51results about How to "Increase smoke temperature" patented technology

The invention discloses a desulfurization-denitrification-dedusting integrated device of a coke oven, and relates to the technical field of the flue gas treatment. The desulfurization-denitrification-dedusting integrated device of the coke oven comprises a flue gas system, a desulfurization system, a dedusting system and a denitrification system which are successively connected. The outlet of thedenitrification system is connected with a chimney through a draught fan. The desulfurization-denitrification-dedusting integrated device of the coke oven further comprises a flue gas reheating systemand a flue gas heating device. The outlet of the flue gas heating device is connected with the denitrification system, and the inlet of the flue gas heating device is connected with the outlet of theflue gas reheating system and the outlet of the dedusting system. The inlet of the flue gas reheating system is connected with the outlet of the draught fan. The desulfurization-denitrification-dedusting integrated device of the coke oven is suitable for the flue gas treatment of the coke oven, and has the advantages of small pollution, complete purification, low cost, long service life and the like.

The invention discloses a regenerative system of a turbogenerator unit and an operation method thereof. The system comprises a high-pressure cylinder and a high-pressure heater, wherein an steam exhaust port and a plurality of high-pressure steam extraction ports whose steam extraction pressure is increased sequentially are formed in the high-pressure cylinder, the high-pressure steam extraction ports are connected with the same high-pressure heater through high-pressure steam extraction pipelines, and an extraction check valve and an isolated valve are arranged on each high-pressure steam extraction pipeline. When the turbogenerator unit operates at a rated load, a first high-pressure steam extraction port with the lowest steam extraction pressure supplies steam for the high-pressure heater, and the steam extraction pressure at the time is set to be P0; when the turbogenerator unit operates in a state lower than the rated load, a high-pressure steam extraction port with steam extraction pressure less than or equal to P0 or closer to P0 is selected to supply steam for the high-pressure heater, and the isolated valves on other high-pressure steam extraction pipelines are switched off. According to the regenerative system of the turbogenerator unit and the operation method thereof, a denitration system can operate normally when the unit operates at a low load, the boiler feeding temperature is increased, and the thermodynamic cycle efficiency of the unit is improved accordingly.

The invention relates to the field of smoke exhaust waste heat utilization of a boiler, and particularly discloses a combined air supply heating depth waste heat recycling system of a low-low-temperature economizer of a coal-fired unit. The waste heat recycling system is characterized in that a low-low-temperature economizer high-temperature segment is arranged in a front flue of an electrostatic precipitator, and a low-low-temperature economizer low-temperature segment is arranged at the position from an induced draft fan outlet to a desulfurizing tower inlet flue; the low-low-temperature economizer high-temperature segment is connected with a condensate pipeline of a condenser, and the low-low-temperature economizer low-temperature segment is in parallel connection with a primary air heater and a secondary air heater through low-low-temperature economizer low-temperature segment water outlet pipelines; and the water outlet pipeline of the primary air heater and the water outlet pipeline of the secondary air heater are communicated with a low-low-temperature economizer low-temperature segment water returning pipeline of the low-low-temperature economizer low-temperature segment. The temperature of the smoke of the desulfurizing tower inlet is reduced to about 50 DEG C, coal saving benefits are obtained, meanwhile, the water consumption of a desulfurizing tower is reduced, and the whole running benefits of a power plant is greatly improved.

The invention provides a system unit for increasing the temperature of an SCR reactor. The system unit comprises a boiler reversing chamber and a coal economizer, and is characterized in that at the boiler reversing chamber, two bypass pipelines are connected to an inlet flue of the SCR reactor at the outlet of the coal economizer. According to the system, by utilizing pressure difference formed between different heated surfaces of a boiler in operation, about 510 to 550 DEG C of medium-temperature flue gas is sucked from the boiler reversing chamber, is divided and sent to the two bypass pipelines, and is connected to and enters the inlet flue of the SCR reactor at the outlet of the coal economizer. The amount of the sucked flue gas is not more than 10% of the total amount of the flue gas under the load, and the suction amount is relatively moderate, so boiler water supply and main reheated steam temperature are barely affected.

