CN111138067A - Dryer waste heat recovery system - Google Patents
Dryer waste heat recovery system Download PDFInfo
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- CN111138067A CN111138067A CN201911392320.5A CN201911392320A CN111138067A CN 111138067 A CN111138067 A CN 111138067A CN 201911392320 A CN201911392320 A CN 201911392320A CN 111138067 A CN111138067 A CN 111138067A
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- heat recovery
- waste heat
- dryer
- drying equipment
- condensed water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
Abstract
The invention discloses a dryer waste heat recovery system which is matched with drying equipment and comprises a waste gas waste heat recovery assembly and a condensed water waste heat recovery assembly, wherein the assembly inlet end of the waste gas waste heat recovery assembly is connected with a waste gas outlet of the drying equipment, the assembly outlet end of the waste gas waste heat recovery assembly is connected with an air inlet of the drying equipment, the assembly inlet end of the condensed water waste heat recovery assembly is connected with a condensed water outlet of the drying equipment, one path of the assembly outlet end of the condensed water waste heat recovery assembly is connected with a heating coil in an external raw material sludge bin, and the other path of the assembly outlet end of the condensed water waste heat recovery assembly is connected with a heating sleeve outside a raw material sludge. The invention realizes the preheating of the air and the raw sludge entering the drier by mainly utilizing the heat of the condensed water and the waste gas discharged by the disc drier, thereby not only accelerating the drying efficiency of the raw sludge, but also reducing the steam consumption of the disc drier.
Description
Technical Field
The invention relates to a waste heat recovery system, in particular to a dryer waste heat recovery system adaptive to a disc dryer in the prior art, and belongs to the technical field of sludge treatment.
Background
With the acceleration of the urbanization process in China, the construction of sewage treatment facilities in cities and various technologies related to sewage treatment are developed at a high speed. Under the prior art conditions, a large amount of excess sludge is generated during sewage treatment, and the sludge is large in total amount and is speeded up rapidly. By 2015, the daily treatment capacity of urban sewage plants in China reaches 13784 ten thousand cubic meters, the annual sludge production amount is about 3500 million tons, and the urban sludge yield in China is estimated to reach 6000 million tons to 9000 million tons by 2020.
In the current situation, after the municipal sludge is mechanically dewatered, the water content of the municipal sludge is still as high as about 80%, and in order to realize resource utilization of the sludge, the water content of the sludge needs to be reduced to below 30% by adopting a thermal drying and dewatering technology. The thermal drying dehydration technology usually uses steam as a heat source, and performs thermal drying in drying equipment such as a disc dryer, a paddle dryer, a drum dryer, a rake dryer and the like by using an indirect heating mode, so that the steam is condensed into isothermal condensed water, and moisture in sludge is evaporated into water steam and discharged along with sucked air.
Among the various drying devices, the disc dryer is the mainstream machine type in the field of sludge drying in China, and after the disc dryer is introduced from abroad, the structure of the disc dryer is not improved basically, and the disc dryer has the defects of large quantity of heat energy which cannot be utilized, large steam consumption and low heat efficiency.
When the disc dryer works, in order to bring out dry waste steam in time, air is sucked; however, since the sucked air and the raw sludge are not preheated, which is generally only 25 ℃, when these materials are fed into the disc dryer, the steam consumption is inevitably increased.
Taking the conventional disc dryer for treating 100T sludge daily as an example, when the water content of the sludge is reduced from 80% to 30%, the steam consumption is 1535kg/h, the energy consumption is 975600kj/h, the air consumption is 2484kg/h, the energy consumption is 70760kj/h, the self-produced non-condensable gas amount is 309.5kg/h, the total exhaust gas amount at an air outlet is 2793.5kg/h, the energy consumption is about 5903000kj/h, and the drying dehydration amount is 2122 kg/h. The combination of the above data shows that the sensible heat of the condensed water and the sensible heat and latent heat of a large amount of discharged exhaust gas are not utilized.
