2378 results about "Flue" patented technology

The invention relates to a boiler flue gas temperature dynamic compensation method based on CFD-reinforcement learning, and belongs to the technical field of boiler operation control. The method comprises the steps that boiler operation parameters and flue gas temperature data are collected in real time, a multi-scale coupling three-dimensional CFD model is constructed, a macroscopic gas-solid two-phase flow-combustion reaction-radiation heat transfer coupling algorithm and a microcosmic pulverized coal particle combustion dynamics algorithm are fused, and hearth and flue temperature distribution is simulated and output; building a CFD-reinforcement learning fusion agent based on a CFD model, taking similar working condition agent parameters as initial values, combining historical and virtual data staged training, and reinforcing the weight of a key temperature measurement point through a focusing regulation and control strategy; an echo state network-predictive control collaborative algorithm is adopted, real-time data are input to obtain an initial adjustment amount, and after security constraint optimization, a compensation execution mechanism is controlled to act. The flue gas temperature is accurately and dynamically compensated, the adaptability to complex working conditions is improved, and equipment safety and operation efficiency are both considered.

The utility model discloses an energy-saving flue gas treatment device for an electric melting furnace, and relates to the technical field of flue gas treatment of electric melting furnaces. The device comprises a base and further comprises a purification box arranged on one side of the top of the base, a heat exchange box is arranged on the other side of the top of the base, a smoke inlet flue is connected to one side of the top of the heat exchange box in an inserted mode, and a liquid level meter is arranged at the front end of the heat exchange box. The spraying dust-settling assembly is arranged on the other side of the purifying box, water in the purifying box is pumped out through the pump machine during use, impurities in the filter cover are used for filtering, the situation that the impurities are sucked into the pump machine and attached to an impeller for a long time, and normal operation of the pump machine is affected is avoided, the impurities are conveyed into the annular spraying pipe through the conveying pipe, and the water purifying efficiency is improved. And then the flue gas which is fused with the water body and absorbs impurities is further absorbed and subjected to dust falling treatment under spraying of the spraying opening, so that the flue gas treatment effect of the device by utilizing a liquid absorption method is further improved, and the practicability is high.

The invention relates to the technical field of non-ferrous metal smelting flue gas treatment and resource utilization, and discloses a non-ferrous metal smelting multi-source flue gas efficient mixing and intelligent regulation and control method and system.The method comprises the steps that flue gas from different kilns enters a main flue through a multi-source flue gas branch regulation and control unit, and through rotational flow momentum, the multi-source flue gas enters the main flue; the basic consistency of each source flue gas structure is achieved; carrying out real-time evaluation on the mixed smoke on a key section; the multi-point sensor array continuously measures data and calculates a uniformity index to realize instant identification of flow field uniformity, time stability and local anomaly; based on measurement data, the intelligent control and operation optimization unit solves a comprehensive performance function in real time on a DCS / PLC platform. The system comprises a plurality of flue gas outlets, a top-blown furnace discharge outlet, a multi-source flue gas branch regulation and control unit and an annularly-collected flue gas total outlet. According to the method, the influence of inlet disturbance on the mixing quality is regulated and reduced from the source.

The invention discloses a treatment system and method for waste incineration fly ash washing liquid cooperating with flue gas purification, and the system comprises a semi-dry desulfurization tower, a dust remover, an ash silo, a washing tank, a buffer tank, a water supply preheater and a wet washing tower which are connected with a main flue of an incineration plant, the method comprises the following steps: transferring waste incineration fly ash collected in the system into the water washing tank, and adding water for washing to obtain water washing liquid and desalted fly ash; the method comprises the following steps: spraying fly ash water washing liquid by using a wet washing tower, recovering tail flue gas waste heat, deeply removing residual acid gas in flue gas, concentrating and reducing the water washing liquid, and controlling the spraying amount to adjust the concentration ratio so as to realize the separation and solid-liquid separation of chlorine salt; introducing the concentrated water washing liquid into a semi-dry desulfurization tower, atomizing the water washing liquid into fine liquid drops by using a rotary atomizer, contacting the fine liquid drops with hot flue gas, evaporating the fine liquid drops to dryness, and absorbing acid gas in the flue gas at the same time, thereby realizing zero emission of the water washing liquid and cooperating with flue gas purification. According to the invention, the problem of high energy consumption of fly ash washing liquid treatment is solved, and the resource utilization rate of the washing liquid is improved.

