309 results about "Superheater" patented technology

This invention discloses a supercritical carbon dioxide cycle generator set water spray desuperheating system, comprising a supercritical carbon dioxide cycle power generation system and a water spray desuperheating system; the supercritical carbon dioxide cycle power generation system includes a heater, a screen-type superheater, a final-stage superheater, and a turbine; the water spray desuperheating system includes a first desuperheating water injection point, a second desuperheating water injection point, and a liquid-water separation system; the heater outlet is sequentially connected to the turbine inlet via the first desuperheating water injection point, the screen-type superheater, the second desuperheating water injection point, and the final-stage superheater; the turbine outlet is connected to the inlet of the liquid-water separation system; the liquid outlet of the liquid-water separation system is connected to the first and second desuperheating water injection points; and the gas outlet of the liquid-water separation system is connected to the heater inlet. This system can solve various problems caused by carbon dioxide desuperheating.

The utility model provides a peak-shaving steam supply system for deep waste heat utilization of a thermoelectric unit, which deeply recovers cold end waste heat and flue gas waste heat of a cogeneration unit, is coupled with a two-stage compression heat pump, extracts waste heat to heat demineralized water, and serves as a primary heat source for supplying industrial steam, so that the waste heat participates in external heat supply; the superheater utilizes the generating capacity of the unit to enable industrial steam to reach steam supply parameters, the waste heat of the unit and the generating capacity are combined for external steam supply, the circulating heat efficiency is improved, the steam supply capacity is improved, meanwhile, the on-grid electricity is reduced, thermoelectric decoupling is achieved, the unit adjusting operation interval is expanded, the operation cost and pollutant emission are reduced, and peak regulation or spot transaction earnings are improved. And a clean, low-carbon, flexible, efficient, economical and energy-saving combined heat and power generation system is constructed.

The invention discloses a fused salt steam generation system and a control method thereof. A high-temperature molten salt tank, a salt feeding pump, a molten salt channel of a second-stage superheater, a molten salt channel of a first-stage superheater, a molten salt channel of an evaporator, a molten salt channel of a preheater and a low-temperature molten salt tank of the system are communicated in sequence; the water supply end, the water supply pump, a steam-water channel of the preheater, the steam pocket, the pressure regulating valve, a steam-water channel of the first-stage superheater, the water spraying and temperature reducing device, a steam-water channel of the second-stage superheater and the steam removal end are sequentially communicated, and a descending pipe and an ascending pipe of the steam pocket are communicated with a steam-water channel of the evaporator. The control method aims at the system. The method has the advantages that the steam pocket pressure is actively adjusted during load rising, the liquid working medium is flashed, a load instruction can be quickly responded, steam is stably generated according to the instruction and merged into the steam turbine, and the stability and safety of the steam turbine are improved; the steam pocket of the evaporation system is used as steam storage equipment, so that an independent steam storage pocket is prevented from being arranged in the evaporation system, the cost is reduced, and the control logic is simplified.

The invention discloses a thermal power generating unit boiler wall temperature early warning method and device, and the method comprises the steps: determining a steady-state working condition according to boiler operation parameters; the boiler operation parameters comprise coal feeding quantity, water feeding quantity, primary air quantity and secondary air quantity; calculating the wall temperature change rate of each monitoring point in a preset time window; the time window is set according to a data smooth filtering requirement and an early warning response timeliness requirement, and the monitoring points comprise a superheater, a reheater and a water cooling wall; and if the wall temperature change rate of at least one monitoring point is greater than or equal to a preset early warning threshold value and the duration is greater than or equal to a corresponding time threshold value, executing a corresponding early warning strategy. Whether the boiler is in the steady-state operation state or not is recognized before early warning is triggered, so that wall temperature fluctuation interference in the normal dynamic process such as unit load adjustment and combustion working condition fine adjustment is eliminated, it is avoided that the normal working condition is misjudged to be abnormal, the early warning timeliness of the wall temperature of the boiler is improved, meanwhile, the misjudgment rate is reduced, and the early warning accuracy is improved.

