CN206222351U - A kind of low-temperature flue gas waste heat recovery system - Google Patents
A kind of low-temperature flue gas waste heat recovery system Download PDFInfo
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- CN206222351U CN206222351U CN201621236383.3U CN201621236383U CN206222351U CN 206222351 U CN206222351 U CN 206222351U CN 201621236383 U CN201621236383 U CN 201621236383U CN 206222351 U CN206222351 U CN 206222351U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The utility model discloses a kind of low-temperature flue gas waste heat recovery system, and the system is made up of graphite perfluoroethylene-propylene heat exchanger, Direct fired absorption heat pump, and the system can be with the latent heat of vaporization of vapor in the part sensible heat and flue gas of recovered flue gas.Graphite perfluoroethylene-propylene heat exchanger in system has merged that graphite heat conducting coefficient is high and the corrosion resistant feature of perfluoroethylene-propylene, when temperature is less than flue gas dew point temperature, being formed after Water vapor condensation will not must corrode with acid recirculated water to it, using low-temperature flue gas waste heat recovery system of the present utility model, the efficiency of using energy source can fully be improved with recovered flue gas sensible heat and the latent heat of vapor.
Description
Technical field
The utility model belongs to low-temperature flue gas waste heat recycling field, and in particular to one kind combines graphite perfluoroethylene-propylene
The middle low-temperature flue gas waste heat recovery system of heat exchanger and direct-fired absorption type heat pump assembly, low-temperature flue gas in being mainly used in reclaiming
The latent heat of vaporization of vapor in part sensible heat and flue gas.
Background technology
For a long time, always all based on extensive style, this causes very big the mode of production in terms of China's energy to the energy
Waste.In industrial processes, the exhaust gas temperature of boiler smoke is universal at 120 DEG C ~ 140 DEG C, and boiler efficiency 90% ~
94%.In various heat loss, heat loss due to exhaust gas accounts for more than half of boiler heat loss, and quantity is very considerable.If can be effective
Reduce below exhaust gas temperature to 57 DEG C of the flue gas dew point temperature of station boiler, boiler efficiency will improve 5 ~ 15 percentage points, the Spring Festival holidays
About about 20,000,000 tons of standard coal, year can emission reduction CO2About 30,000,000 tons ~ fifty-five million ton.
In industrial processes, exhaust gas temperature is typically all higher than 120 DEG C.According to the different temperatures water of waste heat carrier
Flat, waste heat can be divided into three kinds：High-temperature residual heat（More than 500 DEG C）, middle temperature waste heat（200℃~500℃）And low temperature exhaust heat（200℃
Below）.In smoke waste heat utilization system, heat exchanger is a series of a kind of visual plant for realizing heat conductive processes.In energy
Source is utilized with conversion process, and the metal heat exchanger with higher heat-conductivity is used mostly.For high temperature waste heat, due to
Its temperature is far above the dew-point temperature of flue gas, less problematic using metallic recuperator recovery waste heat.For middle-low temperature heat, work as cigarette
When temperature degree is less than 200 DEG C, S03Generation sulfuric acid vapor can be combined with vapor.Because the adiabatic condensation temperature of sulfuric acid is more much higher than water,
So even there was only few sulfuric acid vapor in flue gas, dew point can also rise at once.Due to containing NO in boiler tail flue gasx、
SO3、SO2Deng corrosive gas, when flue-gas temperature is less than " acid dew point ", contained oxysulfide is combined with vapor in flue gas
The acid vapors of formation will condense on metal wall, cause equipment generating surface that serious low-temperature corrosion occurs.
At present, also have no idea thoroughly solve the problems, such as low-temperature corrosion both at home and abroad, and plastics Polymer material is due to tool
There is good decay resistance and furtherd investigate and developed.The graphite perfluoroethylene-propylene applied in the utility model exchanges heat
Device, merged graphite heat conducting coefficient it is high the characteristics of and perfluoroethylene-propylene decay resistance, be the low temperature exhaust heat of recovered flue gas
There is provided effective way.
