CN207729639U - A kind of flue gas waste heat recovery system - Google Patents
A kind of flue gas waste heat recovery system Download PDFInfo
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- CN207729639U CN207729639U CN201721222625.8U CN201721222625U CN207729639U CN 207729639 U CN207729639 U CN 207729639U CN 201721222625 U CN201721222625 U CN 201721222625U CN 207729639 U CN207729639 U CN 207729639U
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000003546 flue gas Substances 0.000 title claims abstract description 67
- 239000002918 waste heat Substances 0.000 title claims abstract description 65
- 238000011084 recovery Methods 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 325
- 239000007789 gas Substances 0.000 claims abstract description 78
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 238000000605 extraction Methods 0.000 claims abstract description 20
- 230000008602 contraction Effects 0.000 claims abstract description 11
- 239000007921 spray Substances 0.000 claims description 73
- 239000000779 smoke Substances 0.000 claims description 27
- 238000005507 spraying Methods 0.000 claims description 23
- 230000007704 transition Effects 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 11
- 239000007800 oxidant agent Substances 0.000 claims description 7
- 230000001590 oxidative effect Effects 0.000 claims description 7
- 239000000284 extract Substances 0.000 abstract 2
- 239000002737 fuel gas Substances 0.000 abstract 1
- 239000003595 mist Substances 0.000 description 18
- 238000002485 combustion reaction Methods 0.000 description 8
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 125000004122 cyclic group Chemical group 0.000 description 3
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Chimneys And Flues (AREA)
Abstract
The utility model discloses a kind of flue gas waste heat recovery systems, including chimney and waste heat extract and utilize mechanism, wherein, chimney includes the chimney raft section set gradually upwards from bottom, drip tray, chimney changeover portion, water dish, chimney contraction section and chimney emission section, wherein chimney raft section is connect by boiler flue with boiler, it is additionally provided with water outlet in chimney raft section, the water outlet of chimney raft section and the water outlet of drip tray are respectively communicated to waste heat extraction and intermediary's circulating water intake using mechanism, waste heat extracts and is connected to using intermediary's circulating water outlet of mechanism the water inlet of water dish；And waste heat extraction and fuel gas inlet and help gas outlet, combustion-supporting gas outlet to boiler using being provided with to help in mechanism.The system cost is low, floor space is small and flue gas waste heat recovery rate is high.
Description
Technical Field
The utility model relates to an energy-conserving technical field especially relates to a flue gas waste heat recovery system suitable for chimney.
Background
The flue gas generated by boiler combustion contains a large amount of heat energy, so that not only is energy wasted through direct emission, but also 'white smoke' can be generated after the water vapor in the flue gas meets the condensation of cold combustion-supporting gas, and the combustion-supporting gas is polluted. In the prior art, a heat pump is usually adopted to directly recover the waste heat of the flue gas, or an external water pump continuously supplies water in a spraying mode to remove dust. However, the former has high investment and large occupied area; the hot water obtained by the latter contains a large amount of harmful substances, and if the hot water is required to be purified layer by layer, the cost is increased, and a part of heat is wasted in the purification process, so that the heat recovery rate is reduced.
Therefore, how to recover the flue gas waste heat with low cost and high efficiency becomes a technical problem to be solved urgently in the field of energy conservation.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a flue gas waste heat recovery system with low costs, area is little and flue gas waste heat recovery rate is high.
According to the utility model discloses a flue gas waste heat recovery system, contain chimney and waste heat extraction and utilization mechanism, wherein, the chimney contains the chimney foundation section, the water collector, the chimney changeover portion, the water spray tray, chimney contraction section and the chimney exhaust section that set gradually from the bottom upwards, wherein the chimney foundation section is connected with the boiler through the boiler flue, still be provided with the delivery port on the chimney foundation section, the delivery port of chimney foundation section and the delivery port of water collector communicate respectively to waste heat extraction and the intermediary circulating water import of utilizing the mechanism, waste heat extraction and the intermediary circulating water export of utilizing the mechanism communicate to the water inlet of water spray tray; and the waste heat extracting and utilizing mechanism is provided with a combustion-supporting gas inlet and a combustion-supporting gas outlet, and the combustion-supporting gas outlet is communicated to the boiler.
