CN216644217U - Waste incineration waste heat utilization device for recycling heat of flue gas furnace slag - Google Patents
Waste incineration waste heat utilization device for recycling heat of flue gas furnace slag Download PDFInfo
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- CN216644217U CN216644217U CN202123087473.4U CN202123087473U CN216644217U CN 216644217 U CN216644217 U CN 216644217U CN 202123087473 U CN202123087473 U CN 202123087473U CN 216644217 U CN216644217 U CN 216644217U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
Abstract
The utility model discloses a waste incineration waste heat utilization device for recovering heat of flue gas and slag, which comprises a waste incinerator, a slag waste heat boiler, a first steam turbine, a third steam turbine, a flue gas waste heat boiler, a first condenser, a first heat exchanger and a third heat exchanger, wherein the slag waste heat boiler is arranged in the waste incinerator; the output power and the energy utilization efficiency of the waste incineration power plant are improved through the step recovery of the heat of the flue gas and the slag and the matching and coupling of the heat of different grades; the waste heat boiler is used for recovering the heat of the slag to carry out steam Rankine cycle power generation, so that the cooling water consumption in the conventional slag treatment process is greatly reduced; the heat of the exhaust steam and the low-temperature flue gas of the steam turbine is recovered through the return water of the heat supply network, so that the heat supply amount and the heat supply income of the power plant are increased, and the economic benefit of the power plant is improved.
Description
Technical Field
The utility model belongs to the technical field of energy utilization, and particularly relates to a waste incineration waste heat utilization device for recovering heat of flue gas and slag.
Background
Landfill is the main mode of treating garbage, and has the advantages of simple operation, low cost and large occupied area, and landfill leachate generated in the landfill process is difficult to treat in the long term, so that the land and underground water resources in the area are polluted, and the pressure of landfill is increasingly greater along with the promotion of urbanization. The garbage incineration power generation is to release chemical energy stored in household garbage through incineration, convert the chemical energy into heat energy and utilize the heat energy. Compared with landfill, the emission of pollution gas generated by garbage incineration is much lower, and meanwhile, the generated electric power and heat supply can reduce the consumption of non-renewable energy sources, so that energy conservation and emission reduction are realized, and the method is gradually becoming the mainstream for treating urban domestic garbage in China at present.
Although incineration has obvious advantages in harmless treatment of municipal domestic waste, some key problems to be solved exist, the most extensive problems are that the overall energy efficiency of a waste incineration power plant is low, and large low-grade energy loss exists, and the main reasons are heat loss of boiler combustion and low-temperature heat loss of tail gas exhaust smoke. In addition, the bottom ash particles at the bottom of the incinerator of the waste incineration power plant also contain larger waste heat energy, but the current waste incineration power plant rarely utilizes the waste heat energy. Waste heat recovery needs to consider the energy product demand of a region, because waste heat resources can be used for not only power generation, but also regional heat supply, domestic hot water supply and cold energy supply through a refrigeration technology.
In the prior art, the heat in the slag at the bottom of the incinerator of the waste incineration power plant is not utilized, but only the waste heat in the flue gas is utilized.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a waste incineration waste heat utilization device for recovering heat of flue gas and slag, which aims to realize the aim of double recovery of the heat of the flue gas and the slag.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a waste incineration waste heat utilization device for recovering heat of flue gas and slag comprises a waste incinerator, a slag waste heat boiler, a first steam turbine, a third steam turbine, a flue gas waste heat boiler, a first condenser, a first heat exchanger and a third heat exchanger;
a high-temperature flue gas outlet at the top of the garbage incinerator is connected to the flue gas waste heat boiler, a steam outlet of the flue gas waste heat boiler is connected to a steam inlet of the third steam turbine, a dead steam outlet of the third steam turbine is connected to an inlet of the first condenser, and a water outlet of the first condenser is connected to a water inlet of the flue gas waste heat boiler;
the bottom high-temperature slag outlet of the garbage incinerator is connected with the feed inlet of the slag waste heat boiler, the superheated steam outlet of the slag waste heat boiler is connected to the first steam turbine, the dead steam outlet of the first steam turbine is connected to the steam heat exchange inlet of the first heat exchanger, the steam heat exchange outlet of the first heat exchanger is connected to the steam heat exchange inlet of the third heat exchanger, and the outlet of the third heat exchanger is connected to the circulating water inlet of the slag waste heat boiler.