The invention discloses a power station boiler system and a method for increasing the tail fume temperature of a power station boiler by integrating supplemental combustion for biomass gasification. According to the method, one or more fixed bed biomass gasifiers are additionally arranged, the gasifiers maintain the rated loads to continuously and stably operate, and hot primary air of the boiler is used as a gasification agent to promote the gasification efficiency of the gasifiers and increase the heat value of gasified gas; when the boiler operates with the low load, the biomass gasified gas is delivered into a flue behind a coal economizer or a steering fume chamber in front of the coal economizer, and the fume temperature at an outlet of the coal economizer is increased through supplemental combustion of the biomass gasified gas, so that a selective catalytic reduction fume denitration system operates safely and stably; supplemental-combustion gas is reduced correspondingly along with increasing of the loads, and the reduced gasification gas for supplemental combustion is delivered into the upper portion of a hearth so as to be combusted, and when the boiler operates with the full load, all the biomass gasified gas is delivered into the upper portion of the hearth so as to be combusted; and supplemental-combustion temperature increasing of the tail fume of the power station boiler is finally achieved through biomass resources, and meanwhile, the biomass resources can be further efficiently used for power generation.

The invention discloses a superheated steam temperature adjusting system and method suitable for SCR low-load operation. The system comprises a bypass system arranged between a low-temperature superheater outlet header and a first stage spray type desuperheater, a feed water heater arranged in front of an economizer inlet header, various pipes and valves, and the various pipes and the valves are connected with the steam temperature adjusting system. The steam flow of a low-temperature superheater is adjusted by adjusting the opening degrees of valves of the bypass system, so that part of superheated steam is used for heating economizer inlet fed water, the economizer inlet water temperature is increased, the heat exchange amount of an economizer system is reduced so as to control the fume temperature at an economizer outlet, and the fume temperature which does not reach the SCR operation condition originally at low load can meet the temperature requirement of SCR operation. The problem that a power plant SCR denitration system cannot be operated at low load is solved, and it is guaranteed that emission of nitric oxides in the full-load operation of a power plant meets the requirements.

The invention provides an on-line sampling device and method for sulfur trioxide to reduce the human operation error of sampling personnel and improve the sampling accuracy. The device comprises a low-temperature absorber, an isopropanol sampling liquid extraction system and an air extraction system; the air extraction system comprises a gas-liquid separator, a gas mass flow meter and an air pump,wherein the gas mass flow meter and the air pump are successively connected to a gas outlet of the gas-liquid separator; the low-temperature absorber comprises an isopropanol absorption liquid bottle, a flue gas input pipe and a flue gas output pipe; the isopropanol absorption liquid bottle is filled with isopropanol absorption liquid and placed in an environment of -2 to 2 DEG C; the input end of the flue gas input pipe is connected with a heating gun, and the output end is inserted into the absorption liquid; the output end of the flue gas output pipe is higher than a set absorption liquidlevel, and the output end is connected with a gas inlet of the gas-liquid separator; the isopropanol sampling liquid extraction system includes an isopropanol sampling liquid output pipe, a suction peristaltic pump and a sampling collector which are successively connected to the bottom of the isopropanol absorption liquid bottle.

The invention relates to an economizer hot water recirculation system applicable for a subcritical steam drum boiler generator set, and a working method thereof. The hot water recirculation system comprises an economizer, a steam drum, a drop pipe and a water supply pipe, and a water outlet of the economizer, the steam drum and the drop pipe communicate with each other in sequence; the water supply pipe communicates with an inlet of the economizer; the hot water recirculation system further comprises a No.1 electric regulating valve, a No.2 electric regulating valve, a manual shutoff valve, aNo.1 check valve, a No.2 check valve, a circulating pump, a recirculation pipe and a bypass; the recirculation pipe communicates with a lower collection box of the drop pipe, and further communicateswith an inlet collection box of the economizer at the time; the recirculation pipe is provided with the circulating pump of which the both sides are provided with the No.1 electric regulating valve and the manual shutoff valve; the circulating pump is provided with the bypass which is provided with the No.2 electric regulating valve; and the recirculation pipe is provided with the No.1 check valve, and the water supply pipe is provided with the No.2 check valve. The hot water recirculation system can be used for preventing the economizer from being dry-burnt in the start-stop process, and improving the outlet smoke temperature of the economizer under the low load condition, so that the wide load denitrification is achieved.

