CN216049231U - Low-temperature waste heat utilization coal-saving power generation device for cement plant - Google Patents

Low-temperature waste heat utilization coal-saving power generation device for cement plant Download PDF

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CN216049231U
CN216049231U CN202122780993.7U CN202122780993U CN216049231U CN 216049231 U CN216049231 U CN 216049231U CN 202122780993 U CN202122780993 U CN 202122780993U CN 216049231 U CN216049231 U CN 216049231U
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cement
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孙海霞
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Harbin Fuda Power Equipment Co ltd
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Harbin Fuda Power Equipment Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
    • Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply

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Abstract

The utility model provides a coal-saving power generation device utilizing low-temperature waste heat of a cement plant, belonging to the technical field of low-temperature waste heat recycling coal-saving power generation. According to the utility model, flue gas at the outlet of the kiln head boiler is introduced into the high-temperature wear-resistant fan, the flue gas discharged from the kiln head boiler is completely introduced into the grate cooler through the high-temperature wear-resistant fan, heated hot air is introduced into the inlet of the high-temperature wear-resistant fan through a hot air pipeline by using the waste heat of a cement kiln through the installation of the cement kiln heat exchange device, so that the air temperature entering the grate cooler is increased, hot water or steam generated in the cement kiln heat exchange device is introduced into the heat exchanger of the outlet flue of the high-temperature wear-resistant fan, the flue gas is heated, and the cooling air temperature entering the grate cooler is increased. The utility model recycles the low-temperature waste heat generated in the cement production process to improve the secondary air, the tertiary air and the inlet smoke temperature of the kiln head boiler, saves the fire coal in the cement burning process, improves the generated energy, can switch and control the temperature to be increased at any time, saves the energy and increases the production efficiency of enterprises.

Description

Low-temperature waste heat utilization coal-saving power generation device for cement plant
Technical Field
The utility model relates to a coal-saving power generation device utilizing low-temperature waste heat of a cement plant, belonging to the technical field of low-temperature waste heat recycling coal-saving power generation.
Background
With the rapid development of economy in China, the demand of China on coal carbon and electric power resources is increasing, but in recent years, the coal carbon and electric power resources are often in shortage, and some areas take electricity limiting measures for high-power-consumption enterprises, so that a large amount of waste heat in the production process is recycled, and the problem of enhancing the utilization efficiency of resources is to be solved urgently.
In the production process, the flue gas at the outlet of the kiln head boiler has certain temperature, and in the prior art, the kiln head boiler directly discharges the flue gas with the temperature into the atmosphere, so that the environment is influenced by the discharge of greenhouse gases, the energy waste is caused, and the utilization efficiency of the energy is reduced. Therefore, the utility model provides the coal-saving power generation device for low-temperature waste heat utilization in the cement plant, which can utilize a large amount of waste heat in the smoke at the outlet of the kiln head boiler, improve the smoke temperature of secondary air and tertiary air of the cement kiln and the smoke temperature at the inlet of the kiln head boiler, save coal burning amount in the cement production process and improve the generated energy. Not only saves the enterprise cost, but also reduces the discharge of waste heat, thereby further improving the utilization efficiency of resources.
Disclosure of Invention
The utility model aims to solve the problems in the prior art and further provides a coal-saving power generation device for low-temperature waste heat utilization in a cement plant.
