CN103759466A - Spraying-absorbing-type method and spraying-absorbing-type device for waste heat recovery of fuel-gas flue gas - Google Patents
Spraying-absorbing-type method and spraying-absorbing-type device for waste heat recovery of fuel-gas flue gas Download PDFInfo
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- CN103759466A CN103759466A CN201410012655.0A CN201410012655A CN103759466A CN 103759466 A CN103759466 A CN 103759466A CN 201410012655 A CN201410012655 A CN 201410012655A CN 103759466 A CN103759466 A CN 103759466A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 129
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000011084 recovery Methods 0.000 title claims abstract description 42
- 239000002918 waste heat Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002737 fuel gas Substances 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000007921 spray Substances 0.000 claims abstract description 77
- 238000010521 absorption reaction Methods 0.000 claims abstract description 51
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 14
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007789 gas Substances 0.000 claims description 41
- 239000000567 combustion gas Substances 0.000 claims description 31
- 239000000779 smoke Substances 0.000 claims description 31
- 239000006096 absorbing agent Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 230000009977 dual effect Effects 0.000 claims description 7
- 239000003517 fume Substances 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 230000002411 adverse Effects 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 230000000505 pernicious effect Effects 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
-
- 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]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
-
- 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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- Treating Waste Gases (AREA)
Abstract
The invention discloses a spraying-absorbing-type method and a spraying-absorbing-type device for waste heat recovery of fuel-gas flue gas. Fuel gas drives a generator to combust, released energy is taken as a high-temperate heat source for a absorption refrigerating machine, flue gas generated after combustion is mixed with boiler flue gas, and the mixed flue gas enters n-level spraying elements, directly contacts with spray water in the spraying elements to be evaporated and cooled, and are then exhausted from a flue-gas outlet; automatic-circulation water enters a first-level spraying unit from a spraying-element circular-water inlet to be sprayed, outlet water of each level spraying unit is delivered to a next spraying element under the action of a spraying water pump to be sprayed, outlet water of the nth-level spraying element is pumped into an evaporator from a chilled-water inlet of the evaporator by a circulating water pump to be cooled, and cooled chilled water is delivered to the first-level spraying unit to complete automatic circulation of the spray water. By the method, energy can be effectively saved, heating capacity can be effectively improved, SO2 (sulfur dioxide) and NOx (nitrogen oxides) in the flue gas are removed, and pollution of the flue gas to environment is reduced.
Description
Technical field
The invention belongs to energy field, be specifically related to method and the device of the absorption combustion gas flue gas waste heat recovery of a kind of novel spray.
Background technology
At present, gas-fired equipment is widely used in China, and the direct burning of natural gas can produce a large amount of high-temperature flue gas, and flue gas not only carries a large amount of waste heats, also contains NO
xand SO
2deng pernicious gas, to the recycling of fume afterheat, remove the key that noxious pollutant in flue gas etc. becomes fuel gas combustion equipment energy-saving and emission-reduction.Flue gas after combustion of natural gas not only temperature is very high, and contains a large amount of steam, and wherein the condensation heat of steam accounts for the more than 70% of fume afterheat.Current flue gas waste heat recovery apparatus mainly contains two classes, and the one, by the mediate contact of flue gas and water, carry out heat exchange and carry out the sensible heat of flue gas and reclaim; The 2nd, the low-temperature receiver that Absorption Refrigerator etc. are prepared low temperature contacts with the direct or indirect of water by flue gas, and the latent heat of the sensible heat of flue gas and steam is reclaimed simultaneously.
