CN216925188U - Cement plant kiln shell hot surface waste heat recovery device - Google Patents
Cement plant kiln shell hot surface waste heat recovery device Download PDFInfo
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- CN216925188U CN216925188U CN202220569059.2U CN202220569059U CN216925188U CN 216925188 U CN216925188 U CN 216925188U CN 202220569059 U CN202220569059 U CN 202220569059U CN 216925188 U CN216925188 U CN 216925188U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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Abstract
The utility model discloses a cement plant kiln shell hot surface waste heat recovery device which comprises a heat storage and heat absorption device, a hot water pump, a hot water outlet pipeline, a steam type absorption refrigerator, a lithium bromide salt water pump, a saline water outlet pipeline, a refrigerant water pump, a refrigerant water outlet pipeline, a refrigerant water user, a refrigerant water pump, a refrigerant water outlet pipeline, a cooling water tower and the like. The heat released by the cement kiln body is absorbed through direct thermal radiation and thermal convection, and the heat and the lithium bromide secondary condensation recovery system are utilized to refrigerate to obtain a refrigerant, so that the waste heat of the cement kiln is recycled, the CO is reduced2Discharge is favorable for waterEnergy conservation and consumption reduction in the mud kiln industry. And a semi-ring type and modular structure is adopted, so that the field installation and disassembly are facilitated, and the normal maintenance of the kiln body of the cement kiln is ensured. The hot water is pumped into the steam type absorption refrigerator to serve as a heat source, low-value heat is effectively utilized to generate a refrigerant, the conversion efficiency is improved, and meanwhile, the production operation of a refrigerant water user is guaranteed, so that better economic benefits are brought.
Description
Technical Field
The utility model belongs to the technical field of energy conservation of cement kilns, and particularly relates to a device for recovering waste heat of a hot surface of a kiln shell of a cement plant.
Background
The cement is an important basic raw material and plays a significant role in the construction of economic society. Cement is also a typical energy resource bearing product, and is made to be a carbon emission household 'naturally' due to factors such as the decomposition characteristic of raw materials in the production process. Nowadays, the cement industry focuses on the use of renewable energy sources instead of fossil fuel energy sources, while improving energy efficiency. The total heat in the outlet flue gas accounts for 38-42% of the total energy input into the cement kiln, the reaction heat consumption ratio of clinker reaction is 29-33%, the heat carried by the clinker after leaving the kiln is 24-27%, the heat energy loss of dust and ash is about 1%, and the radiation and convection loss from the cement kiln shell is about 3%. It follows that the heat energy required by the flue gas, the products and the chemical reactions wastes a lot of energy during the clinker production process, so that the recovery of the heat in the exhaust gas contributes to the cement industry becoming more sustainable in terms of energy consumption. In addition, the cement kiln is usually cooled continuously by air cooling with a bottom fan in order to protect the surface of the cement kiln, which may cause about 15% of energy loss. The heat loss of the kiln shell mainly comprises radiation heat exchange and convection heat exchange. At this stage, in addition to the efficient use of heat in cement production, attention is paid to the recovery of heat loss generated by the cement kiln shell.
In order to recover the heat energy in cement production, chinese patent CN202023342250.3 discloses a waste incineration and cement kiln waste heat recovery coupled power generation system, which comprises a waste incineration system, a back pressure turbine dragging system, a cement kiln waste heat recovery system and a turbine power generation system, and a condensing turbine which sends steam into the turbine power generation system is used to do work to drive a generator to generate power. Chinese patent CN202021375460.X discloses a waste heat recovery system for a cement kiln, which is characterized in that a heat absorption mechanism is coated on the outer wall of the cement kiln, a heat absorption device in the heat absorption mechanism is utilized to effectively absorb waste heat on the outer wall of the cement kiln, and heat is stored by a water level carrier. Chinese patent CN201810240286.9 discloses a self-contained power station boiler and cement kiln waste heat recovery coupled system, which belongs to the technical field of cement production waste heat recovery and boiler, and comprises a kiln head waste heat recovery system, a rotary kiln waste heat recovery system and a power station boiler system, and the total power generation efficiency of power generation engineering is improved and the energy waste existing in the cement industry is reduced through a primary air pipeline, a primary air preheater, a secondary air pipeline and a secondary air preheater. Chinese patent CN201620473023.9 provides a waste heat recovery device for cement kiln, which realizes that the radiant heat of the rotary kiln directly heats and sends water to the boiler steam drum through the combination of the radiant heat exchanger, the first pipeline system and the second pipeline system, and does not pass through the waste heat boiler economizer, thereby increasing the generated energy of the waste heat boiler, simultaneously not affecting the exhaust gas temperature, and fully and effectively utilizing the radiant heat. The utility model has the characteristics of energy conservation and consumption reduction by innovating from a device to a system structure, but is structurally realized by heating water and sending the water to a steam packet to replace water for a steam boiler, and the heat conversion links are more, so that the heat efficiency improvement space is limited.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a device for recovering the waste heat of the hot surface of the kiln shell of the cement plant, which effectively improves the utilization efficiency of the heat of the kiln wall of the existing cement kiln.