Utility model content
Easily there is the defect of low-temperature corrosion in recovered flue gas low temperature exhaust heat for conventional metals heat exchanger in the utility model,
There is provided a kind of low-temperature flue gas waste heat recovery system based on graphite perfluoroethylene-propylene heat exchanger with direct-fired source pump, should
System can have important with the latent heat of vaporization of vapor in the part sensible heat and flue gas of recovered flue gas for raising energy utilization rate
Meaning.The utility model mainly includes graphite perfluoroethylene-propylene heat exchanger and Direct fired absorption heat pump unit.Graphite is poly- complete
Fluoro ethyl propene heat exchanger exchanges heat, and heat exchange can be obtained the low-temperature water heating that temperature is about 25 DEG C.Direct fired absorption heat pump unit is then
65 DEG C of heating water return is obtained using 25 DEG C or so of low-temperature water heatings.
The utility model solves the technical scheme that its technical problem used：
A kind of low-temperature flue gas waste heat recovery system, including flue, flue are disposed with graphite along flow of flue gas direction
Perfluoroethylene-propylene heat exchanger, desulfuring and denitrifying apparatus, air-introduced machine, silencer and chimney；Described graphite perfluoroethylene-propylene is changed
Hot device is connected to form low-temperature water heating loop by pipeline with Direct fired absorption heat pump unit, and benefit is provided with low-temperature water heating loop
Water tank and water circulating pump.
The characteristics of graphite perfluoroethylene-propylene heat exchanger had not only had graphite heat conducting coefficient high is again with perfluoroethylene-propylene
Decay resistance；During low temperature exhaust heat is reclaimed, excellent heat transfer effect was both can guarantee that, acid vapors in flue gas can have been resisted again
Corrosion, adequately achieve the waste heat recovery of low-temperature flue gas；Water supply tank is that water at low temperature is supplied in low-temperature water heating loop, and low-temperature flue gas lead to
Cross flue to be exchanged heat into graphite perfluoroethylene-propylene heat exchanger and water at low temperature, after heat exchange, the flue gas that about 50 DEG C of temperature passes through
Desulphurization denitration equipment, air-introduced machine and silencer and chimney discharge flue on flue, the low-temperature water heating for being obtained about 25 DEG C enters straight
Combustion type absorption type heat pump assembly.
Described Direct fired absorption heat pump unit is provided with generator, condenser, absorber, evaporator and regenerator；
Described generator produces dense lithium-bromide solution, generator to be internally provided with heating pipeline, and generator passes through pipeline communication backheat
Device, regenerator is arranged on the lithium bromide spray equipment of absorber upper end by pipeline communication；Described condenser is connected by pipeline
The logical condensation water spray system for being arranged on part on evaporator；Described evaporator internal pipeline and low-temperature water heating circuit communication；
Described absorber is internally provided with interconnected pipeline with condenser and water inlet is passed through heating backwater, absorber bottom
Lithium bromide pump is provided with, lithium bromide pump enters generator after lithium bromide is pumped into regenerator heating through piping.
The part that graphite perfluoroethylene-propylene heat exchanger and Direct fired absorption heat pump unit mainly reclaim low-temperature flue gas shows
The latent heat of vaporization of vapor in heat and flue gas.
It is high vacuum environment in evaporator, the condensed water in condenser is sprayed by condensation water spray system in evaporator,
The heat of vaporization that condensed water absorbs 25 DEG C of low-temperature water heating in evaporator forms steam, and steam is diffused into absorber and condenser
In；Heating pipeline in generator inside carries out heating to dense lithium-bromide solution and prepares high temperature lithium bromide concentrated solution, high temperature bromination
Lithium concentrated solution reaches regenerator and is exchanged heat through piping, and the lithium bromide concentrated solution after heat exchange is sprayed by pipeline to lithium bromide
Shower device is sprayed to absorber inside；Lithium bromide concentrated solution absorbs the steam come in flash-pot during spray, from
And substantial amounts of heat is discharged for heating backwater；The thinning lithium-bromide solution in absorber bottom is due to absorbing partial heat
With certain temperature, dilute lithium-bromide solution is pumped in regenerator by lithium bromide and is exchanged heat with high temperature lithium bromide concentrated solution, carries
The temperature of dilute lithium-bromide solution high, afterwards dilute lithium-bromide solution be delivered to generator, generator is separated into refrigerant vapour and bromination
Lithium concentrated solution；The temperature of the dense lithium-bromide solution of part high temperature is absorbed in regenerator due to dilute lithium-bromide solution, so in hair
Without carrying out the heating of big intensity to lithium-bromide solution in raw device, reduce the power of the heating pipeline inside generator, save energy
Consumption；Steam forms condensed water into condensation after condenser, and the process institute liberated heat is re-used for heating backwater, thus
The heating that about 65 DEG C of prepared temperature is supplied water.
