CN212430917U - Waste incineration power station waste heat comprehensive utilization system - Google Patents
Waste incineration power station waste heat comprehensive utilization system Download PDFInfo
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- CN212430917U CN212430917U CN202021034462.2U CN202021034462U CN212430917U CN 212430917 U CN212430917 U CN 212430917U CN 202021034462 U CN202021034462 U CN 202021034462U CN 212430917 U CN212430917 U CN 212430917U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model discloses a waste heat comprehensive utilization system of a waste incineration power station, which comprises a waste heat boiler, a primary flue gas heat exchanger, a semi-dry reaction tower, a bag-type dust collector, a flue gas reheater, a steam-flue gas preheater, an SCR denitration system, a secondary flue gas heat exchanger and a chimney which are connected in sequence; the primary flue gas heat exchanger, the flue gas reheater and the secondary flue gas heat exchanger are all provided with a flue gas inlet, a flue gas outlet, a water inlet and a water outlet; the water inlet of the flue gas reheater is connected with a water supplementing device, the water outlet of the flue gas reheater is respectively connected with the water inlet of the first-stage flue gas heat exchanger and the water inlet of the second-stage flue gas heat exchanger through pipelines, and the water outlet of the first-stage flue gas heat exchanger and the water outlet of the second-stage flue gas heat exchanger are respectively connected with the water inlet of the flue gas reheater through pipelines. This system can realize the recycle to the energy, and it not only can guarantee to get into the temperature of SCR deNOx systems's entry flue gas, can reduce the steam quantity moreover, improves the waste incineration power plant thermal efficiency.
Description
Technical Field
The utility model relates to a msw incineration power generation technical field, in particular to waste incineration power plant waste heat comprehensive utilization system.
Background
In recent years, urban domestic waste incineration power plants which are newly put into operation in China keep a high growth situation, however, a large amount of pollutants such as nitrogen oxides, acid gases, heavy metals, dioxin and the like are generated in the incineration treatment process of waste, so that the flue gas generated by the incineration of the waste needs to be treated by a flue gas purification system and is discharged after reaching the standard. At present, in a garbage power plant, when an SCR denitration system is additionally arranged at an outlet of a bag-type dust collector, most of the power plants are firstly provided with a GGH (flue gas-flue gas heat exchanger) and an SGH (steam-flue gas heat exchanger). However, after the GGH is operated for a period of time, phenomena such as heat exchange surface abrasion and corrosion can occur, so that partial flue gas short circuit phenomenon exists, and flue gas at the outlet of the bag-type dust collector directly enters a chimney, so that the pollutant index is higher.
SUMMERY OF THE UTILITY MODEL
For solving the technical problem, an object of the utility model is to provide a waste incineration power plant waste heat integrated utilization system, can utilize exhaust-heat boiler's export flue gas waste heat and SCR deNOx systems's export flue gas waste heat to the export flue gas of sack cleaner, not only can guarantee that the temperature that gets into SCR deNOx systems's entry flue gas reaches normal operating temperature, but also can reduce steam-flue gas pre-heater's steam quantity, realize the recycle of energy, improve waste incineration power plant thermal efficiency and reduce energy waste.
For realizing above-mentioned technical purpose, reach above-mentioned technological effect, the utility model discloses a following technical scheme realizes:
a waste heat comprehensive utilization system of a waste incineration power station comprises a waste heat boiler, a primary flue gas heat exchanger, a semi-dry reaction tower, a bag-type dust collector, a flue gas reheater, a steam-flue gas preheater, an SCR denitration system, a secondary flue gas heat exchanger and a chimney; the primary flue gas heat exchanger, the flue gas reheater and the secondary flue gas heat exchanger are all provided with a flue gas inlet, a flue gas outlet, a water inlet and a water outlet, the waste heat boiler, the primary flue gas heat exchanger, the semi-dry reaction tower, the bag-type dust collector, the flue gas reheater, the steam-flue gas preheater, the SCR denitration system, the secondary flue gas heat exchanger and the chimney are sequentially connected, so that outlet flue gas of the waste heat boiler sequentially enters the chimney through the primary flue gas heat exchanger, the semi-dry reaction tower, the bag-type dust collector, the flue gas reheater, the steam-flue gas preheater, the SCR denitration system; the water inlet of the flue gas reheater is connected with a water supplementing device, the water outlet of the flue gas reheater is respectively connected with the water inlet of the first-stage flue gas heat exchanger and the water inlet of the second-stage flue gas heat exchanger through pipelines, and the water outlet of the first-stage flue gas heat exchanger and the water outlet of the second-stage flue gas heat exchanger are respectively connected with the water inlet of the flue gas reheater through pipelines.
