CN209944382U - Coal-fired boiler flue gas waste heat deep utilization system with desulfurizing tower - Google Patents
Coal-fired boiler flue gas waste heat deep utilization system with desulfurizing tower Download PDFInfo
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- CN209944382U CN209944382U CN201920436488.0U CN201920436488U CN209944382U CN 209944382 U CN209944382 U CN 209944382U CN 201920436488 U CN201920436488 U CN 201920436488U CN 209944382 U CN209944382 U CN 209944382U
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Abstract
A coal-fired boiler flue gas waste heat deep utilization system with a desulfurizing tower is additionally provided with a desulfurizing slurry heat extractor (8), a desulfurizing slurry circulating pipeline (9) is arranged between the desulfurizing slurry heat extractor (8) and the desulfurizing tower (2), a sprayer is arranged in the desulfurizing tower (2), high-temperature slurry at the bottom of the desulfurizing tower (2) is cooled after being heated by the desulfurizing slurry heat extractor (8) and waste heat water, low-temperature slurry enters the desulfurizing tower (2) for spraying, and the slurry returns to the bottom of the desulfurizing tower after being heated; a waste heat water circulation pipeline (4) is arranged between the desulfurization slurry heat collector (8) and the heat pump unit (6), waste heat water is heated by the desulfurization slurry heat collector (8) and then enters the heat pump unit (6), and low-temperature waste heat of the waste heat water is recovered by the heat pump unit (6) to heat return water of a heat supply network. The utility model discloses an above-mentioned flow, degree of depth recycle flue gas waste heat is retrieved the heat supply heating network aquatic with flue gas waste heat, improves boiler efficiency, retrieves the flue gas comdenstion water, alleviates white plume and forms, realizes energy-conservation, water conservation and environmental protection.
Description
Technical Field
The utility model relates to a heating ventilation air conditioning technology field especially relates to a coal fired boiler flue gas waste heat degree of depth utilization system of taking desulfurizing tower.
Background
At present, flue gas generated by a coal-fired boiler passes through a desulfurizing tower and then enters a chimney to be discharged, the temperature of the flue gas is 50 ~ 60 ℃, the flue gas contains a large amount of latent heat of water vapor, the latent heat of the water vapor accounts for about 7 percent of the calorific value of fuel, energy waste is caused, and a 'white smoke' phenomenon can be formed.
The northern coal-fired boiler is used as a heat source for central heating to heat the return water of a heat supply network, the return water of the heat supply network is generally 50 ~ 60 ℃, and the heat of flue gas cannot be directly recovered.
The existing flue gas waste heat utilization scheme is that a special spray tower or a flue gas heat exchanger is additionally arranged behind a flue gas outlet of a desulfurizing tower to obtain low-temperature waste heat, and then the absorption heat pump technology is adopted to recover the low-temperature waste heat to a heat supply network. The low-temperature waste heat taking system is complex, the resistance of a flue gas system is increased, and the investment is high.
The chinese utility model with publication number CN207455616U discloses a coal-fired boiler flue gas waste heat recycling system, which comprises a boiler body, a flue gas channel and a chimney which are connected in sequence, wherein a first heat exchanger, a second heat exchanger, a desulfurizing tower, a dust remover and a flue gas reheater are arranged in the flue gas channel in sequence; the device comprises a first heat exchanger, a second heat exchanger, a flue gas reheater, a heat-carrying circulating pump, a spray pipe, a high-temperature flue gas nozzle, a flue gas channel, a desulfurization liquid pool, a first heat exchanger, a spray pipe, a second heat exchanger, a flue gas reheater and a heat-carrying circulating pump. The system can reduce the acid dew point temperature of the desulfurized flue gas, thereby reducing or canceling the energy consumption required for improving the temperature of the desulfurized flue gas, and reducing the cost for treating the desulfurized wastewater.
The coal-fired boiler flue gas waste heat recovery system stated in this patent relates to above-mentioned problem equally, it has set up first heat exchanger and second heat exchanger, still add the evaporation tower specially to be provided with shower, high temperature flue gas nozzle etc. in the evaporation tower and obtain low temperature waste heat, therefore this system constitutes complicacy, the cost is higher.
Therefore, how to find a simpler flue gas low-temperature waste heat extraction system to realize deep utilization of flue gas waste heat of the coal-fired boiler becomes one of the important topics of current research.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem of proposing among the above-mentioned background problem, provide a take coal fired boiler flue gas waste heat degree of depth utilization system of desulfurizing tower, it can degree of depth recycle flue gas waste heat, with flue gas waste heat recovery heat supply network aquatic, improve boiler efficiency 7-10%, retrieve the flue gas comdenstion water simultaneously, alleviate white rain and form, realize economic and social of energy-conservation, water conservation and environmental protection.