Further, the waste heat extraction and utilization mechanism comprises a spray type heat exchanger, the spray type heat exchanger comprises a first combustion-supporting gas inlet, a first combustion-supporting gas outlet, a first water inlet, a first water outlet, a first water pump and a second water pump, wherein,
the first combustion-supporting gas inlet is communicated with air;
the first combustion-supporting gas outlet is communicated with the boiler;
the first water inlet is connected with the water pan through a first water pump; and
the first water outlet is connected with the water spraying disc through a second water pump.
Further, the waste heat extracting and utilizing mechanism also comprises a heat-net type heat exchanger, the heat-net type heat exchanger comprises a second water inlet, a second water outlet, a heat-net water inlet, a heat-net water outlet and a third water pump, wherein,
the second water inlet is connected with a water outlet at the bottom of the chimney foundation section through a third water pump; and
the second water outlet is connected with the water spraying disc.
Further, the waste heat extraction and utilization mechanism also comprises a combustion-supporting gas drying device arranged between the spray type heat exchanger and the boiler, the combustion-supporting gas drying device comprises a second combustion-supporting gas inlet, a second combustion-supporting gas outlet, a third water inlet, a third water outlet, a first valve and a second valve, wherein,
the second combustion-supporting gas inlet is connected with the first combustion-supporting gas outlet;
the second combustion-supporting gas outlet is connected with a combustion-supporting gas inlet of the boiler;
the third water inlet is connected with the second water outlet through a first valve; and
the third water outlet is connected with the water spraying disc through a second valve.
Further, the waste heat extracting and utilizing mechanism further comprises a third valve, wherein the third valve is connected with the combustion-supporting gas drying device in parallel.
Furthermore, the water spray disk comprises a plurality of spray water pipes which are arranged at intervals, the plurality of spray water pipes are communicated with the water inlet pipe of the water spray disk, and a plurality of downward nozzles are uniformly arranged on the plurality of spray water pipes; or,
the spray tray contains inlet tube, discoid body, equidistant parallel distribution in the filtration cigarette hole of a plurality of rectangular shapes on discoid body to and a plurality of nozzles of evenly distributed in discoid body bottom.
Furthermore, the water receiving tray comprises a water receiving groove with a circular ring-shaped cross section and a through hole positioned in the center of the water receiving groove, the outer diameter of the water receiving groove is equal to the inner diameter of the transition section of the chimney, and the inner diameter of the water receiving groove is reduced along with the increase of the height of the water receiving groove.
Further, the diameter of the chimney base section is D1The diameter of the transition section of the chimney is D2The diameter of the smoke discharging section of the chimney is D3The diameter of the upper end surface of the chimney contraction section is D3And a lower end face diameter D2Wherein D is1＝D2>2D3。
The foundation the utility model discloses a method of flue gas waste heat recovery, its characterized in that contains:
(1) starting a flue gas waste heat recovery system, and spraying water mist from a nozzle of a water spraying disc;
(2) the water mist exchanges heat with the flue gas at a transition section of the chimney, so that water vapor in the flue gas is condensed into water;
(3) the water mist and water formed by condensation in the flue gas are combined together, one part of the water mist falls into a water receiving tank of a water receiving tray to obtain primary intermediate circulating water, the other part of the water mist enters a chimney foundation section through a through hole of the water receiving tray to exchange heat with the flue gas with higher temperature, the temperature of the flue gas is further increased, and the flue gas falls to the bottom of the chimney foundation section to obtain secondary intermediate circulating water;
(4) first-stage intermediate circulating water in the water receiving tank is pumped into the spray type heat exchanger by a first water pump to heat combustion-supporting gas entering the spray type heat exchanger from the external environment, the first valve and the second valve are closed, the third valve is opened, and the heated combustion-supporting gas further enters the boiler to assist combustion;
(5) the first-stage intermediate circulating water with reduced temperature obtained after the first-stage intermediate circulating water is subjected to heat energy extraction by the spray type heat exchanger is pumped to the water spray disc by the second water pump to form water mist;
(6) secondary intermediate circulating water in the bottom of the chimney base section is pumped into the heat supply network water heat exchanger by a third water pump to directly heat the heat supply network water; and
(7) the secondary intermediate circulating water with reduced temperature obtained after the secondary intermediate circulating water heats the heat supply network water directly enters the water spraying disc to form water mist.