The invention relates to a method for detecting microcracks on the inner wall of a wall enclosure superheater of a boiler. The method comprises the following steps: macroscopically identifying and preliminarily screening a high-risk area; creating an endoscope channel based on the primary suspicious area list and performing primary peeping on the inner wall; carrying out detection surface preparation and acoustic coupling optimization; data acquisition is carried out through accurate arrangement of the small-sound-velocity self-coupling phased array ultrasonic probe; extracting defect signal features and carrying out three-dimensional digital modeling; performing crack depth accurate quantization based on a time of flight diffraction mode; carrying out comprehensive data analysis and evaluating a security level; and integrating detection results, and generating a digital file based on the results. According to the invention, standardization of the detection process and systematization of data management can be realized, the detection efficiency and accuracy are greatly improved, a scientific basis is provided for equipment life prediction and maintenance decision, and the safe operation level of the boiler is effectively improved.

The embodiment of the present disclosure provides a molten salt-based gas-steam combined heat storage system and a capacity calculation method. The system comprises a gas turbine, a boiler, a gas heat exchanger, a steam heat exchanger, a high-temperature molten salt storage tank and a low-temperature molten salt storage tank. The outlet of the gas turbine is connected with the inlet of the flue of the boiler. The gas heat exchanger is connected with the flue between the gas turbine and the high-temperature reheater and the high-pressure superheater in the boiler. The steam heat exchanger is connected with the steam-water pipeline between the high-pressure superheater and the high-pressure drum and the low-pressure drum in the boiler. The low-temperature molten salt storage tank is connected with the high-temperature molten salt storage tank through a molten salt conveying pipeline. The molten salt conveying pipeline is sequentially connected with the steam heat exchanger and the gas heat exchanger. The low-temperature molten salt is heated to high-temperature molten salt when passing through the steam heat exchanger and the gas heat exchanger along the molten salt conveying pipeline. The system realizes reasonable distribution of steam flow and gas flow, significantly improves the heat exchange efficiency of the heat storage heat exchanger, improves the energy storage density per unit mass of the molten salt heat storage system, and reduces the cost.

The invention relates to an electric heating fused salt heat storage-heat supply system for quickly absorbing wind and light output fluctuation. The electric heating fused salt heat storage-heat supply system comprises a low-temperature fused salt tank, a high-temperature fused salt tank, a multi-stage electric heater array, a fused salt pump, a regulating valve, a switch valve, a temperature measuring point, a preheater, an evaporator, a superheater, a water supply pump, a water supply unit and a matched pipeline. The system adopts hierarchical control: a first-stage electric heater array operates at a constant flow within a set time so as to respond to power fluctuation from a second stage to a minute stage; and the second-stage electric heater array is used for coping with minute-level to hour-level power fluctuation by adjusting the flow of the molten salt and stabilizing the temperature of a molten salt outlet. In the occasion where the temperature of the high-temperature molten salt needs to be strictly controlled, the system can guarantee the temperature quality of the high-temperature molten salt by additionally arranging a molten salt loop. The heat sink effect of the molten salt in the low-temperature molten salt tank can effectively buffer temperature sudden change and stabilize a flow field. Qualified high-temperature fused salt can be continuously output under high-fluctuation electric energy input, and steam is stably supplied.

This invention discloses a novel, low-load, high-efficiency thermoelectric decoupling heating system. The system is characterized by replacing the high-pressure bypass section with an extraction section. This extraction section extracts steam from the middle of the superheater and uses this steam to heat the secondary air or drive the induced draft fan. Compared to existing technologies, this invention, after heating the secondary air or driving the induced draft fan, returns the steam to the cold section, thus overcoming the problem of limited extraction capacity in conventional systems. It also allows for changes in the coal-to-water ratio within the boiler under low load conditions, increasing the outlet steam temperature of the superheater and reheater under low load conditions, and avoiding the widespread problem of underheating of main steam and hot reheat steam under low load conditions.

