CN115654982B - Industrial drying and heating system - Google Patents
Industrial drying and heating system Download PDFInfo
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- CN115654982B CN115654982B CN202211280225.8A CN202211280225A CN115654982B CN 115654982 B CN115654982 B CN 115654982B CN 202211280225 A CN202211280225 A CN 202211280225A CN 115654982 B CN115654982 B CN 115654982B
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- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
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Abstract
The application relates to the technical field of industrial drying, and particularly provides an industrial drying heating system which comprises a blower, a dryer, a dust remover, an induced draft fan, a waste heat recovery heat exchanger, a cold water tank, a hot water tank, a motor, a compressor, a heat absorber, an expander, a high-temperature heat exchanger, a low-temperature heat storage tank, a high-temperature heat storage tank and an air heater. The waste heat recovery heat exchanger operates throughout the day, and waste heat is recovered and stored in the hot water tank. The motor only operates in the valley period every day, and the valley is utilized to drive the compressor, absorb the waste heat stored in the hot water tank, prepare high temperature heat and store in the high temperature heat storage tank. The air heater operates throughout the day, and the air is heated to the temperature required by drying by utilizing the high-temperature heat storage medium in the high-temperature heat storage tank. The application greatly reduces the cost of electric heating adopted by industrial drying, and ensures that the electric heating adopted by industrial drying has lower energy cost than that of coal heating, thereby having great application prospect.
Description
Technical Field
The application relates to the technical field of industrial drying, in particular to an industrial drying heating system.
Background
In the chemical, food, pharmaceutical, textile, and other industries, it is often desirable to remove moisture from wet solid products for storage, transportation, and use. The process of removing moisture is called drying, and the general mode is to heat the wet material by adopting hot air to remove the moisture in the material. The drying is to dehumidify by using the heat energy of the hot air, so that the energy consumption is high. At present, a coal-fired furnace, a natural gas furnace or an electric furnace is generally adopted for heating to generate hot air meeting the requirements of a drying process.
Coal-fired furnaces, while relatively low in energy costs, are subject to environmental pressures to shut down. The natural gas furnace has relatively smaller environmental protection pressure, but has higher natural gas cost, thereby greatly increasing the energy consumption cost of the drying process. The electric furnace has no environmental protection pressure, but the energy consumption cost is highest in three modes due to higher electricity price.
In order to solve the environmental protection and cost problems of industrial drying and heating, the application provides a novel industrial drying and heating system. And the heat pump type high-temperature heater is used for heating in the valley period and simultaneously storing energy, and the energy storage heater is used for heating in the non-valley period. The heat pump type high-temperature heater can recover waste heat in the process when in operation, so that the electricity consumption is reduced. Meanwhile, as valley electricity is used, the electricity price is extremely low, so that the electricity cost is greatly reduced. The industrial drying and heating system provided by the application can realize safe, environment-friendly and zero emission, and can also ensure that the energy consumption cost of drying and heating is obviously lower than that of a coal-fired furnace, thereby having great application prospect.
Disclosure of Invention
Aiming at the defects, a novel industrial drying and heating system is provided, and the problems of environmental protection and cost of industrial drying and heating are solved.
In order to achieve the above purpose, the application provides an industrial drying heating system, which comprises two parts of an industrial drying conventional process system and a heating system; the industrial drying conventional process system comprises a blower, a dryer, a dust remover and an induced draft fan;
the heating system comprises a waste heat recovery subsystem, a heat pump type high-temperature heating subsystem and a heat storage and exchange subsystem; the waste heat recovery subsystem comprises a waste heat recovery heat exchanger, a cold water tank and a hot water tank; the heat pump type high-temperature heating subsystem comprises a motor, a compressor, a heat absorber, an expander and a high-temperature heat exchanger; the heat storage and exchange subsystem comprises a low-temperature heat storage tank, a high-temperature heat storage tank and an air heater.
According to the industrial drying and heating system, in the conventional industrial drying process system, the air side of the air blower, the air side of the air heater, the dryer, the dust remover and the induced draft fan are sequentially communicated with each other to form a material circulation channel.