In order to solve the technical problems, the utility model adopts a technical scheme that: a cement plant kiln shell hot surface waste heat recovery device comprises a heat storage and heat absorption device, a hot water pump, a hot water outlet pipeline, a steam type absorption refrigerator, a lithium bromide salt water pump, a brine outlet pipeline, a refrigerant water pump, a refrigerant water outlet pipeline, a refrigerant water user, a refrigerant water pump, a refrigerant water outlet pipeline and a cooling water tower;
the heat storage and absorption device, the hot water pump, the steam type absorption refrigerator and the hot water outlet pipeline are sequentially connected through pipelines to form a hot water circulation unit;
the lithium bromide salt water pump, the brine outlet pipeline and the steam type absorption refrigerator are sequentially connected through pipelines to form a brine circulating unit;
the refrigerant water pump, the refrigerant water outlet pipeline, the steam type absorption refrigerator and the refrigerant water user are sequentially connected through pipelines to form a refrigerant water circulation unit;
the refrigerant water pump, the steam type absorption refrigerator, the refrigerant water outlet pipeline and the cooling water tower are sequentially connected through pipelines to form a refrigerant water circulating unit;
the flow direction of the water in the heat storage and absorption device is the same direction and/or opposite direction to the direction of the clinker in the cement kiln.
The utility model adopts a further technical scheme for solving the technical problems that:
further, the heat-accumulating heat absorber is arranged on the outer surface of the cement kiln body, and a heat-insulating layer and an aluminum foil layer are sequentially arranged on the periphery of the heat-accumulating heat absorber outwards.
Furthermore, the distance between the inner wall of the heat storage and absorption device and the outer surface of the cement kiln is 0.2-0.3 m.
Furthermore, the effective thickness of the cavity of the heat storage and absorption device is 0.3-0.5 m.
Further, the thickness of the heat-insulating layer is 0.05-0.15 m.
Furthermore, the included angle of the heat storage heat absorber cavity is 160-175 degrees.
Furthermore, the heat-accumulating heat absorber is wrapped on the outer surface of the kiln body of the cement kiln in two semi-annular shapes, and is of a semi-annular structure, so that the heat-accumulating heat absorber is convenient to assemble and disassemble on site, and the normal overhaul of the cement kiln is guaranteed.
Furthermore, the heat-insulating layer is an expanded perlite heat-insulating layer.
Furthermore, the flow direction of water in the heat storage and absorption device is opposite to the direction of clinker in the cement kiln.