Flue gas is compressed to high pressures, which raises the partial pressure of carbon dioxide thus facilitating its absorption into physical solvents (e.g., water, salt solutions, methanol). When added onto an existing CO2-producing process, the compression is performed using multiple stages with intercooling. After the high-pressure carbon dioxide dissolves into the physical solvent, it flows through a series of pressure letdowns using turbines that allow the dissolved carbon dioxide to evolve from the solvent. Through a series of multiple compression stages, the evolved gas is compressed for transport, utilization, or storage. The flue gas that has been scrubbed of carbon dioxide flows through a series of expanders with interheating supplied from waste heat, or the heat of compression. The process is enhanced by employing alkalis that chemically react with acid gases, such as carbon dioxide. These same CO2-capture processes can be integrated into processes that produce shaft and / or electrical power.

The utility model relates to the technical field of household appliances, in particular to a liquid drainage mechanism and cooking equipment applying the same. The liquid discharge mechanism comprises a box body, a liquid inlet pipe, an exhaust pipe and an atomization mechanism, the liquid inlet pipe is communicated with the interior of the box body, the exhaust pipe is respectively communicated with the interior of the box body and the flue, at least part of the atomization mechanism is arranged in the box body, and gas formed by liquid in the box body through the atomization mechanism can be discharged to the flue through the exhaust pipe. Through the arrangement of the liquid discharging mechanism, waste water in the liquid discharging mechanism can be directly converted into a gas state and discharged from the flue, and the cleaning frequency and cleaning difficulty of a user on the liquid discharging mechanism and the oil cup are reduced. The cooking equipment comprises the liquid discharging mechanism, so that the cleaning frequency and cleaning difficulty of the liquid discharging mechanism and the oil cup by a user can be reduced.

The application discloses a supplemental combustion type flue gas molten salt heat exchanger and a working mechanism thereof, characterized in that: a supplemental combustion device is added in the upstream of a flue gas molten salt heat exchanger, the supplemental combustion device is connected with the flue gas molten salt heat exchanger through a flue, and a supplemental combustion type flue gas molten salt heat exchange integrated device is formed; the device comprises a supplemental combustion device or a supplemental combustion device, and a first-stage flue gas molten salt heat exchange component. The application can realize the functions of more uniform and efficient supplemental combustion heat transfer in the flue gas, realize a safer ignition mode of the supplemental combustion gas or the mixed body of the atomized supplemental combustion gas and liquid (or gas powder) outside the flue, realize the function of more convenient monitoring of the supplemental combustion, realize the complete decoupling of heat and electricity in the combustion engine power generation heat supply energy storage system, and realize the functions of self-supply of external power, heat storage or heat supply of the system.

The invention belongs to the technical field of industrial combustion safety control, and provides a double-channel industrial furnace gas combustion safety interlocking control system which comprises a gas / air flow ratio dynamic monitoring module, a flue CO concentration online detection module, a double-channel data conflict arbitration processor and a visual human-computer interface. Aiming at the prominent problems of incomplete combustion of coal gas, carbon deposition, detonation risk and the like which are easy to occur under the working condition of accelerated temperature rise, the system integrates visual double-insurance safety control of dynamic calculation of a flow ratio and real-time analysis of tail gas components, and all-directional safety protection in the combustion process is realized through a multi-parameter cooperative monitoring and intelligent interlocking mechanism; the detonation risk is obviously reduced; meanwhile, the air-fuel ratio fluctuation is accurately controlled within the range of + / -5%, and the carbon deposition phenomenon is effectively reduced; and remarkable economic benefits are created while reliable operation of equipment is guaranteed.