According to the industrial drying and heating system, in the waste heat recovery subsystem, the hot side of the waste heat recovery heat exchanger is respectively communicated with the dust remover and the induced draft fan, and the cold side of the waste heat recovery heat exchanger is respectively communicated with the cold water tank and the hot water tank;
in the heat pump type high-temperature heating subsystem, the motor takes electricity from a power grid to drive the compressor to run; the compressor outlet is communicated with the hot side inlet of the high-temperature heat exchanger, the hot side outlet of the high-temperature heat exchanger is communicated with the inlet of the expander, the outlet of the expander is communicated with the cold side inlet of the heat absorber, and the cold side outlet of the heat absorber is communicated with the compressor inlet to form a closed loop; the hot side inlet and the outlet of the heat absorber are respectively communicated with the hot water tank and the cold water tank, and the cold side inlet and the outlet of the high-temperature heat exchanger are respectively communicated with the low-temperature heat storage tank and the high-temperature heat storage tank.
In the heat storage and exchange subsystem, the high-temperature heat storage tank is communicated with the hot side inlet of the air heater, and the hot side outlet of the air heater is communicated with the low-temperature heat storage tank.
According to the industrial drying heating system, the operation mode of the heating system is as follows: the waste heat recovery subsystem operates all the day, heats cold water of the cold water tank through the waste heat recovery heat exchanger, and stores the cold water into the hot water tank;
the heat pump type high-temperature heating subsystem only operates in a valley electricity period every day, the valley electricity is utilized to drive the compressor, waste heat stored in the hot water tank is absorbed, and a heat storage medium in the low-temperature heat storage tank is heated to a high temperature and stored in the high-temperature heat storage tank;
the heat storage and exchange subsystem operates all the day, the high-temperature heat storage medium in the high-temperature heat storage tank is utilized to heat the air to the temperature required by drying, and the low-temperature heat storage medium subjected to heat exchange is discharged into the low-temperature heat storage tank for storage.
According to the industrial drying and heating system, working media of the high-temperature heat storage tank and the low-temperature heat storage tank are liquid heat storage media or solid heat storage media; the liquid heat storage medium is any one of molten salt, heat conducting oil, paraffin and pressurized water, and the solid heat storage medium is solid particles.
According to the industrial drying and heating system of the application, the working medium of the compressor is a high temperature resistant gas medium including but not limited to air, carbon dioxide, nitrogen and argon.
According to the industrial drying and heating system provided by the application, the four heat storage devices, namely the cold water tank, the hot water tank, the low-temperature heat storage tank and the high-temperature heat storage tank, can be omitted, and the industrial drying and heating system does not need heat storage operation.
According to the industrial drying and heating system, the industrial drying and heating system can be used for other drying and heating links besides air heating.
The beneficial technical effects of the application are as follows:
and the electric heating is utilized to realize zero emission of industrial drying. On one hand, the electric power consumption is reduced by recovering the waste heat discharged in the drying process, and on the other hand, the electricity price is reduced by heating and heat storage in the valley period. The two aspects cooperate with each other, so that the cost of electric heating is greatly reduced, and the energy consumption cost of the electric heating adopted in industrial drying is lower than that of the coal heating. The application solves the environmental protection and cost problems of industrial drying and heating, can realize the safe and environmental protection zero emission of drying and heating, and can also lead the drying and heating to have the lowest energy consumption cost.
Drawings
FIG. 1 is a flow chart of an industrial drying and heating system of the present application.
In the figure, 1 blower, 2 dryer, 3 dust remover, 4 draught fan, 5 waste heat recovery heat exchanger, 6 cold water tank, 7 hot water tank, 8 motor, 9 compressor, 10 absorber, 11 expander, 12 high temperature heat exchanger, 13 low temperature heat storage tank, 14 high temperature heat storage tank, 15, air heater.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the accompanying drawings and examples, it being understood that the specific examples described herein are for illustration only and are not intended to limit the present application.
As shown in fig. 1, the industrial drying heating system comprises two major parts of an industrial drying conventional process system and a heating system. The conventional industrial drying process system comprises a blower 1, a dryer 2, a dust remover 3 and an induced draft fan 4. The heating system comprises a waste heat recovery subsystem, a heat pump type high-temperature heating subsystem and a heat storage and exchange subsystem. The waste heat recovery subsystem comprises a waste heat recovery heat exchanger 5, a cold water tank 6 and a hot water tank 7; the heat pump type high-temperature heating subsystem comprises a motor 8, a compressor 9, a heat absorber 10, an expander 11 and a high-temperature heat exchanger 12; chu Huanre subsystem comprises a low temperature heat storage tank 13, a high temperature heat storage tank 14, an air heater 15.