Thereby existingly by flue gas and water direct or indirect, contact and carry out heat exchange and carry out the patent of flue gas waste heat recovery and have: (1) patent of invention CN200710100388.2 discloses a kind of water spray type thin plastic film flue gas waste heat recovery and desulfurizer.This device carries out the mediate contact formula countercurrent flow of cigarette G&W by film, but its fume side resistance is larger.(2) patent of invention CN200720048437.8 discloses a kind of waste heat recovery energy-saving device of flue.This device makes flue gas and water direct contact type heat exchange by install feedwater atomizing sprayer additional on flue, thereby the flue gas being discharged in flue is carried out to recuperation of heat, this device is only parts in flue gas waste heat recovery system, and how the source of shower water and the fume afterheat of recovery are used in system all less than discussing.The patent that existing utilization Absorption Refrigerator reclaims the sensible heat of flue gas and latent heat simultaneously has: (3) patent of invention CN201210576484.5 discloses a kind of direct-burning lithium bromide absorption cold-hot water assembing group of Mist heat recovering.This unit is transformed direct combustion type lithium bromide absorption machine, in Central Air-Conditioner high pressure generator smoke evacuation outlet, flue gas condensing heat exchanger is set, use chilled water and weak solution to carry out recuperation of heat to the smoke evacuation of unit itself, improve unit efficiency, flue gas-the condensing heat exchanger of this device is the mode of flue gas and water mediate contact, corrosion resistance to condensing heat exchanger material is had relatively high expectations, and the flue gas resistance of condensing heat exchanger also can be larger.(4) patent of invention CN201010238743.4 discloses a kind of flue gas waste heat recovery system based on solution absorption cycle.This system comprises generator, condenser, absorber, flue gas from boiler etc. passes into respectively generator, condenser and absorber, heat dilute solution in generator, in condenser with cooling water heat exchange, in absorber, emit latent heat with weak solution countercurrent flow, this unit can utilize the flue gas of different grades, but because it is by a plurality of parts in flue gas drawing-in system, device more complicated, and device each several part solution flue gas corrosion problem has been proposed again to higher requirement.(5) utility model patent CN201120133195.9 discloses a kind of central heating system that utilizes absorption heat pump Mist heat recovering.This system adopts flue gas and water direct contact heat-exchanging to carry out waste heat recovery, but because this system is to be in series by a plurality of different parts such as absorption type heat pump assembly, spray equipments, its floor space is larger, and very high for the requirement of construction.
Also there is engineering that the flue gas heat recovery technology of absorption circulation and gas-water heat exchange is used in same project, but because the plant area area of every part wherein is larger, and device compact not laying cost and the resistance of ducting that has increased smoke pipe and water pipe that distribute, making to research and develop a kind of integrated device that can two kinds of technology of reasonable combination becomes inevitable developing direction.And above-mentioned flue gas waste heat recovery method or device are only generally the recovery of considering sensible heat and latent heat in flue gas, to removing contained NO in flue gas
xand SO
2consideration Deng pernicious gas is less, and investigation is recently found, NO
xbe the main source of PM2.5 in atmosphere, therefore, in Mist heat recovering, remove the NO in smoke evacuation
xand SO
2also become very necessary.Thus, the present invention proposes the absorption combustion gas flue gas waste heat recovery of a kind of novel spray integrated device, the unit of this spray-absorption integral type not only utilizes absorption refrigeration module and the direct contact modules of gas-water to realize the condensation heat of steam in flue gas and reclaims, and can also in recuperation of heat, absorb the NO in flue gas
xand SO
2deng pernicious gas, realized energy-conservation, reduction of discharging simultaneously, prepare a large amount of condensed waters simultaneously, can be used as the moisturizing of boiler etc., the technique of all-in-one has also effectively been saved floor space simultaneously, structure is compacter, saves pipeline production cost and conveying energy consumption and construction technology is simplified, and the duration shortens greatly.
Summary of the invention
The method and the device that the object of the present invention is to provide a kind of spray-absorption formula combustion gas flue gas waste heat recovery, this device is a kind of unit of spray-absorption integral type, and structure is compacter, and cost is lower.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of method of spray-absorption formula combustion gas flue gas waste heat recovery, the method comprises the steps: that combustion gas enters the generator of Absorption Refrigerator 27, the heat that burning discharges is as the high temperature heat source of Absorption Refrigerator 27, and the flue gas of discharge mixes at waste heat recovery smoke inlet 8 with boiler smoke; Mixed flue gas enters n level spray unit 5 and directly contacts and carry out evaporative cooling with shower water wherein, and the flue gas after cooling exports 9 discharge, wherein 2≤n≤20 by discharging fume; Said n level spray unit 5 forms to n level spray unit by the 1st grade that connects successively against flow of flue gas direction, first recirculated water enter the 1st grade of spray unit and spray, the water outlet of every grade of spray unit is squeezed into next stage spray unit by feeding spraying pump 11 and is proceeded spray, the water outlet of n level spray unit is recycled water pump 15 and is transported to evaporimeter 4, low-temperature heat source as Absorption Refrigerator 27 is lowered the temperature, chilled water after cooling is transported to the 1st grade of spray unit again, thereby has realized the circulation of recirculated water in n level spray unit 5; Heat supply network backwater carries out preheating by the absorber 3 of Absorption Refrigerator 27 with condenser 2 successively, and water outlet is delivered to boiler.
