CN218435491U - Sludge drying system of waste incineration power plant - Google Patents
Sludge drying system of waste incineration power plant Download PDFInfo
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- CN218435491U CN218435491U CN202221441470.8U CN202221441470U CN218435491U CN 218435491 U CN218435491 U CN 218435491U CN 202221441470 U CN202221441470 U CN 202221441470U CN 218435491 U CN218435491 U CN 218435491U
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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
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Abstract
The utility model discloses a waste incineration power plant sludge drying system. The system comprises a waste incineration power generation system, a heat pump system, a sludge drying system and a variable frequency fan; the waste incineration power generation system is respectively connected with the heat pump system and the sludge drying system; the variable frequency fan is respectively connected with the waste incineration power generation system, the heat pump system and the sludge drying system; the sludge drying system comprises a low-temperature belt type sludge drying machine, a dust remover and a condenser; the low-temperature belt type sludge drier, the dust remover and the condenser are sequentially connected; the condenser is connected with a circulating cooling tower of the waste incineration power generation system; the low-temperature belt type sludge drier is respectively connected with an incinerator of the waste incineration power generation system, a condenser of the heat pump system and the variable frequency fan. The utility model discloses the utensil reduces recirculated cooling water consumption, and the energy saving reduces the energy consumption, realizes the advantage of mud energy-conservation, economic mummification in the msw incineration power plant.
Description
Technical Field
The utility model relates to a sludge drying field, more specifically says that it is a sludge drying system of msw incineration power plant.
Background
The sludge of the urban sewage treatment plant is a product of sewage treatment and mainly comes from a primary sedimentation tank, a secondary sedimentation tank and other process links. The sludge yield (according to the water content of 80%) of treated sewage per ten thousand m < 3 > is generally about 5-10 t, and the specific yield depends on factors such as drainage system, inflow water quality, sewage and sludge treatment process and the like. With the development of economic society, the sludge yield is increased day by day, and the annual yield dry weight of the sewage and the sludge in China is 1447 ten thousand tons in 2020.
At present, the main methods for sludge disposal comprise sludge landfill, sludge incineration, sludge biological treatment and the like. From the viewpoint of the effect of disposal, a sludge treatment technology based on incineration is the most thorough method of sludge treatment. It has several distinct advantages: 1) Incineration can greatly reduce the volume and weight of the sludge. 2) Incineration can kill all pathogens. 3) The dehydrated sludge has a higher calorific value.
In incineration equipment such as a mechanical grate furnace, a fluidized bed furnace, a rotary kiln and the like of a household garbage incineration plant, sludge can be mixed with household garbage for incineration in a direct feeding mode or a mixed feeding mode.
The sludge has a certain heat value after being dried, and the dried sludge is mixed with the household garbage for burning, so that the waste heat of a garbage incineration plant can be used as a drying heat source, the existing incineration and tail gas treatment equipment of the garbage incineration plant can be used, and the investment and the operation cost are saved.
At present, drying equipment adopted by a waste incineration power plant for cooperatively treating sludge mainly comprises an indirect drying disc dryer and a direct drying low-temperature belt type sludge dryer. The disc drier generally adopts 0.5-0.8 MPa saturated steam as a heat source to enter the disc drying disc and the shell to indirectly dry sludge, the steam has higher quality requirement, and a high-power motor is required to drive the disc to move; the low-temperature belt type sludge drier is generally characterized in that hot air is directly contacted with sludge to evaporate moisture in the sludge, moisture-containing carrier gas absorbs heat of the carrier gas through a heat pump evaporator and then condenses and discharges the moisture in the carrier gas, the carrier gas absorbs the heat of the evaporator through a heat pump condenser and is compressed by a compressor to generate heat and then enters the belt type sludge drier, the low-temperature belt type sludge drier is low in driving power, but the heat quality of the carrier gas at the outlet of the drier is low, the power of the compressor is high, the carrier gas is circularly dried and dehumidified, volatile organic matters and corrosive gases in the sludge can be concentrated in the carrier gas, and certain potential safety hazards exist.
Therefore, it is necessary to develop a sludge drying system of a waste incineration power plant, which can reduce the consumption of circulating cooling water, save energy, reduce energy consumption and realize energy-saving and economic drying of sludge in the waste incineration power plant.
Disclosure of Invention
The utility model aims at providing a waste incineration power plant sludge drying system utilizes steam turbine exhaust latent heat and flue gas waste heat as sludge drying heating heat source, adopts low temperature belt sludge drying machine to carry out the mummification to mud, is in the same place the combination of the high-efficient economy of waste incineration electricity generation and sludge drying, effectively utilizes waste incineration power plant waste heat, reduces the recirculated cooling water consumption, and the energy saving reduces the energy consumption, realizes that mud is energy-conserving, the economic mummification in waste incineration power plant.