In summary, how to provide a brand-new dryer waste heat recovery system to effectively realize the heat energy recovery of the drying equipment in the prior art becomes a problem to be solved by technical personnel in the industry at present.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a dryer waste heat recovery system adapted to a drying apparatus of the prior art, as follows.
A dryer waste heat recovery system is matched with drying equipment and comprises a waste gas waste heat recovery assembly and a condensate waste heat recovery assembly, wherein the waste gas waste heat recovery assembly is used for collecting waste heat of a waste gas part discharged by the drying equipment;
the inlet end of the waste gas waste heat recovery assembly is connected with the waste gas outlet of the drying equipment, and the outlet end of the waste gas waste heat recovery assembly is connected with the air inlet of the drying equipment;
the subassembly entrance point of congealing water waste heat recovery subassembly with drying equipment's the discharge port of congealing water is connected, the subassembly exit end of congealing water waste heat recovery subassembly is connected with the heating coil in the outside raw materials mud storehouse all the way, another way is connected with the outside heating jacket pipe of raw materials mud pipeline.
Preferably, the drying apparatus is any one of a disc dryer, a paddle dryer, a drum dryer, and a rake dryer.
Preferably, the drying apparatus is a disc dryer.
Preferably, the waste heat recovery assembly comprises a multi-ring dust remover and a multi-ring air preheater;
the inlet end of the multi-ring type dust remover is used as the component inlet end of the waste gas waste heat recovery component and is connected with the waste gas outlet of the drying equipment, one path of outlet end of the multi-ring type dust remover is connected with the inlet end of the multi-ring type air preheater, and the other path of outlet end of the multi-ring type dust remover is connected with the raw sludge feeding port of the drying equipment;
one path of inlet end of the multi-loop air preheater is connected with one path of outlet end of the multi-loop dust remover, and one path of outlet end of the multi-loop air preheater is used as the component outlet end of the waste gas waste heat recovery component and is connected with the air inlet of the drying equipment.
Preferably, the exhaust gas waste heat recovery assembly further comprises a multi-ring type final cooler;
the inlet end of the multi-ring type final cooler is connected with the outlet end of the other path of the multi-ring type air preheater, and the outlet end of the multi-ring type final cooler is connected with an external waste gas deodorization system.
Preferably, the other inlet end of the multi-ring air preheater is used as an air inlet and communicated with the external atmosphere;
the multi-ring type final cooler is internally provided with a cooling pipeline in a surrounding manner, and a circulating water inlet and a circulating water outlet of the cooling pipeline are connected with an external water path.
Preferably, the condensed water waste heat recovery assembly comprises a condensed water tank and a condensed water pump;
the inlet end of the condensed water tank is used as the component inlet end of the condensed water waste heat recovery component and is connected with the condensed water outlet of the drying equipment, and the outlet end of the condensed water tank is connected with the inlet end of the condensed water pump;
the inlet end of the condensate pump is connected with the outlet end of the condensate tank, and the outlet end of the condensate pump is used as the component outlet end of the condensate waste heat recovery component and is connected with a heating coil in an external raw material sludge bin.
Preferably, the inside heating coil that is provided with in raw materials mud storehouse, raw materials mud storehouse external connection has the raw materials sludge pump, the raw materials sludge pump with the help of raw materials sludge pipeline with drying equipment's raw materials mud is sent into the mouth and is connected, raw materials sludge pipeline's periphery side cover is equipped with heating sleeve, heating coil's one end with the exit end of congealing the water pump is connected, heating coil's the other end with heating sleeve is connected, heating sleeve's periphery side has still been seted up and has been congealed the water export.
Preferably, the connection mode among all the components in the system is pipeline connection.
Compared with the prior art, the invention has the advantages that:
the waste heat recovery system of the dryer is matched with a disc dryer which is commonly used in the industry at present, and the preheating of air and raw sludge entering the dryer is realized by utilizing the heat of condensed water and waste gas discharged by the disc dryer, so that the drying efficiency of the raw sludge is accelerated, and the steam consumption of the disc dryer is reduced.