The utility model relates to a three-way flue and a flue gas treatment system equipped with the three-way flue, the three-way flue comprises a flue gas inlet section and two flue gas outlet sections, the two flue gas outlet sections are both provided with gate valves, the two groups of gate valves share one group of gate plate assembly, the gate plate assembly comprises a blind plate and a pore plate, the hole plate is a flashboard with a through hole, the blind plate is selectively inserted into one valve seat, and the hole plate is inserted into the other valve seat; and the three-way flue is provided with a blind plate switching execution mechanism for switching the blind plate and the pore plate. In the utility model, the two groups of gate valves share one group of gate component, and smoke can only be discharged from one smoke outlet section instead of being discharged from the two smoke outlet sections at the same time, so that the operation reliability is ensured, and the condition of misoperation is avoided; and the blind plate and the pore plate are adopted for switching, so that the sealing performance of the two groups of gate valves can be ensured.

The invention belongs to the technical field of kilns, and particularly relates to a large-scale top-loading dynamic calcining kiln which comprises a kiln body, the kiln body is of a vertical structure, a calcining area is arranged in the kiln body, a pusher is arranged at the bottom of the kiln body, and the large-scale top-loading dynamic calcining kiln is characterized in that a feeding port is formed in the top of the kiln body, the upper portion of the feeding port is communicated with a storage bin, and an electric valve is arranged on the feeding port; a material flow divider is arranged below the feeding hole, and a preheating dehydration area, a calcining area and a cooling area are sequentially arranged below the flow divider; a plurality of groups of internal heating type combustion units are arranged in the calcining area side by side, two or more layers of combustion chambers are arranged in each internal heating type combustion unit, a horizontal duplex flame path is arranged below each combustion chamber, a smoke chamber is arranged above each horizontal flame path, and a smoke hole array with an outlet facing downwards at an included angle of 25 degrees is formed in the side wall of each smoke chamber; the top of the internal heating type combustion unit is provided with a full-length sharp ridge, and the included angle of the top of the sharp ridge is 60 degrees. The method has the advantages that the problem of calcination of light magnesium oxide products with different granularities in the magnesite is solved, and the large-scale production target of annual output of 100,000 tons is met.

The invention relates to the technical field of collection equipment, in particular to a sample collection device for diesel engine gas detection. A first pipe opening, a second pipe opening and a third pipe opening are formed in the pipe body; a collecting barrel is installed in the first pipe opening, a limiting mechanism used for being connected with a flue of a diesel engine is installed on the second pipe opening, a flow monitoring mechanism is installed on the third pipe opening, and the particulate matter collecting barrel, the flow monitoring mechanism and the flue connecting mechanism are integrated on one pipe body, so that particulate matter collection and gas flow measurement are synchronously carried out; measurement errors caused by fluctuation of working conditions are greatly reduced, and the accuracy and reliability of detection data are improved.

The thermal chemical heat storage and carbon capture system comprises a coal-fired boiler, a calcination reactor and a carbonation reactor, the calcination reactor extracts high-temperature flue gas from the front wall of a hearth of the coal-fired boiler, the high-temperature flue gas drives CaCO3 in the calcination reactor to be decomposed into CaO and CO2, and heat storage is achieved; the reacted flue gas is pumped back into a tail flue of the coal-fired boiler, and the flue gas flow required by the reaction is controlled through a flow control valve on a pumping pipeline; caO generated by the calcination reaction can enter the carbonation reactor in the heat release stage, a heat release carbonation reaction is carried out, heat is released, CaCO3 obtained after the heat release reaction returns to the calcination reactor through a pipeline to serve as a reaction raw material, and CO2 obtained after the heat release reaction is output to a heat supply system. The integration of heat storage, heat release and carbon capture is realized by utilizing calcium-based material circulation, and the peak regulation capacity and the carbon capture economy of the coal-fired unit are remarkably improved.

The invention relates to a boiler flue gas heat recovery system which comprises a heat supply device, the heat supply device comprises a boiler and a heat supply pipeline, the heat supply pipeline comprises a boiler water inlet pipe and a boiler water outlet pipe which communicate with the boiler, a flue is formed in a smoke exhaust device, and a first heat exchanger and a second heat exchanger are sequentially arranged in the flue in the flue gas flowing direction; the first waste heat recovery device comprises a first waste heat recovery flow path and a heat pump, the first waste heat recovery flow path is connected with the first heat exchanger and a boiler water inlet pipe, the heat pump is arranged on the first waste heat recovery flow path, the second waste heat recovery device comprises a second waste heat recovery flow path, and the second waste heat recovery flow path communicates with external air and a boiler. By arranging the heat pump, on one hand, the heat transfer temperature difference can be increased, smoke sensible heat and even part of latent heat can be efficiently recycled, on the other hand, the recycled heat can be flexibly adjusted according to changes of boiler loads, and therefore the system can adapt to changes of loads output by the system under different conditions.

