CN112028443B - Heat energy utilization integrated device, material drying system and drying method - Google Patents
Heat energy utilization integrated device, material drying system and drying method Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
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Abstract
The invention relates to the technical field of solid waste treatment, and discloses a heat energy utilization integrated device, a material drying system and a drying method. The shell of the invention is divided into three independent cavities which are horizontally arranged side by a partition board, an exhaust steam heat regeneration module, a heat energy lifting and converting module and a hot air heat absorption module are respectively arranged in the cavities, and a circulating medium independently circulates between the exhaust steam heat regeneration module and the hot air heat absorption module through the heat energy lifting and converting module. The invention has high cycle heat efficiency, low energy consumption and good system operation stability.
Description
Technical Field
The invention relates to the technical field of solid waste treatment, in particular to a heat energy utilization integrated device, a material drying system and a drying method.
Background
The material drying is an important link and key technology of chemical production in the processes of food processing treatment, solid waste treatment, mine slurry treatment and the like. In order to meet the requirement of wastewater discharge, high-temperature wastewater generated in the production process of the industry and the processing industry needs to be subjected to cooling treatment, so that a large amount of water resources and a large amount of heat energy are wasted.
The existing disposal mode of the sludge solid waste is usually coupled with the disposal of a large-scale coal-fired boiler, the process route mainly comprises two types of direct mixed combustion and drying mixed combustion, and the drying mixed combustion takes two types of steam drying and hot air drying as main processes.
The traditional steam disc sludge drying process has the advantages of mature technology, strong processing capacity, small influence on the environment, small occupied area and the like; the traditional hot air drying process has the advantages of mature technology, lower requirement on the quality of a heat source, strong adaptability of materials and the like. However, whether hot air drying or steam drying is adopted, high energy consumption becomes a brake for the development of the technology, and the market competitiveness of the process is greatly reduced.
At present, a two-stage steam-hot air waste heat utilization sludge drying process is provided, high-temperature and high-pressure steam condensate is flashed into low-temperature and low-pressure steam through flash evaporation equipment and is used for hot air reheating, a two-stage energy cascade utilization system is realized, the process can save the steam and achieve the purpose of energy saving, but in terms of actual production and operation, the limitation on feeding sludge is large, high-dust-content circulating hot air of the hot air drying system directly enters a waste steam heat regenerator of the steam drying system to exchange heat with dust-containing waste steam, and the waste steam heat regenerator is frequently blocked; according to the investigation of engineering sites, the regenerative heat exchanger needs to be shut down and cleaned once per week, and large-scale industrialized continuous operation is difficult to realize.
Disclosure of Invention
The invention provides a heat energy utilization integrated device, a material drying system and a drying method, which have the advantages of high cycle heat efficiency, low energy consumption and good system operation stability.
The technical problem to be solved is that: the existing waste treatment system has low waste heat utilization rate, large system operation energy consumption, complex pipeline structure of the waste heat utilization system and high maintenance cost.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a heat energy utilization integrated device, which comprises a shell and is characterized in that: the shell is internally divided into three independent cavities which are horizontally arranged side by side, an exhaust steam heat regeneration module, a heat energy lifting and converting module and a hot air heat absorption module are respectively arranged in the cavities, and a circulating medium independently circulates between the exhaust steam heat regeneration module and the hot air heat absorption module through the heat energy lifting and converting module;
the waste steam heat regeneration module comprises a waste steam heat exchange device positioned in the cavity, the hot air heat absorption module comprises a hot air heat exchange device positioned in the cavity, the heat energy lifting conversion module comprises a heat pump, a low-temperature outlet of a circulating medium of the heat pump is connected with a first inlet of the circulating medium in the waste steam heat exchange device through a low-dielectric inlet pipe, the first outlet of the circulating medium is communicated with a low-temperature inlet of the circulating medium of the heat pump through a low-dielectric return pipe, a high-temperature outlet of the circulating medium of the heat pump is communicated with a second inlet of the circulating medium in the hot air heat exchange device through a high-dielectric inlet pipe, and the second outlet is communicated with the low-dielectric inlet pipe through a liquid return pipe; the low dielectric inlet pipe, the low dielectric return pipe, the high dielectric inlet pipe and the liquid return pipe are respectively connected in series with a booster pump.
