751results about "Steam boilers" patented technology

The invention discloses a circulating fluidized bed boiler water supply optimization method and system, and belongs to the technical field of boiler energy conservation. The system mainly comprises a condensate water tank, a demineralized water tank, a slag cooler, a deoxygenization water tank, a condensate water pump, a demineralized water pump, a plate heat exchanger, a reverse osmosis membrane group, a demineralized water buffer tank and the like. The principle of'condensate water priority 'is adopted, the supply amount of condensate water is preferentially adjusted according to the liquid level of the deoxygenated water tank through the intelligent control unit, and the insufficient part is supplemented by demineralized water; the demineralized water subjected to heat exchange by the slag cooler is intelligently distributed to a demineralized water tank, a condensation water tank or a deoxygenization water tank according to the water outlet temperature; the plate heat exchanger can preheat reverse osmosis inlet water by adopting a desalting water mode or a steam mode; the demineralized water buffer tank effectively inhibits water impact. Dynamic balance and heat energy gradient utilization of steam condensate water and demineralized water are achieved, the problems of water tank overflow and energy waste are effectively solved, and the economical efficiency and stability of boiler operation are remarkably improved.

The embodiment of the invention discloses a pressure control method and system for a once-through steam generator of a nuclear reactor, and relates to the technical field of nuclear power. Determining power deviation according to the operation power and the secondary circuit load; according to the power deviation, the rated power corresponding to the nuclear reactor and the rated feed water flow corresponding to the once-through steam generator in the nuclear reactor, pressure regulation information is determined; and adjusting the pressure of the once-through steam generator according to the pressure adjusting information. According to the embodiment of the invention, a PID controller is not needed in the process of determining the pressure regulation information, but the pressure regulation information determined based on the power deviation directly acts on the feed water flow regulation valve, so that rapid and accurate OTSG pressure control can be realized.

A method for producing and transferring heat The method comprises producing heat in a first thermal device (910) and heating particulate material in the first thermal device (910) and conveying a part (MIH) of the particulate material, the part (MIH) having a first temperature (T1), from the first thermal device (910) to a mixing unit (100). The method comprises conveying a part (MIC) of particulate material, the part (MIC) having a second temperature (T2), from a second thermal device (920) to the mixing unit (100) and mixing the part (MIH) of the particulate material coming from the first thermal device (910) with the part (MIC) of the particulate material coming from the second thermal device (920) in the mixing unit (100) to form particulate material having a third temperature (T3). The method comprises conveying at least a part (MOH) of the particulate material having the third temperature (T3) from the mixing unit (100) to the second thermal device (920). A system for the same. A mixing unit suitable for the method.

The invention discloses a boiler operation intelligent diagnosis platform based on multi-source data fusion. The boiler operation intelligent diagnosis platform comprises a data acquisition and preprocessing module, a multi-source data fusion and feature extraction module, an intelligent diagnosis and decision support module and a man-machine interaction and alarm module. According to the invention, a modularized multi-source data fusion intelligent diagnosis platform is constructed, various heterogeneous data are uniformly processed through a data acquisition and preprocessing module, and a high-quality data basis is provided for upper-layer analysis; a multi-source data fusion and feature extraction module is used for deeply mining associated features among data, and a fusion feature set capable of comprehensively reflecting the boiler health state is constructed; and finally, through an intelligent diagnosis and decision support module, in combination with historical data and real-time fusion features, early warning, accurate positioning and root analysis of boiler faults are realized, an operation and maintenance mode is converted into predictive maintenance from post-maintenance and regular maintenance, and the safety and reliability of boiler operation are remarkably improved.

The invention discloses a steam utilization device for steam turbine overhaul, and belongs to the technical field of steam utilization, the steam utilization device comprises an equipment base, a heat exchange box body is fixedly mounted at the top of the equipment base, the top of the heat exchange box body is fixedly connected with an evaporation boiler through a heat conduction structure, and the evaporation boiler and the heat exchange box body are in heat conduction fit; an energy conversion shell is fixedly installed at the position, close to the heat exchange box body, of the top of the equipment base, a first-stage condenser is fixedly installed at the position, close to the energy conversion shell, of the top of the equipment base, and the inlet end of the first-stage condenser communicates with the outlet end of the energy conversion shell in a sealed mode through a pipeline. High-temperature and high-pressure steam firstly enters the heat exchange rectangular pipe to release heat energy, condensate water containing impurities is evaporated and purified through the discharged high-temperature steam, thorough separation of the impurities and a water body is achieved, and the situation that steam water containing the impurities enters a steam turbine again to pollute the steam turbine is fundamentally avoided.