The generator of above-mentioned Absorption Refrigerator 27 has following two kinds of implementations: a kind of mode is that the structure of utilizing gas driven high pressure generator 19 and flue gas to drive low pressure generator 20 to form realizes, first combustion gas enters gas driven high pressure generator 19, the flue gas of discharging after burning mixes with boiler smoke, mixed flue gas enters flue gas again and drives low pressure generator 20 to lower the temperature, the heat of flue gas cool-down is with the heat of burning release jointly as the high temperature heat source of Absorption Refrigerator 27, and the mixed flue gas after cooling is transported to n level spray unit 5; Or another kind of mode adopts single gas driven generator 1 to realize, combustion gas enters gas driven generator 1, and the flue gas of discharging after burning mixes with boiler smoke, obtains mixed flue gas, and mixed flue gas enters n level and sprays unit 5.
A kind of method of preferred spray-absorption formula combustion gas flue gas waste heat recovery, above-mentioned mixed flue gas is introduced into gas-water indirect heat exchanger 18, with by absorber 3 and the heat supply network backwater of condenser 2 preheatings, carry out adverse current indirect heat exchange successively, heat supply network backwater is warmed, mixed flue gas is lowered the temperature, mixed flue gas after precooling enters n level spray unit 5, and the heat supply network backwater of mixed flue gas is delivered to boiler.
By desulfurization module 23, to n level spray unit, carry alkali lye, recirculated water is adjusted to soda acid neutrality, by denitration module 24, to the 1st grade of spray unit, carry denitration medicament, for absorbing nitrogen oxide and the sulfur dioxide gas of mixed flue gas.
On the outer wall of n level spray unit, spilling water valve 25 is set, discharges the condensed water that waste heat recovery produces; At waste heat recovery smoke inlet 8 and smoke evacuation outlet 9, be provided with water fender 26, prevent that shower water from entering flue.
A spray-absorption formula combustion gas flue gas waste heat recovery apparatus, this device comprises that the Absorption Refrigerator 27 of bottom and the gas-water on top directly contact spray chamber; Owing to having open type liquid level in device, thereby device is divided into up-down structure, and by open type liquid level, gas-water directly contacts spray chamber and is placed in highest point; Bottom is mainly the Absorption Refrigerator for absorption circulation; Above-mentioned Absorption Refrigerator 27 comprises generator, condenser 2, absorber 3 and evaporimeter 4; Above-mentioned gas-water directly contacts spray chamber and forms to n level spray unit by the 1st grade that connects successively against flow of flue gas direction, wherein 2≤n≤20; The delivery port of every grade of spray unit is connected with the water inlet of next stage spray unit by feeding spraying pump 11 and corresponding water lines, the delivery port of n level spray unit is connected with evaporimeter chilled water inlet 13 by water circulating pump 15 and corresponding water lines, and evaporimeter chilled water outlet 14 is connected with the spray unit circulating water intake 10 of the 1st grade of spray unit.
At above-mentioned smoke inlet 8 and gas-water, directly contact the gas-water indirect heat exchanger 18 of connecting between spray chamber, the water inlet of gas-water indirect heat exchanger 18 is connected with the coolant outlet of condenser 2, and the delivery port of gas-water indirect heat exchanger 18 is connected with boiler.
Above-mentioned generator is gas driven generator 1 or combustion gas flue gas Dual Drive source generator, and this combustion gas flue gas Dual Drive source generator drives low pressure generator 20 to form by gas driven high pressure generator 19 and flue gas; The exhanst gas outlet of gas driven generator 1 is connected with waste heat recovery smoke inlet 8; In combustion gas flue gas Dual Drive source generator, the exhanst gas outlet of gas driven high pressure generator 19 drives low pressure generator gas approach 21 to be connected with flue gas, and flue gas drives low pressure generator exhanst gas outlet 22 to be connected with waste heat recovery smoke inlet 8.