Preferably, described evaporator bottom is provided with back water pump, and the water pump of evaporator bottom is delivered to setting by back water pump
In the backwater spray equipment of evaporator upper end, condensed water then absorbs the heat of low-temperature water heating into evaporator and evaporates again, real
Existing repetitive cycling is used.
Preferably, the flue gas that described Direct fired absorption heat pump unit is produced imports the upstream portion of flue, direct combustion type
The flue gas that the generator of absorption heat pump is produced then is exchanged heat by flue into graphite perfluoroethylene-propylene heat exchanger, is realized
The abundant recovery and utilization of fume afterheat.
The utility model has the advantages that：
（1）When temperature is less than flue gas " acid dew point " temperature, contained oxysulfide is combined to form with vapor in flue gas
Acid vapors serious low-temperature corrosion, also, the graphite perfluoroethylene-propylene heat-exchange performance will not be caused to equipment generating surface
Can be good, it is possible to achieve the abundant recovery of low-temperature flue gas waste heat；
（2）The Direct fired absorption heat pump of the utility model application can exchange heat using in graphite perfluoroethylene-propylene heat exchanger
The heating that the heat of about 25 DEG C of low-temperature water heatings of gained produces 65 DEG C or so is supplied water, and wherein the generator of direct combustion type heat pump is produced
Flue gas is exchanged heat by flue into graphite perfluoroethylene-propylene heat exchanger, realizes abundant recovery and the profit of fume afterheat
With；
（3）The sensible heat of the recyclable flue gas of the utility model and the latent heat of vaporization of vapor, the cigarette by temperature at 120 DEG C or so
Gas is down to 50 DEG C or so, and boiler thermal output is higher by about 17% up to 107% or so than the thermal efficiency of conventional boiler, and this is to the energy
Make full use of it is significant.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
Fig. 2 is Direct fired absorption heat pump set structure sketch of the present utility model.
Specific embodiment
The utility model is further described below in conjunction with accompanying drawing：
As shown in figure 1, a kind of low-temperature flue gas waste heat recovery system, including flue 11, the downstream part of flue 11 is along flue gas stream
Graphite perfluoroethylene-propylene heat exchanger 12, desulfuring and denitrifying apparatus 13, air-introduced machine 14, the and of silencer 15 are disposed with dynamic direction
Chimney 16；Described graphite perfluoroethylene-propylene heat exchanger 12 is connected formation by pipeline with Direct fired absorption heat pump unit 17
Low-temperature water heating loop, is provided with water supply tank 18 and water circulating pump 19 on low-temperature water heating loop.Low-temperature flue gas are entered by flue 11
Graphite perfluoroethylene-propylene heat exchanger 12 is exchanged heat with water at low temperature, and after heat exchange, the flue gas by temperature at 120 DEG C or so is down to 50
DEG C or so, the flue gas that about 50 DEG C of temperature is by the desulphurization denitration equipment 13 on flue 11, air-introduced machine 14 and silencer 15 and chimney
16 discharge flues 11, water at low temperature heat absorption is obtained about 25 DEG C of low-temperature water heating and enters in Direct fired absorption heat pump unit 17.
As shown in Fig. 2 described Direct fired absorption heat pump unit be provided with generator 21, condenser 22, absorber 23,
Evaporator 24 and regenerator 25；Described generator 21 produces dense lithium-bromide solution, generator 21 to be internally provided with heating pipeline
26, generator 21 is arranged on the bromination of the upper end of absorber 23 by pipeline communication by pipeline communication regenerator 25, regenerator 25
Lithium spray equipment 27；Described condenser 22 is arranged on the condensation water spray system of part on evaporator 24 by pipeline communication
28；The described internal pipeline of evaporator 24 and low-temperature water heating circuit communication；Described absorber 23 is set with the inside of condenser 22
There is interconnected pipeline and water inlet is passed through heating backwater, the bottom of absorber 23 is provided with lithium bromide pump 29, lithium bromide pump
29 are pumped to after regenerator 25 is heated through piping into generator 21 lithium bromide.
Direct fired absorption heat pump unit specific work process：It is high vacuum environment in evaporator 24, water as refrigerant enters steaming
Hair device 24 absorbs water at low temperature heat of vaporization, forms steam；After steam enters absorber 23, by the dense lithium bromide from generator 21
Solution is absorbed, release heat be used for heating backwater；Thinning lithium-bromide solution is pumped to generation by lithium bromide pump 29
Device 21 and be heated pipeline 26 heat, be separated into refrigerant vapour and lithium bromide concentrated solution；Steam condenses shape after entering condenser 22
Into water as refrigerant, the process release heat is re-used for heating backwater, thus be obtained about 65 DEG C of temperature heating supply water；
Regenerator 25 realizes the dense lithium-bromide solution of high temperature and the heat exchange of dilute lithium-bromide solution, the heating pipeline 26 inside reduction generator 21
Power, saving energy consumption.
