an accident state is greatly reduced, and the probability of misoperation of the operator is reduced; the load range of a boiler BT is increased from 80MW to 160MW when a steam pump trips out, so that a larger safe and stable operation space is provided for a unit; bT accidents are avoided, and the purpose of saving coal consumption is achieved.

The invention provides a treatment method and system for directly recycling wastewater of a medium-high pressure boiler, and the method comprises the following steps: the wastewater of the medium-high pressure boiler enters a collecting and regulating tank after being discharged, and then is fed into a heat exchanger through a booster pump; the treated wastewater enters a coagulation clarifier through system residual pressure, floc is formed, and effluent is clarified; feeding clarified effluent into a multi-medium filter through a booster pump; water produced by the multi-medium filter is fed into an ultrafiltration system; effluent of the ultrafiltration system enters a secondary reverse osmosis system, and fresh water produced by the secondary reverse osmosis system is fed into an EDI device through a booster pump to be treated; and pure water produced by the EDI device enters the mixed bed through system residual pressure, is subjected to fine desalination through ion exchange, and then is fed into a high-purity water tank of a user to be used as inlet water of a middle-high pressure boiler. The invention develops a full-flow treatment process aiming at the special water quality condition of the wastewater of the medium-high pressure boiler, and the finished water can stably meet the strict water quality requirement of the water supplied by the medium-high pressure boiler.

The invention discloses a quantitative analysis method for frequency static stability of a power system. The quantitative analysis method comprises the following steps: acquiring data information of a target power system; performing refined modeling on the thermal power generating unit in the target power system; dynamically analyzing the change trend of the unit load, the water supply quantity and the fuel quantity of the target power system; obtaining a system static power frequency characteristic curve of the target power system when the frequency deviation is greater than a set range; and performing quantitative analysis of frequency static stability on the target power system. The invention also discloses a system for realizing the quantitative analysis method for static stability of the frequency of the power system. According to the method, through fine modeling, variation trend analysis, system static power frequency characteristic curve calculation and corresponding analysis of the thermal power generating unit, quantitative analysis of static stability of the frequency of the power system is realized on the basis of considering physical, control and protection processes of a boiler water supply system of the thermal power generating unit, and the reliability is higher; and the accuracy is better.

The utility model provides a dry quenching circulating gas supply and waste heat utilization system which comprises a circulating gas supply mechanism and a waste heat utilization mechanism, the circulating gas supply mechanism comprises a circulating gas outlet pipe, a circulating gas inlet pipe and a circulating gas pipeline, the circulating gas outlet pipe is connected with a primary dust remover, and the circulating gas inlet pipe is provided with a secondary dust remover and a circulating fan; the waste heat utilization mechanism comprises a dry quenching boiler, a heat pipe heat exchanger and a deaerator, the dry quenching boiler is connected between the circulating gas outlet pipe and the circulating gas pipeline, the heat pipe heat exchanger is connected with a circulating fan, a water inlet of the heat pipe heat exchanger is connected with a desalting cold water pipe, and a water outlet of the heat pipe heat exchanger is connected with the deaerator through a desalting hot water pipe; and the deaerator is connected with a water inlet of the dry quenching boiler through a boiler water supply pipe. According to the device, the circulating gas is purified, combusted, cooled, subjected to heat exchange and the like through the annular circulating gas channel and the dry quenching boiler, it is guaranteed that a system for circularly supplying gas to the dry quenching boiler operates safely and stably, meanwhile, waste heat in the circulating gas is recycled, and energy is saved.

The invention relates to the technical field of energy conservation and environmental protection, and provides a zero-steam-consumption boiler feed water waste heat utilization system, which comprises a vacuum gas stripping deoxidization unit, a steam stripping deoxidization unit and a steam stripping deoxidization unit, deoxygenated water pipelines of a first heat exchange section and a second heat exchange section of the multi-stream heat exchanger are communicated, and heat source pipelines are independent; a water outlet of the vacuum gas stripping deoxygenization unit is connected with a deoxygenization water output port through a deoxygenization water pipeline of the multi-stream heat exchanger and a deoxygenization water pipeline of the working medium heat exchanger in sequence; one end of a heat source pipeline of the working medium evaporator is connected with a heat source water inlet, the other end of the heat source pipeline is connected with a heat source water return port through a heat source pipeline of the first heat exchange section, the heat source water inlet is further connected with the heat source water return port through a heat source pipeline of the second heat exchange section, and a second working medium pipeline of the working medium evaporator and a first working medium pipeline of the working medium heat exchanger form circulation. According to the invention, the dissolved oxygen index of the deoxygenated water can be ensured to be qualified, the operation energy consumption is reduced, the temperature index of the deoxygenated water is ensured to be qualified, and finally qualified boiler feed water is produced.