In the conventional industrial drying process system, an air blower 1, an air side of an air heater 15, a dryer 2, a dust remover 3 and an induced draft fan 4 are sequentially communicated with each other to form a material circulation channel. In the waste heat recovery subsystem, the hot side of the waste heat recovery heat exchanger 5 is respectively communicated with the dust remover 3 and the induced draft fan 4, and the cold side of the waste heat recovery heat exchanger 5 is respectively communicated with the cold water tank 6 and the hot water tank 7. In the heat pump type high-temperature heating subsystem, the motor 8 takes electricity from a power grid and drives the compressor 9 to operate. The outlet of the compressor 9 is communicated with the hot side inlet of the high-temperature heat exchanger 12, the hot side outlet of the high-temperature heat exchanger 12 is communicated with the inlet of the expander 11, the outlet of the expander 11 is communicated with the cold side inlet of the heat absorber 10, and the cold side outlet of the heat absorber 10 is communicated with the inlet of the compressor 9 to form a closed loop. The hot side inlet and outlet of the heat absorber 10 are respectively communicated with the hot water tank 7 and the cold water tank 6, and the cold side inlet and outlet of the high temperature heat exchanger 12 are respectively communicated with the low temperature heat storage tank 13 and the high temperature heat storage tank 14. In the Chu Huanre subsystem, the high-temperature heat storage tank 14 is communicated with a hot side inlet of the air heater 15, and a hot side outlet of the air heater 15 is communicated with the low-temperature heat storage tank 13.
The operation mode of the heating system is as follows: the waste heat recovery subsystem operates throughout the day, and cold water in the cold water tank 6 is heated up by the waste heat recovery heat exchanger 5 and stored in the hot water tank 7. The heat pump type high temperature heating subsystem operates only during the valley electricity of each day, and the compressor 9 is driven by the valley electricity to absorb the waste heat stored in the hot water tank 7, heat the heat storage medium in the low temperature heat storage tank 13 to a high temperature, and store the heat storage medium in the high temperature heat storage tank 14. Chu Huanre subsystem operates all the day, and the high-temperature heat storage medium in the high-temperature heat storage tank 14 is used for heating the air to the temperature required by drying, and the low-temperature heat storage medium subjected to heat exchange is discharged into the low-temperature heat storage tank 13 for storage. The operation is repeated and repeated every day.
Further, the working media of the high-temperature heat storage tank 14 and the low-temperature heat storage tank 13 are liquid heat storage media such as various molten salts, heat conducting oil, paraffin, pressurized water and the like or solid heat storage media such as solid particles and the like.
Further, the working medium of the compressor 9 is a high temperature resistant gas medium such as air, carbon dioxide, nitrogen, argon, etc.
Further, the dust collector 3 includes a collecting hood at a lower portion. The lower part of the collecting cover is provided with a plurality of annular air inlet channels surrounding the center of the collecting cover, the widths of the air inlet channels are different, and the widths of the air inlet channels gradually increase along the direction from the center of the collecting cover to the edge. According to the application, through the arrangement of the width of the air inlet channel, the constant-speed collection of air in the whole collection area can be realized by adopting the design of the constant-pressure principle of the collection cover, the collection precision is improved, and the operation cost is reduced.
Preferably, the width of the air inlet channel increases progressively more and more in the direction of the centre towards the sides of the collecting hood. The design of the variation amplitude is also a structure optimized through a large number of experiments and numerical simulation, so that the constant-speed collection technical effect can be further realized, and the requirements of the application are more met.
The width of the air inlet channel is changed according to the following rule:
the diameter of the collecting cover at the lower part of which the channel is arranged is 2R, and the width of the air inlet channel at the central position is W In (a) The W law for the distance r from the center position is as follows: w=b×w In (a) +c*W In (a) *（（R-r）/R） a Wherein a, b, c are coefficients, satisfying the following requirements:
1.083<a<1.102，0.993<b+c<1.011，0.495<b<0.626。
as R/R increases, a gradually increases.