The purpose of the utility model is realized like this: the deep utilization system for the flue gas waste heat of the coal-fired boiler with the desulfurizing tower comprises a coal-fired boiler body, the desulfurizing tower, a heat pump unit and a heat supply network, wherein a desulfurizing slurry heat collector is additionally arranged in the system and is arranged between the desulfurizing tower and the heat pump unit;
a desulfurization slurry circulating pipeline is arranged between the desulfurization slurry heat extractor and the desulfurization tower, a sprayer is arranged in the desulfurization tower, high-temperature slurry at the bottom of the desulfurization tower is cooled after the desulfurization slurry heat extractor heats waste hot water, low-temperature slurry enters the desulfurization tower for spraying, and the slurry returns to the bottom of the desulfurization tower after being heated;
the desulfurization slurry heat collector and the heat pump unit are provided with residual heat water circulation pipelines, residual heat water is heated by the desulfurization slurry heat collector and then enters the heat pump unit, and low-temperature residual heat of the residual heat water recovered by the heat pump unit heats return water of a heat supply network.
And a heat pump heat supply network water circulation pipeline is arranged among the heat supply network, the heat pump unit and the coal-fired boiler, and the return water of the heat supply network enters the heat pump unit to be heated and then enters the coal-fired boiler to be heated for the second time and finally flows out as the supply water of the heat supply network.
The heat pump unit is a hot water, steam and gas driven lithium bromide absorption heat pump unit or an electric heat pump unit driven by electric power.
And a driving heat source circulating pipeline is also arranged on one side of the heat pump unit.
And the top of the desulfurizing tower is also provided with a smoke outlet.
The system is also additionally provided with a steam-water heat exchanger at one side of the water circulation pipeline of the heat pump heat supply network.
Compared with the prior art, the utility model has the advantages of it is following:
1. compared with the prior art, the structure is reasonable and simple, the installation is convenient, and the cost is reduced.
2. By utilizing the heat pump technology, the low-temperature waste heat of the flue gas is recycled into the water of the heat supply network, the boiler efficiency is improved by 7-10%, and the operation cost is reduced.
3. The smoke condensate water is recycled, the formation of white smoke plume is relieved, and economic and social benefits of energy conservation, water conservation and environmental protection are realized.
Drawings
FIG. 1 is a schematic view showing the principle of a conventional coal-fired hot water boiler according to the prior art.
Fig. 2 is a schematic structural view of a flue gas waste heat recovery system of a coal-fired hot water boiler in the prior art, wherein:
3. a flue gas heat exchanger.
FIG. 3 is the utility model discloses a take coal fired boiler flue gas waste heat degree of depth utilization system's of desulfurizing tower structural schematic diagram, wherein:
1. a coal-fired boiler; 2. a desulfurizing tower; 4. a residual heat water circulation pipeline; 5. a driving heat source circulation line; 6. a heat pump unit; 7. a heat pump heat supply network water circulation pipeline; 8. a desulfurized slurry heat extractor; 9. a desulfurization slurry circulation pipeline; 11. returning water to the heat supply network; 12. and supplying water to the heat supply network.
Fig. 4 is another embodiment of the deep flue gas waste heat utilization system of a coal-fired boiler with a desulfurizing tower of the present invention.
Fig. 5 is another embodiment of the deep flue gas waste heat utilization system of a coal-fired boiler with a desulfurizing tower of the present invention, wherein:
10. a steam-water heat exchanger; 13. a steam inlet; 14. and a steam condensate outlet.
Detailed Description
The invention is described below with reference to the accompanying drawings and specific embodiments:
as shown in fig. 3, a coal-fired boiler flue gas waste heat deep utilization system with a desulfurizing tower comprises a coal-fired boiler 1 body, a desulfurizing tower 2, a heat pump unit 6 and a heat supply network, wherein a desulfurizing slurry heat extractor 8 is additionally arranged in the system, and the desulfurizing slurry heat extractor 8 is arranged between the desulfurizing tower 2 and the heat pump unit 6;
a desulfurization slurry circulating pipeline 9 is arranged between the desulfurization slurry heat extractor 8 and the desulfurization tower 2, a sprayer is arranged in the desulfurization tower 2, high-temperature slurry at the bottom of the desulfurization tower 2 is cooled after being heated by waste heat water of the desulfurization slurry heat extractor 8, low-temperature slurry enters the desulfurization tower 2 for spraying, and the slurry returns to the bottom of the desulfurization tower after being heated;
the desulfurization slurry heat collector 8 and the heat pump unit 6 are provided with a residual heat water circulation pipeline 4, residual heat water is heated by the desulfurization slurry heat collector 8 and then enters the heat pump unit 6, and low-temperature residual heat of the residual heat water recovered by the heat pump unit 6 heats return water of a heat supply network.
And a heat pump heat supply network water circulation pipeline 7 is arranged among the heat supply network, the heat pump unit 6 and the coal-fired boiler 1, and the return water of the heat supply network enters the heat pump unit 6 to be heated and then enters the coal-fired boiler 1 to be heated for the second time and finally flows out as the supply water of the heat supply network.