The invention provides a large pulverized coal boiler ultralow-load coal economizer switching bypass system. The system mainly solves the problem of low-temperature corrosion risk of a cold end and atail flue of an air preheater. The system is characterized in that firstly, a bypass pipeline valve is opened, then a water supply pipe valve and a downcomer valve are closed, a hydrophobic valve is opened, residual boiler feedwater in a coal economizer is introduced into a boiler hydrophobic system to be recycled through a coal economizer drain pipe, the boiler feedwater enters the downcomer through a bypass pipeline, and the boiler feedwater does not absorb the flue gas heat through the coal economizer, so that the temperature of the flue gas at an outlet of the coal economizer can be increased by 60-80 DEG C. According to the system, the connecting mode is relatively simple and convenient, only certain pipeline equipment needs to be additionally arranged, the equipment investment is saved, the usability of a SCR of a ultralow-load denitration device is enhanced, the lowest load of the boiler can meet the lowest commissioning flue gas temperature condition of the SCR of the denitration device at 15% BMCR.

The invention relates to a waste incineration waste heat boiler system with a flue gas reheating function. The waste incineration waste heat boiler system is characterized in that the waste incineration waste heat boiler system comprises a first flue to an N flue sequentially arranged in the flue gas flowing direction, the Nflue is a horizontal flue defined by superheaters in a surroundingmode, and a water-cooled evaporation screen, the first-level second superheater, the third-level superheater, a second-level reheater, the second-level second superheater, the second-level first superheater and the first-level first superheater are sequentially arranged in the horizontal flue; and the N flue communicates with a tail front flue, the tail front flue is connected with a tail rear flue in series, the tail front flue and the tail rear flue are composed of surrounding plates, and a first-level reheater and an economizer are arranged in the tail front flue and the tail rear fluecorrespondingly. The fume temperature in the area where a first-level reheater is located is low, and the first-level reheater is arranged in the tail flue composed of the surrounding plates, so thatcompared with the scheme that all convection heating surfaces are arranged in the horizontal flue, the floor space can be saved.

The invention discloses an economizer increasing the fume temperature at an SCR inlet by changing areas and flowing modes. A bypass is arranged on a water supply pipe connected with an economizer inlet header and is divided into two branch pipes, the first branch pipe is connected with economizer coiler headers, and the second branch pipe is directly connected with an economizer outlet header. Stop valves and flow regulating valves are sequentially arranged in the two branch pipes in the flowing direction of fluid correspondingly. The heating areas of economizer sets are regulated by regulating the valves of the first branch pipe, so that the heat exchange amount of an economizer system is reduced so as to control the fume temperature at an economizer outlet; and the flowing modes of fume and water are changed by regulating the valves of the second branch pipe, the low-load working condition which does not reach the SCR operation condition originally can meet the temperature requirement of SCR operation, and the continuous operation time of a power plant SCR denitration system is effectively prolonged. The activity of an SCR catalyst is improved due to increase of the fume temperature in the SCR system under the low-load working condition, so that the denitration capacity of the SCR system is improved.

