CN102798312B - Device for recycling waste heat of boiler - Google Patents
Device for recycling waste heat of boiler Download PDFInfo
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- CN102798312B CN102798312B CN 201210348409 CN201210348409A CN102798312B CN 102798312 B CN102798312 B CN 102798312B CN 201210348409 CN201210348409 CN 201210348409 CN 201210348409 A CN201210348409 A CN 201210348409A CN 102798312 B CN102798312 B CN 102798312B
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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 manufacture field, particularly a kind of boiler afterheat recovering device.
Background technology
Exist high fume temperature in the industrial boiler operation process, insufficient, the problem such as boiler thermal output is low of burning.The energy total amount of exhaust gas heat loss's disalignment is huge, and this part of energy is taken full advantage of the empty G&W of waste heat, improves air themperature and feed temperature, can improve fuel utilization efficiency to a certain extent.Industrial boilers in China is used the cast iron gilled tube economizer Mist heat recovering over nearly 50 years always, and its heat transfer efficiency is low, the difficult cleaning of dust stratification, not corrosion-resistant.The device of several types, the contradiction between cold end corrosion, fouling, manufacture and operating cost have also been developed both at home and abroad for Industrial Boiler heat recovery problem.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 use, 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 practical significance.Verified that the boiler flue gas outlet temperature is up to 260 ℃-320 ℃; Cast iron gilled tube economizer practical application efficiency is less than 3%, and exhaust gas temperature is still over 200 ℃.
Need to adopt heat exchange element in boiler afterheat recovering device, conventional graphite can not be for heat exchange element, and temperature surpasses 110 ℃ and just ftractureed, so there is technology prejudice in those skilled in the art, is to think that Delanium can't be for heat exchange element.
Summary of the invention
The present invention proposes a kind of boiler afterheat recovering device, can the high efficiente callback boiler afterheat.The technical solution adopted in the present invention specifically is achieved in that
The invention provides a kind of boiler afterheat recovering device, it comprises heat exchange element, and described heat exchange element is Delanium.
Preferably, described boiler afterheat recovering device is between the entrance and exit of flue.
Preferably, the Delanium in described heat exchange element forms through graphite impregnation, curing processing and heat treatment.
Preferably, the thermal conductivity factor mean value of described 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, flue heat passes to and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat by described heat exchange element.
Preferably, described heat exchange element is graphite block heat exchanger, shell and tube, drum type brake or its combined type.
Preferably, described heat exchange element comprises the hot arc again that is close to flue entrance and the heat exchanging segment be connected with described hot arc again.
Preferably, described hot arc again is that cylindrical shape is jacket structured, and inside is the two-way fin cylinder of corrosion resistant graphite-made, and flue gas passes through internally, and outside is stainless steel shell.
Preferably, described heat exchanging segment is that cylindrical shape is jacket structured, and inside is combined as described Delanium heat exchange element by four graphite nahlocks, and barrel shrond is stainless steel, graphite nahlock assembly is the detachable structure of changing, and graphite nahlock vertical and horizontal have interlaced duct.
Preferably, described heat exchange element comprises upper perforated plate, lower perforated plate and therebetween some Delanium heat exchanger tubes, and magnetic flap level gauge and liquid level alarm interlock device are installed in described boiler afterheat recovering device top.
Boiler afterheat recovering device of the present invention, fully the recovery boiler fume afterheat, significantly improve boiler feed temperature and can reach 90 ℃-95 ℃; The exhaust temperature of flue gas can be dropped to below acid dew point, reduce the discharge of pernicious gas in boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device has realized improving the re-set target of boiler thermal output 8%-10%.
The accompanying drawing explanation
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 above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail, it will be more clear making above-mentioned and other purpose of the present invention, Characteristics and advantages.In whole accompanying drawings, identical Reference numeral is indicated identical part.Deliberately do not draw in proportion accompanying drawing, focus on illustrating purport of the present invention.