The utility model discloses a composite high-voltage solid heat storage electric boiler, and relates to the field of electric boilers. A composite type high-voltage solid heat storage electric boiler comprises a boiler cabinet and further comprises an installation cavity, a heat storage cavity, a heat storage cavity and a heat storage cavity, the bearing plates are fixedly connected to the inner wall of the mounting cavity at equal intervals; the solid heat storage bricks are placed on the bearing plate; the connecting rod is connected into the mounting cavity in a sliding mode, and a plurality of fixing blocks used in cooperation with the bearing plate are fixedly connected to the connecting rod at equal intervals; according to the utility model, through the cooperation of the pressurizing pipe, the piston disc, the connecting rod and the fixing block, the solid heat storage brick can be preliminarily fixed, and the heat conduction rod conducts heat in the mounting cavity to the sleeve, so that gas in the sleeve is heated and expanded to increase air pressure, and the clamping force of the fixing block on the solid heat storage brick is further increased; the fixing stability of the solid heat storage brick in the working process is effectively improved, looseness caused by factors such as vibration is reduced, and stable operation of equipment is guaranteed.

The present application belongs to the technical field of waste heat recovery, and discloses a new fountain type waste heat boiler structure, which comprises a heat exchange furnace shell, one end of the heat exchange furnace shell is fixedly sleeved with a water inlet sleeve, the other end is fixedly sleeved with an intermediate cylinder, and the inside of the heat exchange furnace shell is provided with heat exchange pipes. The high-temperature medium entering from the inlet end is lowered in temperature and enters the next working section, the cooling water in the intermediate cylinder rises after heat exchange with the high-temperature medium, the high-temperature medium is led out through the no. 1 hole and the annular cavity outside the water inlet sleeve after heat exchange, a "fountain type" liquid inlet and outlet guide is formed, the arrangement mode of the heat exchange pipes is improved, the temperature difference stress generated is reduced, the stress distribution is more uniform, the high temperature inside the heat exchange pipes is absorbed in time, the high-temperature section of the heat exchange pipe inlet is ensured to have no large temperature difference, stress concentration is avoided to cause the high-temperature section of the heat exchange pipe to break, the service life of the heat exchange pipe is prolonged, and the waste heat absorption effect is improved.

This application belongs to the field of nuclear power plant engineering, specifically relating to a device for secondary side maintenance of a horizontal steam generator used in a nuclear power plant. The device includes: an air supply duct, an air supply fan, an exhaust duct, and an exhaust fan. One end of the air supply duct enters the steam generator through a manhole and extends to the bottom of the heat transfer tubes of the steam generator; the other end of the air supply duct is connected and fixed to the outlet of the air supply fan. One end of the exhaust duct is placed on an underwater steam distribution plate inside the steam generator, and the other end passes through the manhole and is connected and fixed to the inlet of the exhaust fan. No special placement platform is required; any location on site can be used as a placement location. Internal maintenance can be achieved simply by opening one manhole, improving maintenance efficiency.

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.

The utility model discloses a steam boiler ash removal device, relates to the technical field of boiler ash removal, and aims to solve the problem of low boiler ash removal efficiency in the prior art, the steam boiler ash removal device comprises a moving mechanism, the moving mechanism comprises a bottom plate, universal wheels, a push handle and a hydraulic elevator, and a mounting plate is fixed at the top of the moving mechanism. And supporting plates are fixed to the two sides of the top of the mounting plate correspondingly, a collecting box is arranged between the two supporting plates, the two supporting plates are rotationally connected with ash removal mechanisms correspondingly, and each ash removal mechanism comprises a fixing cylinder, a second servo motor, an ash removal shovel, a spiral conveying rod and a discharging pipe. According to the boiler ash removal device, the ash removal mechanism is inserted into the boiler, the ash removal shovel is inserted into the boiler ash, the second servo motor drives the spiral conveying rod to rotate, the boiler ash is conveyed in the fixing barrel and discharged into the collecting box through the discharging pipe, and therefore manual ash removal of the boiler is replaced, the labor intensity of workers is relieved, and the working efficiency is improved. And the working efficiency can be improved.

