CN102798312A - Device for recycling waste heat of boiler - Google Patents
Device for recycling waste heat of boiler Download PDFInfo
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- CN102798312A CN102798312A CN2012103484093A CN201210348409A CN102798312A CN 102798312 A CN102798312 A CN 102798312A CN 2012103484093 A CN2012103484093 A CN 2012103484093A CN 201210348409 A CN201210348409 A CN 201210348409A CN 102798312 A CN102798312 A CN 102798312A
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Abstract
The invention provides a device for recycling waste heat of a boiler. The device comprises a heat exchange element which is made from synthetic graphite. By using the device for recycling the waste heat of the boiler, the waste heat of flue gas of the boiler is fully recycled, the feed-water temperature of the boiler is remarkably improved, the emission temperature of the flue gas can be reduced to be lower than an acid dew point, the emission of harmful gases in the flue gas of the boiler is reduced, and the dual purposes of energy conservation and emission reduction are achieved.
Description
Technical field
The present invention relates to heat transmission equipment and make field, particularly a kind of boiler afterheat recovering device.
Background technology
In the industrial boiler operation process, exist problems such as exhaust gas temperature height, burning is insufficient, boiler thermal output is low.The energy total amount of exhaust gas heat loss's disalignment is huge, and this a part of energy is made full use of the empty G&W of waste heat, improves air themperature and feed temperature, can improve the fuel utilization ratio to a certain extent.Industrial boilers in China uses cast iron gilled tube economizer to reclaim fume afterheat always over nearly 50 years, its heat transfer efficiency is low, the difficult cleaning of dust stratification, not corrosion-resistant.Also developed the device of several types both at home and abroad to Industrial Boiler heat recovery problem, the contradiction between cold end corrosion, fouling, manufacturing and the operating cost.Therefore research and development promote that operating cost is low, long service life, the scope of application be wide; Can apply to various model new equipments and at steam boiler, hot-water boiler and the boiler of organic heat carrier of the fire coal of usefulness, fuel oil, combustion natural gas, and the Industrial Boiler waste heat boiler waste-heat recovery device that can be applied to have the chemical plant installations that waste heat recovery is worth has important and practical meanings.Verified that the boiler flue gas outlet temperature is up to 260 ℃-320 ℃; Cast iron gilled tube economizer practical application efficient is less than 3%, and exhaust gas temperature is still above 200 ℃.
Need in the boiler afterheat recovering device to adopt heat exchange element, conventional graphite can not be used for heat exchange element, and temperature surpasses 110 ℃ and just ftractureed, and is to think that Delanium can't be used for heat exchange element so there is technological prejudice in those skilled in the art.
Summary of the invention
The present invention proposes a kind of boiler afterheat recovering device, can the high efficiente callback boiler afterheat.The technical scheme that the present invention adopted specifically is achieved in that
The present invention provides a kind of boiler afterheat recovering device, and it comprises heat exchange element, and said heat exchange element is a Delanium.
Preferably, said boiler afterheat recovering device is between the entrance and exit of flue.
Preferably, the Delanium in the said heat exchange element forms through graphite impregnation, cured and heat treatment.
Preferably, the thermal conductivity factor mean value of said Delanium is 120.3 W/m ℃, thermal coefficient of expansion 6 * 10
-6/ ℃-11 * 10
-6/ ℃, heat decomposition temperature is greater than 250 ℃, and the coefficient of sliding friction is lower than 0.2.
Preferably, also comprise boiler, cold water storage cistern, circulating pump, control instrument and the connecting line between them, the flue heat passes to through said heat exchange element and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat.
Preferably, said heat exchange element is graphite block heat exchanger, shell and tube, drum type brake or its combined type.
Preferably, said heat exchange element comprises hot arc again that is close to flue entrance and the heat exchanging segment that is connected with said hot arc again.
Preferably, said hot arc again is that cylindrical shape is jacket structured, and inside is the two-way fin cylinder of corrosion resistant graphite system, and flue gas passes through internally, and the outside is stainless steel shell.