Further, the method further comprises: and opening the first valve and the second valve and closing the third valve, and heating and drying the heated combustion-supporting gas in the dividing wall type heat exchanger by the secondary intermediate circulating water.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the advantages of as follows:
(1) the utility model discloses a flue gas waste heat recovery system simple structure, convenient operation, it is with low costs.
(2) The utility model discloses a flue gas waste heat recovery system uses spraying system, not only can retrieve the waste heat in the flue gas, can also absorb the vapor in the flue gas, purifies the flue gas.
(3) The utility model discloses a flue gas waste heat recovery system cyclic utilization intermediary circulating water practices thrift the cost.
(4) The utility model discloses a flue gas waste heat recovery system does not directly utilize intermediary's circulating water, but comes indirect heat of retrieving intermediary's circulating water through the heat exchanger, need not to carry out purification treatment to intermediary's circulating water, simplifies the waste heat recovery process.
(5) The utility model discloses a flue gas waste heat recovery system collects the intermediary circulating water respectively bottom water collector and chimney to provide the heat for different equipment through the heat exchanger that corresponds separately, make waste heat utilization more abundant.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1a and 1b are schematic diagrams of an embodiment of a flue gas waste heat recovery system according to the present invention.
Fig. 2a and fig. 2b are schematic diagrams of a flue gas waste heat recovery system according to another embodiment of the present invention.
Fig. 3a and 3b are sectional views of the water spray disk according to the embodiment of the present invention.
Fig. 4a and 4b are sectional views of a water spray disk according to another embodiment of the present invention.
Fig. 5a and 5b are cross-sectional views of the water pan in the embodiment of the present invention.
Description of reference numerals:
101 boiler, 102 chimney base section, 103 chimney transition section, 104 water pan, 141 through hole, 142 water receiving tank, 105 chimney contraction section, 106 water spray pan, 161 water inlet pipe, 162 spray header, 163 nozzle, 164 body, 165 smoke filter hole, 107 spray heat exchanger, 171 first combustion-supporting gas inlet, 172 first combustion-supporting gas outlet, 173 first water inlet, 174 first water outlet, 175 first water pump, 176 second water pump, 108 heat net type heat exchanger, 181 second water inlet, 182 second water outlet, 183 heat net water inlet, 184 heat net water outlet, 185 third water pump, 109 dividing wall type heat exchanger, 191 second combustion-supporting gas inlet, 192 second combustion-supporting gas outlet, 193 third water inlet, 194 third water outlet, 195 first valve, 196 second valve, 197 third valve, 110 smoke exhaust section.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Fig. 1a and 1b show an embodiment of a flue gas waste heat recovery device according to the present invention. In this embodiment, the flue gas waste heat recovery device comprises a chimney and a waste heat extraction and utilization mechanism.
The chimney comprises a chimney base section 102, a water receiving disc 104, a chimney transition section 103, a water spraying disc 106, a chimney contraction section 105 and a chimney smoke exhaust section 110 which are sequentially arranged from bottom to top, wherein the chimney base section 102 is connected with the boiler 101 through a boiler flue, so that a large amount of high-temperature smoke generated by combustion in the boiler 101 enters the chimney through the boiler flue. The material of each part of the chimney can be determined according to the smoke components. As shown, the diameter of the chimney base section 102 is D1Chimney transition section 103 diameter D2The diameter of the chimney exhaust section 110 is D3The chimney contraction section 105 is in a circular truncated cone shape and is used for connecting the chimney transition section 103 and the chimney smoke exhaust section 110, and the diameter of the upper end surface of the chimney contraction section is D3And a lower end face diameter D2. In the utility modelIn the embodiment of the die, the relation between the diameters of the sections is required to satisfy D1＝D2>2D3The specific diameter can be designed according to factors such as the smoke discharge amount. In addition, a water outlet is also arranged on the chimney base section 102, the water outlet and the water outlet of the water receiving tray 104 are respectively communicated to an intermediate circulating water inlet of the waste heat extracting and utilizing mechanism, and an intermediate circulating water outlet of the waste heat extracting and utilizing mechanism is communicated to a water inlet of the water spraying tray 106. The embodiment of the utility model provides an in, waste heat draws and utilizes and is provided with combustion-supporting gas import and combustion-supporting gas export on the mechanism to this combustion-supporting gas export communicates to boiler 104, so that utilize the supplementary burning of intermediary circulating water heating combustion-supporting gas.