1.094<a<1.101，b+c=1，0.565<b<0.578。
The optimized formula is obtained through a large number of experiments and numerical simulation, so that the gas can reach optimized distribution, the constant-speed collection technical effect can be optimally realized, and the requirements of the application are more met.
The dust remover is internally provided with a charging device, a spraying device and a liquid drop collecting device, the spraying device is arranged on the upper part of the dust remover, the charging device is arranged in the middle of the dust remover, and the collecting device is arranged on the lower part of the dust remover. The dust remover has the functions of charge and spray treatment, gas is subjected to charge and spray treatment through the collecting cover, and fine water mist is combined with low-power charge to treat, so that the high-efficiency removal of pollutants such as dust/mist in the gas can be realized. The reasonable collocation of the two-stage treatment steps avoids the influence of particles on the purification effect, so that the purification effect is optimal. Along the flow direction of the air in the dust remover, the voltage of the charging device gradually rises. Because the amount of pollutants in the gas gradually decreases along with the flow of the gas, the voltage gradually increases through the discharging device, so that the decontamination capability in the whole gas flow direction is basically the same, the countercurrent heat exchange effect similar to that of a heat exchanger is formed, and the purification capability is integrally improved through the distribution of the voltage under the condition that the overall voltage is unchanged.
Further preferably, the voltage of the charging device is gradually increased in a gradually increasing extent along the flow direction of the gas in the dust remover. The voltage amplitude variation is also a structure optimized through a large number of experiments and numerical simulation, the constant-speed collection technical effect can be further realized, and under the condition that the overall voltage is unchanged, the purification capability can be further integrally improved through the distribution of the voltage.
Furthermore, the industrial drying and heating system can also cancel the heat storage devices such as the cold water tank 6, the hot water tank 7, the low-temperature heat storage tank 13, the high-temperature heat storage tank 14 and the like, and does not have heat storage operation.
Further, the industrial drying and heating system can be used for other drying and heating links besides air heating.
Of course, the present application is capable of other various embodiments and its several details are capable of modification and variation in light of the present application, as will be apparent to those skilled in the art, without departing from the spirit and scope of the application as defined in the appended claims.
Claims (3)
1. The industrial drying and heating system is characterized by comprising two parts of an industrial drying conventional process system and a heating system; the industrial drying conventional process system comprises a blower, a dryer, a dust remover and an induced draft fan;
the heating system comprises a waste heat recovery subsystem, a heat pump type high-temperature heating subsystem and a heat storage and exchange subsystem; the waste heat recovery subsystem comprises a waste heat recovery heat exchanger, a cold water tank and a hot water tank; the heat pump type high-temperature heating subsystem comprises a motor, a compressor, a heat absorber, an expander and a high-temperature heat exchanger; the heat storage and exchange subsystem comprises a low-temperature heat storage tank, a high-temperature heat storage tank and an air heater;
in the conventional industrial drying process system, the air side of the air blower, the air side of the air heater, the dryer, the dust remover and the induced draft fan are sequentially communicated with one another to form a material circulation channel; the dust remover comprises a collecting cover positioned at the lower part; the lower part of the collecting cover is provided with a plurality of annular air inlet channels which surround the center of the collecting cover, the widths of the air inlet channels are different, and the widths of the air inlet channels gradually increase along the direction from the center of the collecting cover to the edge;
in the waste heat recovery subsystem, the hot side of the waste heat recovery heat exchanger is respectively communicated with the dust remover and the induced draft fan, and the cold side of the waste heat recovery heat exchanger is respectively communicated with the cold water tank and the hot water tank;
in the heat pump type high-temperature heating subsystem, the motor takes electricity from a power grid to drive the compressor to run; the compressor outlet is communicated with the hot side inlet of the high-temperature heat exchanger, the hot side outlet of the high-temperature heat exchanger is communicated with the inlet of the expander, the outlet of the expander is communicated with the cold side inlet of the heat absorber, and the cold side outlet of the heat absorber is communicated with the compressor inlet to form a closed loop; the hot side inlet and the outlet of the heat absorber are respectively communicated with the hot water tank and the cold water tank, and the cold side inlet and the outlet of the high-temperature heat exchanger are respectively communicated with the low-temperature heat storage tank and the high-temperature heat storage tank;
in the heat storage and exchange subsystem, the high-temperature heat storage tank is communicated with the hot side inlet of the air heater, and the hot side outlet of the air heater is communicated with the low-temperature heat storage tank;
the operation mode of the heating system is as follows: the waste heat recovery subsystem operates all the day, heats cold water of the cold water tank through the waste heat recovery heat exchanger, and stores the cold water into the hot water tank;
the heat pump type high-temperature heating subsystem only operates in a valley electricity period every day, the valley electricity is utilized to drive the compressor, waste heat stored in the hot water tank is absorbed, and a heat storage medium in the low-temperature heat storage tank is heated to a high temperature and stored in the high-temperature heat storage tank;
the heat storage and exchange subsystem operates all the day, the high-temperature heat storage medium in the high-temperature heat storage tank is utilized to heat the air to the temperature required by drying, and the low-temperature heat storage medium subjected to heat exchange is discharged into the low-temperature heat storage tank for storage.