In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a waste incineration power plant sludge drying system which characterized in that: comprises a waste incineration power generation system, a heat pump system, a sludge drying system and a variable frequency fan;
the waste incineration power generation system is respectively connected with the heat pump system and the sludge drying system;
the variable frequency fan is respectively connected with the waste incineration power generation system, the heat pump system and the sludge drying system;
the sludge drying system comprises a low-temperature belt type sludge drying machine, a dust remover and a condenser; the low-temperature belt type sludge drier, the dust remover and the condenser are connected in sequence; the condenser is connected with a circulating cooling tower of the waste incineration power generation system; the low-temperature belt type sludge drier is respectively connected with an incinerator of the waste incineration power generation system, a condenser of the heat pump system and a variable frequency fan.
In the technical scheme, the waste incineration power generation system comprises an incinerator, a boiler, a flue gas purification system, an induced draft fan, a chimney, a turbonator, a deaerator, a low-temperature heater, a condenser and a circulating cooling tower;
the incinerator, the boiler, the flue gas purification system, the induced draft fan and the chimney are sequentially connected;
the boiler, the steam turbine generator, the condenser, the low-temperature heater and the deaerator are sequentially connected to form a circulation loop;
the condenser is connected with the circulating cooling tower to form a circulating loop;
the steam turbine generator is respectively connected with the deaerator and the low-temperature heater;
the variable frequency fan is connected to a communicating pipeline between the induced draft fan and the chimney;
the condenser is connected with the circulating cooling tower to form a circulating loop;
the condenser is connected with an on-site wastewater treatment system.
In the technical scheme, the condenser is connected with the incinerator through the secondary fan.
In the above technical solution, the heat pump system includes an evaporator, a compressor, a condenser and an expansion valve;
the boiler, the steam turbine generator, the evaporator, the low-temperature heater and the deaerator are sequentially connected to form a circulation loop;
the evaporator, the compressor, the condenser and the expansion valve are sequentially connected to form a circulation loop;
the condenser is connected with the variable frequency fan.
The working method of the sludge drying system of the waste incineration power plant comprises the following steps:
the waste incineration power generation system turbo generator steam exhaust part gets into the heat pump system evaporimeter, and the volume that the steam discharged got into the heat pump system is controlled through the governing valve, and the low-quality used heat of turbo generator steam exhaust is absorbed to the heat pump system evaporimeter, then through the compressor, promotes absorptive low-quality heat to high-quality heat, gives the air at the condenser with high-quality heat-conduction afterwards, heats the air.
The air is sent into the condenser of the heat pump system through the variable frequency fan to be heated, and the air is also provided with a bypass system and can not be heated by the heat pump system. In addition, part of purified flue gas is led out from the rear of the induced draft fan, the flow of the purified flue gas is controlled by an adjusting valve, and the purified flue gas and air are mixed to form dried gas at the temperature of 50-150 ℃ and then enter the low-temperature belt type sludge drier. Because the moisture content of the purified flue gas is high, no more than 40% of the purified flue gas is generally introduced, air is heated by a heat pump system, is mixed with the purified flue gas to adjust the temperature of the dried gas to a proper range, and then enters the low-temperature belt type sludge drier. When the heat pump system fails or other failures exist and the waste heat of the exhaust steam cannot be absorbed to heat the air, the exhaust steam of the steam turbine generator and the inlet and outlet valves of the heat pump system are closed, the air is directly mixed with the purified flue gas through the bypass, and the temperature of the dried gas is adjusted to be within a proper range through frequency conversion adjustment and the purified flue gas pipeline adjusting valve together according to the temperature fed back by the dried air temperature sensor at the inlet of the low-temperature belt type sludge drying machine.
The drying gas with the temperature of 50-150 ℃ enters a low-temperature belt type sludge drying machine, the drying gas is directly contacted with sludge to evaporate water in the sludge, the drying gas carries wet sludge evaporated water vapor to be discharged from an exhaust port of the low-temperature belt type sludge drying machine, discharged tail gas collects a small amount of dust discharged along with the tail gas in the sludge drying process through a dust remover, the tail gas after dust removal is condensed through a condenser, the water evaporated by sludge drying is condensed and discharged to a waste water treatment system in a factory for treatment, and the non-condensable gas of the tail gas enters an incinerator through a secondary fan. And (4) drying the sludge and then sending the dried sludge into an incinerator for incineration treatment.
The water content of the outlet dry sludge is controlled by adjusting the retention time of the sludge in the low-temperature belt type sludge drier, the temperature of the dried sludge and the air quantity.