Beneficial effect of the present invention is: through the method for the full recuperation of heat of spray-absorption formula combustion gas flue gas of the present invention, by the flue gas degree of depth is cooling, flue-gas temperature is dropped to a large amount of latent heat of the following recovered flue gas of dew-point temperature, the sensible heat of flue gas and most of latent heat are recovered the waste heat as a secondary net backwater, can effectively save the energy and improve heat capacity, simultaneously the SO in flue gas
2, NO
xgas is effectively absorbed by shower water, has reduced the pollution of flue gas to environment.Meanwhile, floor space has effectively been saved in the design of spray-absorption formula combustion gas flue gas full heat recovery device of the present invention, and structure is compacter, saves pipeline production cost and conveying energy consumption and construction technology is simplified, and the duration shortens greatly.
Accompanying drawing explanation
Fig. 1 be a kind of spray-absorption formula combustion gas flue gas waste heat recovery Method And Principle figure;
Fig. 2 is the Method And Principle figure that Fig. 1 adds gas-water indirect heat exchanger;
Fig. 3 is the Method And Principle figure that Fig. 2 adds combustion gas flue gas Dual Drive source generator;
In figure: 1-gas driven generator, 2-condenser, 3-absorber, 4-evaporimeter, 5-n level spray unit, 6-fuel gas inlet, 7-gas driven generator exhanst gas outlet, 8-waste heat recovery smoke inlet, the 9-outlet of discharging fume, 10-spray unit circulating water intake, 11-feeding spraying pump, 12-spray unit circulating water outlet, the import of 13-evaporimeter chilled water, 14-evaporimeter chilled water outlet, 15-water circulating pump, the import of 16-hot net water, the outlet of 17-hot net water, 18-gas-water indirect heat exchanger, 19-gas driven high pressure generator, 20-flue gas drives low pressure generator, 21-flue gas drives low pressure generator smoke inlet, 22-flue gas drives low pressure generator exhanst gas outlet, 23-desulfurization module, 24-denitration module, 25-spilling water valve, 26-water fender, 27-Absorption Refrigerator.
The specific embodiment
The method and the device that the present invention proposes a kind of spray-absorption formula combustion gas flue gas waste heat recovery, be described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, then combustion gas enters gas driven generator 1 from fuel gas inlet 6, the high temperature heat source of Absorption Refrigerator 27 is provided, the flue gas of discharging mixes at waste heat recovery smoke inlet 8 with boiler smoke from gas driven generator exhanst gas outlet 7 is discharged, mixed flue gas enters n level spray unit 5, after cooling, from smoke evacuation outlet 9, discharges unit.
Wherein, self-circulating water enters the 1st grade of spray unit from spray unit circulating water intake 10 and sprays, the water outlet of every grade of spray unit is transported to next stage spray unit for spray under the effect of feeding spraying pump 11, the water outlet of n level spray unit is from spray unit circulating water outlet 12 is discharged, be recycled water pump 15 and be transported to evaporimeter 4 through evaporimeter chilled water inlet 13, low-temperature heat source as Absorption Refrigerator 27 is lowered the temperature, chilled water after cooling is discharged from evaporimeter chilled water outlet 14, be transported to the 1st grade of spray unit, thereby completed the circulation of self-circulating water in n level spray unit 5.Meanwhile, heat supply network backwater enters Absorption Refrigerator 27 from hot net water import 16, carries out preheating successively by absorber 3 and condenser 2, after preheating, from heat supply network water out 17, drains into boiler.
As shown in Figure 2, first mixed flue gas enters gas-water indirect heat exchanger 18, and be also transported to gas-water indirect heat exchanger 18 through the heat supply network backwater of absorber 3 and condenser 2 preheatings, same mixed flue gas wherein carries out adverse current indirect heat exchange, heat supply network backwater is continued to heat up, mixed flue gas is lowered the temperature, and the mixed flue gas after precooling enters n level spray unit 5 again and carries out coolingly, and the heat supply network backwater of mixed flue gas is delivered to boiler.
As shown in Figure 3, first combustion gas enters gas driven high pressure generator 19, the flue gas of discharging after burning drives low pressure generator smoke inlet 21 to mix with boiler smoke at flue gas, mixed flue gas enters flue gas and drives low pressure generator 20 to lower the temperature, the high temperature heat source of Absorption Refrigerator 27 is further provided, mixed flue gas after cooling drives low pressure generator exhanst gas outlet 22 to discharge from flue gas, through waste heat recovery smoke inlet 8, enter n level spray unit 5, thereby realized the multistage utilization to high-temperature flue gas grade.