The desulfurization wastewater concentration system utilizing the flue gas waste heat of the coal-fired power plant comprises a flue, and an inlet of the flue is connected with a flue gas outlet of a boiler; the heat conduction oil heat exchanger is arranged on the flue, and an outlet of the heat conduction oil heat exchanger communicates with an inlet of the first pipeline; the heating part comprises a heater, a cold source inlet of the heater is used for introducing desulfurization wastewater, and the heater uses heat of the heat conduction oil in the first pipeline as a heat source so as to heat the desulfurization wastewater introduced into the heater; the evaporator is used for evaporating and concentrating the desulfurization wastewater introduced into the evaporator, the evaporator is provided with a first wastewater inlet, a wastewater outlet and a steam outlet, the first wastewater inlet is communicated with the cold source outlet of the heater, the wastewater outlet is used for discharging the concentrated desulfurization wastewater, and the steam outlet is used for discharging steam. Therefore, according to the desulfurization wastewater concentration system utilizing the flue gas waste heat of the coal-fired power plant, the energy consumption of desulfurization wastewater concentration can be reduced.

The invention discloses an ammonia spraying real-time feedback regulation method based on an SCR (Selective Catalytic Reduction) denitration system, which comprises the following steps: dividing a cross section partition on an outlet flue of the SCR denitration system, and synchronously collecting a flue gas sample on the cross section partition; dynamically adjusting the flow of a cooling medium of a gas cold air coil pipe through a self-adaptive fuzzy PID control algorithm, and cooling and dehumidifying each path of collected flue gas sample to obtain a dry flue gas sample; the concentration of each path of dry flue gas sample is analyzed in real time, and the optimal ammonia spraying valve opening strategy of each cross section partition is predicted by combining the ammonia spraying amount of each path, the flue gas flow of the SCR denitration system, the unit load and the ammonia escape concentration and adopting a multivariable model prediction control algorithm; and according to the predicted optimal ammonia injection valve opening strategy of each cross section partition, the ammonia injection valves of the corresponding cross section partitions are adjusted, and real-time feedback adjustment of ammonia injection is achieved.

The utility model relates to a converter gas recovery system which comprises a first cooling flue used for being connected with a converter, the first cooling flue is provided with a first gas outlet and a second gas outlet, the first gas outlet is connected with a gas processing mechanism, and the second gas outlet is connected with a gas waste heat recovery mechanism. And valve control units are respectively arranged at the first gas outlet and the second gas outlet. According to the utility model, the converter gas can enter the gas treatment mechanism to be treated and can also enter the gas waste heat recovery mechanism to be treated, so that the process flexibility is high, the treatment effect of the converter gas can be ensured, and the reliability and the safety of converter gas treatment are improved; the coal gas treatment mechanism and the coal gas waste heat recovery mechanism can be standby for each other, and when one mechanism is not used, the other mechanism can be switched for treatment, so that the coal gas treatment mechanism and the coal gas waste heat recovery mechanism are convenient to overhaul and maintain, and the stability of converter steelmaking production is ensured.

The present discloses a thermal energy recovery auxiliary system for temperature detection of molten steel in a steelmaking process, comprising an electric arc furnace, a water supply device, a power generation system, a piston type oxygen compression device, and one or more non-contact temperature measurement devices. A flue communicates with a side wall of the electric arc furnace. The water supply device includes a water supply tank, a water supply pipeline of an electrolytic cell, and a thermal energy recovery component. The power generation system includes a Seebeck-effect thermoelectric power generation component and an electrolytic cell. The piston type oxygen compression device forms a steam containment chamber and an oxygen containment chamber through a piston isolation. One end of each of the one or more non-contact temperature measurement devices communicates with the oxygen containment chamber and the other end of each of the one or more non-contact temperature measurement devices communicates with an interior of the electric arc furnace.