The heat energy utilization integrated device is characterized in that a first online cleaning device for cleaning an exhaust steam circulation pipeline is arranged at the top of the exhaust steam heat exchange device, and a second online cleaning device for cleaning a hot air circulation pipeline is arranged at the top of the hot air heat exchange device.
The heat energy utilization integrated device comprises a first online cleaning device, a second online cleaning device and a control system, wherein the first online cleaning device comprises a high-pressure nozzle arranged in a waste steam circulation pipeline and arranged close to a waste steam outlet, the high-pressure nozzle is connected with a cleaning water source through a hose, an electromagnetic valve is connected on the hose in series, and a signal output end of the electromagnetic valve is electrically connected with a signal input end of the electronic control system.
The invention utilizes the material drying system of the heat energy utilization integrated device, and also comprises a steam drying system and a hot air drying system,
the steam drying system comprises at least one steam drying machine and a steam exhaust condenser, a steam outlet of the steam drying machine is sequentially connected in series with a steam exhaust heat exchange device and the steam exhaust condenser in the heat energy utilization integrated device,
the hot air drying system comprises at least one hot air drying machine, a hot air condenser and a hot air reheater, wherein an air outlet of the hot air drying machine is sequentially connected with the hot air condenser, a hot air heat exchange device in the heat energy utilization integrated device and the hot air reheater in series through pipelines, and an air outlet of the hot air reheater is communicated with a hot air inlet of the hot air drying machine.
The material drying system is characterized in that a steam outlet of the steam drying machine is communicated with a steam exhaust inlet of a steam exhaust heat exchange device through a pipeline, and a steam exhaust outlet is connected with a steam exhaust condenser through a pipeline; the air outlet of the hot air drier is communicated with the heat source inlet of the hot air condenser, the heat source outlet of the hot air condenser is communicated with the hot air inlet of the hot air heat exchange device, and the hot air outlet of the hot air heat exchange device is communicated with the air inlet of the hot air reheater.
The material drying system is characterized in that a drain outlet of the steam drying machine is communicated with a hot air inlet of the hot air heat exchange device through a first branch pipe.
The material drying system is characterized in that a drain outlet of the hot air reheater is communicated with a hot air inlet of the hot air heat exchange device through a second parallel pipe.
The drying method of the material drying system comprises the following steps:
step one, the wet material enters a steam drier to be dried by distillation, high-temperature steam containing impurities is condensed after waste heat recovery and cooling, and the recovered waste heat enters a heat energy utilization integration device to be recycled;
and secondly, drying the wet material in a hot air drier, cooling and dewatering the hot air containing impurities and water vapor, preheating and heating the wet material again, then sending the wet material into the hot air drier for circularly drying, and heating the wet material by utilizing the heat energy recovered by a heat pump in the integrated device in the preheating process.
The drying method further comprises the following steps:
1.1, heating and evaporating the wet material by high-temperature steam, and discharging the evaporated wet material out of a steam drier;
1.2, the dried exhaust steam is subjected to heat energy recovery in a heat energy utilization integrated device, and is subjected to heat exchange with a circulating medium in an exhaust steam heat exchange device for cooling, the circulating medium recovers waste heat from the exhaust steam heat exchange device and then enters a heat pump, the heat pump heats part of the circulating medium and then sends the heated part of the circulating medium to a hot air heat absorption module for recycling, and the rest of the circulating medium is cooled and then is sent back to the exhaust steam heat exchange device for circulating heat absorption;
and 1.3, cooling the dried exhaust steam with the heat energy recovered, and then discharging the cooled exhaust steam out of the steam drying system for subsequent treatment.
The drying method further comprises the following steps:
2.1, heating and drying the wet material by high-temperature hot air, and discharging the dried material out of a hot air drier;
2.2, cooling the evaporated hot air containing impurities and water vapor to remove a large amount of water vapor and impurities in the hot air;
2.3, the hot air after cooling and drying enters a hot air heat exchange device, and the heat energy after being processed by the heat energy lifting and converting module is utilized for preheating;
2.4, the preheated hot air exchanges heat with high-temperature steam in a hot air reheater, and enters a hot air drier after being heated for recycling.