The invention provides a control method of using a denitration device in a thermal power generating unit starting stage before synchronization. The coal feeding amount during normal operation of the thermal power generating unit is limited to be a first coal feeding amount, the coal feeding amount of the thermal power generating unit in the starting stage is a second coal feeding amount, the second coal feeding amount is larger than the first coal feeding amount, so that flue gas temperature of a boiler outlet is improved. The method is simple and easy to implement, economical, environment-friendly, safe, and reliable; and on the premises that any new equipment is not added and system improvement is not needed, only the operation of the unit is adjusted, the temperature of the flue gas atan inlet of SCR can be effectively improved, the emission amount of the flue gas nitrogen oxide of a boiler is reduced, and the method is green and environment-friendly.

The invention discloses a coal economizer water temperature adjusting system for denitration input in the unit starting process. The system comprises a platen superheater, a high-pressure main steam valve, a high-pressure regulating valve, a high-pressure cylinder, a high-pressure bypass, a low-temperature reheater, a regulating valve, a second electric valve, a first high-pressure heater, a high-pressure cylinder steam exhaust check valve, a low-temperature reheater, a second-section steam extraction check valve, a first electric valve, a second high-pressure heater, a first-section steam extraction check valve, a first-section steam extraction electric valve, a high-temperature reheater, a medium-pressure main steam valve, a medium-pressure cylinder, a low-pressure bypass, a condenser, athree-section steam extraction check valve, a three-section steam extraction electric valve, a third high-pressure heater, a four-section steam extraction check valve, a four-section steam extractionelectric valve, an auxiliary steam header, a secondary economizer and a denitration reactor. The system can reduce nitrogen oxide emission in the starting stage.

The invention discloses a coal economizer water temperature adjusting system under the full-load denitration working condition. The coal economizer water temperature adjusting system comprises a turbine high pressure cylinder, a first high pressure heater, a coal economizer, a boiler and a steam increasing machine, wherein the first-section steam extracting pipeline of the turbine high pressure cylinder is connected with the steam side of the first high pressure heater; the high pressure steam inlet of the steam increasing machine is connected with the high temperature steam pipeline of the boiler; the low pressure steam inlet of the steam increasing machine is connected with the first-section steam extracting pipeline of the turbine high pressure cylinder; the mixed steam outlet of the steam increasing machine is connected with the steam side of the first high pressure heater; and boiler feedwater passes through the first high pressure heater and enters the coal economizer after beingheated and warmed by steam. The coal economizer water temperature adjusting system is small in transforming workload and low in cost; and under high load or low load of a unit, an SCR denitration device effectively runs.

The invention provides a dry and wet state undisturbed switching system suitable for a supercritical unit in a deep peak regulation state and a control method. The dry and wet state undisturbed switching system comprises a water storage tank; an outlet is connected with a T-connector; an inlet is communicated with the outlet of a separator; a hot water circulation system is communicated with the outlet of the water storage tank and is configured to circulate saturated water in the water storage tank to an inlet of an economizer by adopting a hot water circulation pump; then the saturated water flows through a water cooling wall to reach the separator to realize working medium recirculation; a water level fine adjustment system for the water storage tank comprises a deaerator and a high-pressure heater which are communicated with the outlet of the water storage tank, and is used for leading saturated water of the water storage tank into the deaerator; and the saturated water is heated by the high-pressure heater, circulated to the economizer and the water cooling wall and then reaches the separator. According to the switching system, flexible conversion of a dry state and a wet state of the unit and long-period flexible peak regulation of 20%-100% load of the supercritical unit can be achieved; safe and stable operation of the unit is guaranteed; starting time and working medium and heat emission are reduced in the starting stage of the unit; and effective heat recovery is achieved.

The invention belongs to the technical field of waste heat recovery of thermal power generation, and particularly relates to a waste heat recovery system of a phase change heat exchanger in a thermalpower generation enterprise. The waste heat recovery system comprises an air preheater, a dust remover, an induced draft fan, a desulfurization tower and a fan heater, the air preheater, the dust remover, the induced draft fan and the desulfurization tower sequentially communicate through pipelines, an air outlet of the fan heater communicates with an air inlet of the air preheater, and an air outlet of the air preheater is connected with a flue gas cooler through a pipeline, an air outlet of the flue gas cooler communicates with an air inlet of the dust remover, and an air outlet of the desulfurization tower is provided with a flue gas reheater. According to the waste heat recovery system, pollution emission can be effectively reduced, a heat exchanger after desulfurization can be added on a heat supply secondary water return side or a condensation water side, a good energy recovery effect can be achieved, waste heat can be further utilized to heat only cold air of a boiler, smoke temperature of an air preheater outlet is improved, and the utilization efficiency of thermal power generation energy is greatly improved.