The purpose of the utility model is realized by the following technical scheme:
a low-temperature waste heat utilization coal-saving power generation device of a cement plant comprises: the device comprises a kiln head boiler, a smoke exhaust pipeline, a first electric valve, a settling chamber, a second electric valve, a high-temperature wear-resistant fan, a heat exchanger, a grate cooler, a hot water or hot steam pipeline, a third electric valve, a cement kiln heat exchange device, a fourth electric valve, a hot air pipeline, an air outlet pipeline, an air inlet pipe, a fifth electric valve, a fan outlet pipeline of the grate cooler and a sixth electric valve, wherein the kiln head boiler is communicated with a kiln head boiler outlet;
the outlet of the kiln head boiler is connected with the air inlet of the high-temperature wear-resistant fan through a smoke exhaust pipeline, a second electric valve is arranged on the smoke exhaust pipeline between the kiln head boiler and the high-temperature wear-resistant fan, and the air outlet of the high-temperature wear-resistant fan is communicated with the inlet of the heat exchanger through a pipeline;
an air inlet pipe and a fan outlet pipeline of the grate cooler are arranged at the bottom of the grate cooler, a third electric valve is arranged at the lower end of the fan outlet pipeline of the grate cooler, an outlet of the heat exchanger is connected with an air outlet pipeline, the air outlet pipeline is communicated with the air inlet pipe of the grate cooler, a fifth electric valve is arranged in the air inlet pipe, and the top of the grate cooler is respectively provided with an outlet communicated with a kiln head boiler, an outlet communicated with a tertiary air pipe and a secondary air inlet communicated with a cement kiln;
the outlet at one side of the cement kiln heat exchange device is communicated with the heat exchanger through a hot water or hot steam pipeline, a sixth electric valve is arranged in the hot water or hot steam pipeline, the outlet at the other side of the cement kiln heat exchange device is communicated with a smoke exhaust pipeline between the kiln head boiler and the high-temperature wear-resistant fan through a hot air pipeline, hot air is introduced into the high-temperature wear-resistant fan, and the fourth electric valve is arranged in the hot air pipeline.
Furthermore, the kiln head boiler is respectively communicated with the settling chamber and the high-temperature wear-resistant fan through a smoke exhaust pipeline, and a first electric valve is arranged on the smoke exhaust pipeline between the kiln head boiler and the settling chamber.
Furthermore, a plurality of air inlet pipes and a plurality of fan outlet pipelines of the grate cooler are arranged at the bottom of the grate cooler, and the air outlet pipelines are respectively communicated with the air inlet pipes.
Furthermore, the position where the hot air pipeline is communicated with the smoke exhaust pipeline is positioned between a second electric valve in the smoke exhaust pipeline and a high-temperature wear-resistant fan.
Furthermore, an outlet of the grate cooler, which is communicated with the kiln head boiler, an outlet of the tertiary air pipe is communicated with the tertiary air pipe, and an inlet of secondary air, which is communicated with the cement kiln, is communicated with the cement kiln.
The utility model has the beneficial effects that:
the coal-saving power generation device for low-temperature waste heat utilization of the cement plant is a full-automatic electric control device, is realized by an electric valve, is a complete bypass system and can switch and control the temperature to be increased at any time. And opening the second electric valve, closing the first electric valve, and allowing the kiln head boiler to discharge smoke without entering a settling chamber and entering a high-temperature wear-resistant fan. And opening the fifth electric valve, closing the third electric valve, and allowing the hot smoke of the high-temperature wear-resistant fan to enter the grate cooler. And opening the electric valve to generate hot air, and enabling the hot air to enter the fan outlet of the grate cooler through the high-temperature wear-resistant fan. And opening the electrically operated valve six, inputting hot water or steam into the heat exchanger, and further increasing the temperature of hot flue gas entering the grate cooler through the heat exchanger. The opening degree of each electric valve is adjusted by the air volume of each air chamber of the original grate cooler by using a control system of the original central control chamber. Can better ensure the production quality and coal saving quantity of the cement kiln clinker. The method not only controls the emission of greenhouse gases in the production process, but also saves a large amount of coal-fired capital investment for enterprises, increases the income of the enterprises and reduces the carbon emission.
The utility model recycles the heat discharged into the outdoor air in the cement production process under the condition of not influencing the power generation of the kiln head boiler and the cement production quality, and saves a great part of fire coal in the cement production process. Saves energy and reduces the using amount of fire coal.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment 1 of the low-temperature waste heat utilization coal-saving power generation device of the cement plant of the present invention.
FIG. 2 is a schematic structural diagram of an embodiment 2 of the low-temperature waste heat utilization coal-saving power generation device of the cement plant of the present invention.