The utility model has the beneficial effects that:
1. the utility model absorbs the heat released by the cement kiln body through direct thermal radiation and thermal convection, utilizes the heat and the lithium bromide secondary condensation recovery system for refrigeration to obtain the refrigerant, recycles the waste heat of the cement kiln, reduces CO2The emission is favorable for energy conservation and consumption reduction of the cement kiln industry;
2. the semi-ring type modularized cement kiln adopts a semi-ring type modularized structure, is convenient for on-site installation and disassembly, and ensures normal maintenance of the cement kiln body;
3. according to the utility model, hot water is pumped into the steam type absorption refrigerator as a heat source, so that a refrigerant is generated by effectively utilizing low-value heat, the conversion efficiency is improved, and the production operation of a refrigerant water user is ensured, thereby bringing better economic benefit.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the regenerative heat absorber and cement kiln of the present invention;
fig. 3 is a cross-sectional view of a regenerative heat sink of the present invention;
the parts in the drawings are marked as follows:
1. heat accumulation heat absorber, 1.1, the inner wall of heat accumulation heat absorber, 1.2, the outer wall of heat accumulation heat absorber, 2, the hot-water pump, 3, hot water outlet pipeline, 4, steam type absorption refrigeration machine, 5, the lithium bromide water pump, 6, the salt water outlet pipeline, 7, the refrigerant water pump, 8, refrigerant water outlet pipeline, 9, refrigerant water user, 10, the refrigerant water pump, 11, refrigerant water outlet pipeline, 12, the cooling tower, 13, the heat preservation, 13.1, the inner wall of heat preservation, 13.2, the outer wall of heat preservation, 14, the aluminium foil layer, 15, the cement kiln body, 16, the base, I district is inside the cement kiln, II district is the air bed, III is inside the heat absorber, IV is inside the heat preservation.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.
Example (b): a cement plant kiln shell heat surface waste heat recovery device is shown in figure 1 and comprises a heat storage and heat absorption device 1, a hot water pump 2, a hot water outlet pipeline 3, a steam type absorption refrigerator 4, a lithium bromide salt water pump 5, a saline water outlet pipeline 6, a refrigerant water pump 7, a refrigerant water outlet pipeline 8, a refrigerant water user 9, a refrigerant water pump 10, a refrigerant water outlet pipeline 11 and a cooling water tower 12;
the heat storage and absorption device, the hot water pump, the steam type absorption refrigerator and the hot water outlet pipeline are sequentially connected through pipelines to form a hot water circulation unit;
the lithium bromide salt water pump, the brine outlet pipeline and the steam type absorption refrigerator are sequentially connected through pipelines to form a brine circulating unit;
the refrigerant water pump, the refrigerant water outlet pipeline, the steam type absorption refrigerator and the refrigerant water user are sequentially connected through pipelines to form a refrigerant water circulation unit;
the refrigerant water pump, the steam type absorption refrigerator, the refrigerant water outlet pipeline and the cooling water tower are sequentially connected through pipelines to form a refrigerant water circulating unit;
the flow direction of the water in the heat storage and absorption device is the same direction and/or opposite direction to the direction of the clinker in the cement kiln.
As shown in fig. 2, the heat-storage and heat-absorption device is arranged on the outer surface of the cement kiln body, and a heat-insulation layer 13 and an aluminum foil layer 14 are sequentially arranged outwards on the periphery of the heat-storage and heat-absorption device. The cement kiln body 15, the inner wall 1.1 of the heat accumulation and absorption device, the outer wall 1.2 of the heat accumulation and absorption device, the inner wall 13.1 of the heat preservation layer, the outer wall 13.2 of the heat preservation layer and the aluminum foil layer are arranged outside the cement kiln body close to one side of the cement kiln in sequence, and the cement kiln body and the heat accumulation and absorption device are both located on the base 16. The utility model separates the heat storage and absorption device from the surface of the kiln by 0.2-0.3m based on the principle that the space between the surface of the heat kiln and the secondary shell plays a crucial role in heat recovery, thereby avoiding the adverse effect on the mechanical balance of the kiln system while not increasing the weight of the kiln body.
The distance between the inner wall of the heat storage and absorption device and the outer surface of the cement kiln is 0.2-0.3m, and the optimal distance is 0.25 m.
The effective thickness of the cavity of the heat storage and heat absorber is 0.3-0.5m, and the preferable thickness is 0.4 m.
The thickness of the heat-insulating layer is 0.05-0.15m, and the preferable thickness is 0.10 m.
The included angle theta of the heat storage and heat absorber cavity is 160-175 degrees, and the preferred angle is 170 degrees.
The heat storage and heat absorber is coated on the outer surface of the cement kiln body in two semi-annular shapes. The heat storage and absorption device is of a semi-annular structure, so that the field assembly and disassembly are facilitated, and the normal maintenance of the cement kiln is guaranteed.