The invention discloses a waste heat recovery method and system for multi-stage utilization of flue gas heat of a tilting furnace, and the waste heat recovery method comprises the following steps: main flue gas of a waste heat boiler exchanges heat with main flue gas heated by a GGH heat exchanger through a first gas-gas heat exchanger to obtain first-stage heat exchange gas, and the first-stage heat exchange gas exchanges heat with circulating water to obtain second-stage heat exchange gas; the second-stage heat exchange gas exchanges heat with combustion-supporting air to obtain third-stage heat exchange gas; and the third-stage heat exchange gas exchanges heat with air to obtain fourth-stage heat exchange gas. High-temperature flue gas in a flue of the tilting furnace is subjected to multi-stage utilization, and an efficient waste heat recovery system is constructed. Flue gas of the tilting furnace is subjected to heat exchange through the waste heat boiler and then is subjected to efficient heat exchange with different medium and low temperature gases through the multi-stage series main heat exchanger. The device has the advantages of being simple in process, diversified in function, efficient in heat utilization and the like, and has popularization and reference significance for high-temperature flue gas waste heat utilization of other metallurgical furnaces.

The invention relates to the technical field of sintering flue gas purification, in particular to a sintering flue gas purification device capable of controlling temperature, which comprises a packed tower for purifying flue gas, a nitrogen inlet pipe of the packed tower is communicated with a nitrogen supply assembly for supplying nitrogen and a nitrogen storage assembly for storing nitrogen as a standby gas source through a three-way valve; a temperature adjusting assembly for adjusting the temperature of a packing layer in the packed tower is arranged in the packed tower; the temperature adjusting assembly comprises a main pipe arranged in an in-tower flue of the packed tower, the main pipe is communicated with a plurality of branch pipes, and the branch pipes are communicated with a plurality of tip pipes; a third electric valve is installed at the end, close to the main pipe, of the branch pipe, and a plurality of temperature sensors are installed in the circumferential direction of the tail pipe extending into the packing layer. When a temperature control accident occurs, nitrogen conveyed by the nitrogen supply assembly can reduce the temperature of the filler layer through the temperature adjusting assembly, and the accident is completely eradicated; the safety coefficient of the tower body design can be guaranteed, and the operation risk of the process is effectively reduced.

The invention discloses an ammonia escape control system of a selective catalytic reduction denitration system, and relates to the technical field of flue gas denitration of thermal power generating units. Accurate data support is provided for fine adjustment of the ammonia spraying amount by collecting and feeding back the nitrogen oxide concentration at the key position in the flue, so that the area with low local denitration efficiency is identified; meanwhile, the ammonia spraying amount is controlled through independent ammonia supply mother pipes and independent electric control valves on the basis of a plurality of ammonia spraying areas arranged in a matched mode of the measuring unit, a closed-loop control system with the regional nitrogen oxide concentration as a core feedback variable is formed, and each ammonia spraying area can respond independently; the problem of excessive or insufficient ammonia caused by traditional'one-step 'ammonia spraying is avoided, the ammonia spraying uniformity is improved, and the ammonia escape rate and the ammonia salt accumulation degree are reduced.

The invention belongs to the technical field of converter gas treatment, and relates to a converter high-temperature vaporization flue boiler outlet gas treatment device, which comprises a first conveying pipeline, a second conveying pipeline, a cyclone dust collector and a tempering dust collector, an inlet of the first conveying pipeline is used for being connected with a coal gas outlet of a converter vaporization flue boiler, an outlet of the first conveying pipeline is connected with an inlet of the cyclone dust collector, an inlet of the second conveying pipeline is connected with an outlet of the cyclone dust collector, and an outlet of the second conveying pipeline is connected with an inlet of the tempering dust collector. An outlet of the tempering dust remover is connected with an electrostatic dust remover; the first conveying pipeline is provided with fire extinguishing equipment used for extinguishing sparks in the pipe section, and the second conveying pipeline is provided with at least one fire pipe evaporator arranged in the flowing direction of coal gas. The problem that the fire tube is blocked due to zinc liquid drops, high-temperature molten ash and the like condensed by zinc steam in the coal gas heat and mass recovery process through the fire tube evaporator is solved.

