CN104089294A - Flue gas waste heat recycling method - Google Patents
Flue gas waste heat recycling method Download PDFInfo
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- CN104089294A CN104089294A CN201410370414.3A CN201410370414A CN104089294A CN 104089294 A CN104089294 A CN 104089294A CN 201410370414 A CN201410370414 A CN 201410370414A CN 104089294 A CN104089294 A CN 104089294A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of the energy recycling process, and relates to a flue gas waste heat recycling method. Flue gas sequentially passes through a heat pipe evaporator of a first coal economizer heat pipe loop, a heat pipe evaporator of a second coal economizer heat pipe loop,..., and a heat pipe evaporator of an nth coal economizer heat pipe loop, and then passes through a heat pipe evaporator of a first air preheater heat pipe loop, a heat pipe evaporator of a second air preheater heat pipe loop,..., and a heat pipe evaporator of an mth air preheater heat pipe loop, wherein n is larger than or equal to 1 and less than or equal to 10, and m is larger than or equal to 1 and less than or equal to 10; after heat pipe working media in n+m heat pipe evaporators absorb flue gas waste heat, a gas-liquid phase change process generates, the temperature of flue gas is lowered, and efficient recycling of flue gas waste heat is achieved; the technological process is simple, the principle is scientific and reliable, operation is convenient to carry out, the service life of the devices is long, waste heat recovery efficiency is high, environment friendliness is achieved, and the method can be widely used for waste heat recycling in industrial production.
Description
Technical field:
The invention belongs to energy recovery and utilize technology field, relate to a kind of flue gas heat recovery method, particularly relate to a kind of method that the fume afterheat of boiler (kiln or various industrial processes) generation is carried out to high efficiente callback utilization that power type heat pipe is applied to.
Background technology:
The efficient utilization of the energy and energy-conserving and environment-protective have become the key issue that determines that can human society long-term sustainable fast development, just day by day be subject to people's attention, and how to make good use of the fume afterheat of boiler (kiln or various industrial processes), the efficient utilization and the energy-conserving and environment-protective problem tool that solve the energy are of great significance.In general, the efficiency of energy utilization of China's boiler or kiln is low at present, and the economy of energy is of poor benefits, and the technology of energy utilization system and situation backward in management do not obtain right-about, poorer than external advanced country economies of scale.The specific energy consumption of a lot of products has a long way to go compared with developed countries, as the major industrial product specific energy consumption of the industries such as iron and steel, generating, building materials, chemical industry exceeds 20%-80%, has very large energy-saving potential.The industrial utilization rate of waste heat of main power consumption such as iron and steel, generating, building materials, chemical industry, light textile and machinery are only 4%-5%, and the thermal efficiency of Industrial Boiler and kiln is 70% left and right.Therefore, rely on scientific and technological advances, utilize modern technologies, transformation Industrial Boiler and kiln, improve the thermal efficiency, first should reduce waste heat emptying, improves heat insulation, adiabatic, heat-insulating property simultaneously.
At present, the flue gas waste heat recovery that boiler (kiln or various industrial processes) produces is mainly that sensible heat by utilizing water carrys out the economizer of recovery waste heat and by utilizing the sensible heat of air to carry out the air preheater of recovery waste heat, wherein utilize the sensible heat of water to carry out the economizer discharge of Mist heat recovering large, water pump wasted work is many, the coefficient of heat transfer is low, less economical; And, as long as there is a pipe burst, will affect the normal operation of boiler (kiln or various industrial processes), there is potential safety hazard; In addition,, in the time that inlet water temperature is lower, often occur that part economizer pipeline causes pipeline acid corrosion phenomenon lower than acid dew-point temperature; The major defect that utilizes air sensible heat to carry out the air preheater of recovery waste heat is: no matter be recuperative airheater, or rotary regenerative air preheater, together with air duct must be close to exhaust gases passes, engineering arranges that difficulty is large, also has the phenomenons such as air and flue gas mix mutually; And because gas-gas heat exchange coefficient is low, heat exchanger is huge, make flue also very huge; In addition,, in the time that inlet air temperature is lower, often there is the heat exchanger corrosion phenomenon that air preheater causes lower than acid dew-point temperature.For the problems referred to above that solve the economizer of the sensible heat recovery waste heat that utilizes water and utilize the air preheater of the sensible heat recovery waste heat of air to exist, heat pipe economizer and heat-pipe air preheater are there is, what existing heat pipe economizer and heat-pipe air preheater were applied is all gravity type heat pipe, by tens, hundreds of and even several thousand heat pipes form heat pipe economizer or heat-pipe air preheater, this heat pipe economizer or heat-pipe air preheater utilize the economizer of the sensible heat recovery waste heat of water to improve part heat exchange efficiency with the air preheater of the sensible heat recovery waste heat that utilizes air, reduce heat exchange area, but still there are many deficiencies, water route and flue, together with heated air still must be close to flue, engineering arranges that difficulty is large, tens, hundreds of and even several thousand heat pipe close arrangement, are not easy to maintenance, are also difficult to find which root heat pipe lost efficacy, tens, the work operating mode of hundreds of and even several thousand heat pipes is different, and overall heat exchange amount is uncontrollable, and exhaust gas temperature is also uncontrollable, is difficult to equally avoid occurring acid dew point and the corrosion phenomenon that causes pipeline or heat exchanger.