Preferably; Said heat exchanging segment is that cylindrical shape is jacket structured, and inside is combined as said Delanium heat exchange element by four graphite nahlocks, and barrel shrond is a stainless steel; Graphite nahlock assembly is the detachable structure of changing, and graphite nahlock vertical and horizontal have interlaced duct.
Preferably, said heat exchange element comprises upper perforated plate, lower perforated plate and therebetween some Delanium heat exchanger tubes, and magnetic turnover panel liquid level gauge and liquid level warning interlock are installed in said boiler afterheat recovering device top.
Boiler afterheat recovering device of the present invention, fully the recovery boiler fume afterheat significantly improves boiler feed temperature and can reach 90 ℃-95 ℃; Can the exhaust temperature of flue gas be dropped to below the acid dew point, reduce discharge of harmful gases in the boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device have realized improving the re-set target of boiler thermal output 8%-10%.
Description of drawings
Fig. 1 is the air-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention.
Fig. 2 is the water-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention.
Fig. 3 is the structural scheme of mechanism of the boiler afterheat recovering device of first embodiment of the invention.
Fig. 4 is the boiler afterheat recovering device FB(flow block) of first embodiment of the invention.
Fig. 5 is the structural scheme of mechanism of the boiler afterheat recovering device of second embodiment of the invention.
Fig. 6 is the boiler afterheat recovering device FB(flow block) of second embodiment of the invention.
The specific embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, does detailed explanation below in conjunction with the accompanying drawing specific embodiments of the invention, it will be more clear making above-mentioned and other purpose, characteristic and advantage of the present invention.Reference numeral identical in whole accompanying drawings is indicated identical part.Painstakingly do not draw accompanying drawing in proportion, focus on illustrating purport of the present invention.
In the boiler afterheat recovering device technical field; The ubiquity Delanium can not be used for the technological prejudice of heat exchange element; Because becoming fragile or rupturing will appear in the hot environment that traditional Delanium is in about 110 ℃; Applicant of the present invention has processed a large amount of tests and has used test specimen in order further to grasp the graphite material combination property, entrusts domestic well-known scientific research institution respectively linear expansion coefficient, thermal conductivity factor, heat endurance, fretting wear, structure and the mechanical property of graphite material to be carried out test analysis; Comprehensive evaluation result is: 1. graphite all shows chemical inertness to other chemicals except the strong oxidizing property medium; 2. thermal conductivity factor mean value is 120.3 W/ (m ℃), is three times, stainless seven times of steel; 3. the graphite thermal coefficient of expansion 6 * 10
-6-11 * 10
-6(1/ ℃) belongs to the thermal expansion materials with smaller; 4. the graphite heat decomposition temperature satisfies the requirement of energy-saving device of boiler heat exchange element greater than 250 ℃; 5. below test temperature (200 ℃), the graphite coefficient of sliding friction is lower than 0.2, belongs to than the low-friction coefficient material; 6. graphite powder is the main raw material(s) of processing graphite heat exchanger tube, can know that from SEM figure the graphite powder size can reach tens microns.
Because the high material of thermal conductivity factor has good heat conductivility, when heat flow density was identical with thickness, the temperature difference between material high temperature side wall and low temperature side wall reduced with the thermal conductivity factor increase.At boiler flue gas outlet installation application boiler afterheat recovering device, fully reclaim the waste heat in the high-temperature flue gas, be used for the feedwater of heating boiler, reduce smog discharge temperature to greatest extent, reach the energy-saving and emission-reduction purpose.