The water spray disk 106 is arranged between the chimney transition section 103 and the chimney contraction section 105 and is used for spraying intermediate circulating water to the bottom of the chimney. As shown in fig. 3a and 3b, the water spray disk 106 may include a plurality of spray pipes 161 arranged at intervals, the spray pipes 161 are communicated with the inlet pipe 162 of the water spray disk 106, and a plurality of downward nozzles 162 are uniformly arranged on the spray pipes 161. Because the plurality of spray pipes 161 are arranged on the water spray disk 106 at intervals, the intervals formed by the plurality of spray pipes 161 provide channels for the rising of the flue gas, and meanwhile, the spray pipes 161 can also slow down the rising speed of the flue gas, so that the heat exchange is more sufficient.
Alternatively, as shown in fig. 4a and 4b, in another embodiment of the present invention, the water spraying plate 106 may comprise a water inlet pipe 161, a disk-shaped body 164, smoke filtering holes 165, and a plurality of nozzles 163 uniformly distributed at the bottom of the disk-shaped body 161. The diameter of the disc-shaped body 161 should be equal to the diameter of the chimney transition section 103, so as to be disposed between the chimney transition section 103 and the chimney contraction section 105. The water mist sprayed from the water spray disk 106 is in sufficient contact with the flue gas rising in the chimney so as to carry away the heat in the flue gas and condense the water vapor therein into water drops. Specifically, the shape, size and distribution of the smoke filter 165 will have a certain effect on the recovery of the waste heat of the flue gas: smoke filtering holes 165 are too small or densely distributed, which can affect the rising of smoke; too large or too thin distribution can not make the flue gas fully contact with the intermediate circulating water, and the waste heat recovery rate is influenced; the different shapes of the smoke filtering holes 165 distributed on the water spray disk 106 will affect the flow of the medium circulating water in the water spray disk 106 differently. In the embodiment of the present invention, the water spray disk 106 may be a grid type water spray disk, i.e. a plurality of strip smoke filtering holes 165 are distributed on the water spray disk 106 in parallel at equal intervals. Compared with smoke filtering holes in other shapes such as circular shape, the strip-shaped smoke filtering holes 165 can enable the intermediate circulating water in the water spraying disc 106 to flow along a straight line, and even if the smoke filtering holes are densely arranged, the smooth water flow can be ensured. The width of the strip-shaped smoke filtering holes 165 and the distance between adjacent smoke filtering holes can be designed according to factors such as the size of a chimney and the smoke discharging amount, so that the smoke can be fully contacted with the intermediate circulating water, and the discharge of the smoke cannot be influenced.
The water pan 104 is arranged between the chimney transition section 103 and the chimney base section 102. As shown in fig. 4a and 4b, the water receiving tray 104 is a water receiving tank 142 with a circular cross section and a through hole 141 located in the center, and the outer diameter of the water receiving tank 142 is equal to the inner diameter of the chimney transition section 103 so as to be disposed between the chimney base section 102 and the chimney transition section 103. The inner diameter of the water receiving groove 142 decreases with the increase of the height of the water receiving groove 142, and a circular truncated cone-shaped through hole 141 is formed at the center of the water receiving groove 142. Set up the through-hole 141 of water collector 104 into the taper hole to it is that the osculum of taper hole is close to water spray tray 106, can make the heat exchange area increase, thereby further improve heat exchange efficiency, the gas fume rises to the osculum from the macrostoma of taper hole simultaneously, can slow down the ascending speed of gas fume, makes the heat exchange more abundant. The water mist sprayed by the water spray disc 106 is in full contact with the high-temperature flue gas at the transition section 103 of the chimney for heat exchange, so that water vapor in the flue gas is condensed into water, the condensed water and the water mist are combined together, and a part of the condensed water falls into the water receiving tank 142 to form primary circulating intermediate circulating water; the other part enters the chimney base section 102 through a through hole of the water receiving tray 104 to be in full contact with the flue gas with higher temperature for heat exchange, and the flue gas is converged and condensed to form water, and the water falls into the bottom of the chimney base section 102 together to form secondary circulation intermediate circulating water. Part of the intermediate circulating water formed by condensation in the chimney transition section 103 and sprayed by the spray disk 106. Since the flue gas temperature in the chimney base section 102 is higher than the flue gas temperature in the chimney transition section 103, the temperature of the secondary intermediate circulating water stored at the bottom of the chimney is higher than the temperature of the water receiving tank 142 and the intermediate circulating water.