Compared with the prior art, the heat energy utilization integrated device, the material drying system and the drying method have the following beneficial effects:
the heat energy utilization integration device integrates the heat energy circulation systems of exhaust steam heat regeneration, hot air preheating and connection, integrates exhaust steam heat energy recovery and hot air preheating, and is used for connecting two processing lines of steam drying and hot air drying to realize the cyclic utilization of heat energy.
The heat pump used in the invention is a temperature-increasing heat pump, the heat energy recovered from the exhaust steam heat exchange device is concentrated into a part of circulating medium and is sent to the hot air heat exchange device to be used as a heat source for preheating the hot air for cooling and drying, and the rest of the circulating medium after temperature reduction is sent back to the exhaust steam heat exchange device again, so that the heat energy is absorbed circularly, and the circulating continuous operation of heat energy recycling is realized. Can be widely applied to solid waste treatment, pharmacy, food industry and the like. The material drying system comprises two sections of processing lines of steam drying and hot air drying, high-temperature steam containing a large amount of impurities generated by the two sections of processing lines are respectively processed, exhaust steam heat energy in the steam drying system is recycled by a heat pump and is introduced into the hot air drying system to preheat dry and cooled hot air, so that the hot air is ensured to be recycled, the heat energy consumed by hot air circulation is greatly reduced, the energy consumption loss of the whole drying system is reduced, and the utilization rate of the heat energy and the circulating heat efficiency are improved.
The circulation medium of the invention is provided with an independent circulation system, and exchanges heat with the exhaust steam in the steam drying system and the hot air in the hot air drying system in a non-contact way, so that impurities cannot be fused in the circulation medium, the blockage of an exhaust steam heat regenerator and a hot air preheater is effectively avoided, the stability and the continuity of the operation of the system are improved, the heat energy utilization rate is also effectively improved, and the energy consumption of sludge drying is greatly reduced.
The heat energy utilization integrated device, the material drying system and the drying method of the invention are further explained with reference to the attached drawings.
Drawings
FIG. 1 is a schematic structural diagram of a heat energy utilization integrated device according to the present invention;
fig. 2 is a schematic view of a connection structure of the material drying system.
Reference numerals:
1-a shell; 11-sealing the partition plate; 12-a first in-line cleaning device; 13-a second online cleaning device; 2-a dead steam heat exchange device; 3-a hot air heat exchange device; 4-a heat pump; 41-low dielectric inlet pipe; 42-low dielectric return pipe; 43-high-head medium pipe; 44-a liquid return pipe; 5-steam drier; 51-a dead steam condenser; 6-a hot air drier; 61-hot air condenser; 7-a hot air reheater; 81-first branch; 82-second merging pipe; 9-wet material storage.
Detailed Description
As shown in fig. 1, the heat energy utilization integration device of the invention comprises a shell 1, the shell 1 is divided into three independent cavities which are horizontally arranged side by side through a partition plate 11, an exhaust steam heat regeneration module, a heat energy lifting and converting module and a hot air heat absorption module are respectively arranged in the three cavities, the exhaust steam heat regeneration module and the hot air heat absorption module are communicated through the heat energy lifting and converting module, and a circulating medium independently circulates between the exhaust steam heat regeneration module and the hot air heat absorption module through the heat energy lifting and converting module.
The exhaust steam heat regeneration module comprises an exhaust steam heat exchange device 2 positioned in the cavity, the exhaust steam heat exchange device 2 is a non-contact indirect heat exchange device, an exhaust steam outlet and an exhaust steam inlet of the exhaust steam heat exchange device 2 are respectively positioned at the upper end and the lower end of the shell 1, an inlet and an outlet of a circulating medium are positioned on a partition plate 11 between the exhaust steam heat regeneration module and the heat energy lifting conversion module, and the circulating medium inlet and the outlet comprise a first inlet above and a first outlet below and are used for being connected with the heat energy lifting conversion module to convey the circulating medium.