In spray-absorption formula combustion gas flue gas waste heat recovery apparatus running, by desulfurization module 23, to n level spray unit, carry alkali lye, recirculated water is adjusted to soda acid neutrality, by denitration module 24, to the 1st grade of spray unit, carry denitration medicament, for absorbing nitrogen oxide and the sulfur dioxide gas of mixed flue gas.
In addition, on the outer wall of n level spray unit, spilling water valve 25 is set, discharges the condensed water that waste heat recovery produces; At waste heat recovery smoke inlet 8 and smoke evacuation outlet 9, be provided with water fender 26, prevent that shower water from entering flue.
Claims (8)
1. the method for a spray-absorption formula combustion gas flue gas waste heat recovery, it is characterized in that, the method comprises the steps: that combustion gas enters the generator of Absorption Refrigerator (27), the heat that burning discharges is as the high temperature heat source of Absorption Refrigerator (27), the flue gas of discharging mixes with boiler smoke, mixed flue gas enters n level spray unit (5) and directly contacts and carry out evaporative cooling with shower water wherein, and the flue gas after cooling is by outlet (9) discharge, wherein 2≤n≤20 of discharging fume; Described n level spray unit (5) forms to n level spray unit by the 1st grade that connects successively against flow of flue gas direction, first recirculated water enter the 1st grade of spray unit and spray, the water outlet of every grade of spray unit is squeezed into next stage spray unit by feeding spraying pump (11) and is sprayed, the water outlet of n level spray unit is recycled water pump (15) and is transported to evaporimeter (4), low-temperature heat source as Absorption Refrigerator (27) is lowered the temperature, chilled water after cooling is transported to the 1st grade of spray unit, thereby has realized the circulation of recirculated water in n level spray unit (5); Heat supply network backwater carries out preheating by the absorber (3) of Absorption Refrigerator (27) with condenser (2) successively, and water outlet is delivered to boiler.
2. method according to claim 1, it is characterized in that, the generator of described Absorption Refrigerator (27) has following two kinds of implementations: a kind of mode is for utilizing the structure that drives low pressure generator (20) to form by gas driven high pressure generator (19) and flue gas to realize, first combustion gas enters gas driven high pressure generator (19), the flue gas of discharging after burning mixes with boiler smoke, mixed flue gas enters flue gas again and drives low pressure generator (20) to lower the temperature, the heat that the heat of flue gas cool-down and burning discharge is jointly as the high temperature heat source of Absorption Refrigerator (27), mixed flue gas after cooling enters n level spray unit (5), or another kind of mode adopts single gas driven generator (1) to realize, combustion gas enters gas driven generator (1), and the flue gas of discharging after burning mixes with boiler smoke, and mixed flue gas enters n level and sprays unit (5).
3. method according to claim 1, it is characterized in that, described mixed flue gas is introduced into gas-water indirect heat exchanger (18), carry out adverse current indirect heat exchange with the heat supply network backwater by absorber (3) and condenser (2) preheating successively, heat supply network backwater is warmed, mixed flue gas is lowered the temperature, and the mixed flue gas after precooling enters n level spray unit (5), and the heat supply network backwater of mixed flue gas is delivered to boiler.
4. according to the method described in claims 1 to 3 any one, it is characterized in that, by desulfurization module (23), to n level spray unit, carry alkali lye, recirculated water is adjusted to soda acid neutrality, by denitration module (24), to the 1st grade of spray unit, carry denitration medicament, for absorbing nitrogen oxide and the sulfur dioxide gas of mixed flue gas.
5. according to the method described in claims 1 to 3 any one, it is characterized in that, on the outer wall of n level spray unit, spilling water valve (25) is set, discharge the condensed water that waste heat recovery produces; At waste heat recovery smoke inlet (8) and smoke evacuation outlet (9), be provided with water fender (26), prevent that shower water from entering flue.