This invention discloses a boiler load adaptive regulation system based on solid thermal storage, relating to the field of power plant boiler combustion technology. The invention includes a boiler with an economizer arranged in its tail flue, and a flue gas extraction pipe connecting the boiler and the economizer. The end of the flue gas extraction pipe is connected to an ash separation component, the outlet of which is connected to the flue gas inlet of a solid thermal storage component, and the flue gas outlet of the solid thermal storage component is connected to the air preheater inlet. This invention extracts high- and medium-temperature flue gas from different locations in the boiler during rapid load reduction, stores the heat from the high-temperature flue gas using solid thermal storage technology, and releases the heat from the solid thermal storage component when rapid load increase is needed. This heat is then used to increase the primary air temperature and pulverized coal temperature through a heat exchanger, enhancing the combustion intensity of pulverized coal in the furnace. By reducing the amount of high-temperature flue gas in the boiler, the load change rate of the unit is effectively improved.

The invention discloses a heat pipe type steam generator based on boiler exhaust smoke waste heat utilization, and relates to the field of steam generators, the heat pipe type steam generator specifically comprises a steam generator shell, a heating furnace is arranged in the steam generator shell, a front heat exchange smoke pipe is arranged on one side of the heating furnace, and rear heat exchange smoke pipes are arranged on the two sides of the front heat exchange smoke pipe; a smoke outlet is formed in the top of the steam generator shell, and a residual smoke pushing mechanism and an intermittent smoke discharging mechanism are arranged on one side of the rear heat exchange smoke pipe. The multiple heat conduction bins are arranged in the area located at the tail end of the heat exchange smoke pipe, hot smoke is fed into the heat conduction bins through the push plate moving in a reciprocating mode, the heat conduction bins conduct heat into water again, the heat utilization effect of the hot smoke is improved, meanwhile, the cover ring and the pressing plate are arranged at the smoke exchange position, and the heat exchange efficiency is improved. Hot flue gas is directly extruded and fed into the heat exchange flue gas pipe through reciprocating motion, the residence time of the high-temperature flue gas is shortened, and heat waste of the high-temperature flue gas is avoided.

The systems and methods of the invention pertain to analyzing steam generator tube data for the detection of wear. Further, the invention is capable of performing a comparison of current tube signal data to baseline or historic tube signal data, e.g., from previous and / or the first, in-service inspection of the steam generator. The systems and methods are automated and can generate results to show potential tube-to-tube contact wear areas as well as the progression of tube-to-tube gap reduction within a steam generator tube bundle. In certain embodiments, the invention is capable of comparing current and historical eddy current data to determine the difference that may be related to degradation or other interested phenomena, and of processing and trending historical comparison results to establish normal variance and detect abnormal variances.

The application relates to the technical field of household appliances, and particularly discloses a control method and device of a cooking equipment, a storage medium and the cooking equipment, wherein the cooking equipment comprises a combustion chamber, the combustion chamber is provided with a burner and a steam generator, the method comprises the following steps: obtaining combustion state information of the burner in an operation process and environment state information of the combustion chamber; determining a flame state of the burner according to the combustion state information and the environment state information; and controlling at least one of the burner and the steam generator according to the flame state, so as to maintain the burner in a safe and stable operation state. According to the control method, the combustion state of the burner and the environment information of the combustion chamber are obtained in real time, the flame state is determined after fusion analysis, the burner or the steam generator is intelligently controlled according to the flame state, the burner is ensured to be always in a safe and stable operation state, the reliability and the service life of detection can be improved in a high-humidity environment, and the environment change is self-adapted.

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.

A nuclear power plant comprising at least one nuclear reactor having a steam generator, a steam cycle including the steam generator, a first turbine fluidly coupled to the steam generator, a first condenser fluidly coupled to the first turbine, and a feedwater heater fluidly coupled to the first condenser and the steam generator, an intermediate thermal loop including the first condenser, and an evaporator, and an organic cycle including the evaporator, a second turbine fluidly coupled to the evaporator, a second condenser fluidly coupled to the second turbine, and a heat exchanger fluidly coupled to the second condenser and the evaporator.