The invention relates to the technical field of tee joint repairing, and particularly discloses a final-stage superheater tee joint repairing device and method.The method comprises the steps that magnetic powder detection and phased array ultrasonic detection are adopted, defective weld joints of a final-stage superheater tee joint are detected, and the number, length and depth of crack defects are determined; on the basis of defect conditions detected in magnetic powder detection and phased array ultrasonic detection, a defect elimination mode is evaluated, and a U-shaped repair welding groove is prepared by polishing an area subjected to defect elimination; u-steel is adopted for fixing the positions, 2000 mm away from the two sides of a tee joint of the superheater tee joint collecting box, of the tee joint, and meanwhile a connecting pipe, connected with a main steam pipeline, of the tee joint is fixed to the position 300-350 mm away from a large cover wall; compared with the conventional single detection means, the combined detection mode of magnetic powder detection and phased array ultrasonic detection can comprehensively confirm the number, length, depth and specific position of crack defects, avoids the defect which is left in a detection blind area and is not cleared, and reduces the risk of secondary cracking after repair from the source.

The present application relates to a kind of tail flue and the flue gas outlet of combustion device are communicated boiler system and a kind of operation method of boiler system, the boiler system includes: boiler, is provided with heating surface, the heating surface includes the low-temperature superheater and / or low-temperature reheater being arranged in the tail flue of boiler;And combustion device, the combustion device is provided with combustion space independent of boiler furnace, the flue gas outlet of combustion space is communicated with tail flue, and the position communicated with tail flue is in the flow direction of boiler flue gas upstream low-temperature superheater and / or low-temperature reheater.The present application also relates to a kind of boiler-turbine equipment.

This utility model discloses a regenerated steam superheating system for an energy-saving steam oven, including a superheater, a regenerated steam device, and a water supply pipeline. The superheater is equipped with a high-temperature, high-pressure steam outlet, and the regenerated steam device is equipped with a high-temperature, high-pressure steam inlet and a regenerated steam outlet. The high-temperature, high-pressure steam outlet is connected to both the high-temperature, high-pressure steam inlet and the water supply pipeline via a gas-liquid separator. The water supply pipeline is connected to the regenerated steam device, and the regenerated steam outlet is connected to the superheater. This utility model uses high-temperature, high-pressure steam as a heat source to heat the regenerated steam in the superheater, and separates the vapor phase of the high-temperature, high-pressure steam, returning it to the regenerated steam device for power steam recycling. The heated regenerated steam significantly reduces its moisture content while increasing its temperature. Compared with the prior art, the regenerated steam superheating system of this utility model produces steam with low moisture content and high temperature, meeting the specific process requirements of crispy noodle production.

The application discloses a steam temperature control method and device, a storage medium and an electronic device, relates to the technical field of control, and the method comprises the following steps: acquiring the current steam flow of a boiler, the current swing angle of a burner and the current flue gas temperature of a superheater inlet in a steam temperature control system of a thermal power plant; acquiring a superheater inlet and outlet enthalpy increase model; calculating the current steam flow, the current swing angle and the current flue gas temperature according to the superheater inlet and outlet enthalpy increase model to obtain the first inlet and outlet enthalpy increase of the superheater; calculating according to the first inlet and outlet enthalpy increase to obtain a target temperature value of the superheater inlet, and controlling the steam temperature of the superheater inlet according to the target temperature value. Through the application, the problem that the steam temperature is adjusted by a PID controller in the related art, resulting in relatively low accuracy of steam temperature control, is solved.

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.

The invention relates to the technical field of boiler equipment, in particular to a detachable layered shell electrode type boiler superheater which comprises a bottom frame, stand columns, coiled pipe discs, a mounting frame, a supporting frame, an air inlet pipe and an air outlet pipe, the bottom frame is of a square rigid structure, the stand columns are connected to the four corners of the bottom frame, and the coiled pipe discs are steam circulation pipe bundles; five coiled pipe discs are arranged in a layered mode in the vertical direction, the installation frame is assembled between the two symmetrical stand columns in a sliding mode, the supporting frames are arranged in a layered mode in a pairwise opposite attaching mode and support and limit the coiled pipe discs on each layer, and arc-shaped grooves are formed in the installation frame at intervals. The coiled pipe disc adopts a layered detachable design and is independently limited and fixed by the mounting rack, when the outer wall of the pipe disc is coked or accumulated with dust, the connection can be conveniently removed, and the mounting rack can be disassembled along the upright post, so that the single-layer or multi-layer pipe disc can be independently cleaned or replaced, the maintenance difficulty and the workload are obviously reduced, and the working efficiency is improved. And the long-term heat exchange efficiency and the operation safety of the superheater can be effectively ensured.