The Delanium heat exchange element that the present invention adopts, it comprises graphite impregnation and the curing process that carries out successively, particularly, wherein graphite impregnation technology comprises step: a. cleans graphite piece, dried.Particularly, eliminate graphite piece surface dirt, grease, and carry out dried; B. be contained in the dipping still and vacuumize.Particularly, graphite piece is placed on hangs in the frame, the said frame that hangs is put into the dipping still, will cover tightly, the connection pipeline begins to vacuumize; The vacuum that vacuumizes must not be lower than 0.095Mpa, and the time is no less than 6 hours, and impregnation pressure reaches 0.96MPa, dip time 6-8 hour.C. suction resin under the vacuum.Particularly, under the condition that continues to vacuumize, Open valve is with in the said dipping still of resin suction; In the present embodiment, amount of resin is with graphite piece submergence 10cm-15cm.D. feed compressed air, take out graphite piece and dry.Particularly, feed compressed air, the whole emptyings of said resin are pushed back in the holding vessel, open said dipping kettle cover, take out graphite piece and dry; Wherein, particularly, curing process comprises step: e. packs into and solidifies still, pressurized with compressed air.Particularly, graphite piece dipping is good and that dry is packed in the polymeric kettle, and graphite piece is spaced apart, fixes capping, and compressor and starting feeds compressed air, and the promoting the circulation of qi of going forward side by side is pressed and kept; In the specific embodiment of the invention, air pressure remains on 0.93MPa.F. energising is heating and curing, cools off.Particularly, connect circuit, in jacket of polymerization, slowly heat, heat to the constant temperature maintenance of temperature required back, after constant temperature finishes, stop heating, the emptying release is cooled off it naturally; Slowly heating per hour is no more than 20 ℃, and heating finishes to keep constant temperature more than 4 hours.Preferably, wherein heat up and lower the temperature and adopt scattered control system (DCS) to control.Then, take out graphite piece, for several times dipping, curing.Particularly, graphite piece is repeated three said graphite impregnations and said curing process process; Afterwards, the heat treatment box of packing into, graphite piece is taken out in energising intensification heat treatment, cooling.Particularly, graphite piece is fitly put into heat treatment box graphite piece is heat-treated, the temperature inside the box to be heated is opened chamber door after reducing to environment temperature naturally, takes out graphite piece; Heat treatment temperature in 250-300 ℃ of scope, temperature retention time 15 days.In the Delanium heat exchange element production method of the present invention, the graphite-pipe extruder that graphite piece adopts hydraulic pressure to exert pressure, pressure is 420 * 10
3Kg-450 * 10
3Kg.In the Delanium heat exchange element production method; Per hour heat up 2 ℃-3 ℃ during heat treatment; Rise to about 130 ℃ in temperature and to keep constant temperature number hour; Rise to about 180 ℃ in temperature and to keep constant temperature number hour, rise in temperature and keep constant temperature number hour about 250 ℃, rise to 300 ℃ of left and right sides constant temperature in temperature and kept 150-300 hour.
The Delanium heat exchange element that the present invention adopts; After process modification has particularly increased Technology for Heating Processing, the resin in the dipping impermeable graphite material is thoroughly solidified, during few part resin can carbonization; Under the prerequisite that guarantees mechanical strength; Improved the institutional framework stability of graphite material, thermal shock resistance increases substantially, and has guaranteed the serviceability of Delanium.Through facts have proved, the Delanium material of making of adopting new technology can satisfy the needs that boiler afterheat reclaims fully, and device operates steadily, safe and reliable, durable in use.Therefore adopt new technology and improved the combination property of Delanium heat exchange element.
The Delanium heat exchange element that the present invention adopts in order further to improve the mechanical strength of graphite material, has carried out bigger improvement on conventional basis in the technical process of dip parameters and cure parameter, comprise prolonging the pumpdown time, gas clean-up; Improve impregnation pressure, prolong dip time; Adopt the DCS control device, reduce to solidify the amplitude that heats up and lower the temperature and improve stability and accuracy.
In addition, improve for the graphite-pipe common process, the device for exerting of traditional graphite-pipe extruder carries out mechanical compression for the electrical motor driven screw rod, and general pressure is 170 * 10
3Kg-200 * 10
3Kg; In the Delanium heat exchange element production method of the specific embodiment of the invention device for exerting is transformed, carried out hydraulic pressure by oil hydraulic system and exert pressure, pressure brings up to 420 * 10
3Kg-450 * 10
3Kg.After transforming, improved the graphite-pipe extrusion pressure greatly, make that the graphite-pipe material is fine and close more, intensity significantly improves, heat transfer property is better, for heat-transfer effect, reliability and the durability of research and development device provides assurance.