The waste heat extraction and utilization mechanism comprises a spray type heat exchanger 107, the spray type heat exchanger 107 is connected with the water receiving tray 104 and collects heat of intermediate circulating water received by the water receiving tray 104, and the spray type heat exchanger 107 comprises a first combustion-supporting gas inlet 171, a first combustion-supporting gas outlet 172, a first water inlet 173, a first water outlet 174, a first water pump 175 and a second water pump 176. Specifically, the first combustion-supporting gas inlet 171 is connected to the external environment, and the combustion-supporting gas enters the spray heat exchanger through the first combustion-supporting gas inlet 171. The first combustion-supporting gas outlet 172 is connected with the combustion-supporting gas inlet 11 of the boiler 101, and the combustion-supporting gas heated in the spray heat exchanger enters the boiler 101 through the combustion-supporting gas inlet 11 to assist combustion. The first water inlet 173 is connected with the water pan 104 through a first water pump 175, and first-stage intermediate circulating water in the water pan 104 is sent into the spray heat exchanger through the first water pump 175; the first water outlet 174 is connected with the water spray disk 106 through the second water pump 176, and the intermediate circulating water in the spray-type heat exchanger is sent to the water spray disk 106 through the second water pump 176 to continuously spray the intermediate circulating water into the chimney, so that the cyclic use of the intermediate circulating water is realized.
Further, the waste heat extraction and utilization mechanism may further comprise a heat-screen heat exchanger 108, the heat-screen heat exchanger 108 is connected with the water outlet of the chimney base section 102 and collects heat of the medium circulating water at the bottom of the chimney, and the heat-screen heat exchanger comprises a second water inlet 181, a second water outlet 182, a heat-network water inlet 183, a heat-network water outlet 184 and a third water pump 185. Specifically, the second water inlet 181 and the third water pump 185 are connected to the bottom of the chimney, and the second-stage intermediate circulating water stored at the bottom of the chimney is pumped into the heat-net-type heat exchanger 108 by the third water pump 185. The second water outlet 182 is connected with the water spray disc 106, the heat supply network water enters the heat supply network heat exchanger from the heat supply network water inlet 183, is heated and heated by the secondary intermediate circulating water and then flows out from the heat supply network water outlet 184, the secondary intermediate circulating water transfers heat to the heat supply network water in the heat supply network heat exchanger 108, then flows to the water spray disc 106 from the second water outlet 182 and continuously sprays the intermediate circulating water into the chimney, and the cyclic use of the intermediate circulating water is realized.
Fig. 2a and 2b show a further embodiment according to the invention. The waste heat extraction and utilization mechanism further comprises a combustion-supporting gas drying device 109 arranged between the spray heat exchanger 107 and the boiler 101 so as to further dry the combustion-supporting gas heated by the spray heat exchanger 107 and assist combustion. In this embodiment, the oxidant gas drying device 109 includes a dividing wall type heat exchanger 109, a second oxidant gas inlet 191, a second oxidant gas outlet 192, a third water inlet 193, a third water outlet 194, a first valve 195, and a second valve 196. Specifically, the second combustion-supporting gas inlet 191 is connected to the first combustion-supporting gas outlet 172 to receive the moist heat-supporting gas heated by the spray heat exchanger 107; the second combustion-supporting gas outlet 192 is communicated with the boiler 101, and the hot combustion-supporting gas after being dried and heated is sent to the boiler 101 for supporting combustion; the third water inlet 193 is connected with the second water outlet 182 through the first valve 195, and the third water outlet 104 is connected with the water spray tray 106 through the second valve 106, so that the intermediate circulating water flows to the water spray tray 106 to continuously spray water mist into the chimney after being cooled for the second time, thereby realizing the recycling of the intermediate circulating water. In this embodiment, the heat of the intermediate circulating water flowing out of the heat-net type heat exchanger 108 is used to further heat and dry the combustion-supporting gas, so that the waste heat of the flue gas is more fully utilized. Preferably, the flue gas waste heat recovery system may further include a third valve 197 connected in parallel with the combustion-supporting gas drying device 109, so that an operator can selectively open/close the combustion-supporting gas drying device 109.