The invention relates to an intelligent sound wave soot blowing method, system and terminal for a coal-fired boiler flue, and belongs to the technical field of coal-fired boiler flue cleaning.The intelligent sound wave soot blowing method comprises the steps that environmental parameters in the coal-fired boiler flue are monitored in real time; calculating sound wave parameters according to the environmental parameters; according to the sound wave parameters, a sound wave emitter is controlled to emit needed sound waves to a flue; the ash removal effect of accumulated ash in the flue is monitored; and according to the feedback ash removal effect, sound wave parameters are optimized so that sound wave energy can be evenly distributed in the flue. The flue dust removal device has the beneficial effect that the dust removal efficiency of the flue of the coal-fired boiler is improved.

The utility model relates to a three-way flue for waste heat recovery and a flue gas waste heat recovery system provided with the three-way flue, the three-way flue comprises a flue gas inlet section and two flue gas outlet sections, and the flue gas inlet section and the two flue gas outlet sections all adopt an evaporative cooling flue form; part of the evaporative cooling pipeline of the flue gas inlet section is coupled with at least part of the evaporative cooling pipeline of one flue gas outlet section to form a first heating surface, and the other evaporative cooling pipeline of the flue gas inlet section is coupled with at least part of the evaporative cooling pipeline of the other flue gas outlet section to form a second heating surface. According to the utility model, the three-way flue adopts an evaporative cooling flue form, so that the three-way flue has a waste heat recovery function; moreover, through the coupling between the flue gas inlet section and the flue gas outlet section, a reasonable heating surface is designed, the evaporative cooling effect and the heating uniformity of each part of the three-way flue are ensured, the number of steam-water pipelines can be reduced, and field implementation is facilitated.

The invention relates to the technical field of flue gas purification and recovery, in particular to an ultralow emission system and method for chemical looping combustion flue gas. The system comprises a fuel reactor, a flue gas outlet of the fuel reactor is connected with an inlet of a cyclone separator, and a first nitrogen oxide removal unit and a second nitrogen oxide removal unit are sequentially arranged on an outlet flue of the cyclone separator; the outlet flue is sequentially connected with the dust removal unit, the desulfurization unit and the recycling unit, and part of flue gas treated by the dust removal unit is used for diluting a denitration reducing agent in the second nitrogen oxide removal unit and / or returns to the fuel reactor for cyclic utilization; and part of recycled flue gas treated by the recycling unit is at least used for atomization of a denitration reducing agent in the first nitrogen oxide removal unit, and / or returns to the chemical looping coal feeding system. According to the system and the method, a whole-process treatment link of denitration, dust removal, desulfurization and carbon dioxide capture and recovery of the chemical looping combustion flue gas is constructed, corresponding pollutants are accurately removed by each unit, and the flue gas is recycled.

A method / system, which can be modified from the Flexicoking™ process / system, includes introducing a heavy petroleum feed into a fluidized bed in a reactor and converting the feed via a coking operation within the fluidized bed, producing an overhead stream with entrained coke fines from the reactor overhead and solid coke from the base of the reactor. The method includes injecting the solid coke into a fluidized bed in a burner and combusting the solid coke in the burner, producing hot coke particles. The method includes recirculating a portion of the hot coke particles to the fluidized bed in the reactor, discharging the remainder of the hot coke particles from the base of the burner and a flue gas from the burner overhead, and passing the flue gas and a caustic dispersion to a venturi scrubber to obtain a scrubbed flue gas. More petroleum coke can be produced from the method / system.

The invention discloses a waste gas purification method, and belongs to the technical field of environmental protection. The method comprises the following steps: converting nitrogen-containing substances into NOO and adding the NOO into a high-temperature non-combustion area at the tail end of a hearth or the front end of a flue in combustion equipment, wherein fuel is burnt out; nO is cracked in the region to generate active free radicals; the free radicals oxidize NO in the flue gas to generate NO, and oxidize SOO, CO and VOCs to generate oxidation products; continuously cracking the generated NOs to form chain circulation; and the oxidation product is removed in a subsequent purification system. The NOs comprise pure NOs and dimers NO (nitrogen tetroxide) thereof, and NO is decomposed into NOs to participate in the reaction at high temperature. According to the invention, by optimizing the NO adding position, collaborative purification of multiple pollutants such as NOx, SOs, CO, VOCs and the like is realized, a reducing agent does not need to be added, ammonia escape is avoided, the investment and operation cost is low, and the method is particularly suitable for treatment of high-concentration CO and VOCs flue gas in industries such as coking and the like.