In addition; In the Delanium heat exchange element production process that the present invention adopts, make special-purpose heat treatment still, adopt Electric heating; To boiler afterheat recovering device with graphite nahlock, graphite cylinder and graphite-pipe; At dipping with after solidifying, increase by 250 ℃ of-300 ℃ of Technologies for Heating Processing, temperature retention time reaches 15 days.The conventional cured time was generally 10 hours, and solidification temperature is generally 180 ℃-200 ℃.Through heat treatment, the phenolic resins in the dipping impermeable graphite material is thoroughly solidified, during few part phenolic resins can carbonization, heat treatment needs under the prerequisite that guarantees mechanical strength, to improve the institutional framework and the stability in use of graphite material; Because of the linear expansion coefficient of phenolic resins greater than graphite, further reduced dipping impermeable graphite material coefficient of thermal expansion coefficient after the heat treatment; Because of the heat transfer coefficient of phenolic resins less than graphite, further improved the combination property of research and development graphite materials after the heat treatment.
The Delanium heat exchange element that the present invention adopts; Can improve heatproof, the erosion resistant of graphite component; Improve thermal shock resistance, mechanical strength, service life and the thermal conductivity factor of graphite component; Reduce the coefficient of expansion of graphite component, its use occasion is improved greatly, be suitable for making the heat exchange element in the boiler afterheat recovering device.The present invention adopts Delanium as heat exchange element, has overcome conventional art prejudice, need carry out specially treated technology obtaining technical support to Delanium, thereby make Delanium can be used for the waste-heat recovery device of boiler.
First embodiment
Fig. 1 is the air-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention, and is as shown in Figure 1, and the flue gas that contains a large amount of heats that the boiler export flue comes out is through behind the boiler afterheat recovering device; Part heat transferred boiler afterheat recovering device wherein; Thereby realize the recycling of boiler afterheat, among Fig. 1, cold air is carried through behind the boiler afterheat recovering device by pressure fan; Cold wind becomes hot blast; Hot blast feeds the boiler inlet air channel afterwards, thereby realizes the recycling of heat, energy savings.
Fig. 2 is the water-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention, and is as shown in Figure 2, and the flue gas that contains a large amount of heats that the boiler export flue comes out is through behind the boiler afterheat recovering device; Part heat transferred boiler afterheat recovering device wherein; Thereby realize the recycling of boiler afterheat, among Fig. 2, cold water is exported through behind the boiler afterheat recovering device by water pump or circulating pump; Heat passes to cold water through the Delanium heat exchange element in this device; And then make cold water become steam or hot water, thereby realize the recycling of heat, energy savings.
Fig. 3 is the structural scheme of mechanism of the boiler afterheat recovering device of first embodiment of the invention, and Fig. 4 is the boiler afterheat recovering device FB(flow block) of first embodiment of the invention.
In conjunction with Fig. 3 and Fig. 4; The boiler afterheat recovering device of present embodiment is between the inlet I and outlet O of flue; Boiler afterheat recovering device comprises boiler 10, cold water storage cistern (not shown), Delanium heat exchange element 20, circulating pump 30, control instrument and the connecting line between them 40, and the flue heat passes to through the Delanium heat exchange element and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat.
In the boiler afterheat recovering device of present embodiment, Delanium heat exchange element 20 can be graphite block heat exchanger, shell and tube, drum type brake or its combined type; Hot arc again 100 that the Delanium heat exchange element comprises next-door neighbour flue entrance I and the heat exchanging segment 200 that is connected with hot arc 100 again; In the present embodiment, hot arc 100 is that cylindrical shape is jacket structured again, and inside is the two-way fin cylinder of corrosion resistant graphite system, and flue gas passes through internally, and the outside is stainless steel shell, preferably, adopts the tetrafluoro packing seal between institute's shell and the graphite fins cylinder; Preferably, heat exchanging segment 200 is that cylindrical shape is jacket structured, and inside is combined as the Delanium heat exchange element by four graphite nahlocks, and barrel shrond is a stainless steel, and graphite nahlock assembly is the detachable structure of changing, and graphite nahlock vertical and horizontal have interlaced duct.In the present embodiment, preferably, be sealed into Tetrafluoro spacer between the graphite nahlock, be sealed into filler between graphite nahlock and the housing.