Optionally, the system further comprises a second turbine, a second heat exchanger and a second condenser;
the organic working medium heat exchange outlet of the first heat exchanger is connected with the organic working medium heat exchange inlet of the second heat exchanger, the organic working medium heat exchange outlet of the second heat exchanger is connected to the second steam turbine, the exhaust steam outlet of the second steam turbine is connected with the inlet of the second condenser, and the condensation outlet of the second condenser is connected with the organic working medium heat exchange inlet of the first heat exchanger through an organic working medium circulating pipeline.
Optionally, the heat supply system further comprises a heat supply network water return pipeline and a fourth heat exchanger, wherein the heat supply network water return pipeline is sequentially connected with the third heat exchanger and the fourth heat exchanger.
Optionally, a flue gas outlet of the flue gas waste heat boiler is connected with a flue gas heat exchange inlet of the second heat exchanger.
Optionally, the flue gas heat exchange outlet of the second heat exchanger is connected to the flue gas heat exchange inlet of the fourth heat exchanger.
Optionally, the feed inlet of the garbage incinerator is connected with a domestic garbage conveying device.
Optionally, the feeding port of the garbage incinerator is connected with an air conveying device.
Optionally, a solid particle discharge port is arranged at the bottom of the slag waste heat boiler.
The utility model has the following beneficial effects:
the waste incineration waste heat utilization device provided by the embodiment of the utility model comprises a waste incinerator, a slag waste heat boiler, a first steam turbine, a third steam turbine, a flue gas waste heat boiler, a first condenser, a first heat exchanger, a second heat exchanger, a third heat exchanger and a fourth heat exchanger; the output power and the energy utilization efficiency of the waste incineration power plant are improved through the step recovery of the heat of the flue gas and the slag and the matching and coupling of the heat of different grades; the waste heat boiler is used for recovering the heat of the slag to carry out steam Rankine cycle power generation, so that the cooling water consumption in the conventional slag treatment process is greatly reduced; the heat of the exhaust steam and the low-temperature flue gas of the steam turbine is recovered through the return water of the heat supply network, so that the heat supply amount and the heat supply income of the power plant are increased, and the economic benefit of the power plant is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a block diagram of a waste incineration waste heat utilization device according to an embodiment of the present invention;
fig. 2 is a block diagram of a waste incineration waste heat utilization device according to a preferred embodiment of the present invention;
fig. 3 is a block diagram of a waste incineration waste heat utilization device according to another preferred embodiment of the present invention;
wherein: 1, a garbage incinerator; 2, a slag waste heat boiler; 3 a first turbine; 4 a second turbine; 5 a third turbine; 6, a flue gas waste heat boiler; 7 a first condenser; 8, a first heat exchanger; 9 a second heat exchanger; 10 a third heat exchanger; 11 a fourth heat exchanger; 12 a second condenser; 13 a domestic garbage conveying device; 14 an air delivery device; 15 high-temperature flue gas outlet; 16 high-temperature slag outlet; 17 a heat supply network water return pipeline; 18 circulating water inlet; 19 a superheated steam outlet; and 20, circulating an organic working medium pipeline.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.
The following detailed description is exemplary in nature and is intended to provide further details of the utility model. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a waste incineration waste heat utilization apparatus for recovering heat from flue gas and slag, including a waste incinerator 1, a slag waste heat boiler 2, a first turbine 3, a third turbine 5, a flue gas waste heat boiler 6, a first condenser 7, a first heat exchanger 8, and a third heat exchanger 10;
a top high-temperature flue gas outlet 15 of the garbage incinerator 1 is connected to the flue gas waste heat boiler 6, a steam outlet of the flue gas waste heat boiler 6 is connected to a steam inlet of the third steam turbine 5, a steam exhaust outlet of the third steam turbine 5 is connected to an inlet of the first condenser 7, and a water outlet of the first condenser 7 is connected to a water inlet of the flue gas waste heat boiler 6; the bottom high-temperature slag outlet of the garbage incinerator 1 is connected with the feed inlet of the slag waste heat boiler 2, the superheated steam outlet 19 of the slag waste heat boiler 2 is connected to the first steam turbine 3, the exhaust steam outlet of the first steam turbine 3 is connected to the steam heat exchange inlet of the first heat exchanger 8, the steam heat exchange outlet of the first heat exchanger 8 is connected to the steam heat exchange inlet of the third heat exchanger 10, and the outlet of the third heat exchanger 10 is connected to the circulating water inlet 18 of the slag waste heat boiler 2.