The invention discloses an economizer improving the SCR commissioning rate under the low load working condition. A water supply pipeline of an inlet of the economizer is provided with a by-pass. A by-pass pipeline is connected with a middle header of the economizer. The by-pass is sequentially provided with a one-way valve, a throttling valve and a flow adjusting valve in the medium flowing direction. According to the economizer, the opening degree of a by-pass valve is adjusted under the low load condition so as to reduce medium flow between an inlet header and the middle header of the economizer in a boiler, the heat output of the smoke side of the economizer can be reduced, the smoke temperature of an outlet of the economizer rises, and the commissioning rate of a power plant SCR under the low load condition can be effectively improved; the catalyst activity of the SCR is promoted due to rising of the temperature of an SCR system, the SCR system obtains the higher denitration capacity, and therefore a power plant can meet the environmental protection index requirement better over a much longer time period.

The invention discloses a method and device for increasing the water feed temperature at medium loads and low loads of a steam turbine set. A new zero-extraction steam extraction heat regeneration module is additionally installed in front of a steam extraction point, is guided out from the new steam extraction point and is connected to an original steam extraction pipe section, when the unit load is lowered to a certain degree (about 35%-40%), the SCR entrance smoke temperature is lower than 310 DEG C and denitration commissioning is difficult, the steam extraction operation is switched into the newly-arranged steam extraction operation, the water feed temperature at an outlet of a first high-pressure heater can be increased through the new steam extraction module, the circulation heat efficiency can be improved, further the coal consumption can be reduced, the denitration inlet smoke temperature at the low loads is increased, a denitration system can be operated at high efficiency at full-load sections, the environmental requirement is met, the denitration cost is lowered, and the economic benefit and the environmental protection benefit are remarkable.

The invention discloses a respective-control phase change comprehensive waste heat utilization air preheating system and method. The system comprises an air preheater (33), an air preheater front air way (31), an air preheater rear flue (32), a condensate water main pipe (11), a steam main pipe (15), an air heater (28), a flue gas phase change cooler (12), a flue gas water cooler (7), a phase change water heater (17), a condensate water regulating valve (30), a steam flow regulating valve (14) and a liquid flow pipe (5). By means of the respective-control phase change comprehensive waste heat utilization air preheating system and method, a respective-control phase change heat exchange manner is adopted in a final-stage flue gas waste heat recovery heat exchanger, the final-stage flue gas waste heat recovery heat exchanger is combined with a condensate water air heater and a high-temperature flue gas cooler, and waste heat recovery benefits are improved.

The invention discloses a flexibility-oriented deep peak regulation transformation scheme for a straight condensing unit. The flexibility-oriented deep peak regulation transformation scheme for the straight condensing unit comprises the steps of S1, designing a transformation scheme from four aspects of a stable combustion technology, coal pulverizing system optimization, a wide-load denitration technology and a control optimization technology by analyzing characteristics and a transformation target of the straight condensing unit; S2, applying an oxygen-enriched clean stable combustion technology to realize low-load operation stable combustion and low NOx emission; S3, applying an improved dynamic separator to a coal pulverizing system to improve the combustion quality; S4, putting a zero high-pressure heater into the low-load operation state to increase the smoke temperature of an inlet of a denitration system and then to realize low-load denitration; and S5, dynamically adjusting the change rate of a sliding pressure given value through an intelligent sliding pressure control technology to optimize control. According to the flexibility-oriented deep peak regulation transformation scheme for the straight condensing unit, a good reference is provided for flexible transformation.