Summary of the invention:
The object of the invention is to overcome the shortcoming that prior art exists, seek design a kind of flue gas heat recovery method is provided, realize the high efficiente callback utilization of fume afterheat, the problem existing while solving flue gas heat recovery in prior art.
To achieve these goals, the present invention realizes in flue gas waste heat recovery apparatus, its concrete process of recycling is: flue gas successively the heat pipe evaporator by the heat pipe evaporator of the 1st economizer heat pipe circulation, the 2nd economizer heat pipe circulation ..., the heat pipe evaporator that circulates of a n economizer heat pipe, and then heat pipe evaporator by the heat pipe evaporator of the 1st air preheater heat pipe circulation, the 2nd air preheater heat pipe circulation ..., the heat pipe evaporator that circulates of a m air preheater heat pipe, wherein 1≤n≤10,1≤m≤10, in n+m heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduces flue-gas temperature, realizes the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump is by woven hose extracting liquid working medium from multi-functional liquid container, liquid working substance after adherence pressure is assigned in heat pipe evaporator equably by the female pipe of feed flow and equal liquid pipe, liquid working substance in heat pipe evaporator absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe of biphase gas and liquid flow through gas and liquid collecting pipe, this gas-liquid two-phase gas-liquid distributing pipe of flowing through is evenly distributed in heat pipe condenser, biphase gas and liquid flow working medium transfers heat to after heated water or air in heat pipe condenser, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container by condenser to Multifunction tank connecting leg, liquid working substance in multi-functional liquid container enters solution pump through woven hose again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
The agent structure of flue gas heat recovery device of the present invention comprises smoke inlet, flue, economizer circulates with heat pipe, gas and liquid collecting pipe, heat pipe evaporator, all liquid pipes, knockout, air preheater circulates with heat pipe, exhanst gas outlet, temperature sensor after economizer, temperature sensor after air preheater, the female pipe of biphase gas and liquid flow, heat pipe condenser, the female pipe of feed flow, central controller, air preheat air channel, air outlet slit, air intake, gas-liquid distributing pipe, the outlet of economizer heating water, economizer heating water entrance, air bleeding valve, multi-functional liquid container, blowoff valve, woven hose, solution pump and tube connector, be divided into adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem by function, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and center-control subsystem, the two ends of flue are respectively smoke inlet and exhanst gas outlet, the individual economizer of n (1≤n≤10) forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem with heat pipe circulation according to counterflow configuration arranged in form, the individual air preheater of m (1≤m≤10) forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem with heat pipe circulation according to counterflow configuration arranged in form, each economizer is equipped with heat pipe circulation and air preheater heat pipe circulation upper end the heat pipe evaporator being arranged in flue, the both sides of each heat pipe evaporator are provided with gas and liquid collecting pipe and equal liquid pipe respectively, gas and liquid collecting pipe lower end is connected with distribution of air flow pipe by the female pipe of biphase gas and liquid flow, one side of distribution of air flow pipe is connected with the heat pipe condenser corresponding with heat pipe evaporator, the lower end of heat pipe condenser is opened respectively and is shaped with economizer heating water entrance and the outlet of economizer heating water, and adjacent two economizers are with being communicated with by the economizer heating water outlet of first heat pipe condenser and the economizer heating water entrance of second heat pipe condenser between heat pipe circulation, all the lower end of liquid pipe is provided with knockout, and knockout is communicated with solution pump by the female pipe of feed flow, heat pipe condenser is communicated with multi-functional liquid container by tube connector, the upper end of heat pipe condenser and multi-functional liquid container is equipped with air bleeding valve, and the lower end of multi-functional liquid container is provided with blowoff valve, between multi-functional liquid container and solution pump, be communicated with by woven hose, m air preheater is communicated with by air preheat air channel with the heat pipe condenser of the lower end of heat pipe circulation, the two ends in air preheat air channel are respectively air intake and air outlet slit, the rear of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem is respectively equipped with after economizer temperature sensor after temperature sensor and air preheater, the center-control subsystem flue-gas temperature that after temperature sensor and air preheater, temperature sensor records by central controller controls and after obtaining economizer.