In the boiler afterheat recovering device technical field, the ubiquity Delanium can not be for the technology prejudice of heat exchange element, because traditional Delanium is in the hot environment of 110 ℃ of left and right and just there will be and become fragile or rupture, the present patent application people is in order further to grasp the graphite material combination property, processed a large amount of test test specimens, entrust domestic well-known scientific research institution respectively to the linear expansion coefficient of graphite material, thermal conductivity factor, heat endurance, fretting wear, structure and mechanical property have been carried out test analysis, comprehensive evaluation result is: 1. graphite is except the strong oxidizing property medium, other chemicals is all shown to chemical inertness, 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/ ℃), belong to the less material of thermal expansion, 4. the graphite thermal decomposition temperature is greater than 250 ℃, meets the requirement of energy-saving device of boiler heat exchange element, 5. below test temperature (200 ℃), the graphite coefficient of sliding friction, 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, and 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 is identical with thickness, the temperature difference between material high temperature side wall and low temperature side wall, increase and reduce with thermal conductivity factor.At boiler flue gas outlet, the application boiler afterheat recovering device is installed, is fully reclaimed the waste heat in high-temperature flue gas, for the feedwater of heating boiler, reduce to greatest extent smog discharge temperature, 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 carried out successively, particularly, wherein graphite impregnation technique comprises step: a. cleans graphite piece, the dry processing.Particularly, eliminate graphite piece surface dirt, grease, and carry out drying and process; B. be contained in the dipping still and vacuumize.Particularly, graphite piece is placed in hanging box, described hanging box is put into to the dipping still, lid is covered tightly, connect pipeline, start to vacuumize; The vacuum vacuumized 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 vacuum.Particularly, under the condition that continues to vacuumize, Open valve is by the described dipping still of resin suction; In the present embodiment, amount of resin is by graphite piece submergence 10cm-15cm.D. pass into compressed air, take out graphite piece and dry.Particularly, pass into compressed air, make all emptying pushing back in holding vessel of described resin, open described dipping kettle cover, take out graphite piece and dry; Wherein, particularly, curing process comprises step: e. pack into curing still, pressurized with compressed air.Particularly, the dipping graphite piece of get well and drying is packed in polymeric kettle, graphite piece is spaced apart, fixes capping, opens compressor and passes into compressed air, and maintenance is pressed in the promoting the circulation of qi of going forward side by side; In the specific embodiment of the invention, air pressure remains on 0.93MPa.F. the energising be heating and curing, cooling.Particularly, connect circuit, slowly heated in jacket of polymerization, heat to temperature required rear constant temperature maintenance, after constant temperature, stop heating, emptying release, make it naturally cooling; Slowly heat and per hour be no more than 20 ℃, 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 be controlled.Then, take out graphite piece, for several times dipping, curing.Particularly, graphite piece is repeated to three described graphite impregnations and described curing process process; Afterwards, the heat treatment box of packing into, energising intensification heat treatment, cooling, take out graphite piece.Particularly, graphite piece is fitly put into to heat treatment box graphite piece is heat-treated, the temperature inside the box to be heated is opened chamber door after naturally being down to environment temperature, takes out graphite piece; Heat treatment temperature in 250-300 ℃ of scope, temperature retention time 15 days.In Delanium heat exchange element production method of the present invention, the graphite tube extruding machine that graphite piece adopts hydraulic pressure to exert pressure, pressure is 420 * 10
3kg-450 * 10
3kg.In Delanium heat exchange element production method, per hour heat up 2 ℃-3 ℃ during heat treatment, rise to about 130 ℃ in temperature and keep constant temperature a few hours, rise to about 180 ℃ in temperature and keep constant temperature a few hours, rise to about 250 ℃ in temperature and keep constant temperature a few hours, rise to 300 ℃ of left and right constant temperature in temperature and keep 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 that makes to flood in the impermeable graphite material thoroughly solidifies, few part resin meeting carbonization during this time, 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.By facts have proved, the Delanium material of manufacturing of adopting new technology can meet 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 larger improvement in the technical process of dip parameters and cure parameter on conventional basis, comprises and extends the pumpdown time, gas clean-up; Improve impregnation pressure, extend dip time; Adopt the DCS control device, reduce solidify the amplitude that heats up and lower the temperature and improve stability and accuracy.
In addition, for the graphite-pipe common process, improve, the device for exerting of traditional graphite tube extruding machine is that the electrical motor driven screw rod carries out mechanical compression, 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 transformation, greatly improved the graphite-pipe extrusion pressure, make that the graphite-pipe material is finer and close, 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 hot and process still, adopt Electric heating, to graphite nahlock, graphite cylinder and graphite-pipe for boiler afterheat recovering device, at dipping with after solidifying, increase by 250 ℃ of-300 ℃ of Technologies for Heating Processing, temperature retention time reaches 15 days.The conventional curing processing time is generally 10 hours, and solidification temperature is generally 180 ℃-200 ℃.By heat treatment, make to flood phenolic resins in the impermeable graphite material and thoroughly solidify, during few part phenolic resins can carbonization, heat treatment need, under the prerequisite that guarantees mechanical strength, improve institutional framework and the stability in use of graphite material; Because the linear expansion coefficient of phenolic resins is greater than graphite, further reduced the thermal coefficient of expansion of dipping impermeable graphite material after heat treatment; Because the heat transfer coefficient of phenolic resins is less than graphite, further improved the combination property of research and development graphite materials after 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 manufacturing the heat exchange element in boiler afterheat recovering device.The present invention adopts Delanium as heat exchange element, has overcome conventional art prejudice, need to carry out specially treated technique to obtain technical support to Delanium, thereby makes the Delanium can be for the waste-heat recovery device of boiler.