The utility model discloses a recovery method of flue gas waste heat recovery system as follows:
(1) starting a flue gas waste heat recovery system, and spraying water mist from a nozzle 163 of the water spraying disc 106;
(2) the water mist exchanges heat with the flue gas at a transition section 103 of the chimney, so that water vapor in the flue gas is condensed into water;
(3) the water mist and water condensed in the flue gas are combined together, one part of the water mist falls into a water receiving tank 142 of a water receiving tray 104 to obtain primary intermediate circulating water, the other part of the water mist enters a chimney base section 102 through a through hole 141 of the water receiving tray 104 to exchange heat with the flue gas with higher temperature, the temperature of the flue gas is further increased, and the flue gas falls to the bottom of the chimney base section 102 to obtain secondary intermediate circulating water;
(4) first-stage intermediate circulating water in the water receiving tank is pumped into the spray type heat exchanger by a first water pump to heat combustion-supporting gas entering the spray type heat exchanger from the external environment, and the heated combustion-supporting gas further enters a boiler to assist combustion;
(5) the first-stage intermediate circulating water with reduced temperature obtained after the first-stage intermediate circulating water is subjected to heat energy extraction by the spray type heat exchanger is pumped to the water spray disc by the second water pump to form water mist;
(6) secondary intermediate circulating water in the bottom of the chimney base section is pumped into the heat supply network water heat exchanger by a third water pump to directly heat the heat supply network water; and
(7) the secondary intermediate circulating water with reduced temperature obtained after the secondary intermediate circulating water heats the heat supply network water directly enters the water spraying disc to form water mist.
In the step (4), when the hot combustion-supporting gas entering the boiler 101 needs to be dried, the first valve 195 and the second valve 196 are opened, the third valve 197 is closed, and the intermediate circulating water enters the dividing wall type heat exchanger to heat and dry the humid high-temperature combustion-supporting gas; when the dry combustion-supporting gas is not needed to be provided, the first valve 195 and the second valve 196 are closed, the third valve 197 is opened, the intermediate circulating water directly flows to the water spraying disc 106 to continuously spray the intermediate circulating water into the chimney, and the recycling of the intermediate circulating water is realized. Alternatively, the first valve 195, the second valve 196 and the third valve 197 may be opened simultaneously to heat dry the wet high temperature combustion supporting gas with a portion of the intermediate circulating water flowing out of the heat grid heat exchanger 108.
Through the process, the utility model discloses design into direct fountain heat transfer device with chimney itself, the spray water fog spouts the back earlier in chimney changeover portion 103 with the flue gas heat transfer after the temperature reduces, water vapor condensation in the flue gas is water, the water that condenses in water spray disc 106 spun water smoke and the flue gas is in the same place, partly catch by water receiving tank 142 and get into the gas of helping with heating in spray heat exchanger 107 through water pump 11, another part carries out the heat transfer with the higher flue gas of temperature in to chimney foundation section 102, collect the bottom at chimney foundation section 102, get into heat supply network water 108 direct heating through third water pump 185. The dividing wall heat exchanger 109 can be eliminated if the boiler burner does not require humidity in the combustion gases. By the mode, heat energy in the flue gas is fully recovered, and occupied land is saved.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A flue gas waste heat recovery system is characterized by comprising a chimney and a waste heat extraction and utilization mechanism, wherein,
the chimney comprises a chimney base section, a water receiving disc, a chimney transition section, a water spraying disc, a chimney contraction section and a chimney smoke exhaust section which are sequentially arranged from bottom to top, wherein the chimney base section is connected with a boiler through a boiler flue, a water outlet is also formed in the chimney base section, the water outlet of the chimney base section and the water outlet of the water receiving disc are respectively communicated to an intermediate circulating water inlet of the waste heat extraction and utilization mechanism, and an intermediate circulating water outlet of the waste heat extraction and utilization mechanism is communicated to a water inlet of the water spraying disc; and,
the waste heat extracting and utilizing mechanism is provided with a combustion-supporting gas inlet and a combustion-supporting gas outlet, and the combustion-supporting gas outlet is communicated to the boiler.