This utility model discloses a heating device for drying a fluidized bed. It includes a steam boiler, with a steam pipe fixedly connected to the upper surface of the steam boiler. The steam pipe is fixedly connected to a shell, with a fluidized bed above the shell and a wind chamber below. Multiple layers of steam ring pipes are embedded in the inner wall of the fluidized bed. The steam ring pipes are fixedly connected to a condensate pipe and a steam riser pipe. The steam riser pipe is fixedly connected to a spiral finned tube, which is fixedly connected to the wind chamber. A fan is fixedly connected to the left surface of the wind chamber, and an air inlet pipe is fixedly connected to the upper surface of the wind chamber. An air distribution plate is fixedly connected to the upper surface of the air inlet pipe. Through this structure, the embedded steam ring pipes avoid the problem of adhesion in areas prone to dead zones on the surface of the internal heat exchanger. Furthermore, the steam heat is transferred to the fluidized air through the spiral finned tubes to achieve primary drying, while the material is further dried secondaryly through the embedded steam ring pipes within the fluidized bed, fully utilizing a single heating system for double-efficiency material drying.

This invention provides a novel PTC steam generator, comprising a PTC heating core. The end of the PTC heating core furthest from the outlet is connected to a flow channel frame. After connection, the PTC heating core is installed inside a housing. A sealing ring is installed at the outlet end of the housing, followed by a sealing device. The housing has a liquid inlet and a gas outlet. The flow channel frame has spiral flow channel ribs centered on the PTC heating core. These ribs, along with the outer surface of the PTC heating core and the inner surface of the housing, form a spiral liquid flow channel, ensuring sufficient contact between the liquid and the PTC heating core to generate gas. Compared to existing technologies, the advantages of this invention are: the spiral flow channel ribs centered on the PTC heating core maximize the utilization of the PTC heating core's surface to create a liquid flow channel, ensuring sufficient contact between the liquid and the heat source PTC heating core to generate gas, thus improving product performance.

This utility model relates to the field of steam equipment technology, specifically a steam generator for steam equipment. It includes a housing, a heating chamber disposed inside the housing, a scale-collecting chamber located below the heating chamber, and a water inlet and an air outlet correspondingly disposed on the housing and communicating with the heating chamber. The water inlet is located on the front top of the housing and is angled, while the air outlet is located on the rear top of the housing, with its central axis perpendicular to the outer surface of the housing. The inner opening of the air outlet is located above the heating chamber and the scale-collecting chamber. It also includes a heating element assembled inside the heating chamber, which employs a U-shaped heating tube structure to increase the heating surface area. This utility model improves heating efficiency, reduces costs, and prevents clogging of the air outlet by replacing the single-ended heating tube with a traditional U-shaped electric heating tube and optimizing the air outlet structure of the steam generator.

A method for measuring the deep peak regulation load of a coal-fired boiler in an electric power auxiliary service market comprises the steps that preparation before testing is conducted, specifically, the quality of coal entering the boiler is selected, and all devices in a boiler system are verified; coal with the selected coal quality is put into the boiler to be combusted, and when the boiler load reaches or exceeds the soot blowing threshold value, soot blowing is conducted on the heating surface of the boiler comprehensively; after soot blowing is finished and a preset stable combustion condition is met, the boiler load is gradually reduced according to a preset rule; in the process of reducing the boiler load, monitoring each parameter of each device, and when each parameter exceeds a corresponding safety limit value, determining whether the abnormity is recoverable or not and determining the abnormity type; and for recoverable anomalies, the boiler load is gradually increased according to the type of the anomalies until the parameters are kept stable under the current boiler load for a preset time length, and the current boiler load reaching the preset time length serves as the deep peak regulation load lower limit. The power dispatching accuracy and the operation efficiency of the peak regulation market can be improved, and a reliable basis is provided for dispatching decision making.

The utility model relates to the technical field of steam generation, in particular to a heat storage steam generation device, which comprises an energy storage tank, a steam generator, a steam generator, a steam generator, a steam generator, a steam generator, a steam generator and an energy storage tank, the energy storage tank is internally provided with a partition plate, and the partition plate divides the interior of the energy storage tank into a heating chamber and an energy storage chamber; the electric heater is arranged in the heating chamber; the heat exchange assembly is fixedly connected with the inner wall of the energy storage tank; the heat exchange assembly comprises a heat exchange pipe arranged in the energy storage chamber. The moving structure is fixedly connected with the heat exchange tube and is used for moving the heat exchange tube; the two heat insulation structures are symmetrically arranged on the two sides of the energy storage tank and fixedly connected with the energy storage tank. By operating the moving structure, the moving structure can enable the heat exchange pipe to vertically move, so that the heat exchange pipe is separated from the molten salt, the heat exchange pipe and the molten salt are separated by utilizing the heat insulation structure, liquid in the heat exchange pipe is prevented from being heated in the molten salt melting process, and thus heat loss is avoided.