The utility model has the advantages of as follows:
(1) The heat pump is adopted to recycle the low-quality waste heat of the steam exhaust of the steam turbine of the power plant, thereby not only recycling the heat of the exhaust steam, but also achieving the effect of exhaust steam condensation, reducing the consumption of circulating cooling water and saving energy;
(2) The temperature and the air quantity of the drying gas are regulated by using the purified flue gas, so that the waste heat of the purified flue gas is effectively utilized, and the energy consumption is reduced;
(3) Sludge drying heat energy all utilizes waste heat, waste heat of msw incineration power generation basically, and mummification back tail gas gets into waste incinerator as the overgrate air after power plant's circulative cooling system cools off the hydrofuge, and the mud after the mummification gets into incinerator and burns burning treatment, the utility model provides a sludge drying system and the organic combination of msw incineration power plant realize mud energy-conservation, the economic mummification in msw incineration power plant.
Drawings
FIG. 1 is a diagram of a sludge drying system of a waste incineration power plant of the utility model.
In fig. 1, a represents wet sludge; b represents tail gas; c represents dry sludge; d represents the drying gas.
In the figure, 1-a waste incineration power generation system, 11-an incinerator, 12-a boiler, 13-a flue gas purification system, 14-an induced draft fan, 15-a chimney, 16-a turbogenerator, 17-a deaerator, 18-a low-temperature heater, 19-a waste incineration power generation system condenser, 110-a circulating cooling tower, 2-a heat pump system, 21-an evaporator, 22-a compressor, 23-a heat pump system condenser, 24-an expansion valve, 3-a sludge drying system, 31-a low-temperature belt sludge drying machine, 32-a dust remover, 33-a condenser, 4-a variable frequency fan, 5-a secondary fan and 6-an on-site waste water treatment system.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the invention will be clear and readily appreciated by the description.
The utility model provides a waste incineration power plant sludge drying system utilizes steam turbine exhaust latent heat and flue gas waste heat as sludge drying heating heat source, adopts low temperature belt sludge drying machine to carry out the mummification to mud, economically high-efficiently imbeds waste incineration power plant with sludge drying.
Examples
Now use the utility model discloses it is right that the trial application is used for certain msw incineration power plant sludge drying to be the embodiment the utility model discloses carry out the detailed description, be applied to other msw incineration power plant sludge drying to the invention and have the guide effect equally.
In this embodiment, a waste incineration power plant is a 2X 500t/d waste incineration power plant, and 80t/d sludge drying is required.
In this embodiment, sludge drying in a certain waste incineration power plant specifically includes the following steps:
(1) Drying the municipal sludge with the water content of 80t/d from 80% to within 40%, and then feeding the municipal sludge into an incinerator 11 for incineration treatment together with garbage.
(2) A heat pump system 2, a sludge drying system 3 and a variable frequency fan 4 are additionally arranged in a waste incineration power plant.
(3) The steam exhaust pipeline of the steam turbine generator 16 is provided with a bypass and is connected with the inlet of an evaporator 21 of the heat pump system 2, and the outlet is connected to the pipeline of a hot port of the low-temperature heater 18. The variable frequency fan 4 sends air into an inlet of a condenser 23 of the heat pump system 2, an outlet of the variable frequency fan is connected with a dried gas inlet of the low-temperature belt type sludge drier 31, a bypass is arranged on an outlet flue of an induced draft fan 14 of the incineration system and is connected with an air pipeline at the outlet of the condenser 23, in addition, a bypass is arranged between the variable frequency fan 4 and the condenser 23 of the heat pump system 2, and the air can directly mix with purified flue gas without passing through the heat pump system 2 and then enters the sludge drier (namely, the low-temperature belt type sludge drier 31). The dried gas is discharged from a tail gas discharge port of a sludge drier (namely, a low-temperature belt type sludge drier 31), then enters a dust remover 32, is condensed by a condenser 33, and then enters a secondary air pipeline to enter a furnace. The dried tail gas condenser 33 leads out circulating cooling water from the power plant circulating cooling tower 110 to be used as a cold source, and condensed wastewater enters the in-plant wastewater treatment system 5.
(4) The exhaust part of a steam turbine generator 16 of the waste incineration power generation system 1 enters an evaporator 21 of a heat pump system 2, the amount of the exhaust entering the heat pump system 1 is controlled by a regulating valve, the evaporator 21 of the heat pump system 3 absorbs the latent heat of the exhaust of the steam turbine generator 16, then the latent heat passes through a compressor 22, and then the heat is transferred to air in a condenser 23 to heat the air to more than 50 ℃.
(5) Air is sent into a condenser 23 of the heat pump system 2 through a variable frequency fan 4 to be heated, meanwhile, part of purified flue gas is led out from the rear of an induced draft fan 14, the flow of the purified flue gas is controlled by a regulating valve, and the purified flue gas and the heated air are mixed to form dried gas with the temperature of about 80 ℃ and then enter a low-temperature belt type sludge drier 31. In addition, the air is also provided with a bypass system, and can be directly mixed with the purified flue gas without passing through the heat pump system 2.