Adverse current in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem of the present invention refers to that flue gas is to flow into from the heat pipe evaporator of the 1st economizer heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from n economizer, and heated water is to flow into from n economizer heating water entrance, n economizer heating water outlet flowed out, flow through successively n-1, n-2, finally flow into from the 1st economizer heating water entrance, the 1st economizer heating water outlet flowed out, this reverse flow, make to form between flue gas and water maximum heat transfer temperature difference, reduce heat exchange area, improve heat exchange efficiency, make thermodynamics irreversible loss reach minimum.
Adverse current in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem of the present invention refers to that flue gas is to flow into from the heat pipe evaporator of the 1st air preheater heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from m air preheater, and heated air flows into the heat pipe condenser of heat pipe circulation from m air preheater, flow through successively m-1, m-2, finally flow out with the heat pipe condenser of heat pipe circulation from the 1st air preheater, this reverse flow makes to form between flue gas and air maximum heat transfer temperature difference, reduce heat exchange area, improve heat exchange efficiency, make thermodynamics irreversible loss reach minimum.
Central controller in center-control subsystem of the present invention is by carrying out dibit control or frequency conversion continuous control to the solution pump in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, effectively control the duty of n biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, realize the reasonable control of flue-gas temperature after economizer, ensure that efficient energy reclaims; Central controller carries out dibit control or frequency conversion continuous control by the solution pump in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, effectively control the duty of m biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, realize the reasonable control of flue-gas temperature after air preheater, ensure that efficient energy reclaims, and effectively avoid the generation of acid corrosion phenomenon.
The present invention can be complex as a total system by adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and three subsystems of center-control; Also can separately adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and two subsystems of center-control be complex as to a total system; Can also separately adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and two subsystems of center-control be complex as to a total system, determine according to flue-gas temperature height and user's heat demand any system that adopts.
Heat-recovering hot pipe economizer subsystem in the present invention and the front and back position of heat-recovering hot pipe air preheater subsystem in flue, can be according to user's request and flexible design, in the time that user needs the hot-air of hot water, lower temperature of higher temperature, adopt n adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem front, m the posterior arrangement of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem; In the time that hot water, the hot air temperature of user's needs approach, adopt the arrangement of n adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and m adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem alternative arrangement; In the time that user needs the hot water of hot-air, lower temperature of higher temperature, adopt m adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem front, n the posterior arrangement of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem.
To power type heat pipe, circulation has multiple special efficacy to multi-functional liquid container of the present invention, first heavy effect is start-up course exhaust: multi-functional liquid container is cylindrical shape, the liquid working substance coming from condenser enters multi-functional liquid container along the tangential direction of multi-functional liquid container, realize gas-liquid separation by centrifugal action, in start-up course, intrasystem non-condensable gas just enters into multi-functional liquid container top, discharges smoothly by air bleeding valve; Second heavy effect is the regular exhaust of running, ensures the long-term efficient operation of heat pipe: the portion gas of generation is gathered in Multifunctional liquid storage tank top by multi-functional liquid container, ensures the long-term efficient operation of heat pipe circulation by regular exhaust; Triple function is blowdown: the various impurity in system all can be deposited on Multifunctional liquid storage pot bottom by cyclic process, by blowoff valve, various impurity is discharged in time to the operation steady in a long-term of guarantee system.
Each evaporimeter in the heat pipe circulation of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem of the present invention, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and the setting height(from bottom) of condenser are unrestricted, as long as multi-functional liquid container is separately lower than heat pipe hair device and heat pipe condenser, ensure that condensate liquid can be back to corresponding multi-functional liquid container smoothly, just can normally work; If occur, part heat pipe hair device or heat pipe condenser must be arranged on the situation of corresponding fluid reservoir bottom, install a small-sized fluid reservoir and a reflux solution pump additional in this heat pipe hair device or heat pipe condenser bottom, can carry out flexible design according to user's actual conditions.
The stringing mode of heat pipe evaporator of the present invention and heat pipe condenser is horizontal stringing or rectilinear stringing, specifically adopts which kind of mode to determine according to on-site actual situations.