Furthermore, the system also comprises a first flue gas bypass, a second flue gas bypass and a third flue gas bypass; the first flue gas bypass is connected between the waste heat boiler and the semi-dry type reaction tower and is arranged in parallel with the primary flue gas heat exchanger; the second flue gas bypass is connected between the bag-type dust collector and the steam-flue gas preheater and is arranged in parallel with the flue gas reheater; the third flue gas bypass is connected between the SCR denitration system and the chimney and is arranged in parallel with the second-stage flue gas preheater.
Furthermore, the first flue gas bypass, the second flue gas bypass and the third flue gas bypass are respectively provided with a flue gas control valve.
Furthermore, water path control valves are arranged on a pipeline between a water outlet of the flue gas reheater and a water inlet of the primary flue gas heat exchanger, a pipeline between a water outlet of the flue gas reheater and a water inlet of the secondary flue gas heat exchanger, a pipeline between a water inlet of the flue gas reheater and a water outlet of the primary flue gas heat exchanger, and a pipeline between a water inlet of the flue gas reheater and a water outlet of the secondary flue gas heat exchanger.
Furthermore, the heat exchange surfaces of the primary flue gas heat exchanger, the secondary flue gas heat exchanger and the flue gas reheater are made of ND steel.
Furthermore, the primary flue gas heat exchanger, the secondary flue gas heat exchanger and the flue gas reheater are all provided with steam soot blowers.
The utility model has the advantages that: the system can heat the outlet flue gas of the bag-type dust collector by utilizing the outlet flue gas waste heat of the waste heat boiler and the outlet flue gas waste heat of the SCR denitration system, so that the inlet flue gas entering the SCR denitration system can reach normal working temperature, and the steam consumption of the steam-flue gas preheater can be reduced; the utility model discloses a system has realized the recycle of the energy to exhaust-heat boiler's export flue gas waste heat and SCR deNOx systems's export flue gas waste heat, has improved the waste incineration power plant thermal efficiency and has reduced the energy waste. Furthermore, the utility model discloses utilize one-level gas heater, second grade gas heater and flue gas reheater to replace the flue gas-gas heater who uses among the prior art to prevent the production of the flue gas short circuit phenomenon that leads to because of the heat transfer surface wearing and tearing of flue gas-gas heater corrodes, thereby guarantee the effective control of pollutant emission index.
Drawings
Fig. 1 is the structure schematic diagram of the waste heat comprehensive utilization system of the waste incineration power station.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
FIG. 1 shows a preferred embodiment of a waste heat comprehensive utilization system of a waste incineration plant; the comprehensive waste heat utilization system comprises a waste heat boiler 1, a primary flue gas heat exchanger 2, a semi-dry reaction tower 3, a bag-type dust collector 4, a flue gas reheater 5, a steam-flue gas preheater 6, an SCR denitration system 7, a secondary flue gas heat exchanger 8 and a chimney 9; the primary flue gas heat exchanger 2, the flue gas reheater 5 and the secondary flue gas heat exchanger 8 are all provided with a flue gas inlet, a flue gas outlet, a water inlet and a water outlet, and heat exchange pipelines are arranged in the primary flue gas heat exchanger 2, the flue gas reheater 5 and the secondary flue gas heat exchanger 8; the system comprises a waste heat boiler 1, a primary flue gas heat exchanger 2, a semi-dry type reaction tower 3, a bag-type dust collector 4, a flue gas reheater 5, a steam-flue gas preheater 6, an SCR denitration system 7, a secondary flue gas heat exchanger 8 and a chimney 9 which are connected in sequence, so that outlet flue gas of the waste heat boiler 1 enters the chimney 9 through the primary flue gas heat exchanger 2, the semi-dry type reaction tower 3, the bag-type dust collector 4, the flue gas reheater 5, the steam-flue gas preheater 6, the SCR denitration system 7 and the secondary flue gas heat exchanger 8 in sequence; the water inlet of the flue gas reheater 5 is connected with the water supplementing device 13, the water outlet of the flue gas reheater 5 is respectively connected with the water inlet of the first-stage flue gas heat exchanger 2 and the water inlet of the second-stage flue gas heat exchanger 8 through pipelines, and the water outlet of the first-stage flue gas heat exchanger 2 and the water outlet of the second-stage flue gas heat exchanger 8 are respectively connected with the water inlet of the flue gas reheater 5 through pipelines.