Meanwhile, as the raw sludge is subjected to preheating treatment, the viscosity of the sludge is obviously reduced after the temperature is increased, so that the conveying process is smoother, and the power consumption of the raw sludge pump is further reduced.
In addition, the invention also provides a reference basis for the design scheme of other drying equipment waste heat recovery systems in the field, and a user can apply the waste heat recovery system to other related equipment and technical schemes through the adaptive adjustment and improvement of the waste heat recovery system, so that the waste heat recovery system has a very wide application prospect.
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of facilitating understanding and understanding of the technical solutions of the present invention.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein: 1. An exhaust gas outlet; 2. an air flow inlet; 3. a condensed water outlet; 4. raw sludge is fed into an inlet; 5. a sludge discharge port; 6. a multi-ring type dust remover; 7. a multi-turn air preheater; 8. a multi-ring final cooler; 9. a cooling pipeline; 10. a condensate tank; 11. a condensate pump; 12. a raw material sludge bin; 13. a heating coil; 14. a raw sludge pump; 15. a raw sludge conveying pipeline; 16. heating the sleeve; 17. and a condensed water outlet.
Detailed Description
As shown in fig. 1, the present invention discloses a waste heat recovery system of a dryer adapted to a drying apparatus in the prior art, which is as follows.
A waste heat recovery system of a dryer is matched with a drying device, wherein the drying device can be any one of a disc dryer, a blade dryer, a roller dryer and a rake dryer, and the disc dryer is preferred in the embodiment. The drying equipment is provided with a sludge discharge port 5.
The system comprises a waste gas waste heat recovery assembly for collecting the waste heat of the waste gas part discharged by the drying equipment and a condensed water waste heat recovery assembly for collecting the waste heat of the condensed water part discharged by the drying equipment. The inlet end of the waste gas waste heat recovery assembly is connected with the waste gas outlet 1 of the drying equipment, and the outlet end of the waste gas waste heat recovery assembly is connected with the air inlet 2 of the drying equipment. The subassembly entrance point of congealing water waste heat recovery subassembly with drying equipment's the water discharge port 3 of congealing is connected, the subassembly exit end of congealing water waste heat recovery subassembly is connected with heating coil 13 in the outside raw materials mud storehouse 12 all the way, another way is connected with the outside heating jacket 16 of raw materials mud pipeline 15.
Further, the waste heat recovery assembly comprises a multi-ring dust collector 6 and a multi-ring air preheater 7.
The inlet end of the multi-ring dust remover 6 is used as the component inlet end of the waste gas waste heat recovery component and is connected with the waste gas discharge port 1 of the drying equipment, one path of outlet end of the multi-ring dust remover 6 is connected with the inlet end of the multi-ring air preheater 7, and the other path of outlet end of the multi-ring dust remover is connected with the raw sludge feeding port 4 of the drying equipment.
One path of inlet end of the multi-ring air preheater 7 is connected with one path of outlet end of the multi-ring dust remover 6, one path of outlet end of the multi-ring air preheater 7 is used as an assembly outlet end of the waste gas waste heat recovery assembly and is connected with the air inlet 2 of the drying equipment, and the other path of inlet end of the multi-ring air preheater 7 is used as an air inlet and is communicated with the outside atmosphere.
Besides the above hardware, the exhaust gas waste heat recovery assembly further comprises a multi-ring type final cooler 8.
The inlet end of one way of the multi-ring type final cooler 8 is connected with the outlet end of the other way of the multi-ring type air preheater 7, and the outlet end of the other way of the multi-ring type final cooler 8 is connected with an external waste gas deodorization system. The inside cooling pipeline 9 that still encircles of multiloop formula final cooler 8, the circulating water import and the circulating water export of cooling pipeline 9 all are connected with outside water route.
Further, the condensed water waste heat recovery assembly comprises a condensed water tank 10 and a condensed water pump 11.
The inlet end of the condensed water tank 10 is used as the component inlet end of the condensed water waste heat recovery component, and is connected with the condensed water outlet 3 of the drying device (in this embodiment, the condensed water outlet 3 of the drying device is the same as the steam inlet), and the outlet end of the condensed water tank 10 is connected with the inlet end of the condensed water pump 11.