The invention discloses an industrial steam extraction combined heat and power generation frequency modulation system and an industrial steam extraction combined heat and power generation frequency modulation method adapting to a variable load condition, and relates to the technical field of combined heat and power generation. The problems that the heat storage capacity is limited and the frequency modulation capacity is low due to the fact that only reheating hot section steam is utilized at the present stage are abandoned, and in the sliding temperature operation mode, due to the fact that the temperature of main steam and the temperature of reheating steam can be changed by unit variable loads, the change trend of the steam extraction amount is completely opposite to the steam extraction temperature in the frequency modulation process, and the heat storage capacity is limited. Therefore, the outlet temperature of the heated molten salt is controlled by changing the sensible heat exchange amount of the main steam superheating heat exchanger and the reheating hot section steam superheating heat exchanger, and through the control strategy that the temperature is dynamically adjusted to be stable through the flow branches and the molten salt flow distribution of the main steam superheating heat exchanger and the reheating hot section steam superheating heat exchanger, the heat exchange efficiency of the molten salt is improved. The stability of the temperature of the heat storage medium in the heat storage process is greatly improved, and finally efficient operation of the system is achieved.

The utility model provides a full fresh air anti-condensation circulating system for an anti-explosion refrigeration house. Belongs to the technical field of refrigeration engineering. The all fresh air anti-condensation circulation system comprises a PLC (programmable logic controller), a refrigerating device, a fresh air device, an exhaust device, an air supply device, a defrosting air device and a heat exchanger. Wherein the fresh air inlet assembly is sequentially connected with the heat exchanger, the fresh air check valve and a fresh air inlet of the evaporation chamber through a fresh air pipe, and the superheater is located in the fresh air pipe connecting the heat exchanger and the fresh air check valve; an exhaust air outlet of the explosion-proof refrigeration house is sequentially connected with a first exhaust air check valve, an exhaust air fireproof valve, a heat exchanger, an exhaust air fan, a second exhaust air check valve and an exhaust air outlet assembly through an exhaust air pipe, and a subcooler is located in the exhaust air pipe. By means of the full fresh air design, the efficient heat exchange and supercooling technology, intelligent control and the like, the anti-condensation and anti-explosion safety problems in the anti-explosion refrigeration house are solved, and the energy efficiency level and the operation reliability of the system are remarkably improved.

The application provides a control system and method for medium-pressure steam admission in a gas-steam combined cycle unit, comprising a medium-pressure water extraction pump, a superheater, a medium-pressure bypass regulating valve, a condenser, a medium-pressure steam regulating valve, a reheater and a steam turbine, the medium-pressure water extraction pump is connected with the superheater through a pipeline, the water outlet of the superheater is connected with the condenser and the medium-pressure cylinder of the steam turbine through pipelines, the medium-pressure bypass regulating valve is arranged on the pipeline corresponding to the condenser, the medium-pressure steam regulating valve is arranged on the pipeline corresponding to the steam turbine, and the reheater is arranged between the medium-pressure steam regulating valve and the steam turbine. The control system and method for medium-pressure steam admission in the gas-steam combined cycle unit can maintain the medium-pressure drum liquid level in a safe liquid level range through the medium-pressure feedwater regulating valve, realize automatic control during medium-pressure steam admission through the opening and closing of the medium-pressure steam regulating valve and the medium-pressure bypass regulating valve, and reduce misoperation.