The waste heat comprehensive utilization system also comprises a first flue gas bypass 10, a second flue gas bypass 11 and a third flue gas bypass 12; the first flue gas bypass 10 is connected between the waste heat boiler 1 and the semi-dry type reaction tower 3 and is arranged in parallel with the primary flue gas heat exchanger 2; the second flue gas bypass 11 is connected between the bag-type dust collector 4 and the steam-flue gas preheater 6 and is arranged in parallel with the flue gas reheater 5; the third flue gas bypass 13 is connected between the SCR denitration system 7 and the chimney 9, and is arranged in parallel with the second-stage flue gas preheater 8.
In order to realize the on-off control of each flue gas bypass, a flue gas control valve 14 is arranged on each of the first flue gas bypass 10, the second flue gas bypass 11 and the third flue gas bypass 12; furthermore, in order to realize the on-off control of each water path, a water path control valve 15 is arranged on a pipeline between the water outlet of the flue gas reheater 5 and the water inlet of the primary flue gas heat exchanger 2, a pipeline between the water outlet of the flue gas reheater 5 and the water inlet of the secondary flue gas heat exchanger 8, a pipeline between the water inlet of the flue gas reheater 5 and the water outlet of the primary flue gas heat exchanger 2, and a pipeline between the water inlet of the flue gas reheater 5 and the water outlet of the secondary flue gas heat exchanger 8.
The heat exchange surfaces of the primary flue gas heat exchanger 10, the secondary flue gas heat exchanger 11 and the flue gas reheater 12 are made of ND steel.
In addition, the primary flue gas heat exchanger 10, the secondary flue gas heat exchanger 11 and the flue gas reheater 12 are all provided with steam soot blowers (not shown in the figure). The steam blown out by the steam soot blower can sweep the accumulated dust in the primary flue gas heat exchanger, the secondary flue gas heat exchanger and the flue gas reheater.
The working process of the waste heat comprehensive utilization system of the waste incineration power station is as follows:
outlet flue gas of the waste heat boiler sequentially passes through a primary flue gas heat exchanger 2, a semi-dry reaction tower 3, a bag-type dust collector 4, a flue gas reheater 5, a steam-flue gas preheater 6, an SCR denitration system 7 and a secondary flue gas heat exchanger 8 and then enters a chimney 9 to be discharged; in the flowing process of the flue gas, heat exchange is generated between the flue gas and circulating water; the specific heat exchange process is as follows: the water supplementing device 13 supplements circulating water through a water inlet of the flue gas reheater 5, the circulating water flows out through a water outlet of the flue gas reheater 5, one part of the circulating water enters the primary flue gas heat exchanger 2 through a pipeline, and the other part of the circulating water enters the secondary flue gas heat exchanger 8 through a pipeline; the outlet flue gas of the waste heat boiler 1 enters the primary flue gas heat exchanger 2 to exchange heat with the circulating water in the primary flue gas heat exchanger 2, the outlet flue gas of the waste heat boiler 1 releases heat, and the circulating water after heat absorption flows out from a water outlet of the primary flue gas heat exchanger 2 and returns to the flue gas reheater 5 through a pipeline; in addition, the flue gas flowing out from the flue gas outlet of the SCR denitration system 7 enters the secondary flue gas heat exchanger 8 to exchange heat with circulating water in the secondary flue gas heat exchanger 8, the flue gas releases heat, and the circulating water absorbing heat flows out from the water outlet of the secondary flue gas heat exchanger 8 and returns to the flue gas reheater 5 through a pipeline; the flue gas that flows out from the flue gas outlet of sack cleaner 4 gets into flue gas reheater 5, and the two ways of circulating water after being heated that return to flue gas reheater 5 releases the heat in flue gas reheater 5, heats the flue gas that flows out to the flue gas outlet of sack cleaner 4. The flue gas flowing out of the flue gas outlet of the flue gas reheater 5 enters a steam-flue gas preheater 6, and the flue gas is heated again by using steam; the flue gas reheater 5 and the steam-flue gas preheater 6 are matched for heating, so that the temperature of flue gas entering an inlet of the SCR denitration system 7 can reach normal working temperature.
When the primary flue gas heat exchanger 2 breaks down, the flue gas at the outlet of the waste heat boiler can enter the semi-dry reaction tower 3 through the first flue gas bypass 10.
When the flue gas reheater 5 fails, the outlet flue gas of the bag-type dust collector 4 can enter the steam-flue gas preheater 6 through the second flue gas bypass 11.
When the secondary flue gas heat exchanger 8 breaks down, the outlet flue gas of the SCR denitration system 7 can enter the chimney 9 through the third flue gas bypass 12.