The invention discloses a rapid peak and frequency regulation system and method for a coal-fired unit with a regenerative system coupled with high-temperature working medium for heat storage, and relates to the technical field of conventional heating power and electricity technologies and energy storage, and the rapid peak and frequency regulation system comprises a coal-fired unit thermodynamic cycle system and a high-temperature working medium heat storage system, the high-temperature working medium heat storage system is deeply coupled with a thermodynamic cycle heat regeneration system of the coal-fired unit, and rapid combined peak regulation and frequency modulation of the unit are achieved by reducing the steam extraction amount of each stage of a steam turbine and cooperating with energy supply of the high-temperature working medium heat storage system. Firstly, when the unit needs to rapidly increase the load, rapid increase of the power generation output of the unit is achieved by reducing the steam extraction amount of each stage of a steam turbine, and meanwhile, high-temperature and high-pressure saturated water stored in a high-temperature working medium heat storage tank generates a certain amount of saturated steam through pressure reduction to replace steam extraction of each stage of the steam turbine to heat boiler feed water in a regenerative system; therefore, the water supply temperature of the boiler is kept unchanged or increased, and the variable load response capability of the coal-fired unit is quickly improved.

The invention relates to the field of deoxidizers, in particular to a deoxidizer for auxiliary deoxidization of boiler feed water as well as a preparation method and application of the deoxidizer. The deoxidant is prepared from the following components: 0.3 percent to 0.5 percent of sodium sulfite, 0.1 percent to 0.3 percent of benzotriazole, 0.1 percent to 0.2 percent of vitamin C, 0.05 percent to 0.1 percent of polyethylene glycol, 0.1 percent to 0.2 percent of acetoxime, 0.1 percent to 0.2 percent of malic acid and the balance of de-softened water. The deoxidant disclosed by the invention shows an excellent deoxidizing effect in a boiler feed water treatment process, has good corrosion inhibition performance, and can effectively keep a system clean and prolong the service life of equipment.

The invention relates to the technical field of waste heat recovery, and particularly discloses a waste heat recovery device of a steam boiler, the waste heat recovery device comprises a boiler body, the top of the boiler body is provided with a flue pipe, a fixed pipe, a heat recovery assembly and a discharge pipe, and the flue pipe is fixedly communicated with the top of the boiler body; flue gas enters the chimney through the flue pipe and the fixed pipe and then exchanges heat with the multiple sets of heat conducting plates, and heat is transmitted to runners of the chimney and the movable cylinder and runners of the movable cylinder and the fixed cylinder through the heat conducting plates to heat combustion air introduced into the runners of the fixed cylinder and the movable cylinder through the air inlet pipe. The boiler feed water is introduced into a movable barrel and a smoke barrel flow channel through a water inlet pipe, contact between smoke and the plate face can be enhanced through rotation of a heat conduction plate, the heat transfer area is increased, the waste heat recovery efficiency is improved, and heat loss is reduced; meanwhile, the air flow channel is arranged on the outer side of the water flow channel, heat dissipated in the water flow heating process can be reutilized, and the waste heat utilization efficiency and the recovery effect are further improved.

The application provides a coupling system and a control method for improving the variable load rate of a secondary reheat unit integrated with a medium-temperature energy storage, wherein the medium-temperature energy storage system is connected with the high-pressure cylinder outlet through a high-pressure cylinder outlet steam extraction valve during the energy storage process, is connected with the deaerator outlet through a pressure relief valve, is connected with the feed water pump outlet through a deaerator outlet regulating valve during the energy release process, and is connected with the boiler feed water inlet through a pipeline, so as to form a secondary reheat unit integrated with the medium-temperature energy storage; and a load splitting method is provided, which splits the whole unit load instruction into a medium-temperature energy storage system load instruction and a secondary reheat unit boiler coordination system load instruction, and the medium-temperature energy storage system load instruction is realized through high-pressure cylinder exhaust valve opening degree control and deaerator outlet regulating valve opening degree control in the load decreasing and increasing processes; through the coupling system and the load splitting method, the time-space transfer of the unit energy in the variable load process is realized, the variable load rate of the secondary reheat unit is improved, and the flexibility of the unit is enhanced.