2. The industrial dry heating system of claim 1, wherein the working medium of the high temperature heat storage tank and the low temperature heat storage tank is a liquid heat storage medium or a solid heat storage medium; the liquid heat storage medium is any one of molten salt, heat conducting oil, paraffin and pressurized water, and the solid heat storage medium is solid particles.
3. The industrial drying and heating system according to claim 1, wherein the industrial drying and heating system can also eliminate four heat storage devices, namely a cold water tank, a hot water tank, a low-temperature heat storage tank and a high-temperature heat storage tank, without heat storage operation.
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| CN202211280225.8A CN115654982B (en) | 2022-10-19 | 2022-10-19 | Industrial drying and heating system |
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| CN202211280225.8A CN115654982B (en) | 2022-10-19 | 2022-10-19 | Industrial drying and heating system |
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| CN115654982B true CN115654982B (en) | 2023-10-13 |
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Citations (8)
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| CN1749670A (en) * | 2004-09-15 | 2006-03-22 | 松下电器产业株式会社 | Heat storage device of heat pump |
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| CN105221194A (en) * | 2015-11-05 | 2016-01-06 | 上海领势新能源科技有限公司 | Liquid nitrogen assists waste heat recovery energy-storing and power-generating system |
| CN108826746A (en) * | 2018-08-08 | 2018-11-16 | 廖滨 | The big temperature difference heat pump heat-storing device of high temperature and heat-storing method |
| CN109574452A (en) * | 2018-12-19 | 2019-04-05 | 上海电力学院 | A kind of multi-functional wind light mutual complementing heat pump sludge dry system |
| CN110068219A (en) * | 2019-03-15 | 2019-07-30 | 南京航空航天大学 | Analysis of Heat Pump Drying System and its working method with heat-storing device |
| CN114370720A (en) * | 2022-01-05 | 2022-04-19 | 浙江态能动力技术有限公司 | Energy storage device based on ultra-high temperature heat pump |
| CN115143664A (en) * | 2022-05-30 | 2022-10-04 | 浙江高晟光热发电技术研究院有限公司 | Vortex tube type heat pump energy storage power generation system |
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- 2022-10-19 CN CN202211280225.8A patent/CN115654982B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1749670A (en) * | 2004-09-15 | 2006-03-22 | 松下电器产业株式会社 | Heat storage device of heat pump |
| CN101846390A (en) * | 2010-03-31 | 2010-09-29 | 南京大学 | Energy storage heat pump hot water system with heat recovery function |
| CN105221194A (en) * | 2015-11-05 | 2016-01-06 | 上海领势新能源科技有限公司 | Liquid nitrogen assists waste heat recovery energy-storing and power-generating system |
| CN108826746A (en) * | 2018-08-08 | 2018-11-16 | 廖滨 | The big temperature difference heat pump heat-storing device of high temperature and heat-storing method |
| CN109574452A (en) * | 2018-12-19 | 2019-04-05 | 上海电力学院 | A kind of multi-functional wind light mutual complementing heat pump sludge dry system |
| CN110068219A (en) * | 2019-03-15 | 2019-07-30 | 南京航空航天大学 | Analysis of Heat Pump Drying System and its working method with heat-storing device |
| CN114370720A (en) * | 2022-01-05 | 2022-04-19 | 浙江态能动力技术有限公司 | Energy storage device based on ultra-high temperature heat pump |
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