The top of the exhaust steam heat exchange device 2 is provided with a first online cleaning device 12 for washing an exhaust steam circulation pipeline.
The first online cleaning device 12 comprises a high-pressure nozzle arranged in an exhaust steam circulation pipeline and is arranged close to an exhaust steam outlet, the high-pressure nozzle is connected with a cleaning water source through a hose, an electromagnetic valve is connected in series on the hose, a signal output end of the electromagnetic valve is electrically connected with a signal input end of an electric control system, the electric control system controls the opening and closing degree of the electromagnetic valve, cleaning water is sprayed into the exhaust steam circulation pipeline through the high-pressure nozzle, the inner wall of the pipeline is washed online in real time, washing water falls freely and is converged with condensate water of the exhaust steam to discharge the exhaust steam heat exchange device 2, the first online cleaning device can be used online when the device works normally, impurities in the exhaust steam can be effectively prevented from being accumulated on the pipe wall to cause blockage, and the operation stability of the device is prevented from being influenced.
The hot air heat absorption module comprises a hot air heat exchange device 3 positioned in the cavity, the hot air heat exchange device 3 is a non-contact indirect heat exchange device, a hot air inlet and a hot air outlet of the hot air heat exchange device 3 are respectively positioned at the upper end and the lower end of the shell 1, an inlet and an outlet of a circulating medium are positioned on a sealing partition plate 11 between the hot air heat absorption module and the heat energy lifting conversion module, and the hot air heat absorption module comprises a second inlet at the lower part and a second outlet at the upper part and is used for being connected with the heat energy lifting conversion module to convey the circulating medium; the side wall of the shell 1 opposite to the partition board 11 is also provided with a supplementary medium inlet and a supplementary medium outlet for supplementing high-temperature circulating medium, which is used as supplementary heat for heating the dry hot air passing through the hot air heat exchange device 3, and simultaneously can discharge redundant circulating medium out of the heat energy utilization integrated device.
The top of the hot air heat exchange device 3 is provided with a second online cleaning device 13 for washing a hot air circulation pipeline. The second in-line cleaning apparatus 13 has the same structure as the first in-line cleaning apparatus 12.
The circulation medium in the exhaust steam heat exchange device 2 and the circulation medium in the hot air heat exchange device 3 are the same, and independently circulate in the whole integrated device to absorb and release heat, and the circulation medium can be all fluids with fluidity and heat storage capacity and circularly circulate between the exhaust steam heat exchange device 2 and the hot air heat absorption module through the heat pump 4.
The heat energy lifting and converting module is positioned between the two partition boards 11 and comprises a heat pump 4, the heat pump 4 is a temperature-increasing heat pump 4, a low-temperature outlet of a circulating medium of the heat pump 4 is connected with a first inlet of the exhaust steam heat exchange device 2 through a low-dielectric inlet pipe 41, a first outlet of the exhaust steam heat exchange device 2 is communicated with a low-temperature inlet of the circulating medium of the heat pump 4 through a low-dielectric return pipe 42, a high-temperature outlet of the circulating medium of the heat pump 4 is communicated with a second inlet of the hot air heat exchange device 3 through a high-dielectric inlet pipe 43, and a second outlet is communicated with the low-dielectric inlet pipe 41 through a liquid return pipe 44, so that the circulating medium subjected to heat exchange and temperature reduction in the hot air heat exchange device 3 is combined and sent back to the exhaust steam heat exchange device 2 to absorb heat; the low dielectric inlet pipe 41, the low dielectric return pipe 42, the high dielectric inlet pipe 43 and the liquid return pipe 44 are respectively connected in series with a booster pump.