As shown in Figure 3, in the present embodiment, the boiler afterheat recovering device of the Delanium heat exchange element that coal-burned industrial boiler adopted is mainly by hot arc 100 and heat exchanging segment 200 are formed again.Hot arc 100 adopts cylindrical shape jacket structured again, and inside is the two-way fin cylinder of corrosion resistant graphite system, and flue gas passes through internally; The outside is stainless steel shell, is flowed between shell and finned tube by the boiler soft water of heat exchanging segment heating, reclaims more waste heat in the high-temperature flue gas district, continues to be heated to obtain the hot water of higher temperature, and the hydrothermal area who flows to boiler then is as boiler feedwater; Two-way fin has increased the heat transfer area of graphite cylinder greatly, adopts the tetrafluoro packing seal between shell and the graphite fins cylinder.Heat exchanging segment 200 adopts cylindrical shape jacket structured, and inside is combined as heat exchange element by four graphite nahlocks, and not only compact conformation but also heat exchange area are very big; Barrel shrond is a stainless steel; Graphite nahlock assembly is detachable change structure, easy access and replacing; Graphite nahlock vertical and horizontal have interlaced duct, and wall thickness has only 6 millimeters between the hole, through boiler soft water, vertically flow through high-temperature flue gas in the hole in the transverse holes, and the two carries out exchange heat.Be sealed into Tetrafluoro spacer between the graphite nahlock, be sealed into filler between graphite nahlock and the housing.
In the present embodiment, preferably, the distributor box top of boiler afterheat recovering device is furnished with the flushing inspection socket, can regularly open entering inside and check and ash disposal, also can the water pipe insertion directly wash, and has solved the difficult problem of fouling.The flue at boiler afterheat recovering device rear portion is reduced to acid dew point in flue-gas temperature and can produces corrosion when following, and the flue inner surface need adopt high-temperature resistant coating (like organic silicon coating) to carry out anticorrosion with painting; The equipment after the water-film Separator and the service condition of flue can not change because of the use of energy saver, so need not any processing.
As shown in Figure 4; Boiler 10 in the boiler afterheat recovering device is used to store boiler feedwater, adopts cylindrical shape or rectangular configuration, and middle riser with the band perforate is divided into hydrothermal area and cold water area; Volume is confirmed according to water temperature and heat calculating, is had the automatic control of liquid device; Water circulating pump can manually be controlled start and stop; Also can interlock with air-introduced machine, when the boiler start/ stop stove, control automatically, the micropower water circulating pump moves continuously during the boiler operatiopn; Realized the uninterrupted recovery of residual heat from boiler fume, made that soft water remains higher temperature in the boiler 10; Magnetic turnover panel liquid level gauge and liquid level warning interlock 50 are installed in boiler afterheat recovering device top, and liquid level is crossed and can be reported to the police and start circulating pump when hanging down and carry out moisturizing, has guaranteed the safe handling of boiler afterheat recovering device.
Like Fig. 4, form by boiler smoke flow process and soft water flow process in the flow chart of boiler afterheat recovering device of the present invention.The high-temperature flue gas that boiler is discharged directly gets into hot arc 100 again; Flue gas is got into heat exchanging segment 200 behind the hot arc 100 boiler soft water absorption portion heats again; Carry out sufficient heat exchange at heat exchanging segment 200 and boiler soft water; Flue-gas temperature reduces and boiler soft water temperature fast rise fast, fully reclaims the waste heat of flue gas; The flue gas of turbulent condition in heat exchanging segment is distributed to up to a hundred vertical cores downwards speed stabilizing flow, the granule dust in the flue gas separates from flue gas under deadweight and inertial flow effect, deposits to except that regularly carrying out the labor cleaning behind the ash bin; Flue-gas temperature drops to below the acid dew point, part SO
2, NO
2Condense into Deng hazardous medium and vaporific or liquidly from flue gas, to separate; Deposition or bring water-film Separator in heat exchanging segment and exhaust pass; Reduced content through air-introduced machine and smoke stack emission hazardous medium in the boiler smoke of atmosphere; And carried out neutralisation treatment with regard to regularly adding lime or alkali originally in the water-film Separator sedimentation basin, need not to increase treatment measures.