The invention discloses a water-vapor separation high-temperature steam boiler, which relates to the technical field of steam boilers, and comprises a water-vapor play prevention mechanism, an evaporation chamber, a condensing device, a driving device and a combustion device, the condensing device exchanges heat with high-temperature flue gas, preheats water entering the evaporation chamber, reduces thermal stress, and improves the combustion efficiency. The water vapor moving prevention mechanism controls a water vapor flowing path in the evaporation chamber, so that more sufficient wall-attached flowing or disturbance flowing of water is formed in the evaporation chamber, the heat exchange area of water and the inner wall of the evaporation chamber is increased, the water is promoted to rapidly absorb heat and evaporate, meanwhile, an ascending path of water vapor in the boiler is prolonged, and the heat exchange efficiency is improved. And the retention time and evaporation time of water are prolonged in a limited boiler space, so that the water in the steam can be heated and evaporated more sufficiently, the content of the water carried in the steam is reduced, the dryness and output temperature of the steam are improved, and the energy-saving and water-saving effects in the boiler operation process are achieved.

A fully premixed combustion low-nitrogen steam boiler relates to the technical field of steam boilers and comprises a box body and a plurality of standardized boiler modules sequentially arranged along a mounting cavity of the box body. The boiler module is composed of a boiler body, a full premixing burner, a negative pressure steam pocket and a symmetrical tubular heat exchanger. Spiral grooves are formed in the walls of the furnace body combustion cavities and communicated with the water heating cavities, so that water flow forms a thin-layer water film to strengthen heat exchange and prevent local dry burning, and the adjacent furnace body combustion cavities are communicated to realize smoke cascade transmission; hot air flow spirally circulates to prolong the heat exchange time, the full-premixing combustor is combined with the impeller to diffuse fuel gas, the metal fiber net forms low-temperature diffusion flames, and generation of nitric oxide is remarkably inhibited; the negative-pressure steam pocket accelerates evaporation in a negative-pressure environment, so that the steam production rate is increased; flue gas forms a U-shaped loop through the flow guide structure and flows through the tubular heat exchanger. The modular design supports on-demand combination and later expansion, the overall structure is high in heat efficiency, low in emission and safe and reliable in operation, and the multi-working-condition load requirement is met.

The present application relates to a method for reducing the start-up time of a water-cooled wall standby furnace, which uses equipment including a gasifier water-cooled wall, a steam drum and a water-cooled wall circulating water pump. The present application makes full use of the heat of the continuous blowdown of the operating series steam drum, and realizes the maintenance of the standby series water-cooled wall temperature, and the system is simple and the control is convenient; compared with the prior art, the present application can reduce the start-up time of the standby furnace, reduce the impact of the gasifier trip on the device operation load, and reduce the economic loss caused by shutdown. According to the water baking time of 8 hours, the present application can reduce the economic loss of 8 hours caused by unplanned shutdown, and according to the gasification scale of 100,000 standard cubic meters / hour of effective gas production, the economic loss can be reduced by nearly 500,000 yuan.

The application relates to a boiler container, which comprises a container with a containing cavity, a plurality of openings in communication with the containing cavity, an inner wall of the container provided with a reflecting layer, and an outer wall of the container provided with a heat insulation layer; a plurality of boilers, at least one of which is arranged in the opening, and any two adjacent boilers are communicated through at least one heat transfer pipe, the heat transfer pipe is arranged in the containing cavity, and the reflecting layer is used for reflecting heat radiated outward by the heat transfer pipe to the heat transfer pipe. As known from the above, the boiler container in the embodiment can reduce the heat dissipation of the heat transfer pipe, reduce the heat energy loss of the boiler container, increase the number of the heat transfer pipes, and guarantee the energy conversion efficiency of the boiler container.

The invention discloses a cooperative control method and device for multiple fluidized bed boilers and a medium, and is applied to the field of advanced process control. The method comprises the following steps: acquiring a pressure change rate corresponding to a mother pipe pressure signal; determining a load adjusting instruction corresponding to the boiler according to the pressure change rate and the absolute value, and determining a corresponding load adjusting quantity according to the pressure change rate and boiler performance parameters corresponding to the boiler; and if the absolute value of the second derivative of the pressure change rate is not smaller than a decoupling threshold value in the process that the boiler carries out load adjustment according to the load adjustment instruction and the load adjustment quantity, corresponding air-coal decoupling compensation operation is determined according to the second derivative of the pressure change rate, and cooperative control is carried out based on the air-coal decoupling compensation operation and load adjustment. According to the method, the mother pipe pressure signal belongs to a feedforward signal in the boiler operation process, and compared with post feedback, the response speed is increased, and the response precision is improved. And the air-coal decoupling compensation operation and the load regulation are cooperatively controlled, so that the quality, the safety and the economy are improved.