2. The flue gas waste heat recovery system according to claim 1, wherein the waste heat extraction and utilization mechanism comprises a spray heat exchanger, the spray heat exchanger comprising a first combustion-supporting gas inlet, a first combustion-supporting gas outlet, a first water inlet, a first water outlet, a first water pump and a second water pump, wherein,
the first combustion-supporting gas inlet is communicated with air;
the first combustion-supporting gas outlet is communicated with the boiler;
the first water inlet is connected with the water pan through the first water pump; and
the first water outlet is connected with the water spraying disc through the second water pump.
3. The flue gas waste heat recovery system of claim 2, wherein the waste heat extraction and utilization mechanism further comprises a heat-screen heat exchanger comprising a second water inlet, a second water outlet, a heat-screen water inlet, a heat-screen water outlet, and a third water pump, wherein,
the second water inlet is connected with a water outlet at the bottom of the chimney foundation section through a third water pump; and
the second water outlet is connected with the water spraying disc.
4. The flue gas waste heat recovery system according to claim 3, wherein the waste heat extraction and utilization mechanism further comprises an oxidant gas drying device disposed between the spray heat exchanger and the boiler, the oxidant gas drying device comprises a second oxidant gas inlet, a second oxidant gas outlet, a third water inlet, a third water outlet, a first valve and a second valve,
the second combustion-supporting gas inlet is connected with the first combustion-supporting gas outlet;
the second combustion-supporting gas outlet is connected with a combustion-supporting gas inlet of the boiler;
the third water inlet is connected with the second water outlet through the first valve; and
the third water outlet is connected with the water spraying disc through the second valve.
5. The flue gas waste heat recovery system of claim 4, wherein the waste heat extraction and utilization mechanism further comprises a third valve, wherein the third valve is arranged in parallel with the combustion-supporting gas drying device.
6. The flue gas waste heat recovery system according to claim 1, wherein the water spray tray comprises a plurality of spray water pipes arranged at intervals, the plurality of spray water pipes are communicated with the water inlet pipe of the water spray tray, and a plurality of downward nozzles are uniformly arranged on the plurality of spray water pipes; or,
the water spraying disc comprises a water inlet pipe, a disc-shaped body, a plurality of strip-shaped smoke filtering holes which are distributed on the disc-shaped body in parallel at equal intervals, and a plurality of nozzles which are distributed at the bottom of the disc-shaped body uniformly.
7. The flue gas waste heat recovery system of claim 1, wherein the water receiving tray comprises a water receiving groove with a circular cross section and a through hole located in the center of the water receiving groove, the outer diameter of the water receiving groove is equal to the inner diameter of the transition section of the chimney, and the inner diameter of the water receiving groove is reduced along with the increase of the height of the water receiving groove.
8. The flue gas waste heat recovery system of claim 1, wherein the diameter of the chimney base section is D1The diameter of the transition section of the chimney is D2The diameter of the smoke exhaust section of the chimney is D3The diameter of the upper end surface of the chimney contraction section is D3And a lower end face diameter D2Wherein D is1＝D2>2D3。
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| CN201721222625.8U CN207729639U (en) | 2017-09-22 | 2017-09-22 | A kind of flue gas waste heat recovery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461760A (en) * | 2017-09-22 | 2017-12-12 | 北京华誉能源技术股份有限公司 | A kind of flue gas waste heat recovery system and method |
| CN117006458A (en) * | 2023-09-18 | 2023-11-07 | 承德市生态环境局鹰手营子矿区分局 | A thermal power plant boiler flue gas waste heat recovery and utilization system |
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2017
- 2017-09-22 CN CN201721222625.8U patent/CN207729639U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107461760A (en) * | 2017-09-22 | 2017-12-12 | 北京华誉能源技术股份有限公司 | A kind of flue gas waste heat recovery system and method |
| CN107461760B (en) * | 2017-09-22 | 2024-03-19 | 北京华誉能源技术股份有限公司 | Flue gas waste heat recovery system and method |
| CN117006458A (en) * | 2023-09-18 | 2023-11-07 | 承德市生态环境局鹰手营子矿区分局 | A thermal power plant boiler flue gas waste heat recovery and utilization system |
| CN117006458B (en) * | 2023-09-18 | 2024-05-14 | 辽阳县宏达热电有限公司 | Boiler flue gas waste heat recovery utilizes system of thermal power plant |
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