The present invention and prior art, compare and have the following advantages: the one, hot pipe system utilizes latent heat to transport energy, its internal circulating load transports a little 2-3 order of magnitude compared with sensible heat, thoroughly solves because discharge is large, water pump wasted work is many, the low problem such as less economical causing of the coefficient of heat transfer; The 2nd, the evaporimeter of hot pipe system and condenser are separate layouts, heat-pipe working medium amount in hot pipe system is very little, even if there is pipeline breaking in the heat pipe evaporator in flue, can not affect the normal operation of boiler (kiln or various industrial processes), thoroughly avoid affecting because of pipe burst the potential safety hazard of the normal operation of boiler (kiln or various industrial processes) yet; The 3rd, hot pipe system can make in heat pipe cycle fluid temperature close to flue-gas temperature by the particular design of evaporimeter and condenser, pass through again center-control subsystem to the strict temperature control of outlet flue gas, effectively avoid pipeline to cause corrosive pipeline phenomenon lower than acid dew-point temperature; The 4th, heat pipe evaporator and heat pipe condenser can need arbitrarily to arrange according to scene, thoroughly solves in original air preheater together with air duct must be close to exhaust gases passes, and engineering is arranged the large problem of difficulty, also avoids the phenomenons such as air and flue gas mix mutually; The 5th, hot pipe system can make in heat pipe cycle fluid temperature close to flue-gas temperature by the particular design of evaporimeter and condenser, pass through again center-control subsystem to the strict temperature control of outlet flue gas, effectively avoid heat exchanger to cause heat exchanger corrosion phenomenon lower than acid dew-point temperature; The problems such as the 6th, heat pipe evaporator and heat pipe condenser can need arbitrarily to arrange according to scene, thoroughly solves in prior art together with water route still must be close to flue with flue, heated air, and engineering layout difficulty is large; The 7th, the total quantity of hot pipe system is 2-20, far fewer than the gravity type system of current application tens, hundreds of and even several thousand heat pipes, solution tens, hundreds of and even several thousand heat pipe close arrangement, be not easy to maintenance, is difficult to find the problems such as which root heat pipe had lost efficacy; The 8th, each hot pipe system can regulate its heat exchange amount by controlling solution pump, the work operating mode that thoroughly solves original tens, hundreds of and even several thousand heat pipes is different, overall heat exchange amount is uncontrollable, exhaust gas temperature is also uncontrollable, is difficult to avoid occurring acid dew point and causes the problems such as corrosive pipeline phenomenon; Its technical process is simple, and principle science is reliable, easy to operate, equipment therefor long service life, and waste heat recovery efficiency is high, and environmental friendliness can be widely used in the heat recovery in industrial production.
Brief description of the drawings:
Fig. 1 is the flowage structure principle schematic of the embodiment of the present invention 1.
Fig. 2 is the flowage structure principle schematic of the embodiment of the present invention 2.
Fig. 3 is the flowage structure principle schematic of the embodiment of the present invention 3.
Fig. 4 is the flowage structure principle schematic of the embodiment of the present invention 4.
Detailed description of the invention:
Also be described further by reference to the accompanying drawings below by embodiment.
Embodiment 1:
Described in the present embodiment, the agent structure of flue gas heat recovery device comprises smoke inlet 1, flue 2, the 1st heat pipe circulation 3 for economizer, gas and liquid collecting pipe 4, heat pipe evaporator 5, all liquid pipes 6, knockout 7, n heat pipe circulation 8 for economizer, the 1st heat pipe circulation 9 for air preheater, m heat pipe circulation 10 for air preheater, exhanst gas outlet 11, temperature sensor 12 after economizer, temperature sensor 13 after air preheater, the female pipe 14 of biphase gas and liquid flow, heat pipe condenser 15, the female pipe 16 of feed flow, central controller 17, air preheat air channel 18, air outlet slit 19, air intake 20, gas-liquid distributing pipe 21, the 1st economizer heating water outlet 22, the 1st economizer heating water entrance 23, n economizer heating water outlet 24, n economizer heating water entrance 25, air bleeding valve 26, multi-functional liquid container 27, blowoff valve 28, woven hose 29, solution pump 30 and tube connector 31, be divided into adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem by function, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and center-control subsystem, the two ends of flue 2 are respectively smoke inlet 1 and exhanst gas outlet 11, the individual economizer of n (1≤n≤10) forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem with heat pipe circulation according to counterflow configuration arranged in form, the individual air preheater of m (1≤m≤10) forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem with heat pipe circulation according to counterflow configuration arranged in form, each economizer is equipped with heat pipe circulation and air preheater heat pipe circulation upper end the heat pipe evaporator 5 being arranged in flue 2, the both sides of each heat pipe evaporator 5 are provided with gas and liquid collecting pipe 4 and equal liquid pipe 5 respectively, gas and liquid collecting pipe 4 lower ends are connected with