The utility model discloses a system can utilize exhaust-heat boiler 1's export flue gas waste heat and SCR deNOx systems 7's export flue gas waste heat to the export flue gas of sack cleaner 4 and heat, not only can guarantee that the entry flue gas that gets into SCR deNOx systems 7 reaches normal operating temperature, can reduce steam-flue gas preheater 6's steam quantity in addition, has realized the recycle of energy, has improved the waste incineration power factory thermal efficiency and has reduced the energy waste. Furthermore, the utility model discloses utilize one-level gas heater 10, second grade gas heater 11 and flue gas reheater 12 to replace the flue gas-gas heater who uses among the prior art to prevent the production of the flue gas short circuit phenomenon that leads to because of the heat-transfer surface wearing and tearing of flue gas-gas heater corrodes, thereby guarantee the effective control of pollutant emission index.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (6)
1. The utility model provides a waste incineration power plant waste heat comprehensive utilization system which characterized in that: the system comprises a waste heat boiler, a primary flue gas heat exchanger, a semi-dry reaction tower, a bag-type dust collector, a flue gas reheater, a steam-flue gas preheater, an SCR denitration system, a secondary flue gas heat exchanger and a chimney; the primary flue gas heat exchanger, the flue gas reheater and the secondary flue gas heat exchanger are all provided with a flue gas inlet, a flue gas outlet, a water inlet and a water outlet, the waste heat boiler, the primary flue gas heat exchanger, the semi-dry reaction tower, the bag-type dust collector, the flue gas reheater, the steam-flue gas preheater, the SCR denitration system, the secondary flue gas heat exchanger and the chimney are sequentially connected, so that outlet flue gas of the waste heat boiler sequentially enters the chimney through the primary flue gas heat exchanger, the semi-dry reaction tower, the bag-type dust collector, the flue gas reheater, the steam-flue gas preheater, the SCR denitration system; the water inlet of the flue gas reheater is connected with a water supplementing device, the water outlet of the flue gas reheater is respectively connected with the water inlet of the first-stage flue gas heat exchanger and the water inlet of the second-stage flue gas heat exchanger through pipelines, and the water outlet of the first-stage flue gas heat exchanger and the water outlet of the second-stage flue gas heat exchanger are respectively connected with the water inlet of the flue gas reheater through pipelines.
2. The waste heat comprehensive utilization system of the waste incineration power station as claimed in claim 1, characterized in that: the system also comprises a first flue gas bypass, a second flue gas bypass and a third flue gas bypass; the first flue gas bypass is connected between the waste heat boiler and the semi-dry type reaction tower and is arranged in parallel with the primary flue gas heat exchanger; the second flue gas bypass is connected between the bag-type dust collector and the steam-flue gas preheater and is arranged in parallel with the flue gas reheater; the third flue gas bypass is connected between the SCR denitration system and the chimney and is arranged in parallel with the second-stage flue gas preheater.
3. The waste heat comprehensive utilization system of the waste incineration power station as claimed in claim 2, characterized in that: and the first flue gas bypass, the second flue gas bypass and the third flue gas bypass are respectively provided with a flue gas control valve.
4. The waste heat comprehensive utilization system of the waste incineration power station as claimed in claim 1, characterized in that: and waterway control valves are arranged on a pipeline between a water outlet of the flue gas reheater and a water inlet of the primary flue gas heat exchanger, a pipeline between a water outlet of the flue gas reheater and a water inlet of the secondary flue gas heat exchanger, a pipeline between a water inlet of the flue gas reheater and a water outlet of the primary flue gas heat exchanger, and a pipeline between a water inlet of the flue gas reheater and a water outlet of the secondary flue gas heat exchanger.
5. The waste heat comprehensive utilization system of the waste incineration power station as claimed in claim 1, characterized in that: and the heat exchange surfaces of the primary flue gas heat exchanger, the secondary flue gas heat exchanger and the flue gas reheater are made of ND steel.
6. The waste heat comprehensive utilization system of the waste incineration power station as claimed in claim 1, characterized in that: and the primary flue gas heat exchanger, the secondary flue gas heat exchanger and the flue gas reheater are all provided with steam soot blowers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021034462.2U CN212430917U (en) | 2020-06-08 | 2020-06-08 | Waste incineration power station waste heat comprehensive utilization system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021034462.2U CN212430917U (en) | 2020-06-08 | 2020-06-08 | Waste incineration power station waste heat comprehensive utilization system |
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| CN212430917U true CN212430917U (en) | 2021-01-29 |
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| CN202021034462.2U Active CN212430917U (en) | 2020-06-08 | 2020-06-08 | Waste incineration power station waste heat comprehensive utilization system |
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