In the commonly used warming heat pump 4 in the field, the low-temperature residual heat water, the high-temperature heat source water and the cooling medium three-way system are mutually independent and do not interfere with each other. In the present application, the low-temperature waste heat water and the high-temperature heat source water are the same medium and are communicated in the circulation system of the heat pump 4, that is, the circulation medium in the present invention. Through reasonable heat exchange temperature difference control in the exhaust steam heat exchange device 2 and the hot air heat exchange device 3, the temperature of the heat source water return water of the heat pump 4 is reduced to be the same as the temperature of the residual heat water return water, the energy corresponding to the fact that the heat source water return water of the conventional temperature-increasing heat pump 4 is higher than the residual heat water return water temperature is fully utilized, and the overall energy recovery rate of the exhaust steam heat exchange device 2 is improved. The modified heat pump 4 can be used, the existing heat pump 4 can also be innovated in use, and by taking the existing heat pump 4 as an example, the outlet of the residual heat water and the inlet of the heat source water are communicated through a pipeline for use, so that the functions and functions of the invention can be realized.
In the invention, the low-temperature waste heat water and the high-temperature heat source water are communicated and integrated into the circulating medium, and compared with the conventional use method of the temperature-increasing heat pump 4, the heat energy utilization rate and the conversion efficiency are higher. In the conventional method using the heat pump 4, the temperature of the liquid return pipe 44 is not less than that of the low-order liquid return pipe, that is, the temperature difference between the high-order liquid return pipe 43 and the liquid return pipe 44 is less than that between the two pipes in the present invention, in the system of the present invention, a greater temperature reduction in the hot air heat exchange device 3 can be realized, and the heat energy utilization rate is higher. In addition, the partial temperature rise of the return pipe 44 to the low-stage return pipe is realized by the energy conversion of the exhaust steam heat exchange device 2, and the conversion efficiency is far higher than that of the conventional heat pump 4.
As shown in fig. 2, the material drying system of the present invention further includes a steam drying system and a hot air drying system, the steam drying system includes at least one steam dryer 5 and a steam exhaust condenser 51, a feed inlet of the steam dryer 5 is communicated with the wet material storage 9, and a steam outlet is connected in series with the heat energy utilization integration device and the steam exhaust condenser 51 in sequence, the steam dryer 5 used in this embodiment is a rotary disc type non-contact dryer.
The material drying system can be widely applied to solid waste treatment, pharmacy, food industry and the like. In this embodiment, a drying system and a drying method for wet sludge are described as an example.
A large amount of high-temperature steam containing impurities and evaporated from wet sludge is cooled in a heat energy utilization integrated device through heat exchange; the steam outlet is communicated with a steam exhaust inlet of a steam exhaust heat exchange device 2 in the heat energy utilization integrated device through a pipeline, the cooled steam exhaust enters a steam exhaust condenser 51 again, a steam exhaust outlet of the heat energy utilization integrated device is connected with the steam exhaust condenser 51 through a pipeline and exchanges heat with a cooling medium introduced into the steam exhaust condenser 51 for cooling, and the condensed steam exhaust can be sent to a boiler for incineration treatment. The steam drying machine 5 can be combined in parallel or in series, and the introduced high-temperature steam can be used as saturated steam of a power plant.
The hot air drying system comprises at least one hot air drying machine 6, a hot air condenser 61 and a hot air reheater 7, a feed inlet of the hot air drying machine 6 is communicated with a wet material storage bin 9, an air outlet is sequentially connected with the hot air condenser 61, the heat energy utilization integrated device and the hot air reheater 7 in series through pipelines, an air outlet of the hot air reheater 7 is communicated with a hot air inlet of the hot air drying machine 6, and hot air is dried and circulated and then returns to the hot air drying machine 6 for recycling.
The air outlet of the hot air drier 6 is communicated with the heat source inlet of the hot air condenser 61, and the hot air condenser 61 exchanges heat with a cooling medium to reduce the temperature so as to remove a large amount of moisture evaporated from wet sludge; the heat source outlet of the hot air condenser 61 is communicated with the hot air inlet of the hot air heat exchange device 3, the cooled hot air enters the hot air heat exchange device 3 for preheating and warming, the hot air outlet of the hot air heat exchange device 3 is communicated with the air inlet of the hot air reheater 7 for heat exchange and warming with high-temperature steam in the hot air reheater 7, and the hot air is changed into high-temperature hot air and then enters the hot air drier 6 again for cyclic utilization.
