1260results about "Combustion process" patented technology

The present invention discloses a hot-end sealing device for an air preheater that compensates for the expansion difference between a sealing sheet and a backing plate, which at least includes a sealing sheet and a backing plate. The sealing sheet is provided with sealing sheet mounting holes distributed along the length direction, and the backing plate is provided with backing plate mounting holes distributed along the length direction. The linear expansion coefficient of the sealing sheet is different from that of the backing plate. The sealing sheet and the backing plate are relatively fixed by clamping bolts that simultaneously pass through the sealing sheet mounting holes and the backing plate mounting holes. One end close to the rotor central cylinder is the expansion starting end, and the clamping bolts at the expansion starting end are fully tightened and fixed, while the remaining clamping bolts are not fully tightened and fixed, so that the sealing sheet and the backing plate freely expand towards the other end close to the rotor outer edge angle steel after being heated. At least one set of two-dimensional guiding mechanisms is arranged between the sealing sheet and the backing plate downstream of the expansion starting end. The above device maximally compensates for the triangular air leakage area at the hot end of the air preheater, significantly reduces the air leakage rate of the air preheater, has good stability and a long service life.

The invention relates to the technical field of thermal equipment operation state dynamic test and compensation control, in particular to an AI-based boiler air pre-heater temperature uniformity regulation and control system, which comprises a collaborative closed-loop control network of a data acquisition module, an AI prediction module, a heat storage system control module, a temperature compensation control module and a thermal stress analysis module. The data acquisition module acquires flue gas temperature, coal quality parameters and load instructions in real time, the flue gas temperature, the coal quality parameters and the load instructions are transmitted to the AI prediction module through an industrial bus, XGBoost, LightGBM and a deep neural network model are used for carrying out spatial-temporal feature extraction on the evolution trend of a temperature field, and the heat storage system control module dynamically switches heat storage and release modes according to the load state. The heat distribution proportion among the multiple units is adjusted by combining the three-dimensional stress field distribution data of the thermal stress analysis module; the bottleneck of lack of thermal inertia regulation of an existing system is broken through, dynamic balance of a temperature field under the condition that thermal stress of a heat transfer element is controllable is achieved, and the heat exchange efficiency and operation stability of the air pre-heater are improved.

A bearing system includes a housing having an inner surface defining a bore and a slot, and a foil bearing assembly positioned within the bore. The foil bearing assembly includes an outer foil assembly, a bump foil assembly, and an inner foil assembly. The outer foil assembly includes an outer foil extending from a first outer foil end to a second outer foil end, and a first anti-rotation tab at the first outer foil end that is received by the slot to limit circumferential movement of the outer foil in a first direction. The inner foil assembly is secured to the outer foil and includes an inner foil extending from a first inner foil end to a second inner foil end, and a second anti-rotation tab at the second inner foil end that is received by the slot to limit circumferential movement of the inner foil in a second direction.

A solar tracker bearing apparatus mountable to an upright support post for rotatably supporting a torque tube beam of a solar tracker assembly and including: a rotatable bearing assembly supported for rotation about an axis of rotation by a stationary saddle assembly. The rotatable bearing assembly includes a central portion and first and second spaced apart arcuate peripheral portions, the central portion defining a beam slot, the first arcuate peripheral portion including a first arcuate rim bearing and the second arcuate peripheral portion including a second arcuate rim bearing, and the first and second rim bearings being spaced apart in a direction parallel to the axis of rotation of the rotatable bearing assembly. The stationary saddle assembly includes a first arcuate bearing race slidably supporting the first arcuate rim bearing and a spaced apart second arcuate bearing race slidably supporting the second arcuate rim bearing.

Methods, systems, devices, and products for use in a pole support system. Apparatus include a hinge joint comprising: a base having an insertion end with a longitudinal slot and with a fulcrum protrusion on an inner surface; a cup having a receiving end selectively receiving the insertion end of the base; a securing assembly configured to selectively release the cup from the base, the securing assembly comprising a rotatable shaft that translates along the longitudinal slot between at least i) a lower relative position corresponding to an engaged state in which the insertion end is received by the receiving end, and ii) an upper relative position corresponding to a released state in which the insertion end is free of the receiving end; the shaft having a cam projection positioned to contact against the fulcrum protrusion and displace the shaft toward the upper relative position when the shaft is rotated.