For boiler soft water flow process,, make that boiler soft water remains in the normal range (NR) in the boiler 10 from the control of the soft water of Na-ion exchanger through ball-cock assembly; Micropower circulating pump 30 the using and the reserved; The soft water of boiler 10 cold water area is sent into from heat exchanging segment 200 bottoms of boiler afterheat recovering device; By built-in deflection plate soft water being carried out seven times is folded to; In the cross-drilled hole of each graphite nahlock assembly, be folded to circulation, bigger flow process and abundant heat-exchange time fully reclaim soft water temperature fast rise behind the fume afterheat; Get into again hot arc through the soft water runner pipe and continue to carry out heat exchange, flow to the boiler hydrothermal area after the soft water temperature improves once more, as the make-up water of boiler with the boiler export high-temperature flue gas.
The present invention is used for the high efficiente callback of fuel oil (gas) Industrial Boiler waste heat, has realized energy-conservation 8%-10%, and 350 ℃ of maximum operation (service) temperatures reclaim 90 ℃-95 ℃ of hot water temperatures.Have that corrosion resistance is strong, compact conformation, floor space are little, convenient operating maintenance, do not influence characteristics such as safe operation of the boiler.
Boiler afterheat recovering device of the present invention, fully the recovery boiler fume afterheat significantly improves boiler feed temperature and can reach 90 ℃-95 ℃; Can the exhaust temperature of flue gas be dropped to below the acid dew point, reduce discharge of harmful gases in the boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device have realized improving the re-set target of boiler thermal output 8%-10%.
Second embodiment
Fig. 5 is the structural scheme of mechanism of the boiler afterheat recovering device of second embodiment of the invention.Fig. 6 is the boiler afterheat recovering device FB(flow block) of second embodiment of the invention.
Repeat no more with embodiment one something in common in the present embodiment, in the present embodiment, the Delanium heat exchange element comprises upper perforated plate, lower perforated plate and therebetween some Delanium heat exchanger tubes.As shown in Figure 3, boiler afterheat recovering device is vertical tubulation structure, comprises water storage cylinder 1, low head 6, upper perforated plate 2, lower perforated plate 5, Delanium heat exchanger tube 3 etc.Device is inner to be heat exchange element with the Delanium pipe, adhering and sealing between graphite heat exchanger tube and the graphite tube plate; The direct access to plant gas approach of boiler high temperature flue gas flows through between the graphite heat-exchanging tube bundle, discharges from the device exhanst gas outlet; From the water inlet of device bottom, in low head, be published in the graphite heat exchanger tube; Last water storage cylinder is used to store the hot water from the graphite heat exchanger tube, and flows out from delivery port; Upper perforated plate is a water floating head hermetically-sealed construction, has improved the resistance to elevated temperatures of boiler afterheat recovering device.Last water storage cylinder and low head are stainless steel, and crust of the device and smoke entrance distribute ring to be box hat.Boiler afterheat recovering device is furnished with flushing inspection socket 4, can regularly open and carry out internal check and ash disposal, also can the water pipe insertion directly wash, and has solved the difficult problem of fouling.
Because the general inducing free fan of fuel oil (gas) Industrial Boiler, the structural design of boiler afterheat recovering device need consider to reduce the flue gas circulating resistance as far as possible; Boiler afterheat recovering device shell, exhanst gas outlet distribute the flue at ring and device rear portion, are reduced to acid dew point in flue-gas temperature and can produce corrosion when following, and inner surface need adopt high-temperature resistant coating (like organic silicon coating) to carry out anticorrosion with painting.