The hydrophobic outlet of the steam drier 5 is communicated with the hot air inlet of the heat energy utilization integrated device through a first branch pipe 81, and hydrophobic water generated after heat exchange of high-temperature steam in the steam drier 5 is sent to a hot air heat absorption module to be used as a heat source for reutilization.
The drain outlet of the hot air reheater 7 is communicated with the hot air inlet of the heat energy utilization integrated device through a second parallel pipe 82, and drain water generated after heat exchange of high-temperature steam in the hot air reheater 7 can be sent to a hot air heat absorption module to be used as a heat source for reutilization.
In addition, the feed inlet of the hot air drier 6 can be directly communicated with the discharge outlet of the steam drier 5, and the semi-dry sludge after steam drying can be directly treated for further sludge drying.
Taking the drying system of wet sludge as an example, the drying method of the material drying system of the invention is explained, which comprises the following steps:
step one, the wet material enters a steam drier 5 to be dried by distillation, high-temperature steam containing impurities is condensed after waste heat recovery and cooling, and the recovered waste heat enters a heat energy utilization integration device to be recycled;
1.1, conveying the wet sludge material with the water content of 60-80% into a steam drier 5, heating and evaporating by high-temperature steam, evaporating to dryness until the water content is 30-50%, discharging out of the steam drier 5, and evaporating to obtain dried dead steam containing impurities from the material at about 100 ℃;
1.2, the dried exhaust steam is subjected to heat energy recovery in a heat energy utilization integrated device, and is subjected to heat exchange with a circulating medium in an exhaust steam heat exchange device 2 to reduce the temperature, and the waste heat recovered in the exhaust steam heat exchange device 2 is sent to a heat energy lifting conversion module for recycling;
in the exhaust steam heat exchange device 2, dried exhaust steam at about 100 ℃ exchanges heat with a circulating medium at about 60 ℃, and the circulating medium is heated to about 75 ℃ and then is sent to a heat pump 4 of a heat energy lifting and converting module; in the heat pump 4, about 25% of the circulating medium is converted into a circulating medium with a high temperature of about 95 ℃, the circulating medium is sent into the hot air heat exchange device 3 to be used as a heat source to preheat the dry and cooled hot air, and the residual circulating medium with a low temperature of about 75% is sent back to the exhaust steam heat exchange device 2 to be used as a circulating medium to continue heat absorption and circulation.
1.3, cooling the dried exhaust steam with the heat energy recovered to about 50 ℃ through an exhaust steam condenser 51, discharging the exhaust steam out of the steam drying system, and sending the exhaust steam to a boiler for incineration treatment.
Secondly, the wet material enters a hot air drier 6 for drying, hot air containing impurities and water vapor is preheated and heated again after being cooled and dewatered, and then the wet material is sent into the hot air drier 6 for circularly drying the sludge material;
2.1, heating and drying the sludge material by high-temperature hot air, discharging the dried sludge out of a hot air drier 6, and evaporating hot air at about 60 ℃ to obtain a large amount of impurities and water vapor;
the sludge material entering the hot air drier 6 can be wet sludge material with the water content of 60-80%, or primary dried sludge with the water content of 30-50% which is dried by the steam drier 5 in the first step, is contacted with hot air at about 110 ℃ in the hot air drier 6, is heated and evaporated, and is respectively dried to be dry until the water content is 40-50% and the water content is 5-20%, and then is discharged out of the hot air drier 6.
2.2, the hot-blast cooling that contains impurity and steam that evaporates in hot air drying machine 6 is discharged after the condensation of a large amount of steam that contain in the hot-blast condenser 61, and a large amount of impurity can be carried to the exhaust comdenstion water, can reduce the impurity content in the hot-blast that gets into heat utilization integrated device in a large number, avoids system's valve or pipeline to block up.