A magnetic bearing system (100) includes a rotary shaft (101) and a magnetic bearing (105, 107, 130) having an electromagnet coil (106, 108, 108B, 135, 136). One end of the electromagnet coil (106, 108, 108B, 135, 136) is connected to the neutral point of a first multi-phase winding (113, 115, 123, 125, 173, 181) having at least three or more phases.

The invention discloses an intelligent control method and system for preventing blockage of an air preheater, and the method comprises the steps: determining the flue gas flow difference data of the front and rear sides of the air preheater, evaluating the blockage condition of the air preheater to obtain a blockage evaluation value, and setting the initial working condition of a blowing device according to the blockage evaluation value; acquiring flue gas temperature data and flue gas flow data of the front side of the air preheater, and determining a flue gas temperature coefficient and a flue gas flow coefficient through analysis; and a regulation and control coefficient is determined based on the flue gas temperature coefficient and the flue gas flow coefficient, and after the initial working condition of the air blowing device is adjusted, the air blowing device is controlled to conduct anti-blocking air blowing on the air preheater. By monitoring the flue gas flow difference data in real time, analyzing the flue gas temperature and flow data and combining an intelligent algorithm and a control strategy, intelligent anti-blocking control over the air preheater can be achieved in time, stable operation of equipment is ensured, the service life of the equipment is prolonged, the maintenance cost is reduced, and the production efficiency is improved.

The invention relates to the technical field of environment-friendly equipment, in particular to an efficient energy-saving type waste gas treatment system and process for a biomass and garbage boiler, and the treatment system comprises an air preheater, a dry desulphurization device, a dust remover, a low-temperature denitration device, a heat exchanger and a chimney which are sequentially connected at an outlet of the boiler. An inlet and an outlet of a first heat exchange channel of the heat exchanger are connected with a low-temperature denitration device and a chimney respectively, and an inlet and an outlet of a second heat exchange channel of the heat exchanger are connected with air and an air preheater respectively. Therefore, the temperature of waste gas in desulfurization, dust removal and denitration links is increased, and finally heat energy is recycled by the heat exchanger. The process is free of additional energy supplement, the emission temperature is reduced, the heat energy loss is less, the advantages of energy conservation and emission reduction are achieved, the denitration reaction temperature is increased, and the denitration efficiency is improved.

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.

A compressor assembly is provided and includes a fluid pathway, a compressor disposed and configured to compress fluid flowing along the fluid pathway and a motor configured to drive operations of the compressor. The motor includes one or more hybrid airfoil bearings to support the shaft within a housing. Each of the one or more hybrid airfoil bearings includes airfoil bearing components including a top foil immediately surrounding the shaft and additional components and passive magnetic bearing components integrated into the shaft and the additional components of the airfoil bearing components to remove a static load of the shaft on the top foil.

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.

A hybrid airfoil thrust bearing is provided for a shaft including a thrust disc that rotates with the shaft. The hybrid airfoil thrust bearing includes airfoil bearing components and passive magnetic bearing components. The hybrid airfoil bearing components include a first top foil immediately adjacent to a first side of the thrust disc and surrounding the shaft, first additional components, a second top foil immediately adjacent to a second side of the thrust disc and surrounding the shaft and second additional components. The passive magnetic bearing components are integrated into the thrust disc and into the first and second additional components to remove a static load of the thrust disc on the first top foil and on the second top foil.

The invention provides an electro / thermochemical gradient hydrogen production system and method for solar radiation energy grading and residual light energy thermal complementary coupling. The system comprises a light condensation assembly; the frequency division assembly is used for grading solar spectrum radiation; a photovoltaic cell power generation device; the methane oxygen-enriched combustion high-temperature photovoltaic power generation device is used for realizing oxygen-enriched combustion of natural gas by utilizing residual heat heat energy and generating power by utilizing radiation energy generated by high-temperature flue gas generated after combustion; the solid oxide electrolytic tank device is used for pushing solid oxide to electrolyze water to produce hydrogen by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step; and the thermal chemical reaction device is used for promoting each step of thermal chemical reaction by utilizing heat energy and electric energy contained in the high-temperature flue gas step by step. The energy source of the system is solar radiation and natural gas, hydrogen and electricity are produced, the system utilizes different energy conversion modes to achieve temperature gradient ordered conversion and utilization of residual light energy after solar frequency division, and complementary coupling of different qualities is achieved on the basis of energy gradient conversion.