distribution of air flow pipe 21 by the female pipe 14 of biphase gas and liquid flow, one side of distribution of air flow pipe 21 is connected with the heat pipe condenser corresponding with heat pipe evaporator 5 15, the lower end of heat pipe condenser 15 is opened respectively and is shaped with economizer heating water entrance and the outlet of economizer heating water, and adjacent two economizers are with being communicated with by the economizer heating water outlet of first heat pipe condenser and the economizer heating water entrance of second heat pipe condenser between heat pipe circulation, all the lower end of liquid pipe 6 is provided with knockout 7, and knockout 7 is communicated with solution pump 30 by the female pipe 16 of feed flow, heat pipe condenser 15 is communicated with multi-functional liquid container 27 by tube connector 31, the upper end of heat pipe condenser 15 and multi-functional liquid container 27 is equipped with air bleeding valve 26, and the lower end of multi-functional liquid container 27 is provided with blowoff valve 28, between multi-functional liquid container 27 and solution pump 30, be communicated with by woven hose 29, m air preheater is communicated with by air preheat air channel 18 with the heat pipe condenser of the lower end of heat pipe circulation, the two ends in air preheat air channel 18 are respectively air intake 20 and air outlet slit 19, the rear of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem is respectively equipped with after economizer temperature sensor 13 after temperature sensor 12 and air preheater, and center-control subsystem controls and obtain by central controller 17 flue-gas temperature that after temperature sensor 12 and air preheater, temperature sensor 13 records after economizer.
The process that the present embodiment is realized flue gas heat recovery is: flue gas is successively by the heat pipe evaporator of the 1st economizer heat pipe circulation 3, the heat pipe evaporator of the 2nd economizer heat pipe circulation, ..., the heat pipe evaporator of n economizer heat pipe circulation 8, and then by the heat pipe evaporator of the 1st air preheater heat pipe circulation 9, the heat pipe evaporator of the 2nd air preheater heat pipe circulation, ..., the heat pipe evaporator of m air preheater heat pipe circulation 10, in n+m heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduce flue-gas temperature, realize the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump 30 is by woven hose 29 extracting liquid working medium from multi-functional liquid container 27, liquid working substance after adherence pressure is assigned in heat pipe evaporator 5 equably by the female pipe 16 of feed flow and equal liquid pipe 6, liquid working substance in heat pipe evaporator 5 absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe 14 of biphase gas and liquid flow through gas and liquid collecting pipe 4, this gas-liquid two-phase gas-liquid distributing pipe 21 of flowing through is evenly distributed in heat pipe condenser 15, biphase gas and liquid flow working medium transfers heat to after heated water or air in heat pipe condenser 15, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container 27 by condenser to Multifunction tank connecting leg 31, liquid working substance in multi-functional liquid container 27 enters solution pump through woven hose 29 again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
Adverse current described in the present embodiment in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem refers to that flue gas is to flow into from the heat pipe evaporator of the 1st economizer heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from n economizer, and heated water is to flow into from n economizer heating water entrance 25, heating water outlet 24 is flowed out, flow through successively n-1, n-2, finally flow into from the 1st economizer heating water entrance 23, heating water outlet 22 is flowed out, this reverse flow, make to form between flue gas and water maximum heat transfer temperature difference, reduce heat exchange area, improve heat exchange efficiency, make thermodynamics irreversible loss reach minimum.
Adverse current described in the present embodiment in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem refers to that flue gas is to flow into from the heat pipe evaporator of the 1st air preheater heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from m air preheater, and heated air flows into the heat pipe condenser of heat pipe circulation from m air preheater, flow through successively m-1, m-2, finally flow out with the heat pipe condenser of heat pipe circulation from the 1st air preheater, this reverse flow makes to form between flue gas and air maximum heat transfer temperature difference, reduce heat exchange area, improve heat exchange efficiency, make thermodynamics irreversible loss reach minimum.
Central controller 17 described in the present embodiment in center-control subsystem is by carrying out dibit control or frequency conversion continuous control to the solution pump 30 in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, effectively control the duty of n biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, realize the reasonable control of flue-gas temperature after economizer, ensure that efficient energy reclaims; Central controller 17 is by carrying out dibit control or frequency conversion continuous control to the solution pump in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, effectively control the duty of m biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, realize the reasonable control of flue-gas temperature after air preheater, ensure the high efficiente callback of energy, and effectively avoid the generation of acid corrosion phenomenon.