(6) The drying gas enters the low-temperature belt type sludge drying machine 31, the drying gas is in direct contact with the sludge to evaporate water in the sludge, the drying gas carries wet sludge evaporated water vapor to be discharged from an exhaust port of the low-temperature belt type sludge drying machine 31, the discharged tail gas collects a small amount of dust discharged along with the tail gas in the sludge drying process through a dust collector 32, the dust-removed tail gas is condensed through a condenser 33, the moisture evaporated in the sludge drying process is condensed and discharged to a waste water treatment system 6 in a factory for treatment, and the non-condensable gas in the tail gas enters the incinerator 11 through a secondary fan 5. The sludge is dried and then sent to an incinerator 11 for incineration treatment.
(7) When the heat pump system 2 fails or other failures occur and the waste heat of the exhaust steam cannot be absorbed to heat the air, the exhaust steam of the steam turbine generator 16 and the inlet and outlet valves of the heat pump system 2 are closed, the air is directly mixed with the purified flue gas through a bypass, the temperature of the drying gas is adjusted to a proper range through the frequency conversion adjustment and purified flue gas pipeline adjusting valve, and then the drying gas enters the low-temperature belt type sludge drier 31.
The above description is only one embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Other parts not described belong to the prior art.
Claims (4)
1. The utility model provides a waste incineration power plant sludge drying system which characterized in that: comprises a waste incineration power generation system (1), a heat pump system (2), a sludge drying system (3) and a variable frequency fan (4);
the waste incineration power generation system (1) is respectively connected with the heat pump system (2) and the sludge drying system (3);
the variable frequency fan (4) is respectively connected with the waste incineration power generation system (1), the heat pump system (2) and the sludge drying system (3);
the sludge drying system (3) comprises a low-temperature belt type sludge drying machine (31), a dust remover (32) and a condenser (33); the low-temperature belt type sludge drier (31), the dust remover (32) and the condenser (33) are connected in sequence; the condenser (33) is connected with a circulating cooling tower (110) of the waste incineration power generation system (1); the low-temperature belt type sludge drier (31) is respectively connected with an incinerator (11) of the waste incineration power generation system (1), a heat pump system condenser (23) and a variable frequency fan (4).
2. The waste incineration power plant sludge drying system of claim 1, wherein: the waste incineration power generation system (1) comprises an incinerator (11), a boiler (12), a flue gas purification system (13), an induced draft fan (14), a chimney (15), a turbine generator (16), a deaerator (17), a low-temperature heater (18), a waste incineration power generation system condenser (19) and a circulating cooling tower (110);
the incinerator (11), the boiler (12), the flue gas purification system (13), the induced draft fan (14) and the chimney (15) are sequentially connected;
the boiler (12), the turbine generator (16), the condenser (19) of the waste incineration power generation system, the low-temperature heater (18) and the deaerator (17) are sequentially connected to form a circulation loop;
a condenser (19) of the waste incineration power generation system is connected with a circulating cooling tower (110) to form a circulating loop;
the steam turbine generator (16) is respectively connected with the deaerator (17) and the low-temperature heater (18);
the variable frequency fan (4) is connected to a communicating pipeline between the induced draft fan (14) and the chimney (15);
the condenser (33) is connected with the circulating cooling tower (110) to form a circulating loop;
the condenser (33) is connected with an on-site waste water treatment system (6).
3. The waste incineration power plant sludge drying system of claim 2, wherein: the condenser (33) is connected with the incinerator (11) through a secondary fan (5).
4. The waste incineration power plant sludge drying system of claim 3, wherein: the heat pump system (2) comprises an evaporator (21), a compressor (22), a heat pump system condenser (23) and an expansion valve (24);
the boiler (12), the turbine generator (16), the evaporator (21), the low-temperature heater (18) and the deaerator (17) are sequentially connected to form a circulation loop;
the evaporator (21), the compressor (22), the heat pump system condenser (23) and the expansion valve (24) are sequentially connected to form a circulation loop;
and a condenser (23) of the heat pump system is connected with the variable frequency fan (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221441470.8U CN218435491U (en) | 2022-06-09 | 2022-06-09 | Sludge drying system of waste incineration power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221441470.8U CN218435491U (en) | 2022-06-09 | 2022-06-09 | Sludge drying system of waste incineration power plant |
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| CN218435491U true CN218435491U (en) | 2023-02-03 |
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| CN202221441470.8U Active CN218435491U (en) | 2022-06-09 | 2022-06-09 | Sludge drying system of waste incineration power plant |
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