The waste heat utilization equipment comprises a main flue, a bypass outlet and a bypass inlet are formed in the middle side wall of the main flue, a dust removal system is arranged on the main flue, and the bypass inlet is located in front of the dust removal system; an inlet of the bypass flue is connected with the bypass outlet, and an outlet of the bypass flue is connected with the bypass inlet; the heat exchanger is arranged on the bypass flue and connected with a water supply system of the boiler; the baffle device is arranged at an outlet of the bypass flue; the first temperature instrument is arranged on the side wall of the main flue and located between the bypass inlet and the dust removal system; and the controller is electrically connected with the baffle device and the first temperature instrument, and the controller is used for controlling the baffle opening degree of the baffle device based on the detected temperature of the first temperature instrument so that the flue gas temperature at the inlet of the dust removal system can be within a preset first temperature range. The technical problem that the waste heat utilization rate of the boiler is low is solved.

The invention discloses an anti-blocking method for an air preheater. The anti-blocking method comprises the steps that S100, the front-back pressure difference of the smoke side of the air preheater is obtained; s200, when the pressure difference is larger than a first preset value and lasts for at least a first preset duration, the unit is controlled to conduct soot blowing through a low-frequency high-sound-intensity sound wave soot blower; after the unit blows soot through the low-frequency high-sound-intensity sound wave soot blower for a first preset number of times, the pressure difference is detected, if the pressure difference is larger than a second preset value and lasts for at least a second preset duration, it is determined that blockages mainly containing ammonium bisulfate appear in the air preheater, pyrolysis operation is executed, and the second preset value is larger than the first preset value. The frequency of pyrolyzing ammonium bisulfate can be reduced, the service life of each part of the unit is prolonged, the operation stability of the unit is improved, and maintenance suggestions are provided for frequently accumulated ammonium bisulfate.

The invention belongs to the field of heat-engine plant boiler flue gas waste heat recycling, and discloses a boiler waste heat recycling system which comprises an air preheater and a boiler, and a flue gas outlet of the boiler is communicated with a flue gas channel inlet of the air preheater through a pipeline; an outlet of an air channel of the air preheater communicates with a combustion-supporting air inlet of the boiler through a pipeline, and an inlet of the air channel is used for introducing air to be heated. The air preheater further comprises a preheating unit, the preheating unit comprises a compartment, and the compartment is arranged on the air side of the air preheater and located between the smoke channel and the air channel. The air inlet end and the air outlet end of the compartment are communicated through a circulating pipeline; the circulating fan is arranged on the circulating pipeline and is used for driving the gas in the compartment to circulate; according to the scheme, by means of the buffer area formed by the compartments and the circulating fan, the temperature shock amplitude of the heat accumulator in the alternate heat absorption and heat release process is reduced, and deformation of the heat accumulator caused by too large local thermal stress is relieved; the problem that the heat accumulator is heated unevenly is solved.

The utility model aims to disclose a modularized countercurrent heat exchange plate type air pre-heater which comprises a plate type heat exchange unit, the plate type heat exchange unit comprises at least one layer of heat exchange module and flow guide modules, and the flow guide modules are arranged on the upper layer and the lower layer of the heat exchange module respectively. The flow guide module arranged on the upper layer of the heat exchange module is connected with a smoke inlet connector and an air outlet connector, and the flow guide module arranged on the lower layer of the heat exchange module is connected with a smoke outlet connector and an air inlet connector. Compared with the prior art, the defects that a rotary air pre-heater is blocked and an all-welded plate type air pre-heater can only exchange heat in a cross flow mode are overcome when the flue gas flow is large, the dust containing rate is high and substances prone to bonding are contained, the plate distance can be flexibly adjusted through the height of the protruding points, the air pre-heater is suitable for large-flow flue gas, blocking is avoided, and the service life of the air pre-heater is prolonged. Countercurrent flow heat exchange of the whole air pre-heater is achieved due to the existence of the flow guide strips, the end difference of the air pre-heater is small, the heat exchange efficiency of the air pre-heater is greatly improved, and the purpose of the air pre-heater is achieved.