The entrance point of the condensate pump 11 is connected with the exit end of the condensate tank 10, and the exit end of the condensate pump 11 is used as the component exit end of the condensate waste heat recovery component and is connected with the heating coil 13 in the external raw material sludge bin 12.
Raw materials mud storehouse 12 is inside to be provided with heating coil 13, raw materials mud storehouse 12 external connection has raw materials mud pump 14, raw materials mud pump 14 with the help of raw materials mud pipeline 15 with drying equipment's raw materials mud send into mouth 4 and is connected, raw materials mud pipeline 15's periphery side cover is equipped with heating sleeve 16, heating coil 13's one end with the exit end of congealing water pump 11 is connected, heating coil 13's the other end with heating sleeve 16 is connected, the export 17 of congealing water has still been seted up to heating sleeve 16's periphery side.
It should be added that, in this scheme, the connection mode between each component in the system is pipeline connection.
The waste heat recovery system of the dryer is matched with a disc dryer which is commonly used in the industry at present, and the preheating of air and raw sludge entering the dryer is realized by utilizing the heat of condensed water and waste gas discharged by the disc dryer, so that the drying efficiency of the raw sludge is accelerated, and the steam consumption of the disc dryer is reduced.
Meanwhile, as the raw sludge is subjected to preheating treatment, the viscosity of the sludge is obviously reduced after the temperature is increased, so that the conveying process is smoother, and the power consumption of the raw sludge pump is further reduced.
The following three tables quantify the effects of waste heat recovery and different preheating temperatures of the prior art scheme and the novel scheme. Wherein, the first table is a material balance and heat balance table when waste heat recovery is not carried out; the second table is a material balance and heat balance table when the material is preheated to 80 ℃; and the third table is a material balance and heat balance table when the material is preheated to 90 ℃.
Watch 1
| Square entry | Delivery side |
| Steam 7594000j/h | Exhaust 5903000 j/h |
| Air (25 ℃ C.) 70760j/h | Condensed water 975600kj/h |
| Raw sludge (25 ℃) 395200j/h | Dry sludge 628900kj/h |
| Heat loss 560500j/h | |
| Total 8068000 j/h | Total of 8068000 j/h |
Watch two
| Square entry | Delivery side |
| Steam 6577000j/h | Exhaust 5903000 j/h |
| Air (80 ℃ C.) 226400j/h | Condensed water 975600kj/h |
| Raw sludge (80 ℃) 126500j/h | Dry sludge 628900kj/h |
| Heat loss 560500j/h | |
| Total 8068000 j/h | Total 8068000 j/h |
The steam consumption ratio after preheating is 6577000/7594000= 86.6%;
watch 1
| Square entry | Delivery side |
| Steam 6319000j/h | Exhaust 5903000 j/h |
| Air (90 ℃ C.) 254700j/h | Condensed water 975600kj/h |
| Raw sludge (90 ℃) 1423000j/h | Dry sludge 628900kj/h |
| Heat loss 560500j/h | |
| Total 8068000 j/h | Total 8068000 j/h |
The steam consumption ratio after preheating was 6319000/7594000= 83.21%.
The results show that the steam 7594000j/h without recovery of waste heat is set to be 100 percent, and when the air and the raw sludge are preheated to 80 ℃, the energy can be saved by 13.4 percent; and when the air and the raw sludge are preheated to 90 ℃, the energy can be saved by 17.8 percent. The energy-saving effect is obvious.