The application discloses a heat-accumulating type steam and hot water cogeneration waste heat boiler system, which comprises a waste heat boiler body, a heat-accumulating type heat medium water system and related control valves. The waste heat boiler can absorb waste heat of flue gas to obtain hot water with different temperatures. Steam generated by vaporization and separation of superheated water in a steam drum can enter a steam pipe network after being heated by a heater to supply high-temperature users. Water with low enthalpy can be output by the heat-accumulating type heat medium water system to supply production and living hot water required by low-temperature users. The hot water is pumped back to the waste heat boiler body by a hot water circulating pump / booster after being cooled, and is heated by low-temperature flue gas, so that the exhaust gas temperature of the waste heat flue gas is further reduced, and the utilization efficiency of the waste heat is improved. The application realizes steam and hot water cogeneration functions of the waste heat boiler, outputs high-quality steam, and outputs high-temperature hot water with required temperature and pressure of users, and has simple control, high stability and high precision, and meets the requirements of fine production and life.

The application discloses a drainage system applied to flexible operation of a supercritical coal-fired boiler. The application is characterized in that a temperature sensor group and a drainage pipe are arranged on a lateral wall inlet header of a horizontal flue, and an electric regulating valve on the drainage pipe is controlled according to a first temperature signal and a second temperature signal measured by the temperature sensor group and a main steam pressure signal and a main steam flow signal taken from a boiler automatic control system, so that the condensed accumulated water in the header is discharged to a boiler drainage expander through the drainage pipe, and the condensed accumulated water in the inlet header of the superheater is prevented from causing water blockage in the header, thereby ensuring normal use of the pipeline and safe operation of the boiler.

The application discloses a kind of low NOx emission combustion control method of alkali furnace based on flue gas recirculation.The method is transported to the third air duct by induced draft fan after part of flue gas after dust removal, and air-gas mixture is formed after mixing with air, and is injected into the hearth from the alkali furnace third air distribution port.The application obtains the temperature field, concentration field and thermal efficiency in the furnace by establishing the geometric structure model and numerical calculation model of alkali furnace, and obtaining by CFD calculation;By adjusting different flue gas recirculation rates, the influence of flue gas recirculation rate on the temperature field, concentration field and thermal efficiency in the furnace is simulated, and the optimized flue gas recirculation rate is obtained.The application can reduce the oxygen content of the third air, reduce the generation of NOx in the high-temperature combustion zone, reduce pollution emissions, at the same time, the increased recirculation flue gas flow is beneficial to reduce the temperature of the lower part of the superheater, and relieve high-temperature thermal stress corrosion.

The invention relates to the technical field of thermal power generation, and discloses a coal-fired power plant final-stage superheater wall temperature prediction method and system based on an improved wavelet time convolution network, and the method comprises the steps: obtaining the historical operation data of a plant-level monitoring information system, calculating the maximum information coefficient between each variable and the wall temperature, and obtaining the maximum information coefficient; selecting a variable with the maximum information coefficient greater than a preset threshold value as a key feature; constructing the key features and the wall temperature data at the current moment and the plurality of historical moments into model input features, and taking the wall temperatures at the plurality of future moments as model output features; constructing a wavelet time convolutional network model, wherein the wavelet time convolutional network model comprises an input layer, a wavelet decomposition layer, at least one hybrid expansion convolutional layer and an output layer which are connected in sequence; and training the wavelet time convolutional network model by using the model input features and the model output features to obtain a wall temperature prediction model. According to the method, the wall temperature of the final-stage superheater is predicted, an operator can take control measures in advance, and the overtemperature phenomenon is reduced.