It is as follows that the present embodiment is realized startup and the running of flue gas heat recovery: be first mounted to flue gas heat recovery system and device by the combination of structural principle shown in Fig. 1, first dirty cleaning is blown in each heat pipe circulation line inside, again physico-chemical process Passivation Treatment is carried out in each heat pipe circulation line inside, after being disposed, n economizer heat pipe circulation and m air preheater are all found time with heat pipe circulation, after vacuum is up to standard, add respectively appropriate heat-pipe working medium; Flue-gas temperature after flue-gas temperature after economizer in center-control subsystem and air preheater is set to concrete numerical value, in flue, send in flue gas, air preheater and send in air, economizer and form after water circulation, center-control subsystem is by according to the actual numerical value of the flue-gas temperature after flue-gas temperature and air preheater after economizer, compare with the concrete numerical value of setting, according to selected control method, start and control the solution pump 30 of n economizer heat pipe circulation and the circulation of m air preheater heat pipe; Again after 50-100 minute, flue-gas temperature after flue-gas temperature and air preheater in system after economizer will reach setting value, whole system is in stationary operational phase, so just, can be successive, energy-efficiently by flue gas heat recovery, for user provides high-temperature-hot-water and high-temperature hot air.
Embodiment 2:
The flue gas heat recovery device that the present embodiment adopts adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem described in embodiment 1 and center-control subsystem to form carries out waste heat recovery, flue gas successively the heat pipe evaporator by the heat pipe evaporator of the 1st economizer heat pipe circulation 3, the 2nd economizer heat pipe circulation ..., circulate 8 heat pipe evaporator of a n economizer heat pipe, in n heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduce flue-gas temperature, realize the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump 30 is by woven hose 29 extracting liquid working medium from multi-functional liquid container 27, liquid working substance after adherence pressure is assigned in heat pipe evaporator 5 equably by the female pipe 16 of feed flow and equal liquid pipe 6, liquid working substance in heat pipe evaporator 5 absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe 14 of biphase gas and liquid flow through gas and liquid collecting pipe 4, this gas-liquid two-phase gas-liquid distributing pipe 21 of flowing through is evenly distributed in heat pipe condenser 15, biphase gas and liquid flow working medium transfers heat to after heated water in heat pipe condenser 15, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container 27 by condenser to Multifunction tank connecting leg 31, liquid working substance in multi-functional liquid container 27 enters solution pump through woven hose 29 again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
Embodiment 3:
The flue gas heat recovery device that the present embodiment adopts adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem described in embodiment 1 and center-control subsystem to form carries out waste heat recovery, flue gas is successively by the heat pipe evaporator of the 1st air preheater heat pipe circulation 9, the heat pipe evaporator of the 2nd air preheater heat pipe circulation, ..., the heat pipe evaporator of m air preheater heat pipe circulation 10, in m heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduce flue-gas temperature, realize the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump 30 is by woven hose 29 extracting liquid working medium from multi-functional liquid container 27, liquid working substance after adherence pressure is assigned in heat pipe evaporator 5 equably by the female pipe 16 of feed flow and equal liquid pipe 6, liquid working substance in heat pipe evaporator 5 absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe 14 of biphase gas and liquid flow through gas and liquid collecting pipe 4, this gas-liquid two-phase gas-liquid distributing pipe 21 of flowing through is evenly distributed in heat pipe condenser 15, biphase gas and liquid flow working medium transfers heat to after heated air in heat pipe condenser 15, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container 27 by condenser to Multifunction tank connecting leg 31, liquid working substance in multi-functional liquid container 27 enters solution pump through woven hose 29 again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
Embodiment 4:
Described in the present embodiment employing embodiment 1, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem alternately arrange that the flue gas heat recovery device forming carries out waste heat recovery, flue gas is successively by the heat pipe evaporator of the 1st economizer heat pipe circulation 3, the heat pipe evaporator of the 1st air preheater heat pipe circulation 9, the heat pipe evaporator of the 2nd economizer heat pipe circulation, the heat pipe evaporator of the 2nd air preheater heat pipe circulation ..., the heat pipe evaporator of n economizer heat pipe circulation 8, the heat pipe evaporator (n=m) of m air preheater heat pipe circulation 10, in n+m heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduce flue-gas temperature, realize the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump 30 is by woven hose 29 extracting liquid working medium from multi-functional liquid container 27, liquid working substance after adherence pressure is assigned in heat pipe evaporator 5 equably by the female pipe 16 of feed flow and equal liquid pipe 6, liquid working substance in heat pipe evaporator 5 absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe 14 of biphase gas and liquid flow through gas and liquid collecting pipe 4, this gas-liquid two-phase gas-liquid distributing pipe 21 of flowing through is evenly distributed in heat pipe condenser 15, biphase gas and liquid flow working medium transfers heat to after heated water or air in heat pipe condenser 15, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container 27 by condenser to Multifunction tank connecting leg 31, liquid working substance in multi-functional liquid container 27 enters solution pump through woven hose 29 again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