The first embodiment
Fig. 1 is the air-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention, as shown in Figure 1, the boiler export flue flue gas that contains amount of heat out is after boiler afterheat recovering device, part heat wherein passes to boiler afterheat recovering device, thereby realize the recycling of boiler afterheat, in Fig. 1, by pressure fan, cold air is carried by after boiler afterheat recovering device, cold wind becomes hot blast, hot blast passes into the boiler inlet air channel afterwards, thereby realize the recycling of heat, save the energy.
Fig. 2 is the water-cooled FB(flow block) of the boiler afterheat recovering device of first embodiment of the invention, as shown in Figure 2, the boiler export flue flue gas that contains amount of heat out is after boiler afterheat recovering device, part heat wherein passes to boiler afterheat recovering device, thereby realize the recycling of boiler afterheat, in Fig. 2, after by water pump or circulating pump, cold water output being passed through to boiler afterheat recovering device, heat passes to cold water by the Delanium heat exchange element in this device, and then make cold water become steam or hot water, thereby realize the recycling of heat, save the energy.
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 the present embodiment is between the entrance 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 flue heat passes to and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat by the Delanium heat exchange element.
In the boiler afterheat recovering device of the present embodiment, Delanium heat exchange element 20 can be graphite block heat exchanger, shell and tube, drum type brake or its combined type; The Delanium heat exchange element comprises the hot arc again 100 of next-door neighbour flue entrance I and heat exchanging segment 200 with hot arc 100 is connected again; In the present embodiment, then hot arc 100 is that cylindrical shape is jacket structured, and inside is the two-way fin cylinder of corrosion resistant graphite-made, and flue gas passes through internally, and outside is stainless steel shell, preferably, adopts the tetrafluoro packing seal between institute's shell and 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 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, between the graphite nahlock, be sealed into Tetrafluoro spacer, between graphite nahlock and housing, be sealed into filler.
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 adopts is mainly by hot arc 100 and heat exchanging segment 200 form again.Hot arc 100 adopts cylindrical shape jacket structured again, and inside is the two-way fin cylinder of corrosion resistant graphite-made, and flue gas passes through internally; Outside is stainless steel shell, and the boiler soft water heated by heat exchanging segment flows between shell and finned tube, in the high-temperature flue gas district, reclaims more waste heat, continues to be heated to obtain the hot water of higher temperature, then flows to the hydrothermal area of boiler as boiler feedwater; Two-way fin has increased the heat transfer area of graphite cylinder greatly, adopts the tetrafluoro packing seal between shell and 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 large; Barrel shrond is stainless steel; Graphite nahlock assembly is detachable change structure, easy access and replacing; Graphite nahlock vertical and horizontal have interlaced duct, and between hole, wall thickness only has 6 millimeters, in transverse holes, by boiler soft water, flow through high-temperature flue gas in longitudinal hole, and the two carries out exchange heat.Be sealed into Tetrafluoro spacer between the graphite nahlock, between graphite nahlock and housing, be sealed into filler.
In the present embodiment, preferably, the distributor box top of boiler afterheat recovering device is furnished with the flushing inspection socket, can regularly open to enter that inside is checked and ash disposal, also can water pipe inserts and is directly rinsed, and has solved the difficult problem of fouling.The flue at boiler afterheat recovering device rear portion, be reduced to acid dew point in flue-gas temperature and can produce corrosion when following, and the flue inner surface need adopt high-temperature resistant coating (as organic silicon coating) to carry out anticorrosion with painting; Equipment after water-film Separator and the service condition of flue can not change because of the use of energy saver, therefore without any processing.