The invention discloses a heat treatment method and device for a nickel-based alloy for a 700 DEG C advanced ultra-supercritical unit, and aims at an aging strengthening type nickel-based high-temperature alloy, only a solid solution heat treatment step before operation is reserved, and an aging heat treatment step in standard heat treatment is cancelled. The alloy is subjected to aging strengthening in the service process close to the aging temperature (650-850 DEG C) (not less than 1000 hours), the solid solution heat treatment temperature is controlled to be 1050-1150 DEG C, heat preservation is conducted for 1-3 hours, and water cooling or air cooling is adopted as the cooling mode. Impurities on the surface of the alloy are cleaned before solid solution heat treatment, parameters such as temperature, stress and strain are monitored in real time during operation of a unit to optimize the aging process, the process is simplified, the cost is reduced, and the production efficiency is improved while the lasting creep property of the alloy is guaranteed. And the field availability of the large alloy pipe fitting in preparation and installation of equipment such as a 700 DEG C advanced ultra-supercritical thermal power generation superheater and a reheater is improved.

This application discloses a steam-water system and method for extending the hot standby period of a circulating fluidized bed (CFB) unit, comprising: a boiler and an external bed assembly. The external bed assembly includes at least one external bed unit, each external bed unit including multiple external beds connected in series or parallel, with each external bed corresponding to a cyclone separator. Each external bed unit includes a superheater external bed unit, the external bed of which has a second superheater. The first superheater is one of a medium-temperature superheater and a high-temperature superheater, and the second superheater is the other of a medium-temperature superheater and a high-temperature superheater. A high-temperature reheater is installed inside the furnace. Alternatively, the external bed unit includes a superheater external bed unit and a high-temperature reheater external bed unit, the external bed of which has a high-temperature reheater. This system can extend the hot standby period of a CFB unit, achieving a smooth transition from a hot standby state to a high-load operation state.

The application discloses a solid waste heat storage system of a CFB boiler based on flue gas heating and a method thereof. The solid waste heat storage system of the CFB boiler based on flue gas heating comprises a coal-fired boiler system and a solid waste heat storage device. The solid waste heat storage device comprises a solid waste heat storage layer and a heat exchange pipeline which can exchange heat with each other. The heat exchange pipeline comprises a flue gas heat exchange pipeline, a first steam heat exchange pipeline and a second steam heat exchange pipeline. The flue gas pipeline is arranged in parallel with a cyclone separator and a fourth valve. The first steam heat exchange pipeline is arranged in parallel with a superheater and a first valve. The second steam heat exchange pipeline is arranged in parallel with a reheater and a second valve. According to the solid waste heat storage system of the CFB boiler based on flue gas heating, when the boiler enters a fire pressure operation state, the main steam and the reheated steam are heated by the solid waste heat storage layer, and the fire pressure time length of the boiler is prolonged.

The denitration and dust removal integrated biomass grate boiler comprises a second flue, a third flue and a fourth flue which are sequentially connected with an outlet of a hearth, the lower end of the second flue is communicated with the lower end of the third flue, and the upper end of the third flue is connected with the upper end of the fourth flue through a furnace top turning flue. A first platen superheater is arranged at the upper part of the hearth, a second platen superheater is arranged in the second flue, a coiled pipe superheater is arranged in the third flue, and denitration equipment, an economizer and a tail heating surface are sequentially arranged in the fourth flue according to the flowing direction of flue gas; dust removal equipment is arranged in the furnace top turning flue, and the dust removal equipment and denitration equipment are supported on a boiler body steel frame. The dust removal equipment and the denitration equipment are also arranged in the range of the boiler body, so that compared with the prior art, the lengths of the inlet flue and the outlet flue are greatly shortened, the heat dissipation loss is reduced, the boiler efficiency is improved, and the dust removal and denitration effects can be improved; and the floor area is small, and the construction cost is low.

The application provides a mobile electrode boiler system, which comprises an electrode boiler mobile unit and a water supply and heating mobile unit, the electrode boiler mobile unit comprises a boiler body module, a dosing device and a high-voltage power distribution module, the water supply and heating mobile unit comprises a boiler water supply pump module, a boiler circulating pump module, an electric heating superheater module and a low-voltage power distribution module; the solution tank of the dosing device is connected with desalted water and reagents on the user side, the outlet of the dosing device is connected with a boiler water supply port of the boiler body module, the outlet of the boiler water supply pump module is detachably connected with the boiler water supply port, the boiler circulating pump module is detachably connected with the boiler body module, and the inlet of the electric heating superheater module is detachably connected with a saturated steam or hot water outlet of the boiler body module through a steam pipeline, and the superheated steam outlet or the saturated steam and hot water outlet of the electric heating superheater module is connected with the user side. The system can be directly placed on a platform or a vehicle for use, does not need welding work on site, and can be transferred to a use site by using a vehicle.