As shown in Fig. 2 absorbing Low Temperature Thermal again to realize that the condensed water of the bottom of evaporator 24 is entered into evaporator 24
The heat of water and evaporate, realize that repetitive cycling is used, the described bottom of evaporator 24 is provided with back water pump 30, and back water pump 30 will steam
The water pump of hair device 24 bottom delivers to the backwater spray equipment 31 for being arranged at the upper end of evaporator 24.
As shown in figure 1, in order to realize that the fume afterheat that Direct fired absorption heat pump unit 17 is produced sufficiently is reclaimed and profit
With the flue gas that described Direct fired absorption heat pump unit 17 is produced imports the upstream portion of flue 11.
Finally it should be noted that：Obviously, above-described embodiment is only intended to clearly illustrate the utility model example,
And not to the restriction of implementation method.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no need and unable to be exhaustive to all of implementation method.And thus
Among the obvious change or variation amplified out are still in protection domain of the present utility model.
Claims (3)
1. a kind of low-temperature flue gas waste heat recovery system, including flue, it is characterised in that flue downstream part is along flow of flue gas direction
On be disposed with graphite perfluoroethylene-propylene heat exchanger, desulfuring and denitrifying apparatus, air-introduced machine, silencer and chimney；
Described graphite perfluoroethylene-propylene heat exchanger is connected to form Low Temperature Thermal by pipeline with Direct fired absorption heat pump unit
Water loop, is provided with water supply tank and water circulating pump on low-temperature water heating loop；
Described Direct fired absorption heat pump unit is provided with generator, condenser, absorber, evaporator and regenerator；It is described
Generator produce dense lithium-bromide solution, generator to be internally provided with heating pipeline, generator is returned by pipeline communication regenerator
Hot device is arranged on the lithium bromide spray equipment of absorber upper end by pipeline communication；Described condenser is set by pipeline communication
The condensation water spray system of part on an evaporator；Described evaporator internal pipeline and low-temperature water heating circuit communication；Described
Absorber is internally provided with interconnected pipeline with condenser and water inlet is passed through heating backwater, and absorber bottom is provided with
Lithium bromide pump, lithium bromide pump enters generator after lithium bromide is pumped into regenerator heating through piping.
2. a kind of low-temperature flue gas waste heat recovery system as claimed in claim 1, it is characterised in that described evaporator bottom sets
Back water pump is equipped with, back water pump is delivered to the backwater spray equipment for being arranged at evaporator upper end by the water pump of evaporator bottom.
3. a kind of low-temperature flue gas waste heat recovery system as claimed in claim 1, it is characterised in that described direct-fired absorption
The flue gas that source pump is produced imports the upstream portion of flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621236383.3U CN206222351U (en) | 2016-11-18 | 2016-11-18 | A kind of low-temperature flue gas waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621236383.3U CN206222351U (en) | 2016-11-18 | 2016-11-18 | A kind of low-temperature flue gas waste heat recovery system |
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| CN206222351U true CN206222351U (en) | 2017-06-06 |
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| CN201621236383.3U Active CN206222351U (en) | 2016-11-18 | 2016-11-18 | A kind of low-temperature flue gas waste heat recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107448965A (en) * | 2017-07-14 | 2017-12-08 | 兰州理工大学 | A kind of Novel incineration furnace fume afterheat depth recovery and energy level lifting process system |
| CN108644796A (en) * | 2018-07-11 | 2018-10-12 | 上海环境工程设计研究院有限公司 | Catalytic oxidation treatment VOCs residual neat recovering systems based on absorption heat pump |
-
2016
- 2016-11-18 CN CN201621236383.3U patent/CN206222351U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107448965A (en) * | 2017-07-14 | 2017-12-08 | 兰州理工大学 | A kind of Novel incineration furnace fume afterheat depth recovery and energy level lifting process system |
| CN108644796A (en) * | 2018-07-11 | 2018-10-12 | 上海环境工程设计研究院有限公司 | Catalytic oxidation treatment VOCs residual neat recovering systems based on absorption heat pump |
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