The invention relates to the technical field of hot blast stoves, and discloses an energy-saving and environment-friendly chemical hot blast stove which comprises a main body, a synchronous feeding mechanism, an ash discharging mechanism and a waste heat utilization mechanism. A bottom plate is fixedly arranged at the bottom of the main body, a plurality of bases are fixedly arranged at the bottom of the bottom plate, a material mixing cavity is formed in the top of the main body, and the material mixing cavity is cylindrical. By arranging the synchronous feeding mechanism, the larger the air flow in an air input pipe is, the larger the thrust generated by air to turbine blades is, the higher the rotating speed of a turbine shaft is, the rotating speed of a vertical shaft is increased accordingly, the rotating speed of a rotating pipe is increased at the same time, the centrifugal force borne by a sliding block is increased, and the expansion amplitude of an arc-shaped blocking piece is increased; the flow area of the through holes is increased, the flow of the fuel gas is increased accordingly, so that the proportion of air and the fuel gas in the main body is kept stable, the fuel gas can be fully combusted, and the utilization rate of the fuel gas is increased.

The invention relates to waste heat recovery equipment and a natural gas hydrogen-doped combustion system. The waste heat recovery equipment comprises a first heat exchanger, a second heat exchanger and a spray tower, the first heat exchanger is provided with a first heat absorption side and a first heat release side, an outlet of the first heat absorption side is communicated with a combustion-supporting gas inlet of the combustor, the second heat exchanger is provided with a second heat absorption side and a second heat release side, and an inlet of the second heat release side is connected with a high-temperature flue gas outlet of the combustor. The spray tower is provided with a cooling water inlet, a smoke inlet, a smoke outlet and a spray water outlet, the smoke inlet is communicated with the outlet of the second heat release side, the spray water outlet is communicated with the inlet of the second heat absorption side, and the outlet of the second heat absorption side is communicated with the inlet of the first heat release side. According to the waste heat recovery equipment, two-stage waste heat recovery of high-temperature flue gas is achieved, the waste heat recovery efficiency is remarkably improved, combustion-supporting gas can be heated, accordingly, other combustion efficiency is improved, natural gas consumption and carbon emission are reduced, and the requirements for energy conservation and carbon reduction in the industrial high-temperature combustion process are met.

The utility model provides a sealing structure of a rotary air preheater, and belongs to the technical field of air preheaters. The rotary air preheater sealing structure comprises an air preheater body and a lifting structure, the air preheater body comprises a shell, a main shaft, a connecting plate, an upper sector plate, a lower sector plate, a rotor and a sealing piece, the main shaft is connected with the shell, the connecting plate is connected with the main shaft, the upper sector plate is hinged to the connecting plate, the lower sector plate is hinged to the rotor, and the lifting structure is connected with the shell. The lower sector plate is connected with the main shaft, and the rotor is connected with the main shaft. According to the sealing structure of the rotary air preheater, the height of the upper sector plate can be conveniently adjusted, the problem that the area of a triangular air leakage area is increased after the sealing piece is continuously abraded is solved, the area of the triangular air leakage area is kept in a stable interval, then it is guaranteed that the air leakage amount is kept in a stable area, and the energy consumption utilization efficiency is improved.

Disclosed in the present invention is a steam preheating system. The steam preheating system comprises at least one steam heating unit having a condensation section, a subcooling section and a liquid level tank, wherein the condensation section is configured to introduce steam, a liquid discharge port of the condensation section being in communication with the subcooling section by means of the liquid level tank; the liquid level tank is in communication with a steam introduction port of the condensation section by means of a steam balance pipe, condensate water drained from the condensation section through the liquid discharge port flowing into the liquid level tank by means of the gravity of the condensate water; the subcooling section is connected to a drain pipe configured to output the condensate water and provided with a drain regulation valve; and the opening degree of the drain regulation valve is controlled according to a liquid level signal of the liquid level tank. The steam preheating system uses a steam heating unit to heat a medium to be heated, and drained water in a condensation section into which high-pressure steam has been introduced is input into a subcooling section by means of a liquid level tank to exchange heat with said medium again in order that the temperature of the drained water reaches a certain subcooling, thus reducing the intensity of flash evaporation occurring in the drained water after the drain regulation valve in the drain pipe connected to the subcooling section, and being conducive to prolonging the service life of the drain pipe. Further disclosed in the present invention are a steam preheater and a garbage incinerator.