The heat-insulating layer is an expanded perlite heat-insulating layer.
The flow direction of the water in the heat storage and absorption device is opposite to the direction of the clinker in the cement kiln.
Through the implementation of the technical scheme, the kiln shell hot surface waste heat recovery device improves the utilization rate of cement production energy and reduces carbon emission.
In the embodiment, in order to further improve the surface waste heat utilization of the kiln shell of the cement plant and improve the low-value waste heat utilization value and the economic benefit of enterprises, the heat storage and heat absorption device is preferably of a semi-annular structure, so that the heat storage and heat absorption device is convenient to assemble and disassemble on site, and the normal maintenance of the cement kiln is guaranteed. Preferably, the heat storage and absorption device is covered with an expanded perlite heat insulation layer. Preferably, the expanded perlite heat-insulating layer is externally coated with an aluminum foil layer to prevent energy dissipation caused by heat radiation.
As shown in fig. 3, the specific thermal conversion process is: the surface temperature of the cement plant kiln shell is between 290 ℃ and 320 ℃, and the semi-ring assembled coated heat storage heat absorber absorbs the surface energy of the cement plant kiln shell through radiation heat transfer and convection heat transfer to heat water in the cavity. Hot water is pumped into the steam type absorption refrigerator through the hot water pump to complete heat exchange, and then enters the cavity of the semi-ring assembled coated heat storage heat absorber through the hot water outlet pipeline to circularly absorb heat. Lithium bromide brine, condensed water and refrigerant water are pumped into the steam type absorption refrigerator, and the commercial refrigerant water is prepared through the evaporation and condensation of the circulating pump and the refrigerator and is provided for users. In the process, parameters such as temperature, pressure, concentration and the like among four cycles are optimally configured, the heat of heat source water is utilized to the maximum extent, the temperature of hot water is reduced to be lower than 66 ℃ in a steam type absorption refrigerator, and the aim of preparing low-temperature cold water is finally achieved through repeated operation of the above cycles.
The cooling tower temperature in such systems varies widely, depending primarily on local humidity conditions and ambient air temperature. During the use of the cooling tower, the temperature of the refrigerant water is rarely lower than 29 ℃ in summer. The temperature of the coolant water may be 20 c or less after the temperature limiting factor is removed. The utility model can effectively recycle the waste heat radiated by the rotary kiln shell as a target, and the synergistic effect of the semi-ring assembled encapsulated heat storage heat absorber and the steam type absorption refrigerator is a prominent mode for realizing the target.
The waste heat utilization mode of the utility model comprises the following steps:
1. the heat on the surface of the cement kiln body is conducted to the inner wall of the semi-ring assembled encapsulated heat storage heat absorber through radiation and convection, and the water in the heat absorber is heated into hot water; hot water in the heating heat absorber enters a refrigeration system of the steam type absorption refrigerator through a hot water pump;
2. after heat exchange of the hot water in the step 1) is carried out through a refrigeration system, the hot water enters a hot water outlet pipeline and then flows back to the semi-ring assembled encapsulated heat storage heat absorber;
3. pumping the saline water into a refrigeration system by a lithium bromide pump, and evaporating the heat released by the hot water in the heat exchange step 2) into steam;
4. the refrigerant water enters the refrigeration system through a refrigerant water circulating pump, then is discharged to the cooling tower, and the cooling tower regenerates the cold water and sends the cold water back to the cooling water pump;
5. and (3) water from the refrigerant water pump enters a refrigeration system, and after heat exchange, cold water and hot water are used for cooling the saline solution to a required level by using the energy of the steps 2), 3) and 4), so that the obtained refrigerant water enters a user using system through a water outlet.