The utility model discloses a boiler with double-color water level display, which comprises a body, a first pipeline, a second pipeline and a double-color water level display device are arranged at one end of the body, the first pipeline and the second pipeline are communicated with the inside of the body, the double-color water level display device is communicated with the first pipeline and the second pipeline, and the double-color water level display device comprises a fixing plate and a glass tube arranged in the middle of the fixing plate. The upper end and the lower end of the glass tube are communicated with the first pipeline and the second pipeline respectively, and a pressurizing tube which is coaxial with the glass tube and used for enhancing impact force of liquid entering the glass tube is arranged at the joint of the end of the first pipeline and the upper end of the glass tube. A sewage discharge pipe which is coaxial with the glass pipe and can be opened and closed is arranged at the joint of the end part of the second pipeline and the lower end of the glass pipe. The boiler anti-scaling device has the advantages that anti-scaling treatment on a boiler is guaranteed, the glass tube can be flushed without a blind area, water level monitoring display is prevented from being affected by accumulation of water granulated slag in the glass tube, and the accuracy of water level monitoring is guaranteed.

A biomass steam boiler comprises a combustion chamber and a cylindrical body arranged above the combustion chamber, an upper cavity and a lower cavity are communicated through a plurality of heat exchange pipes, a water pressing strip with the width smaller than the inner diameter of each heat exchange pipe is fixed to the top in each heat exchange pipe, and semicircular water pressing pieces arranged up and down are arranged on the sides of the water pressing strips respectively. The semicircular water pressing piece is formed by stamping, cutting and bending a water pressing strip body, a notch structure corresponding to the water pressing piece in shape is formed in the cutting portion of the water pressing strip, a smoke exhaust pipe is arranged on one side of the top of the outer portion of the body, a steam outlet is formed in the top of the upper cavity, and a water adding opening is formed in one side of the lower cavity. The water pressing strip and the water pressing piece form a good water blocking structure, water in the heat exchange pipe, particularly heated boiling water, can be greatly reduced, water resources can be effectively utilized, heat discharged along with the water is reduced, and liquid water can be effectively prevented from entering external equipment to corrode the external equipment for a long time.

The application discloses a full-hydrophobic baffle temperature-regulating subcritical low-calorific-value coal gas-fired boiler, the lower part of the water-cooled wall is a low-calorific-value coal gas combustion zone, the upper part is a variable cross-section heating surface arrangement zone, low-temperature superheaters and low-temperature reheaters are arranged in the front and rear flues of the wall respectively, and flue gas baffles are arranged at the outlets of the two to regulate the temperature. The lower part of the wall is sequentially connected with a high-temperature economizer, a denitration device and a low-temperature economizer for hierarchical arrangement. The heating surfaces such as the low-temperature superheater and the screen-type superheater are horizontally arranged. The application utilizes the baffle temperature regulation to improve the heat transfer efficiency and fuel utilization rate; the hierarchical economizers guarantee the full-load denitration of the boiler and meet the requirement of the flue gas temperature; and the horizontally arranged heating surfaces realize full hydrophobicity, effectively preventing the accumulation of oxide scales.

This utility model discloses a single-channel positive pressure gas waste heat boiler, specifically relating to the field of boiler technology. It includes a steam drum, a steam collector, a boiler body, and a pressure-bearing shell. The entire boiler body is housed within the circular pressure-bearing shell, while the steam drum and steam collector are located outside the shell and connected to the boiler body inside the shell via connecting pipes. The pipes are sealed at their penetration points into the shell. The boiler body is divided into upper and lower sections. The upper high-temperature zone is surrounded by a constant-temperature membrane water-cooled wall, while the lower low-temperature zone is constructed from welded steel plates. Two gas outlets connect the lower flue outlet to the pressure-bearing shell, forming a connecting layer. The inner wall of the pressure-bearing shell is insulated. A high-temperature superheater, a low-temperature superheater, and an evaporator are sequentially arranged at the top of the boiler body, while an economizer is arranged at the bottom. This utility model solves the problem of arranging the pressure-bearing and heating surfaces in traditional boilers, offering advantages such as reduced sealing difficulty, optimized heat exchange process, pressure balance, simplified insulation, and improved safety and energy efficiency.