A heat exchange type burner for baking a torpedo ladle, comprising a Y-shaped burner (1), a gas pipe (2), a blast pipe (3), a connecting cover, (4) and a flue gas pipe (5), wherein the Y-shaped burner is respectively connected to the gas pipe and the blast pipe, the gas pipe is sleeved in the blast pipe, the blast pipe is connected to the connecting cover, one end of the blast pipe is sleeved in the flue gas pipe, and the flue gas pipe is connected to one end of the connecting cover. The heat exchange type burner further comprises an air distribution pipe (6) and a heat exchange fin (7), wherein the air distribution pipe is sleeved on the flue gas pipe, the air distribution pipe is communicated with the blast pipe, the heat exchange fin is fixed on the flue gas pipe, and the heat exchange fin is arranged between the air distribution pipe and the flue gas pipe. The burner can efficiently utilize flue gas heat to assist gas combustion, achieves high heat exchange efficiency and space utilization rate, has a good combustion effect, is easy to mount and dismount, and is convenient to use.

The invention relates to the technical field of steam generators, and provides a steam generator with an air preheater, comprising: a steam generator having an evaporation channel and a heating channel; the combustor is arranged on the steam generator, is provided with a preheated air inlet, is communicated with the heating channel and is used for heating the heating channel; the transition smoke box is communicated with the heating channel; the air preheater is provided with a preheating channel and an air flow channel, the preheating channel communicates with the transition smoke box, and the preheating channel is used for preheating air in the air flow channel after smoke is introduced into the preheating channel; and the air flow channel is communicated with the preheated air inlet. By means of the technical scheme, the problem that in the prior art, when the water inlet temperature of a steam generator is high or high-temperature circulating water is used, low-temperature flue gas emission cannot be achieved is solved.

The utility model relates to the technical field of air preheaters of heating boilers, in particular to an air preheater of a heating boiler, which is characterized in that dust in air is filtered by starting an air inlet mechanism, the filtered dust is discharged into a heat exchange mechanism, and the air discharged by the air inlet mechanism is heated through heat dissipation of a heat dissipation mechanism. Hot air is discharged into the heat supply boiler by starting the discharging mechanism to preheat the heat supply boiler, the inner wall of the heat dissipation mechanism is cleaned by starting the cleaning mechanism, the heat dissipation function of the heat dissipation mechanism is prevented from being affected, and the practicability of the equipment is improved; comprising a smoke inlet mechanism; the smoke inlet mechanism is installed at the top end of the heat exchange mechanism, the heat dissipation mechanism is installed in the heat exchange mechanism, the air inlet mechanism is installed on the right side of the heat exchange mechanism, the exhaust mechanism is installed on the left side of the heat exchange mechanism, and the cleaning mechanism is installed at the top end of the heat exchange mechanism.

The utility model discloses a heat pipe type air preheater system which comprises a main body and an air preheater, the main body is arranged at the bottom of the rotary air preheater, the main body is composed of a plurality of heat pipe heat exchanger modules which are vertically arranged and parallel to one another, and each heat pipe heat exchanger module comprises an air channel and a flue which are separated from each other. A heat pipe heat exchanger is assembled in each heat pipe heat exchanger module and stretches across the air channel and the flue, and a baffle is arranged at an air inlet in the bottom of the air channel of each heat pipe heat exchanger module. The heat pipe type air preheater is used for thoroughly solving the blockage problem of a rotary air preheater, the blockage and corrosion phenomena of the air preheater are effectively treated, and accidents such as negative pressure fluctuation of a boiler hearth, fan surging and the like which influence safe operation of the boiler are avoided.

The utility model discloses a molybdenum oxide rotary kiln high-temperature tail gas smoke dust treatment device which comprises a fresh air heat exchanger connected to one end of a smoke exhaust pipe of a rotary kiln, a smoke outlet end of the fresh air heat exchanger is connected with a cyclone dust collector, and one end of a fan air outlet of the cyclone dust collector is connected with a convection type heat exchange assembly. The utility model relates to the technical field of molybdenum oxide rotary kiln tail gas treatment, high-temperature waste heat in tail gas is utilized to preheat fresh air used by a rotary kiln, the temperature of the fresh air is increased, and then the combustion efficiency of the rotary kiln is improved. The cooled tail gas further enters a cyclone dust collector, large-particle dust in the flue gas is settled in the cyclone dust collector under the driving action of spiral airflow, and after further heat exchange is carried out on the flue gas subjected to primary dust removal, deep purification of the tail gas is achieved in cooperation with a spraying purification assembly.