FIG. 3 is a schematic structural diagram of an embodiment 3 of the low-temperature waste heat utilization coal-saving power generation device of the cement plant of the present invention.
The reference numeral in the figure, 1 is kiln hood boiler, 2 is exhaust pipe, 3 is first electric valve, 4 is the deposit room, 5 is the second electric valve, 6 is high temperature wear-resisting fan, 7 is the heat exchanger, 8 is the grate cooler, 9 is hot water or hot steam pipeline, 10 is for acceping to kiln hood boiler outlet, 11 is for acceping to tertiary tuber pipe export, 12 is for acceping to cement kiln outlet, 13 is the third electric valve, 14 is the cement kiln heat transfer device, 15 is fourth electric valve, 16 is hot-blast pipeline, 17 is the air-out pipeline, 18 is the air-supply line, 19 is fifth electric valve, 20 is the fan outlet pipeline of grate cooler, 21 is the sixth electric valve.
Detailed Description
The utility model will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to 3, the low-temperature waste heat utilization coal-saving power generation device of the cement plant according to the present embodiment includes:
example 1
As shown in fig. 1, a kiln head boiler 1 is respectively communicated with a settling chamber 4 and a high-temperature wear-resistant fan 6 through a smoke exhaust pipeline 2, a first electric valve 3 is arranged on the smoke exhaust pipeline 2 between the kiln head boiler 1 and the settling chamber 4, a second electric valve 5 is arranged on the smoke exhaust pipeline 2 between the kiln head boiler 1 and the high-temperature wear-resistant fan 6, and an air outlet of the high-temperature wear-resistant fan 6 is communicated with an inlet of a heat exchanger 7 through a pipeline; the bottom of the grate cooler 8 is provided with a plurality of air inlet pipes 18 and a plurality of fan outlet pipelines 20 of the grate cooler, the lower end of the fan outlet pipeline 20 of the grate cooler is provided with a third electric valve 13, the outlet of the heat exchanger 7 is connected with an air outlet pipeline 17, the air outlet pipeline 17 is respectively communicated with the air inlet pipes 18 of the grate cooler 8, a fifth electric valve 19 is arranged in the air inlet pipe 18, the top of the grate cooler 8 is respectively provided with an outlet 10 leading to a kiln head boiler, an outlet 11 leading to a tertiary air pipe and an inlet 12 leading to a cement kiln secondary air, the outlet 10 leading to the kiln head boiler at the top of the grate cooler 8 is communicated with the kiln head boiler, the outlet 11 leading to the tertiary air pipe is communicated with the tertiary air pipe, and the inlet 12 leading to the cement kiln secondary air is communicated with the cement kiln.
The working principle of the embodiment is as follows: the flue gas at the outlet of the kiln head boiler 1 is introduced into a high-temperature wear-resistant fan 6 through a smoke exhaust pipeline 2, the inlet and outlet of the flue gas are controlled through a second electric valve 5 in the smoke exhaust pipeline 2, the whole discharged flue gas of the kiln head boiler 1 is introduced into a grate cooler 8 through the high-temperature wear-resistant fan 6, and the heat contained in the discharged flue gas of the kiln head boiler 1 enters a fan outlet pipeline 20 of the grate cooler. The inlet smoke temperature of the secondary air and the tertiary air is improved, the coal burning amount in the cement burning process is saved, and the inlet smoke temperature of the kiln-head boiler 1 is increased to increase the generated energy.
Example 2
As shown in fig. 2, the coal-saving power generation device for low-temperature waste heat utilization in a cement plant disclosed in this embodiment is different from that in embodiment 1, the coal-saving power generation device further includes a cement kiln heat exchange device 14, an outlet at one side of the cement kiln heat exchange device 14 is communicated with a smoke exhaust pipeline 2 between a kiln head boiler 1 and a high-temperature wear-resistant fan 6 through a hot air pipeline 16, hot air is introduced into the high-temperature wear-resistant fan 6, the position where the hot air pipeline 16 is communicated with the smoke exhaust pipeline 2 is located in the smoke exhaust pipeline 2, a second electric valve 5 leads to the position between the high-temperature wear-resistant fans 6, and a fourth electric valve 15 is arranged in the hot air pipeline 16; the rest is the same as example 1.