Claims (9)
1. a flue gas heat recovery method, it is characterized in that realizing in flue gas waste heat recovery apparatus, its concrete process of recycling is: flue gas is successively by the heat pipe evaporator of the 1st economizer heat pipe circulation, the heat pipe evaporator of the 2nd economizer heat pipe circulation, ..., the heat pipe evaporator of n economizer heat pipe circulation, and then by the heat pipe evaporator of the 1st air preheater heat pipe circulation, the heat pipe evaporator of the 2nd air preheater heat pipe circulation, ..., the heat pipe evaporator of m air preheater heat pipe circulation, wherein 1≤n≤10, 1≤m≤10, in n+m heat pipe evaporator there is gas-liquid phase transition process after absorbing fume afterheat in heat-pipe working medium, reduces flue-gas temperature, realizes the high efficiente callback utilization of fume afterheat, the specific works process of each heat pipe is: solution pump is by woven hose extracting liquid working medium from multi-functional liquid container, liquid working substance after adherence pressure is assigned in heat pipe evaporator equably by the female pipe of feed flow and equal liquid pipe, liquid working substance in heat pipe evaporator absorbs fume afterheat, there is liquid-gas phase transition process, after being converted into biphase gas and liquid flow, flow into the female pipe of biphase gas and liquid flow through gas and liquid collecting pipe, this gas-liquid two-phase gas-liquid distributing pipe of flowing through is evenly distributed in heat pipe condenser, biphase gas and liquid flow working medium transfers heat to after heated water or air in heat pipe condenser, total condensation is liquid working substance, this liquid working substance is transported to multi-functional liquid container by condenser to Multifunction tank connecting leg, liquid working substance in multi-functional liquid container enters solution pump through woven hose again, so move in circles, continuously fume afterheat is passed to heated water or air, realize the high efficiente callback utilization of fume afterheat.
2. flue gas heat recovery method according to claim 1, the agent structure that it is characterized in that described flue gas waste heat recovery apparatus comprises smoke inlet, flue, economizer circulates with heat pipe, gas and liquid collecting pipe, heat pipe evaporator, all liquid pipes, knockout, air preheater circulates with heat pipe, exhanst gas outlet, temperature sensor after economizer, temperature sensor after air preheater, the female pipe of biphase gas and liquid flow, heat pipe condenser, the female pipe of feed flow, central controller, air preheat air channel, air outlet slit, air intake, gas-liquid distributing pipe, the outlet of economizer heating water, economizer heating water entrance, air bleeding valve, multi-functional liquid container, blowoff valve, woven hose, solution pump and tube connector, be divided into adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem by function, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and center-control subsystem, the two ends of flue are respectively smoke inlet and exhanst gas outlet, n economizer forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem with heat pipe circulation according to counterflow configuration arranged in form, m air preheater forms adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem with heat pipe circulation according to counterflow configuration arranged in form, wherein 1≤n≤10,1≤m≤10, each economizer is equipped with heat pipe circulation and air preheater heat pipe circulation upper end the heat pipe evaporator being arranged in flue, and the both sides of each heat pipe evaporator are provided with gas and liquid collecting pipe and equal liquid pipe respectively, gas and liquid collecting pipe lower end is connected with distribution of air flow pipe by the female pipe of biphase gas and liquid flow, one side of distribution of air flow pipe is connected with the heat pipe condenser corresponding with heat pipe evaporator, the lower end of heat pipe condenser is opened respectively and is shaped with economizer heating water entrance and the outlet of economizer heating water, and adjacent two economizers are with being communicated with by the economizer heating water outlet of first heat pipe condenser and the economizer heating water entrance of second heat pipe condenser between heat pipe circulation, all the lower end of liquid pipe is provided with knockout, and knockout is communicated with solution pump by the female pipe of feed flow, heat pipe condenser is communicated with multi-functional liquid container by tube connector, the upper end of heat pipe condenser and multi-functional liquid container is equipped with air bleeding valve, and the lower end of multi-functional liquid container is provided with blowoff valve, between multi-functional liquid container and solution pump, be communicated with by woven hose, m air preheater is communicated with by air preheat air channel with the heat pipe condenser of the lower end of heat pipe circulation, the two ends in air preheat air channel are respectively air intake and air outlet slit, the rear of adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem is respectively equipped with after economizer temperature sensor after temperature sensor and air preheater, the center-control subsystem flue-gas temperature that after temperature sensor and air preheater, temperature sensor records by central controller controls and after obtaining economizer.