The utility model discloses an accurate self-cleaning system of a rotary air pre-heater, and belongs to the technical field of air preheating equipment. The precise self-cleaning system of the rotary air pre-heater comprises a heat storage device; one end of the first pipeline is connected with the heat storage device, and the first pipeline is provided with a plurality of first air ducts; the pipeline valve comprises a shell, a valve plate and a driving mechanism, the shell is connected with the other end of the first pipeline, a plurality of second air ducts are arranged in the shell, the second air ducts are in one-to-one correspondence with the first air ducts and can be communicated with the first air ducts, the valve plate is rotationally arranged on the second air ducts, and the driving mechanism is connected with the valve plate; the driving mechanism can drive the valve plate to rotate so as to adjust the circulation area of the second air channel. According to the scheme, the problems that the circulation area of the cold end circulation branch bin of the rotary air pre-heater is larger than the circulation area of the hot air circulation pipeline, so that circulation hot air is not evenly distributed, regional soot blowing is achieved, and consequently heat storage elements are not even in cold and heat, partially corroded and blocked can be solved.

The invention relates to the technical field of air preheaters, and discloses an efficient compact type air preheater and a control method thereof.The efficient compact type air preheater comprises a preheater body, a plurality of heat exchange pipes are arranged in the preheater body, multiple sets of heat exchange pipes are distributed in the transverse direction, and each set of heat exchange pipes are connected through bent pipes to form a continuous water passing pipeline; the water inlet ends of the multiple sets of water passing pipelines communicate with a water inlet header pipe, the water outlet ends of the multiple sets of water passing pipelines communicate with a water outlet header pipe, a medium input pipeline and a medium output pipeline are arranged on one side of the preheater body, an air outlet is formed in the top of the preheater body, an air inlet is formed in the bottom of the preheater body, and an air circulation device covering the air outlet and the air inlet is arranged on the preheater body. The air circulation device comprises a flow expanding body and a flow gathering cover, the top air outlet end of the flow gathering cover is communicated with the air inlet position of a burner of the heating furnace, and a flow meter, a thermometer and a flow control valve are arranged on the medium input pipeline and the medium output pipeline. The waste heat utilization device has the effect of efficiently utilizing waste heat energy.

The utility model relates to the technical field of refractory brick tunnel kiln, and discloses a waste heat utilization device for a refractory brick tunnel kiln, including a heat recovery component and a preheating component, wherein the heat recovery component includes a kiln body, a recovery box is fixedly connected to the top of the kiln body, a heat storage box is fixedly connected to the top of the inner cavity of the recovery box, a blower is fixedly connected to the top of the recovery box, an air outlet on the right side of the blower is connected to a heat absorption pipe, and the end of the heat absorption pipe away from the blower passes through the inner cavity of the heat storage box. The beneficial effects achieved by the utility model are: the heat in the high-temperature flue gas is recovered and utilized by the heat recovery component, so that the heat is heated to heat the air entering the burner, and the normal temperature air is prevented from lowering its internal temperature after entering the burner, thereby increasing the fuel consumption; the partially recovered high-temperature air is directly transported to the preheating section of the kiln body through the preheating component to preheat the materials entering the kiln, further reducing the fuel consumption during the material roasting process, and improving the waste heat utilization rate of the tunnel kiln.

The utility model discloses an air preheater for a burner at the bottom of an ethylene cracking furnace, and relates to the field of ethylene cracking, the air preheater comprises an air preheater body and a connecting air duct, the air preheater body comprises a preheater shell, an air inlet and an air outlet are formed in the two ends of the preheater shell respectively, and a heat exchange tube bundle is arranged in the preheater shell; a heat source inlet and a heat source outlet are formed in the preheater shell and connected to the two ends of the heat exchange tube bundle correspondingly. The air outlet is connected to a combustor at the bottom of the cracking furnace through a connecting air duct; one air preheater body is matched with a plurality of cracking furnace bottom combustors. The cracking furnace solves the problem that the bottom space of the cracking furnace is limited, is suitable for limited space, saves occupied area and is high in heat exchange efficiency.