6. a spray-absorption formula combustion gas flue gas waste heat recovery apparatus, is characterized in that, this device comprises that the Absorption Refrigerator (27) of bottom and the gas-water on top directly contact spray chamber; Described Absorption Refrigerator (27) comprises generator, condenser (2), absorber (3) and evaporimeter (4); Described gas-water directly contacts spray chamber and forms to n level spray unit by the 1st grade that connects successively against flow of flue gas direction, wherein 2≤n≤20; The delivery port of every grade of spray unit is connected with the water inlet of next stage spray unit by feeding spraying pump (11) and corresponding water lines, the delivery port of n level spray unit is connected with evaporimeter chilled water inlet (13) by water circulating pump (15) and corresponding water lines, and evaporimeter chilled water outlet (14) is connected with the spray unit circulating water intake (10) of the 1st grade of spray unit.
7. spray-absorption formula combustion gas flue gas waste heat recovery apparatus according to claim 6, it is characterized in that, at described smoke inlet (8) and gas-water, directly contact the gas-water indirect heat exchanger (18) of connecting between spray chamber, the water inlet of gas-water indirect heat exchanger (18) is connected with the coolant outlet of condenser (2), and the delivery port of gas-water indirect heat exchanger (18) is connected with boiler.
8. spray-absorption formula combustion gas flue gas waste heat recovery apparatus according to claim 6, it is characterized in that, described generator is gas driven generator (1) or combustion gas flue gas Dual Drive source generator, and this combustion gas flue gas Dual Drive source generator drives low pressure generator (20) to form by gas driven high pressure generator (19) and flue gas; The exhanst gas outlet of gas driven generator (1) is connected with waste heat recovery smoke inlet (8); In combustion gas flue gas Dual Drive source generator, the exhanst gas outlet of gas driven high pressure generator (19) drives low pressure generator gas approach (21) to be connected with flue gas, and flue gas drives low pressure generator exhanst gas outlet (22) to be connected with waste heat recovery smoke inlet (8).
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|---|---|---|---|
| CN201410012655.0A CN103759466B (en) | 2014-01-10 | 2014-01-10 | A kind of method and device of spray-absorption formula combustion gas flue gas waste heat recovery |
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|---|---|---|---|
| CN201410012655.0A CN103759466B (en) | 2014-01-10 | 2014-01-10 | A kind of method and device of spray-absorption formula combustion gas flue gas waste heat recovery |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105433422A (en) * | 2015-12-11 | 2016-03-30 | 凯天环保科技股份有限公司 | Tobacco curing exhausted damp heat recycling device and method |
| CN106440465A (en) * | 2016-08-31 | 2017-02-22 | 浙江浙能节能科技有限公司 | Energy-saving type thermal power plant flue gas moisture recovering system |
| CN106765268A (en) * | 2017-01-19 | 2017-05-31 | 清华大学 | A kind of residual heat from boiler fume depth retracting device |
| CN107328133A (en) * | 2017-07-17 | 2017-11-07 | 昊姆（上海）节能科技有限公司 | Direct combustion type open type absorbent unit |
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| CN106440465A (en) * | 2016-08-31 | 2017-02-22 | 浙江浙能节能科技有限公司 | Energy-saving type thermal power plant flue gas moisture recovering system |
| CN106765268A (en) * | 2017-01-19 | 2017-05-31 | 清华大学 | A kind of residual heat from boiler fume depth retracting device |
| CN106765268B (en) * | 2017-01-19 | 2022-07-26 | 清华大学 | Boiler flue gas waste heat degree of depth recovery unit |
| CN107328133A (en) * | 2017-07-17 | 2017-11-07 | 昊姆（上海）节能科技有限公司 | Direct combustion type open type absorbent unit |
| CN107687648A (en) * | 2017-09-26 | 2018-02-13 | 江苏中圣高科技产业有限公司 | The high-efficiency energy-saving ring insurance system that a kind of residual heat from boiler fume utilizes |
| CN109489057A (en) * | 2018-12-06 | 2019-03-19 | 清华大学 | The absorption boiler flue gas treatment system of twin-stage |
| CN109489057B (en) * | 2018-12-06 | 2024-03-12 | 清华大学 | Double-stage absorption type boiler flue gas treatment system |
| CN114234212A (en) * | 2021-11-18 | 2022-03-25 | 浙江菲达环保科技股份有限公司 | Waste heat utilization type zeolite rotating wheel catalytic oxidation VOCs treatment system and method |
| CN115234929A (en) * | 2022-07-27 | 2022-10-25 | 中勘精旺新能源科技发展有限公司 | Burning flue gas quenching spraying equipment |
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