The feed inlet of the garbage incinerator 1 is connected with a household garbage conveying device 13, the feed inlet of the garbage incinerator 1 is connected with an air conveying device 14, and the bottom of the slag waste heat boiler 2 is provided with a solid particle discharge port.
Through the arrangement, the step recovery of the heat of the flue gas and the slag is matched and coupled with the heat of different grades, so that the output power and the energy utilization efficiency of the waste incineration power plant are improved; the waste heat boiler is used for recovering the heat of the slag to carry out steam Rankine cycle power generation, so that the cooling water consumption in the conventional treatment process of the slag is greatly reduced.
Example 2
As shown in fig. 2, as a preferred embodiment of the present invention, on the basis of embodiment 1, the present invention further includes a second turbine 4, a second heat exchanger 9 and a second condenser 12;
the organic working medium heat exchange outlet of the first heat exchanger 8 is connected with the organic working medium heat exchange inlet of the second heat exchanger 9, the organic working medium heat exchange outlet of the second heat exchanger 9 is connected to the second steam turbine 4, the exhaust steam outlet of the second steam turbine 4 is connected with the inlet of the second condenser 12, and the condensation outlet of the second condenser 12 is connected with the organic working medium heat exchange inlet of the first heat exchanger 8 through the organic working medium pipeline 20. And a flue gas outlet of the flue gas waste heat boiler 6 is connected with a flue gas heat exchange inlet of the second heat exchanger 9.
Example 3
As shown in fig. 3, as a preferred embodiment of the present invention, in addition to embodiment 2, the present invention further includes a heat supply network return pipeline 17 and a fourth heat exchanger 11, where the heat supply network return pipeline 17 is sequentially connected to the third heat exchanger 10 and the fourth heat exchanger 11. And a flue gas heat exchange outlet of the second heat exchanger 9 is connected with a flue gas heat exchange inlet of the fourth heat exchanger 11.
The heat of the exhaust steam and the low-temperature flue gas of the steam turbine is recovered through the return water of the heat supply network, so that the heat supply amount and the heat supply income of the power plant are increased, and the economic benefit of the power plant is improved. Through the heat exchange between the exhaust steam of the steam turbine in the steam Rankine cycle and the return water of the heat supply network, the exhaust steam is cooled and condensed into water, and a condenser is not required to be arranged.
the household garbage enters a garbage incinerator 1 and is incinerated under the combustion supporting of air to generate high-temperature slag and high-temperature flue gas; the high-temperature slag enters the slag waste heat boiler 2 to exchange heat with circulating water, and cooled solid particles are discharged; the circulating water receives heat of the slag to form superheated steam, the superheated steam is sent to the first steam turbine 3 to do work for power generation, the steam after doing work enters the first heat exchanger 8 to exchange heat with the circulating organic working medium, then enters the third heat exchanger 10 to continuously exchange heat with return water of a heat supply network, is condensed into water, and continuously returns to the slag waste heat boiler 2 to complete steam Rankine cycle; the circulating organic working medium exchanges heat with steam in the first heat exchanger 8, enters the second heat exchanger 9, exchanges heat with the cooled flue gas and is evaporated into steam, then enters the second steam turbine 4 to do work and generate power, and the worked organic working medium steam is condensed into liquid through the second condenser 12 to complete organic Rankine cycle; the high-temperature flue gas discharged by the garbage incinerator 1 enters a flue gas waste heat boiler 6, exchanges heat with circulating water to be cooled, enters a second heat exchanger 9 to exchange heat with organic working media, enters a fourth heat exchanger 11 to exchange heat with return water of a heat supply network to be cooled, and is sent to a purification device. Steam generated in the flue gas waste heat boiler 6 enters a third steam turbine 5 to do work to generate power, and exhaust steam enters a first condenser 7 to be condensed into water and then returns to the flue gas waste heat boiler 6 to complete circulation; the return water 17 of the heat supply network returns to the heat supply network after being heated by the third heat exchanger 10 and the fourth heat exchanger 11.
According to the utility model, the heat in the slag and the flue gas at the bottom of the incinerator of the waste incineration power plant is simultaneously recycled through multi-stage heat recovery, and power generation is carried out through a steam Rankine cycle and an organic Rankine cycle, so that the output power of the waste incineration power plant is improved. Meanwhile, the low-level heat of the exhaust steam and the flue gas of the steam turbine in the steam Rankine cycle is fully recovered by utilizing the return water of the heat supply network, and the return water of the heat supply network is sent back to the heat supply network after being heated, so that the heat supply capacity of a power plant can be increased.