This invention provides a boiler system that can effectively utilize the heat contained in ammonia decomposition gas. Furthermore, it provides a boiler system that can maintain the temperature of the ammonia decomposition gas at the boiler inlet within a predetermined temperature range. [Solution] The boiler system comprises an ammonia decomposition device that decomposes ammonia to produce ammonia decomposition gas containing hydrogen and nitrogen, a boiler that burns the ammonia decomposition gas as fuel, an ammonia decomposition gas supply line that supplies the ammonia decomposition gas from the ammonia decomposition device to the boiler, a feedwater line that supplies feedwater to the boiler, and a heat exchanger that heats the feedwater by exchanging heat between the ammonia decomposition gas and the feedwater.

The utility model discloses a boiler feed water treatment device which comprises a hollow fiber membrane pipe, a vacuum connector and shells detachably installed at the two ends of the vacuum connector, a water inlet pipe is installed at the position of the shell on one side, and a water outlet pipe is installed at the position of the shell on the other side. The shell moves in the axial direction of the water inlet pipe and the water outlet pipe. The hollow fiber membrane tubes are mounted on the two end surfaces of the vacuum connector and located in the shell, and a water passing tube group is mounted through the vacuum connector; according to the device, the hollow fiber membrane tube can be directly exposed through transverse movement of the shell, so that the hollow fiber membrane tube can be conveniently maintained or replaced, and relatively convenience is provided.

An apparatus for steam reforming includes a reactor, a condensate separator, a condensate stripper, and a steam boiler. The reactor produces hydrogen and is connected to the condensate separator such that a gas mixture is conducted from the reactor into the condensate separator. The condensate separator and the condensate stripper are connected so that condensate separated out in the condensate separator is conducted into the condensate stripper. The condensate separator and the steam boiler are connected such that cleaned condensate can be conducted into the steam boiler. The steam boiler is connected to the reactor and to the condensate stripper in a steam-conducting manner. The boiler water feed line of the steam boiler is connectable to the condensate stripper in a liquid-conducting manner. A supply from the boiler water feed line is at a same location of the condensate stripper as a supply of the condensate from the condensate separator.

The present invention relates to a desuperheating water system for superheaters and reheaters of a new type of million-ton tower boiler. At present, in order to ensure the wall temperature safety of the reheater system, the desuperheating water of the reheater is often put into use, and the input of the desuperheating water of the reheater will reduce the efficiency of the boiler, thus ultimately affecting the coal consumption of the unit and increasing the operation cost of the power plant. A desuperheating water system for superheaters and reheaters of a new type of million-ton tower boiler includes: a feed water pump (1), the feed water pump is connected to a group of high-temperature heaters (2), the group of high-temperature heaters are connected in series on the pipeline of the feed water pump, the group of high-temperature heaters are connected to the boiler feed water system, a superheater desuperheating water main pipe (3) is connected between the boiler feed water system and the group of high-temperature heaters, and the superheater desuperheating water main pipe is connected to a primary desuperheating water branch (11) and a secondary desuperheating water branch (12). The present invention is applied to the field of boilers.

The invention provides a supercritical circulating fluidized bed unit dry and wet state automatic conversion and whole-course water supply control system and method, and belongs to the technical field of automatic control. The problems of low automatic input rate, complex and difficult wet state control strategy, large dry and wet state conversion disturbance, load control breakpoints and the like in once-through boiler feed water control in the deep peak regulation coordinated variable load process of the unit are solved; the main steam flow is corrected by introducing the enthalpy value of the last-stage superheater and the enthalpy value of the outlet of the separator on the basis of a self-balancing water supply control strategy, the heat released / absorbed by the boiler is dynamically reflected, the balance of the heat load and the evaporation capacity of the boiler is guaranteed, and meanwhile the boiler bed temperature and the wall temperature of a certain area of the boiler are corrected in real time; according to the method, the same set of control strategy is adopted for water supply control in the dry state and the wet state of the boiler, and switching and transformation of water supply control modes are not needed. Meanwhile, power control and dry-wet state conversion control are combined, and continuous power control in the dry-wet state conversion process is achieved.

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.