The heat pump unit 6 is a hot water, steam, gas driven lithium bromide absorption heat pump unit, or an electrically driven electric heat pump unit.
And a driving heat source circulating pipeline 5 is also arranged on one side of the heat pump unit 6.
And the top of the desulfurizing tower 2 is also provided with a smoke outlet.
In the embodiment, the coal-fired boiler 1 is a coal-fired hot water boiler, and the heat pump unit 6 drives a heat source to supply water to a heat supply network. The advanced heat pump heat supply network water circulation pipeline 7 of heat supply network return water heats up and then advances boiler 1 and heaies up for the heat supply network supplies water, and the cooling becomes low temperature thick liquid after the high temperature thick liquid in desulfurizing tower 2 bottom heats waste heat water through desulfurizing slurry heat exchanger 8, and low temperature thick liquid gets into desulfurizing tower 8 and sprays, realizes flue gas temperature reduction and flue gas normal water vapor condensation in the desulfurization simultaneously, and the thick liquid gets back to the desulfurizing tower 8 bottom after heating up, realizes flue gas desulfurization and gets heat. The heat pump unit 6 is connected with the desulfurization slurry heat collector 8 through a residual heat water circulation pipeline, the residual heat water is heated and heated by the desulfurization slurry heat collector 8 and then enters the heat pump unit 6 to release heat and cool, a heat supply network is heated and returns water, and the cooled residual heat water returns to the desulfurization slurry heat collector 8 to circulate. The low-temperature waste heat of the flue gas is recycled into the water of the heat supply network, the coal burning efficiency can be improved, the operation cost is reduced, and the formation of white smoke plume is reduced.
As shown in fig. 4, in another embodiment, the heat pump unit 6 may be another lithium bromide absorption heat pump unit driven by hot water, steam, fuel gas, or the like, or may be an electric heat pump unit driven by electric power.
As shown in fig. 5, in another embodiment, the system of the present invention is further provided with a steam-water heat exchanger 10, and after the temperature of the heat supply network backwater advanced heat pump heat supply network water circulation system 7 is raised, the heat supply network backwater advanced heat pump heat supply network water circulation system directly enters the steam-water heat exchanger 10 to be heated for the second time, so as to become the heat supply network water supply. The coal-fired boiler can be a hot water boiler or a steam boiler.
The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a take coal fired boiler flue gas waste heat degree of depth utilization system of desulfurizing tower, it includes coal fired boiler (1) body, desulfurizing tower (2), heat pump set (6) and heat supply network, its characterized in that: the system is also provided with a desulfurization slurry heat extractor (8), and the desulfurization slurry heat extractor (8) is arranged between the desulfurization tower (2) and the heat pump unit (6);
a desulfurization slurry circulating pipeline (9) is arranged between the desulfurization slurry heat extractor (8) and the desulfurization tower (2), and a sprayer is arranged in the desulfurization tower (2);
and the desulfurization slurry heat collector (8) and the heat pump unit (6) are provided with a waste heat water circulation pipeline (4).
2. The coal-fired boiler flue gas waste heat deep utilization system with the desulfurizing tower of claim 1, characterized in that: and a heat pump heat supply network water circulation pipeline (7) is arranged among the heat supply network, the heat pump unit (6) and the coal-fired boiler (1).
3. The coal-fired boiler flue gas waste heat deep utilization system with the desulfurizing tower of claim 1, characterized in that: the heat pump unit (6) is a hot water, steam and gas driven lithium bromide absorption heat pump unit or an electric heat pump unit driven by electric power.
4. The coal-fired boiler flue gas waste heat deep utilization system with the desulfurizing tower of claim 3, characterized in that: and a driving heat source circulating pipeline (5) is also arranged on one side of the heat pump unit (6).
5. The coal-fired boiler flue gas waste heat deep utilization system with the desulfurizing tower of claim 1, characterized in that: and the top of the desulfurizing tower (2) is also provided with a smoke outlet.
6. The coal-fired boiler flue gas waste heat deep utilization system with the desulfurizing tower of claim 2, characterized in that: a steam-water heat exchanger (10) is additionally arranged on one side of a water circulation pipeline (7) of the heat pump heat supply network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920436488.0U CN209944382U (en) | 2019-04-02 | 2019-04-02 | Coal-fired boiler flue gas waste heat deep utilization system with desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920436488.0U CN209944382U (en) | 2019-04-02 | 2019-04-02 | Coal-fired boiler flue gas waste heat deep utilization system with desulfurizing tower |
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| Publication Number | Publication Date |
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| CN209944382U true CN209944382U (en) | 2020-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920436488.0U Active CN209944382U (en) | 2019-04-02 | 2019-04-02 | Coal-fired boiler flue gas waste heat deep utilization system with desulfurizing tower |
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| CN (1) | CN209944382U (en) |
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2019
- 2019-04-02 CN CN201920436488.0U patent/CN209944382U/en active Active
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