In the present embodiment, as shown in Figure 6, the boiler afterheat recovering device flow process mainly is made up of boiler smoke flow process and soft water flow process.The high-temperature flue gas that boiler is discharged directly gets into the boiler afterheat recovering device shell side; Intrafascicular of graphite-pipe is equipped with the flue gas dividing plate in the device; Flue gas carries out countercurrent flow with the interior soft water of graphite tube bank after getting into shell side from top to bottom; Soft water heat exchange in restraining with the graphite of flue gas median septum opposite side from bottom to top again gets into exhaust pass then.High-temperature flue gas carries out sufficient heat exchange in boiler afterheat recovering device, flue-gas temperature reduces and boiler soft water temperature fast rise fast, and temperature dropped to below 90 ℃ after high-temperature flue gas was recovered a large amount of waste heats; Flue-gas temperature drops to below the acid dew point, part NO
X, SO
2Vaporific or liquidly from flue gas, separate Deng condensing into, in boiler afterheat recovering device, precipitate, reduced the content of hazardous medium in the boiler exhaust gas.
From the control of the soft water of Na-ion exchanger, make that boiler soft water remains in the normal range (NR) in the boiler through ball-cock assembly; Boiler is used to store boiler feedwater, cylindrical shape or rectangular configuration, and median septum band pod apertures is divided into hydrothermal area and cold water area, and volume calculates definite according to water temperature and heat.Micropower water circulating pump the using and the reserved; The soft water of boiler cold water area is sent into from the boiler afterheat recovering device bottom; Get into upward water storage cylinder through the graphite tube bank; The soft water temperature is elevated to 90 ℃-95 ℃ fast after fully reclaiming the high-temperature flue gas waste heat, flows to the boiler high-temperature region then, as the make-up water of boiler.
Water circulating pump is controlled automatically.The micropower water circulating pump moves continuously during the boiler operatiopn, has realized the uninterrupted recovery of residual heat from boiler fume, makes that soft water remains higher temperature in the boiler; The liquid level warning interlock is installed on boiler afterheat recovering device top, and liquid level is crossed to report to the police when hanging down and start circulating pump and carried out moisturizing, has guaranteed the safe handling of boiler afterheat recovering device.
The abundant recovery boiler fume afterheat of the present invention significantly improves boiler feed temperature and can reach 90 ℃-95 ℃; Can the exhaust temperature of flue gas be dropped to below the acid dew point, reduce discharge of harmful gases in the boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device have realized improving the re-set target of boiler thermal output 8%-10%.Raising value 8.0% with the thermal efficiency is calculated, and ten thousand tons of fire coals of every consumption can be practiced thrift coal-fired 800 tons, and with 900 yuan of calculation of price per ton, the economic benefit expection reaches 720,000 yuan, and energy-saving effect is remarkable, and economic results in society are remarkable.
The present invention has overcome the technological prejudice that traditional Delanium can not be used for heat exchange element, through to graphite modified, improves graphite making work, and graphite is used for boiler, has obtained good benefit.
In above description, a lot of details have been set forth so that make much of the present invention.But above description only is preferred embodiment of the present invention, and the present invention can implement much to be different from alternate manner described here, so the present invention does not receive the restriction of top disclosed practical implementation.Any skilled personnel are not breaking away under the technical scheme scope situation of the present invention simultaneously; All the method for above-mentioned announcement capable of using and technology contents are made many possible changes and modification to technical scheme of the present invention, or are revised as the equivalent embodiment of equivalent variations.Every content that does not break away from technical scheme of the present invention, all still belongs in the scope of technical scheme protection of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (10)
1. a boiler afterheat recovering device is characterized in that, comprises heat exchange element, and said heat exchange element is a Delanium.
2. boiler afterheat recovering device as claimed in claim 1 is characterized in that said boiler afterheat recovering device is between the entrance and exit of flue.
3. boiler afterheat recovering device as claimed in claim 1 is characterized in that, the Delanium in the said heat exchange element forms through graphite impregnation, cured and heat treatment.
4. boiler afterheat recovering device as claimed in claim 3 is characterized in that, the thermal conductivity factor mean value of said Delanium is 120.3 W/m ℃, thermal coefficient of expansion 6 * 10
-6/ ℃-11 * 10
-6/ ℃, heat decomposition temperature is greater than 250 ℃, and the coefficient of sliding friction is lower than 0.2.