A boiler structure with the heating surface above the evaporator. Leakage in the four-tube structure of a waste heat boiler in a gas-steam combined cycle unit refers to the rupture and leakage of the four types of heating surface tubes (evaporator, superheater, reheater, and economizer) due to overheating, corrosion, wear, fatigue, or other reasons, leading to tube failure and potentially boiler accidents. This invention includes a first tube screen and a second tube screen, connected to an inlet header and an outlet header respectively via connecting pipes. The first tube screen has two rows of first heating surfaces, and the second tube screen has two rows of second heating surfaces. Both the first and second heating surfaces include multiple straight tube rows and multiple bent tube rows. The bent tube rows of the first and second heating surfaces are aligned and symmetrically bent. This invention is used for boilers with the heating surface above the evaporator.

The utility model discloses a waste incineration waste heat boiler desuperheating water position adjusting device, and relates to the technical field of waste incineration waste heat boiler desuperheating water position adjusting. A gate valve and a tee joint are connected into a superheater connecting pipe for connecting a low-temperature superheater I, a medium-temperature superheater I and a medium-temperature superheater II. The flow direction of steam in the pipeline is adjusted through opening and closing of the gate valve, so that the access position of the attemperation water is adjusted, and the position of the attemperation water is adjusted from the original position between the low-temperature superheater I and the medium-temperature superheater I to the position between the medium-temperature superheater I and the medium-temperature superheater II. After the steam superheat device is adopted, the steam superheat degree of the outlet of the medium-temperature superheater I is improved compared with that of the outlet of the low-temperature superheater I, and the problem that the steam superheat degree is not enough when the desuperheating water amount at the outlet position of the low-temperature superheater I is too large is effectively solved. And meanwhile, the medium-temperature superheater I is reduced behind the desuperheater, and the steam is not easy to overheat at the outlet of the medium-temperature superheater II, so that the adjusting efficiency of the boiler is improved, and the safe operation of the boiler is guaranteed.

The application relates to a combined steam supply system. The system comprises a boiler, a steam turbine generator unit, and a steam supply water pump, a steam supply heater, a steam drum and a steam supply superheater connected in sequence; the steam supply superheater is arranged in the boiler, the steam supply heater is connected with the steam turbine generator unit; the steam supply water pump is used for obtaining steam supply water and adjusting the steam supply pressure of the steam supply water; the steam supply water pump is also used for transmitting the adjusted steam supply water to the steam supply heater; the steam supply heater is used for obtaining heat from a steam extraction process of the steam turbine generator unit, heating the adjusted steam supply water to obtain a steam-water mixture; the steam drum is used for flash evaporation and steam-water separation of the steam-water mixture to obtain saturated steam; and the steam supply superheater is used for heating the saturated steam based on heat obtained from the boiler to obtain steam for supply. The method can reduce resource waste.

The utility model provides an air pocket steam superheating treatment device which comprises a gasification furnace, saturated steam, a boiler water pipeline, a boiler water circulating pump, a medium-pressure air pocket, a steam emptying pipe, saturated steam, a steam emptying pipe, a superheated steam pipe network, a synthesis tower and a steam superheater, the saturated steam comes from synthesis, and the saturated steam comes from conversion, saturated steam is connected with the middle of the gasifier; the upper part of the medium-pressure air bag is connected with saturated steam; a boiler water pipeline is connected with the lower part of the medium-pressure air pocket; a boiler water pipeline is connected with the upper part and the middle part of the gasifier after passing through a boiler water circulating pump. According to the steam superheat treatment device for the air pocket, the load of the thermoelectric boiler can be reduced by improving the superheat degree, so that the use amount of fuel coal is reduced.