As shown in Figure 4, boiler 10 in boiler afterheat recovering device, for storing boiler feedwater, adopts cylindrical shape or rectangular configuration, and centre is divided into hydrothermal area and cold water area with the riser with perforate, volume is according to water temperature and heat exchange amount calculative determination, with liquid-level auto-control device; Water circulating pump can manually be controlled start and stop, also can interlock with air-introduced machine, automatically control when the boiler start/ stop stove, during boiler operatiopn, the micropower water circulating pump moves continuously, realized the uninterrupted recovery of residual heat from boiler fume, made soft water in boiler 10 remain higher temperature; Magnetic flap level gauge and liquid level alarm interlock device 50 are installed in boiler afterheat recovering device top, can report to the police and start circulating pump when liquid level is too low and carry out moisturizing, have guaranteed the safe handling of boiler afterheat recovering device.
As Fig. 4, in the flow chart of boiler afterheat recovering device of the present invention, by boiler smoke flow process and soft water flow process, formed.The high-temperature flue gas that boiler is discharged directly enters hot arc 100 again, flue gas is entered heat exchanging segment 200 after 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 fast reducing and boiler soft water temperature fast rise, the fully waste heat of recovered flue gas; Speed stabilizing is mobile downwards in heat exchanging segment is distributed to up to a hundred vertical cores for the flue gas of turbulent condition, and the granule dust in flue gas separates with under the inertial flow effect in deadweight from flue gas, deposits to except regularly carrying out the labor cleaning after ash bin; Flue-gas temperature drops to below acid dew point, part SO
2, NO
2condense into and vaporific or liquidly separate from flue gas Deng hazardous medium, precipitation or bring water-film Separator in heat exchanging segment and exhaust pass, reduced the content to hazardous medium in the boiler smoke of atmosphere by air-introduced machine and smoke stack emission, and originally with regard to regularly adding lime or alkali, carried out neutralisation treatment in the water-film Separator sedimentation basin, without increasing treatment measures.
For boiler soft water flow process, from the soft water of Na-ion exchanger, by the control of ball-cock assembly, boiler soft water in boiler 10 is remained in normal range (NR); 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 to seven times is folded to, be folded to circulation in the cross-drilled hole of each graphite nahlock assembly, larger flow process and abundant heat-exchange time, fully soft water temperature fast rise after Mist heat recovering; Enter hot arc by the soft water runner pipe again and continue to carry out heat exchange with the boiler export high-temperature flue gas, the soft water temperature flows to the boiler hydrothermal area after again improving, as the make-up water of boiler.
The present invention, 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 affect the characteristics such as safe operation of the boiler.
Boiler afterheat recovering device of the present invention, fully the recovery boiler fume afterheat, significantly improve boiler feed temperature and can reach 90 ℃-95 ℃; The exhaust temperature of flue gas can be dropped to below acid dew point, reduce the discharge of pernicious gas in boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device has realized improving the re-set target of boiler thermal output 8%-10%.
The 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.
In the present embodiment, with embodiment mono-something in common, repeat no more, 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 take the Delanium pipe as heat exchange element, adhering and sealing between Graphtic heat exchanging pipe and graphite tube plate; The direct access to plant gas approach of high temperature flue-gas from boiler, flow through in the Graphtic heat exchanging pipe interfascicular, from the device exhanst gas outlet, discharges; From the water inlet of device bottom, in low head, be published in Graphtic heat exchanging pipe; Upper water storage cylinder is the hot water from Graphtic heat exchanging pipe for storage, and flow out from delivery port; Upper perforated plate is water floating head hermetically-sealed construction, has improved the resistance to elevated temperatures of boiler afterheat recovering device.Upper water storage cylinder and low head are stainless steel, and crust of the device and smoke entrance distribute ring for box hat.Boiler afterheat recovering device is furnished with the inspection socket 4 of flushing, can regularly open and carry out internal check and ash disposal, also can the water pipe insertion directly be rinsed, and has solved the difficult problem of fouling.
Due to 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 (as 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 comprised of boiler smoke flow process and soft water flow process.The high-temperature flue gas that boiler is discharged directly enters the boiler afterheat recovering device shell side, in device, intrafascicular of graphite-pipe is equipped with the flue gas dividing plate, flue gas carries out countercurrent flow with the interior soft water of graphite tube bank after entering 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, then enter exhaust pass.High-temperature flue gas carries out sufficient heat exchange in boiler afterheat recovering device, flue-gas temperature fast reducing and boiler soft water temperature fast rise, and after high-temperature flue gas is recovered a large amount of waste heats, temperature drops to below 90 ℃; Flue-gas temperature drops to below acid dew point, part NO
x, SO
2vaporific or liquidly from flue gas, separate Deng condensing into, precipitate in boiler afterheat recovering device, reduced the content of hazardous medium in the boiler exhaust gas.