In addition, the invention also provides a reference basis for the design scheme of other drying equipment waste heat recovery systems in the field, and a user can apply the waste heat recovery system to other related equipment and technical schemes through the adaptive adjustment and improvement of the waste heat recovery system, so that the waste heat recovery system has a very wide application prospect.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a desiccator waste heat recovery system, and drying equipment phase-match, its characterized in that: the waste gas waste heat recovery device comprises a waste gas waste heat recovery component for collecting waste heat of a waste gas part discharged by drying equipment and a condensed water waste heat recovery component for collecting waste heat of a condensed water part discharged by the drying equipment;
the inlet end of the waste gas waste heat recovery assembly is connected with a waste gas outlet (1) of the drying equipment, and the outlet end of the waste gas waste heat recovery assembly is connected with an air inlet (2) of the drying equipment;
the subassembly entrance point of congealing water waste heat recovery subassembly with drying equipment congeals water discharge port (3) and is connected, congeal water waste heat recovery subassembly's subassembly exit end and be connected with heating coil (13) in outside raw materials mud storehouse (12) all the way, another way is connected with outside heating jacket pipe (16) of raw materials mud pipeline (15).
2. The dryer waste heat recovery system of claim 1, wherein: the drying equipment is any one of a disc dryer, a paddle dryer, a roller dryer and a rake dryer.
3. The dryer waste heat recovery system of claim 1, wherein: the drying equipment is a disc dryer.
4. The dryer waste heat recovery system of claim 1, wherein: the waste gas waste heat recovery assembly comprises a multi-ring type dust remover (6) and a multi-ring type air preheater (7);
the inlet end of the multi-ring type dust remover (6) is used as the component inlet end of the waste gas waste heat recovery component and is connected with the waste gas outlet (1) of the drying equipment, one outlet end of the multi-ring type dust remover (6) is connected with the inlet end of the multi-ring type air preheater (7), and the other outlet end of the multi-ring type dust remover is connected with the raw sludge feeding port (4) of the drying equipment;
one path of inlet end of the multi-ring type air preheater (7) is connected with one path of outlet end of the multi-ring type dust remover (6), and one path of outlet end of the multi-ring type air preheater (7) is used as the component outlet end of the waste gas waste heat recovery component and is connected with the air inflow port (2) of the drying equipment.
5. The dryer waste heat recovery system of claim 4, wherein: the waste gas waste heat recovery assembly also comprises a multi-ring type final cooler (8);
the inlet end of the multi-ring type final cooler (8) is connected with the outlet end of the other path of the multi-ring type air preheater (7), and the outlet end of the multi-ring type final cooler (8) is connected with an external waste gas deodorization system.
6. The dryer waste heat recovery system of claim 5, wherein: the other inlet end of the multi-ring air preheater (7) is used as an air inlet and is communicated with the outside atmosphere;
the multi-ring type final cooler (8) is internally provided with a cooling pipeline (9) in a surrounding manner, and a circulating water inlet and a circulating water outlet of the cooling pipeline (9) are connected with an external water path.
7. The dryer waste heat recovery system of claim 1, wherein: the condensed water waste heat recovery assembly comprises a condensed water tank (10) and a condensed water pump (11);
the inlet end of the condensed water tank (10) is used as the component inlet end of the condensed water waste heat recovery component and is connected with a condensed water outlet (3) of the drying equipment, and the outlet end of the condensed water tank (10) is connected with the inlet end of the condensed water pump (11);
the inlet end of the condensate pump (11) is connected with the outlet end of the condensate tank (10), and the outlet end of the condensate pump (11) serves as the component outlet end of the condensate waste heat recovery component and is connected with a heating coil (13) in an external raw material sludge bin (12).
8. The dryer waste heat recovery system of claim 7, wherein: raw materials mud storehouse (12) inside is provided with heating coil (13), raw materials mud storehouse (12) external connection has raw materials mud pump (14), raw materials mud pump (14) with the help of raw materials mud pipeline (15) with drying equipment's raw materials mud send into mouth (4) and is connected, the periphery side cover of raw materials mud pipeline (15) is equipped with heating sleeve (16), the one end of heating coil (13) with the exit end of water pump (11) is congealed and is connected, the other end of heating coil (13) with heating sleeve (16) are connected, the periphery side of heating sleeve (16) has still been seted up and has been congealed water export (17).
9. The dryer waste heat recovery system according to any one of claims 1 to 8, characterized in that: the connection mode among all parts in the system is pipeline connection.
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