2.3, the hot air after cooling and drying enters a hot air heat exchange device 3, exchanges heat with a high-temperature circulating medium to heat up, and is preheated by utilizing the heat energy processed by the heat energy lifting and converting module;
in step 1.2, the circulating medium heated to about 95 ℃ by the heat pump 4 is sent to a hot air heat absorption module to exchange heat with dry and cooled hot air, and the circulating medium cooled to about 60 ℃ is sent back to the exhaust steam heat exchange device 2 to absorb heat again for recycling.
The water drained at about 60 ℃ generated by the steam drier 5 in the first step can also be directly sent to a hot air heat absorption module as a heat source for waste heat utilization.
2.4, the preheated hot air at the temperature of about 80-90 ℃ exchanges heat with high-temperature steam in a hot air reheater 7, and the hot air is heated to about 110 ℃ and then enters a hot air drier 6 for recycling;
high-temperature steam of about 200 ℃ led from a power plant is introduced into the hot air reheater 7, and hot air is heated to about 110 ℃ and sent to the hot air drier 6 for recycling.
The drained water at about 60 ℃ generated by the hot air reheater 7 can also be directly sent to a hot air heat absorption module as a heat source for waste heat utilization.
The system shown in fig. 2 only lists parameter values in a typical combination mode, and cannot be used as a data standard for identifying the process of the system; all data ranges within 20% of the temperature values described in the exemplary system are within the process achievable range.
The matching process can meet the drying requirements of 1 output 200t/d hot air sludge drying machine (the sludge water content is reduced from 60% to 40%) by completely recycling the waste heat of 1 output 100t/d steam sludge drying machine (the sludge water content is reduced from 80% to 40%) and only adding 1.8t/h of new steam. The consumption of unit dehydration steam of the process is about 1.25 t/t; compared with the traditional steam drying, the method saves at least 50% of steam consumption and about 65% of energy consumption; therefore, compared with the traditional sludge drying process, the multi-section type heat energy gradient recycling system saves energy by at least over 50 percent; in addition, compared with the existing two-stage material drying system, the process can realize long-time stable and continuous operation because the process is provided with an independent circulating heat exchange system. The above data merely exemplify an energy efficiency analysis based on this particular system.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. Heat energy utilization integrated device, including casing (1), its characterized in that: the shell (1) is internally divided into three independent cavities which are horizontally arranged side by side, an exhaust steam heat regeneration module, a heat energy lifting and converting module and a hot air heat absorption module are respectively arranged in the cavities, and a circulating medium independently circulates between the exhaust steam heat regeneration module and the hot air heat absorption module through the heat energy lifting and converting module;
the exhaust steam heat regeneration module comprises an exhaust steam heat exchange device (2) positioned in the cavity, the hot air heat absorption module comprises a hot air heat exchange device (3) positioned in the cavity, the heat energy lifting conversion module comprises a heat pump (4), a low-temperature outlet of a circulating medium of the heat pump (4) is connected with a first inlet of a circulating medium in the exhaust steam heat exchange device (2) through a low-dielectric inlet pipe (41), a first outlet of the circulating medium is communicated with a low-temperature inlet of the circulating medium of the heat pump (4) through a low-dielectric return pipe (42), a high-temperature outlet of the circulating medium of the heat pump (4) is communicated with a second inlet of the circulating medium in the hot air heat exchange device (3) through a high-dielectric inlet pipe (43), a second outlet is communicated with the low-dielectric inlet pipe (41) through a liquid return pipe (44), and only the circulating medium circulates in the heat pump; the low dielectric inlet pipe (41), the low dielectric return pipe (42), the high dielectric inlet pipe (43) and the liquid return pipe (44) are respectively connected with a booster pump in series.
2. The integrated thermal energy utilization device of claim 1, wherein: the top of the exhaust steam heat exchange device (2) is provided with a first online cleaning device (12) for washing an exhaust steam circulation pipeline, and the top of the hot air heat exchange device (3) is provided with a second online cleaning device (13) for washing a hot air circulation pipeline.
3. The integrated thermal energy utilization device of claim 2, wherein: the first online cleaning device (12) comprises a high-pressure nozzle arranged in an exhaust steam circulation pipeline and arranged close to an exhaust steam outlet, the high-pressure nozzle is connected with a cleaning water source through a hose, an electromagnetic valve is connected on the hose in series, and the signal output end of the electromagnetic valve is electrically connected with the signal input end of an electric control system.