3. flue gas heat recovery method according to claim 2, the stringing mode that it is characterized in that described heat pipe evaporator and heat pipe condenser is horizontal stringing or rectilinear stringing.
4. flue gas heat recovery method according to claim 2, it is characterized in that the adverse current in described adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem refers to that flue gas is to flow into from the heat pipe evaporator of the 1st economizer heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from n economizer, and heated water is to flow into from n economizer heating water entrance, n economizer heating water outlet flowed out, flow through successively n-1, n-2, finally flow into from the 1st economizer heating water entrance, the 1st economizer heating water outlet flowed out, wherein 1≤n≤10.
5. flue gas heat recovery method according to claim 2, it is characterized in that the adverse current in described adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem refers to that flue gas is to flow into from the heat pipe evaporator of the 1st air preheater heat pipe circulation, flow through successively the 2nd, the 3rd, to the last flow out with the heat pipe evaporator of heat pipe circulation from m air preheater, and heated air flows into the heat pipe condenser of heat pipe circulation from m air preheater, flow through successively m-1, m-2, finally flow out with the heat pipe condenser of heat pipe circulation from the 1st air preheater, wherein 1≤m≤10.
6. flue gas heat recovery method according to claim 2, it is characterized in that central controller in described center-control subsystem is by carrying out dibit control or frequency conversion continuous control to the solution pump in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, effectively control the duty of n biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, realize the reasonable control of flue-gas temperature after economizer, ensure that efficient energy reclaims; Central controller carries out dibit control or frequency conversion continuous control by the solution pump in adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, effectively control the duty of m biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem, realize the reasonable control of flue-gas temperature after air preheater, ensure that efficient energy reclaims, and effectively avoid the generation of acid corrosion phenomenon, wherein 1≤n≤10,1≤m≤10.
7. flue gas heat recovery method according to claim 2, is characterized in that flue gas waste heat recovery apparatus can be complex as a total system by adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and three subsystems of center-control; Also can separately adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem and two subsystems of center-control be complex as to a total system; Can also separately adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and two subsystems of center-control be complex as to a total system.
8. flue gas heat recovery method according to claim 2, it is characterized in that circulation has multiple special efficacy to described multi-functional liquid container to power type heat pipe, first heavy effect is start-up course exhaust: multi-functional liquid container is cylindrical shape, the liquid working substance coming from condenser enters multi-functional liquid container along the tangential direction of multi-functional liquid container, realize gas-liquid separation by centrifugal action, in start-up course, intrasystem non-condensable gas just enters into multi-functional liquid container top, discharges smoothly by air bleeding valve; Second heavy effect is the regular exhaust of running, ensures the long-term efficient operation of heat pipe: the portion gas of generation is gathered in Multifunctional liquid storage tank top by multi-functional liquid container, ensures the long-term efficient operation of heat pipe circulation by regular exhaust; Triple function is blowdown: the various impurity in system all can be deposited on Multifunctional liquid storage pot bottom by cyclic process, by blowoff valve, various impurity is discharged in time to the operation steady in a long-term of guarantee system.
9. flue gas heat recovery method according to claim 2, the setting height(from bottom) that it is characterized in that each evaporimeter in the heat pipe circulation of described adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery economizer subsystem, adverse current combined type biphase gas and liquid flow heat pipe waste heat recovery air preheater subsystem and condenser is unrestricted, as long as multi-functional liquid container is separately lower than heat pipe hair device and heat pipe condenser, ensure that condensate liquid can be back to corresponding multi-functional liquid container smoothly, just can normally work; If occur, part heat pipe hair device or heat pipe condenser must be arranged on the situation of corresponding fluid reservoir bottom, install a small-sized fluid reservoir and a reflux solution pump additional in this heat pipe hair device or heat pipe condenser bottom.
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| CN106855249A (en) * | 2017-03-10 | 2017-06-16 | 孙立宇 | A kind of residual neat recovering system for preventing dewpoint corrosion |
| CN110715449A (en) * | 2019-10-24 | 2020-01-21 | 中国特种设备检测研究院 | Cross arrangement method for flue gas latent heat recovery devices of gas-fired boiler |
| CN112747623A (en) * | 2020-10-28 | 2021-05-04 | 黄书安 | High-efficiency heat exchanger |
| WO2023221274A1 (en) * | 2022-05-18 | 2023-11-23 | 北京航化节能环保技术有限公司 | Zero-power-consumption adaptive distributed waste heat recycling system for ethylene plant |
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