From the soft water of Na-ion exchanger, by the control of ball-cock assembly, boiler soft water in boiler is remained in normal range (NR); Boiler is used for storing boiler feedwater, cylindrical shape or rectangular configuration, and median septum band pod apertures, be divided into hydrothermal area and cold water area, and volume is according to water temperature and heat exchange amount calculative determination.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, restrain and enter upper water storage cylinder by graphite, after fully reclaiming the high-temperature flue gas waste heat, the soft water temperature is elevated to 90 ℃-95 ℃ fast, then flow to the boiler high-temperature region, as the make-up water of boiler.
The recirculated water the automatic control of pump.During boiler operatiopn, the micropower water circulating pump moves continuously, has realized the uninterrupted recovery of residual heat from boiler fume, makes soft water in boiler remain higher temperature; The liquid level alarm interlock device is installed on boiler afterheat recovering device top, and the too low alarm of liquid level also starts circulating pump and carries out moisturizing, has guaranteed the safe handling of boiler afterheat recovering device.
The abundant recovery boiler fume afterheat of the present invention, significantly improve boiler feed temperature and can reach 90 ℃-95 ℃; The exhaust temperature of flue gas can be dropped to below acid dew point, reduce the discharge of pernicious gas in boiler smoke, reach the dual purpose of energy-saving and emission-reduction.Site Test Analysis, boiler afterheat recovering device has realized improving the re-set target of boiler thermal output 8%-10%.Improvement value 8.0% with the thermal efficiency is calculated, and ten thousand tons of fire coals of every consumption, can save 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 traditional Delanium and can not by graphite modified, improve graphite-made and do work for the technology prejudice of heat exchange element, and graphite, for boiler, has been obtained to good benefit.
A lot of details have been set forth so that fully understand the present invention in above description.But above description is only preferred embodiment of the present invention, the present invention can implement much to be different from alternate manner described here, so the present invention is not subject to the restriction of top disclosed concrete enforcement.Any skilled personnel are not breaking away from technical solution of the present invention scope situation simultaneously, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Every content that does not break away from technical solution of the present invention,, all still belong in the scope of technical solution of the present invention protection any simple modification made for any of the above embodiments, equivalent variations and modification according to technical spirit of the present invention.
Claims (9)
1. a boiler afterheat recovering device, is characterized in that, comprises heat exchange element, and described heat exchange element is Delanium, and the thermal conductivity factor mean value of described 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.
2. boiler afterheat recovering device as claimed in claim 1, is characterized in that, described 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 described heat exchange element forms through graphite impregnation, curing processing and heat treatment.
4. 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, flue heat passes to and is positioned at its inner recirculated water and carries out the recovery of boiler afterheat by described heat exchange element.
5. boiler afterheat recovering device as claimed in claim 1, is characterized in that, described heat exchange element is graphite block heat exchanger, shell and tube, drum type brake or its combined type.
6. boiler afterheat recovering device as claimed in claim 1, is characterized in that, described heat exchange element comprises the hot arc again that is close to flue entrance and the heat exchanging segment be connected with described hot arc again.
7. boiler afterheat recovering device as claimed in claim 6, is characterized in that, described hot arc again is that cylindrical shape is jacket structured, and inside is the two-way fin cylinder of corrosion resistant graphite-made, and flue gas passes through internally, and outside is stainless steel shell.
8. boiler afterheat recovering device as claimed in claim 6, it is characterized in that, described heat exchanging segment is that cylindrical shape is jacket structured, inside is combined as described heat exchange element by four graphite nahlocks, barrel shrond is stainless steel, graphite nahlock assembly is the detachable structure of changing, and graphite nahlock vertical and horizontal have interlaced duct.
9. boiler afterheat recovering device as claimed in claim 1, it is characterized in that, described heat exchange element comprises upper perforated plate, lower perforated plate and therebetween some Delanium heat exchanger tubes, and magnetic flap level gauge and liquid level alarm interlock device are installed in described boiler afterheat recovering device top.
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| 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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| CN2055584U (en) * | 1989-07-13 | 1990-04-04 | 浙江工学院 | Plate graphite heat exchanger |
| CN101935230B (en) * | 2010-08-27 | 2013-01-30 | 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
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| CN102798312A (en) | 2012-11-28 |
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