Compared with the embodiment 1, if the smoke temperature space required to be increased by the secondary air and the tertiary air is large, the heat exchange device 14 of the cement kiln is arranged, the waste heat of the cement kiln is utilized, the heated hot air is introduced into the inlet of the high-temperature wear-resistant fan 6 through the hot air pipeline 16, and the air temperature entering the grate cooler 8 is increased.
Example 3
As shown in fig. 3, the coal-saving power generation device utilizing low-temperature waste heat of a cement plant disclosed in this embodiment is different from embodiment 2 in that an outlet at one side of a cement kiln heat exchange device 14 is communicated with a heat exchanger 7 through a hot water or hot steam pipeline 9, a sixth electric valve 21 is arranged in the hot water or hot steam pipeline 9, and the rest is the same as embodiment 2. After the measures in the embodiment 2 are taken, a temperature rise space is provided, and by adopting the embodiment, hot water or steam generated in the heat exchange device 14 of the cement kiln can be introduced into the heat exchanger 7 of the outlet flue of the high-temperature wear-resistant fan 6 through the hot water or hot steam pipeline 9 to heat the flue gas and increase the temperature of cooling air entering the grate cooler 8.
In the embodiment, the coal saving effect is determined according to the actual temperature of the secondary air and the tertiary air which are required to be increased by the user.
In the above embodiments, embodiment 1 may be implemented alone, and embodiments 2 and 3 may be implemented simultaneously with embodiment 1 or separately in combination with embodiment 1. In addition, the cement kiln heat exchange device 14 mentioned in the embodiment adopts the prior art, the patent application number is 201820895814.X (the name of the utility model is: a cement kiln steam heat exchanger), according to the actual situation of a user, if the smoke temperature space required to be improved by secondary air and tertiary air is large, heated hot air can be introduced into the inlet of the high-temperature wear-resistant fan 6 by installing the cement kiln heat exchange device 14 and utilizing the waste heat of the cement kiln, so as to improve the air temperature entering the grate cooler 8, and if the air temperature needs to be further improved, water or steam generated by the cement kiln heat exchange device 14 can be heated and introduced into the heat exchanger 7, so as to further improve the cooling air temperature entering the grate cooler 8.
The application data of the apparatus of example 1 are as follows:
the device of the embodiment 1 is adopted in a clinker production line of 5000 tons, the smoke discharge temperature of a kiln head is 100 ℃, and the smoke discharge flow is 40 kilometers3After the kiln head exhaust smoke is heated by a heat exchanger on an outlet pipeline of the high-temperature wear-resistant fan, the temperature can be increased by 50 ℃ on the basis of 100 ℃, and the temperature of cooling air entering the grate cooler can reach 150 ℃.