Implementation example:
a cement kiln for producing 5000t cement clinker in a large scale is designed, and a semi-ring assembled coated heat storage and absorption heat absorber and a steam type absorption refrigerating machine are utilized to improve the heat efficiency. A hot air layer is arranged between the shell of the encapsulated heat storage heat absorber and the kiln shell, and heat energy released by the kiln shell of the cement plant is absorbed through radiation and convection heat transfer when water is taken as a medium and flows through the semi-ring assembled encapsulated heat storage heat absorber. Coating type heat storage is arranged on the outer surface of a kiln shell with the length of 20 metersA heat absorber having a length corresponding to the length of the combustion zone of the cement kiln, in which zone the maximum temperature of the outer surface of the furnace shell (290-. The distance between the inner surface of the coated heat-storage heat absorber and the outer surface of the kiln is about 0.2 m. Hot water is pumped into a vapor-type absorption refrigerator by a hot water pump, brine and chilled water are selected as heat exchange media in the device, and the brine is circulated through a copper pipe embedded in a heat exchange panel. The outer side heat insulation adopts rock wool material to avoid heat loss on the surface of the kiln shell. The capacity of a system of the matched steam type absorption refrigerator is 45t, the total heat recovery rate is more than 45kW/h (or 980 kWh/day), and the energy-saving potential is 0.7-0.8 MJ/ton clinker and CO2Emission reduction equivalent of 2.9 tons of CO2And (4) a year.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a cement plant kiln shell hot surface waste heat recovery device which characterized in that: the system comprises a heat storage heat absorber (1), a hot water pump (2), a hot water outlet pipeline (3), a steam type absorption refrigerator (4), a lithium bromide salt water pump (5), a brine outlet pipeline (6), a refrigerant water pump (7), a refrigerant water outlet pipeline (8), a refrigerant water user (9), a refrigerant water pump (10), a refrigerant water outlet pipeline (11) and a cooling water tower (12);
the heat storage and absorption device, the hot water pump, the steam type absorption refrigerator and the hot water outlet pipeline are sequentially connected through pipelines to form a hot water circulation unit;
the lithium bromide salt water pump, the brine outlet pipeline and the steam type absorption refrigerator are sequentially connected through pipelines to form a brine circulating unit;
the refrigerant water pump, the refrigerant water outlet pipeline, the steam type absorption refrigerator and the refrigerant water user are sequentially connected through pipelines to form a refrigerant water circulation unit;
the refrigerant water pump, the steam type absorption refrigerator, the refrigerant water outlet pipeline and the cooling water tower are sequentially connected through pipelines to form a refrigerant water circulating unit;
the flow direction of the water in the heat storage and absorption device is the same direction and/or opposite direction to the direction of the clinker in the cement kiln.
2. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 1, characterized in that: the heat accumulation heat absorber sets up the surface at the cement kiln body, the periphery of heat accumulation heat absorber outwards is equipped with heat preservation (13) and aluminium foil layer (14) in proper order.
3. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 2, characterized in that: the distance between the inner wall of the heat storage and heat absorber and the outer surface of the cement kiln is 0.2-0.3 m.
4. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 1, characterized in that: the effective thickness of the cavity of the heat storage and heat absorber is 0.3-0.5 m.
5. The cement plant kiln shell hot surface waste heat recovery device of claim 2, characterized in that: the thickness of the heat-insulating layer is 0.05-0.15 m.
6. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 1, characterized in that: the included angle of the heat storage and heat absorber cavity is 160-175 degrees.
7. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 1, characterized in that: the heat storage and heat absorber is coated on the outer surface of the cement kiln body in two semi-annular shapes.
8. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 2, characterized in that: the heat-insulating layer is an expanded perlite heat-insulating layer.
9. The device for recovering the waste heat on the hot surface of the kiln shell of the cement plant as claimed in claim 1, characterized in that: the flow direction of the water in the heat storage and absorption device is opposite to the direction of the clinker in the cement kiln.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220569059.2U CN216925188U (en) | 2022-03-16 | 2022-03-16 | Cement plant kiln shell hot surface waste heat recovery device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220569059.2U CN216925188U (en) | 2022-03-16 | 2022-03-16 | Cement plant kiln shell hot surface waste heat recovery device |
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| CN216925188U true CN216925188U (en) | 2022-07-08 |
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| CN202220569059.2U Active CN216925188U (en) | 2022-03-16 | 2022-03-16 | Cement plant kiln shell hot surface waste heat recovery device |
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