5. boiler afterheat recovering device as claimed in claim 1; It is characterized in that; Also comprise boiler, cold water storage cistern, circulating pump, control instrument and the connecting line between them, the flue heat passes to through said heat exchange element and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat.
6. boiler afterheat recovering device as claimed in claim 1 is characterized in that, said heat exchange element is graphite block heat exchanger, shell and tube, drum type brake or its combined type.
7. boiler afterheat recovering device as claimed in claim 1 is characterized in that, said heat exchange element comprises hot arc again that is close to flue entrance and the heat exchanging segment that is connected with said hot arc again.
8. boiler afterheat recovering device as claimed in claim 7 is characterized in that, said hot arc again is that cylindrical shape is jacket structured, and inside is the two-way fin cylinder of corrosion resistant graphite system, and flue gas passes through internally, and the outside is stainless steel shell.
9. boiler afterheat recovering device as claimed in claim 7; It is characterized in that; Said heat exchanging segment is that cylindrical shape is jacket structured, and inside is combined as said heat exchange element by four graphite nahlocks, and barrel shrond is a stainless steel; Graphite nahlock assembly is the detachable structure of changing, and graphite nahlock vertical and horizontal have interlaced duct.
10. boiler afterheat recovering device as claimed in claim 1; It is characterized in that; Said heat exchange element comprises upper perforated plate, lower perforated plate and therebetween some Delanium heat exchanger tubes, and magnetic turnover panel liquid level gauge and liquid level warning interlock are installed in said boiler afterheat recovering device top.
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| CN 201210348409 CN102798312B (en) | 2012-09-19 | 2012-09-19 | Device for recycling waste heat of boiler |
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| CN 201210348409 CN102798312B (en) | 2012-09-19 | 2012-09-19 | Device for recycling waste heat of boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344417A (en) * | 2014-10-30 | 2015-02-11 | 惠州市拓丰实业有限公司 | High-efficiency and energy-saving boiler |
| CN107042032A (en) * | 2017-03-06 | 2017-08-15 | 江苏省特种设备安全监督检验研究院南通分院 | Energy-saving graphite multitube smoke duster, its method of work and its repair method |
| CN116726616A (en) * | 2023-06-06 | 2023-09-12 | 山东禹城金晟生物净化有限公司 | High-temperature waste heat recycling device of gas boiler |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055584U (en) * | 1989-07-13 | 1990-04-04 | 浙江工学院 | Plate graphite heat exchanger |
| CN101935230A (en) * | 2010-08-27 | 2011-01-05 | 南通京通石墨设备有限公司 | Method for producing machining type impregnated graphite tube |
| CN202281211U (en) * | 2011-04-29 | 2012-06-20 | 江苏省特种设备安全监督检验研究院南通分院 | Fuel oil boiler high-efficiency waste heat recovery device |
-
2012
- 2012-09-19 CN CN 201210348409 patent/CN102798312B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2055584U (en) * | 1989-07-13 | 1990-04-04 | 浙江工学院 | Plate graphite heat exchanger |
| CN101935230A (en) * | 2010-08-27 | 2011-01-05 | 南通京通石墨设备有限公司 | Method for producing machining type impregnated graphite tube |
| CN202281211U (en) * | 2011-04-29 | 2012-06-20 | 江苏省特种设备安全监督检验研究院南通分院 | Fuel oil boiler high-efficiency waste heat recovery device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104344417A (en) * | 2014-10-30 | 2015-02-11 | 惠州市拓丰实业有限公司 | High-efficiency and energy-saving boiler |
| CN107042032A (en) * | 2017-03-06 | 2017-08-15 | 江苏省特种设备安全监督检验研究院南通分院 | Energy-saving graphite multitube smoke duster, its method of work and its repair method |
| CN116726616A (en) * | 2023-06-06 | 2023-09-12 | 山东禹城金晟生物净化有限公司 | High-temperature waste heat recycling device of gas boiler |
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|---|---|
| CN102798312B (en) | 2013-06-19 |
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