This invention discloses a method and system for evaluating the performance of kitchen oil filtration based on the distribution characteristics of oil fume particles, belonging to the field of kitchen oil filtration performance research technology. Specifically, this method involves: comprehensively evaluating the dynamic changes in the airflow velocity of oil fumes within the flue and the dynamic changes in the concentration of oil fumes within the flue. If the comprehensive evaluation determines that no pretreatment is required, adaptive monitoring of the oil fume filtration efficiency is immediately initiated. If the oil fume filtration efficiency meets the standard, the oil filtration performance is confirmed to be qualified; if the oil fume filtration efficiency does not meet the standard, the oil filtration performance is confirmed to be unqualified. This application provides an effective solution to the problem of insufficient comparability of kitchen oil filtration efficiency capture and evaluation results in existing oil filtration performance evaluations.

The invention belongs to the technical field of gas concentration detection, and particularly relates to a rotary kiln infrared gas analyzer which comprises a shell assembly, a heat dissipation device is installed on the shell assembly, a gas suction device is installed at one end of the shell assembly, a filtering device is fixedly connected to the gas suction device, and a supporting plate is fixedly installed in the shell assembly. A detection gas chamber, a reference gas chamber and a correction gas chamber which are arranged in parallel are fixedly arranged on the supporting plate in a penetrating manner, and structures such as a processor, a controller, a temperature sensor, a gas pressure sensor, an electric heating wire and the correction gas chamber are arranged; the air temperature in the correction air chamber is heated to be the same as the air temperature in the detection air chamber through the electric heating wire, the air pressure in the detection air chamber is adjusted to be the same as the air pressure in the heated correction air chamber through the cooperation of the air pump and the exhaust valve, and then the detection result is calculated in equal proportion. The concentration of the target gas in the flue of the rotary kiln in the normal temperature state can be obtained, and the accuracy of a detection result is greatly improved.

The utility model relates to the technical field of boilers, in particular to a low-nitrogen gas steam boiler which comprises a boiler body, two groups of water pipes are arranged in the boiler body and include an ascending pipe and a descending pipe, the descending pipe is located on the periphery of the ascending pipe, a gas distributor is arranged on one side of the ascending pipe, and a burner is installed on the side, facing the ascending pipe, of the gas distributor. A preheater is arranged on the outer side of the furnace body, one side of the furnace body is connected with a flue, a smoke pipe is vertically installed in the middle of the interior of the preheater, the top end of the smoke pipe is connected with the flue, and the bottom end of the smoke pipe is connected with a chimney. According to the low-nitrogen gas-steam boiler, the boiler body and the combustor are integrally designed, so that complicated structures such as a return smoke tube and a reversal chamber in a traditional boiler are omitted, the overall size of the boiler is greatly reduced, the weight is reduced accordingly, and the boiler is convenient to install and transport.

This utility model discloses a ventilation and anti-clogging device for a standby boiler dust collector, comprising: an inlet flue, an induced draft fan, a connecting assembly, and a limiting assembly. The induced draft fan is located at one end of the inlet flue. The connecting assembly includes a branch pipe located at the bottom of the inlet flue, with a first gate valve located in the middle of the branch pipe and a series pipe located at the bottom of the first gate valve. The limiting assembly is located at the output end of the induced draft fan and is used to restrict gas flow. The limiting assembly includes a first pipe located at the output end of the induced draft fan, with a second gate valve located at one end of the first pipe. Through the design of the branch pipe, the first gate valve, and the series pipe, this utility model allows the first gate valve to be opened during operation, enabling the induced draft fan of the adjacent operating boiler to draw away leaked flue gas and maintain a slight negative pressure inside the standby boiler. This eliminates the need to operate the standby boiler's induced draft fan, keeping the furnace and tail flue dry and thus avoiding wasted electricity.