4. A material drying system using the integrated heat energy utilization device of any one of claims 1 to 3, wherein: also comprises a steam drying system and a hot air drying system,
the steam drying system comprises at least one steam drying machine (5) and a dead steam condenser (51), a steam outlet of the steam drying machine (5) is sequentially connected in series with a dead steam heat exchange device (2) and the dead steam condenser (51) in the heat energy utilization integrated device,
the hot air drying system comprises at least one hot air drying machine (6), a hot air condenser (61) and a hot air reheater (7), wherein an air outlet of the hot air drying machine (6) is sequentially connected with the hot air condenser (61), a hot air heat exchange device (3) and the hot air reheater (7) in the heat energy utilization integrated device in series through pipelines, and an air outlet of the hot air reheater (7) is communicated with a hot air inlet of the hot air drying machine (6).
5. The material drying system of claim 4, wherein: a steam outlet of the steam drier (5) is communicated with a steam exhaust inlet of the steam exhaust heat exchange device (2) through a pipeline, and a steam exhaust outlet is connected with a steam exhaust condenser (51) through a pipeline; the air outlet of the hot air drier (6) is communicated with the heat source inlet of the hot air condenser (61), the heat source outlet of the hot air condenser (61) is communicated with the hot air inlet of the hot air heat exchange device (3), and the hot air outlet of the hot air heat exchange device (3) is communicated with the air inlet of the hot air reheater (7).
6. The material drying system of claim 4, wherein: and a hydrophobic outlet of the steam drier (5) is communicated with a hot air inlet of the hot air heat exchange device (3) through a first branch pipe (81).
7. The material drying system of claim 4, wherein: and a water drainage outlet of the hot air reheater (7) is communicated with a hot air inlet of the hot air heat exchange device (3) through a second parallel pipe (82).
8. The drying method of the material drying system of claim 4, wherein: the method comprises the following steps:
step one, the wet material enters a steam drier (5) to be dried by distillation, high-temperature steam containing impurities is condensed after being subjected to waste heat recovery and cooling, and the recovered waste heat enters a heat energy utilization integrated device to be subjected to heat energy reutilization;
and secondly, drying the wet material in a hot air drier (6), cooling and dehydrating hot air containing impurities and water vapor, preheating and heating the hot air, then sending the hot air into the hot air drier (6) to circularly dry the wet material, and heating the wet material by utilizing heat energy recovered by a heat pump (4) in the integrated device in the preheating process.
9. The drying method according to claim 8, wherein: the first step specifically comprises the following steps:
1.1, heating and evaporating the wet material by high-temperature steam, and discharging the evaporated wet material out of a steam drier (5);
1.2, the dried exhaust steam is subjected to heat energy recovery in a heat energy utilization integrated device, and is subjected to heat exchange with a circulating medium in an exhaust steam heat exchange device (2) for cooling, the circulating medium recovers waste heat from the exhaust steam heat exchange device (2) and then enters a heat pump (4), the heat pump (4) heats part of the circulating medium and then sends the heated part of the circulating medium to a hot air heat absorption module for recycling, and the rest of the circulating medium is cooled and then is sent back to the exhaust steam heat exchange device (2) for circulating heat absorption;
and 1.3, cooling the dried exhaust steam with the heat energy recovered, and then discharging the cooled exhaust steam out of the steam drying system for subsequent treatment.
10. The drying method according to claim 8, wherein: the second step specifically comprises the following steps:
2.1, heating and drying the wet material by high-temperature hot air, and discharging the dried material out of a hot air drier (6);
2.2, cooling the evaporated hot air containing impurities and water vapor to remove a large amount of water vapor and impurities in the hot air;
2.3, the hot air after cooling and drying enters a hot air heat exchange device (3) and is preheated by utilizing the heat energy treated by the heat energy lifting and converting module;
2.4, the preheated hot air exchanges heat with high-temperature steam in a hot air reheater (7), and enters a hot air drier (6) after being heated for recycling.
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