The invention discloses a system and method for recycling high-temperature condensate from ethylene glycol synthesis, comprising the following steps: S1, dividing the steam condensate generated by the ethylene glycol synthesis system into two parts, one part preheating the dimethyl oxalate from the dimethyl oxalate buffer tank to a first temperature, and the other part preheating the boiler feed water to a second temperature; S2, transporting the steam condensate after preheating the dimethyl oxalate and the boiler feed water to the condensate main pipe. In the present invention, the steam condensate generated by synthesizing ethylene glycol is used to preheat the dimethyl oxalate and the boiler feed water, which, on the one hand, reduces the use of high-grade steam when 3.5MpaG steam is used to preheat the dimethyl oxalate and the boiler feed water in the prior art, increases the amount of byproducts of 0.8MPa steam, and achieves the purpose of recovering high-grade latent heat from low-grade sensible heat; on the other hand, the heat of the steam condensate is recovered in the form of material heat exchange, and the temperature of the condensate can be finally reduced, and all the heat is recovered, which is superior to the market ORC and condensate refrigeration technology, and has low investment costs and high investment returns.

The utility model discloses an energy-saving device for hazardous waste incineration flue gas treatment, which comprises a hazardous waste treatment system and an energy circulation system which are matched with each other, and the hazardous waste treatment system comprises a rotary kiln (1), a secondary combustion chamber (2), a waste heat boiler (3) and a dry deacidification and bag-type dust collector (4), the energy circulation system comprises a flue gas heat collector (5), a wet slag drying system (6), a primary air heater (7), a secondary air heater (8) and a boiler feed water heater (9); an outlet of the bag-type dust collector (4) is connected with the flue gas heat collector (5), a waterway outlet (5a) of the flue gas heat collector (5) is respectively connected with the wet slag drying system (6), the primary air heater (7), the secondary air heater (8) and the boiler feed water heater (9) through four branches, and return water is connected with the flue gas heat collector (5) through a circulating pipe (24). The waste heat recycling device has the advantages that waste heat generated by hazardous waste incineration is effectively recycled, and the hazardous waste disposal cost is reduced.

The utility model provides a multi-container stepped water supply device which comprises a concentration tank, a water storage chamber, a connecting pipe, a buoyancy valve assembly, a water inlet pipe and a water outlet pipe. A plurality of water storage chambers are arranged, and the communication of every two adjacent water storage chambers is controlled by the buoyancy valve assembly; therefore, direct heat exchange among various kinds of water is prevented, and the temperature of water supplied to the boiler is prevented from being affected. Energy for boiler heating is reduced, and energy consumption is reduced.

The embodiment of the invention provides a coupled double-tank active solar photo-thermal boiler complementary five-stage steam supply system. The coupled double-tank active solar photo-thermal boiler complementary five-stage steam supply system comprises a coal-fired power generation unit and a water supply regenerative system, wherein the coal-fired power generation unit comprises a boiler, a steam turbine high-pressure cylinder, a reheater, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder which are connected in sequence; the tower type solar photo-thermal system comprises a low-temperature molten salt tank, a solar heat collection tower and a high-temperature molten salt tank which are connected through a molten salt pump and a pipeline; an outlet of the high-temperature molten salt tank is sequentially connected with hot-side molten salt inlets of the main heat exchanger and the second-stage heat exchanger through a molten salt pump, and a cold-side molten salt outlet of the second-stage heat exchanger is connected to the low-temperature molten salt tank; a water supply inlet of the main heat exchanger is connected with a boiler water supply pipeline, and a steam outlet is connected to a boiler main steam system; a feed water inlet of the second-stage heat exchanger is connected with an outlet of a pressurizing water pump, an inlet of the pressurizing water pump is connected to a condensed water pipeline of an outlet of the deaerator, and a steam outlet of the second-stage heat exchanger is used for providing industrial steam supply of a first pressure grade.

The present invention provides a self-coupling system for utilizing low-grade waste heat from a gas-fired steam boiler, comprising a water tank, a flue gas energy-saving heat exchanger, a deaerator, an electric heat pump device, a gas-fired steam boiler, and a spray heat exchanger. The water tank is used to inject softened water into the system. The exhaust gas from the gas-fired steam boiler sequentially heats the softened water and intermediate water. The heated softened water enters the deaerator and then enters the gas-fired steam boiler's water supply system. The intermediate water is heated by heat exchange in the spray heat exchanger, then passes through an intermediate water inlet pipe into the electric heat pump device to release heat and cool down. The self-coupling system for utilizing low-grade waste heat from a gas-fired steam boiler, without changing the existing water supply system, utilizes low-grade waste heat self-coupling technology to achieve efficient heat exchange between flue gas and intermediate water, fully reducing flue gas temperature and gradually increasing boiler feed water temperature. Simultaneously, secondary recovery of flue gas waste heat provides heat replenishment and capacity expansion, reducing boiler gas consumption.