The output power and the energy utilization efficiency of the waste incineration power plant are improved through the step recovery of the heat of the flue gas and the slag and the matching and coupling of the heat of different grades; the waste heat boiler is used for recovering the heat of the slag to carry out steam Rankine cycle power generation, so that the cooling water consumption in the conventional slag treatment process is greatly reduced; the heat of the exhaust steam and the low-temperature flue gas of the steam turbine is recovered through the return water of the heat supply network, so that the heat supply amount and the heat supply income of the power plant are increased, and the economic benefit of the power plant is improved.
It will be appreciated by those skilled in the art that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or are equivalent to the scope of the utility model are intended to be embraced therein.
Claims (8)
1. A waste incineration waste heat utilization device for recycling heat of flue gas and slag is characterized by comprising a waste incinerator (1), a slag waste heat boiler (2), a first steam turbine (3), a third steam turbine (5), a flue gas waste heat boiler (6), a first condenser (7), a first heat exchanger (8) and a third heat exchanger (10);
a top high-temperature flue gas outlet (15) of the garbage incinerator (1) is connected to the flue gas waste heat boiler (6), a steam outlet of the flue gas waste heat boiler (6) is connected to a steam inlet of the third steam turbine (5), a steam exhaust outlet of the third steam turbine (5) is connected to an inlet of the first condenser (7), and a water outlet of the first condenser (7) is connected to a water inlet of the flue gas waste heat boiler (6);
the bottom high-temperature slag outlet of the garbage incinerator (1) is connected with the feed inlet of the slag waste heat boiler (2), the superheated steam outlet (19) of the slag waste heat boiler (2) is connected to the first steam turbine (3), the exhaust steam outlet of the first steam turbine (3) is connected to the steam heat exchange inlet of the first heat exchanger (8), the steam heat exchange outlet of the first heat exchanger (8) is connected to the steam heat exchange inlet of the third heat exchanger (10), and the outlet of the third heat exchanger (10) is connected with the circulating water inlet (18) of the slag waste heat boiler (2).
2. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 1, further comprising a second turbine (4), a second heat exchanger (9) and a second condenser (12);
the organic working medium heat exchange outlet of the first heat exchanger (8) is connected with the organic working medium heat exchange inlet of the second heat exchanger (9), the organic working medium heat exchange outlet of the second heat exchanger (9) is connected to the second steam turbine (4), the exhaust steam outlet of the second steam turbine (4) is connected with the inlet of the second condenser (12), and the condensation outlet of the second condenser (12) is connected with the organic working medium heat exchange inlet of the first heat exchanger (8) through the organic working medium circulation pipeline (20).
3. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 2, characterized in that a flue gas outlet of the flue gas waste heat boiler (6) is connected with a flue gas heat exchange inlet of the second heat exchanger (9).
4. The waste incineration waste heat utilization device for recycling heat of flue gas slag according to claim 3, further comprising a heat supply network water return pipeline (17) and a fourth heat exchanger (11), wherein the heat supply network water return pipeline (17) is sequentially connected with the third heat exchanger (10) and the fourth heat exchanger (11).
5. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 4, characterized in that the flue gas heat exchange outlet of the second heat exchanger (9) is connected with the flue gas heat exchange inlet of the fourth heat exchanger (11).
6. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 1, characterized in that a domestic waste conveying device (13) is connected to a feed inlet of the waste incinerator (1).
7. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 1, characterized in that an air conveying device (14) is connected to a feed inlet of the waste incinerator (1).
8. The waste incineration waste heat utilization device for flue gas slag heat recovery according to claim 1, characterized in that a solid particle discharge port is arranged at the bottom of the slag waste heat boiler (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123087473.4U CN216644217U (en) | 2021-12-09 | 2021-12-09 | Waste incineration waste heat utilization device for recycling heat of flue gas furnace slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123087473.4U CN216644217U (en) | 2021-12-09 | 2021-12-09 | Waste incineration waste heat utilization device for recycling heat of flue gas furnace slag |
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| CN216644217U true CN216644217U (en) | 2022-05-31 |
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| CN202123087473.4U Active CN216644217U (en) | 2021-12-09 | 2021-12-09 | Waste incineration waste heat utilization device for recycling heat of flue gas furnace slag |
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- 2021-12-09 CN CN202123087473.4U patent/CN216644217U/en active Active
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