The coal saving amount is calculated according to the cooling air temperature of 100 ℃ temporarily, and the annual coal saving amount of each production line is as follows:
air enthalpy at 30 deg.C 39.72KJ/NM3
Air enthalpy value of 132KJ/NM at 100 DEG C3
Flow rate of 40 ten thousand NM3/h
Recovered heat 400000 × (158.4-26.48) ═ 36912000KJ/h
Standard coal heat quantity 29307KJ/Kg
36912000÷29307＝1260Kg
Utilization rate of 0.9
Saving coal amount per day: 1260 × 24 ÷ 0.9 ÷ 1000 ═ 33.6 tons
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. A coal-saving power generation device utilizing low-temperature waste heat of a cement plant is characterized by comprising: the device comprises a kiln head boiler (1), a smoke exhaust pipeline (2), a second electric valve (5), a high-temperature wear-resistant fan (6), a heat exchanger (7), a grate cooler (8), a hot water or hot steam pipeline (9), an outlet (10) leading to the kiln head boiler, an outlet (11) leading to a tertiary air pipe, a secondary air inlet (12) leading to a cement kiln, a third electric valve (13), a cement kiln heat exchange device (14), a fourth electric valve (15), a hot air pipeline (16), an air outlet pipeline (17), an air inlet pipe (18), a fifth electric valve (19), a fan outlet pipeline (20) of the grate cooler and a sixth electric valve (21);
the outlet of the kiln head boiler (1) is connected with the air inlet of the high-temperature wear-resistant fan (6) through a smoke exhaust pipeline (2), a second electric valve (5) is arranged on the smoke exhaust pipeline (2) between the kiln head boiler (1) and the high-temperature wear-resistant fan (6), and the air outlet of the high-temperature wear-resistant fan (6) is communicated with the inlet of the heat exchanger (7) through a pipeline;
an air inlet pipe (18) and a fan outlet pipeline (20) of the grate cooler are arranged at the bottom of the grate cooler (8), a third electric valve (13) is arranged at the lower end of the fan outlet pipeline (20) of the grate cooler, an outlet of the heat exchanger (7) is connected with an air outlet pipeline (17), the air outlet pipeline (17) is communicated with the air inlet pipe (18) of the grate cooler (8), a fifth electric valve (19) is arranged in the air inlet pipe (18), and the top of the grate cooler (8) is respectively provided with an outlet (10) leading to a kiln head boiler, an outlet (11) leading to a tertiary air pipe and an inlet (12) leading to a secondary air of the cement kiln;
an outlet at one side of the cement kiln heat exchange device (14) is communicated with the heat exchanger (7) through a hot water or hot steam pipeline (9), a sixth electric valve (21) is arranged in the hot water or hot steam pipeline (9), an outlet at the other side of the cement kiln heat exchange device (14) is communicated with a smoke exhaust pipeline (2) between the kiln head boiler (1) and the high-temperature wear-resistant fan (6) through a hot air pipeline (16), hot air is introduced into the high-temperature wear-resistant fan (6), and a fourth electric valve (15) is arranged in the hot air pipeline (16).
2. The coal-saving power generation device for low-temperature waste heat utilization of a cement plant as claimed in claim 1, wherein the kiln head boiler (1) is respectively communicated with the settling chamber (4) and the high-temperature wear-resistant fan (6) through a smoke exhaust pipeline (2), and a first electric valve (3) is arranged on the smoke exhaust pipeline (2) between the kiln head boiler (1) and the settling chamber (4).
3. The coal-saving power generation device for low-temperature waste heat utilization of a cement plant as claimed in claim 1, wherein the bottom of the grate cooler (8) is provided with a plurality of air inlet pipes (18) and a plurality of fan outlet pipelines (20) of the grate cooler, and the air outlet pipeline (17) is respectively communicated with the plurality of air inlet pipes (18).
4. The coal-saving power generation device utilizing the low-temperature waste heat of the cement plant as claimed in claim 1, wherein the position where the hot air pipeline (16) is communicated with the smoke exhaust pipeline (2) is located between the second electric valve (5) in the smoke exhaust pipeline (2) and the high-temperature wear-resistant fan (6).
5. The coal-saving power generation device for low-temperature waste heat utilization of a cement plant as claimed in claim 1, wherein an outlet (10) of the grate cooler (8) leading to the kiln head boiler is communicated with the kiln head boiler, an outlet (11) leading to the tertiary air duct is communicated with the tertiary air duct, and an inlet (12) leading to the secondary air of the cement kiln is communicated with the cement kiln.
CN202122780993.7U 2021-11-15 2021-11-15 Low-temperature waste heat utilization coal-saving power generation device for cement plant Active CN216049231U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115406252A (en) * 2022-08-11 2022-11-29 中材节能股份有限公司 A comprehensive utilization method of cement kiln waste heat based on primary reheat technology

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115406252A (en) * 2022-08-11 2022-11-29 中材节能股份有限公司 A comprehensive utilization method of cement kiln waste heat based on primary reheat technology
CN115406252B (en) * 2022-08-11 2024-05-24 中材节能股份有限公司 A comprehensive utilization method of cement kiln waste heat based on single reheating technology

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