CN213238482U

CN213238482U - Unpowered waste heat utilization structure of sintering circular cooler low-temperature section flue gas

Info

Publication number: CN213238482U
Application number: CN202021638912.9U
Authority: CN
Inventors: 李超
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-10
Filing date: 2020-08-10
Publication date: 2021-05-18
Anticipated expiration: 2030-08-10

Abstract

The utility model relates to a unpowered waste heat utilization structure of flue gas in the low temperature section of a sintering circular cooler, belonging to the technical field of sintering procedures of iron and steel enterprises; a plurality of smoke collecting and sealing ports are fixed at the upper end of a sealing cover of the sintering and cooling chain plate machine, a soot blower is arranged at the upper end of each smoke collecting and sealing port, and a waste heat recovery device is arranged at the upper end of each soot blower; the waste heat recovery device comprises a desalting water tank, a three-stage waste heat recovery device, a waste heat water tank, a first steam drum, a second steam drum, a first-stage waste heat recovery device and a steam turbine, wherein the feed end of a desalting water pump is communicated with the desalting water tank, and the discharge end of the desalting water pump is connected with one end of the three-stage waste heat recovery device; the medium pressure steam, the low pressure steam or the hot water is generated by recovering the flue gas waste heat in different sections of the device, the medium pressure steam is used for generating electricity, the low pressure steam is used for production and use, the hot water is sent to the secondary waste heat recovery device, and a medium for heating, refrigerating or heating can also be led out, so that the coupling utilization of the sintering flue gas waste heat is realized, and the heat efficiency is improved.

Description

Unpowered waste heat utilization structure of sintering circular cooler low-temperature section flue gas

Technical Field

The utility model relates to a steel enterprise sintering process technical field, concretely relates to cold quick-witted low temperature section unpowered waste heat utilization structure of flue gas of sintered ring.

Background

The energy consumption of the sintering process of the iron and steel enterprise is only next to the iron-making process, generally 10% -20% of the total energy consumption of the iron and steel enterprise, the energy consumption of the sintering process in China has a large difference compared with advanced countries, the average energy consumption of each ton of sintered ore is 20kgce higher, in the total energy consumption of the sintering process, nearly 50% of heat energy is discharged into the atmosphere in the form of sensible heat of flue gas of a sintering machine and waste gas of a cooling machine, so that the heat energy is wasted and the environment is polluted, according to the heat balance test data of a certain steel plant in Japan, the sensible heat of the sintered ore accounts for 28.2% and the sensible heat of the waste gas accounts for 31.8%, therefore, the key point of the waste heat recovery of the sintering plant is the waste (smoke) gas waste heat recovery and the sensible heat of the sintered ore (product), and; at present, most sintering plants in China generally adopt a waste heat recycling device, sintering waste heat utilization equipment is arranged on a circular cooler of a sintering machine, the temperature of generated flue gas is 160-280 ℃ in the cooling process of III sections of sintered ores, the flue gas is unstable, and the flue gas is generally directly discharged due to low quality, so that energy waste is caused, and the environment is polluted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art's defect and not enough, provide a cold quick-witted low temperature section unpowered waste heat utilization structure of flue gas of sintering ring of reasonable in design, retrieve flue gas waste heat production middling pressure steam, low pressure steam or hot water in the different segmentation of device, middling pressure steam is used for the electricity generation, and low pressure steam is used for the plant use, and hot water is delivered to second grade waste heat recovery device, also can draw forth and be used for heating, refrigeration or heating medium, has realized the coupling utilization of sintering flue gas waste heat, has improved the thermal efficiency.

In order to achieve the above purpose, the utility model adopts the following technical proposal: the sintering cooling chain plate machine sealing cover is fixedly provided with a plurality of smoke collecting sealing ports at the upper end, the soot blowing device is arranged at the upper end of the smoke collecting sealing ports, and the waste heat recovery device is arranged at the upper end of the soot blowing device; the waste heat recovery device comprises a desalting water tank, three-level waste heat recovery, a waste heat water tank, a steam drum, a second steam drum, one-level waste heat recovery, a steam turbine, the feed end and the desalting water tank through connection of a desalting water pump, the discharge end and the one end of three-level waste heat recovery of the desalting water pump are connected, the other end of three-level waste heat recovery is connected with the waste heat water tank, the feed end and the waste heat water tank of the desalting water pump are connected, the discharge end and the user of the desalting water pump are connected, the user is connected with the desalting water tank, the other end of three-level waste heat recovery is also fixed with the steam drum, the first steam drum is connected with second-level waste heat recovery, the other end of second-level waste heat recovery is absorbed in production, the other end of second-level waste heat recovery is also connected with the second steam drum, the second steam drum is connected with the.

After the structure is adopted, the beneficial effects of the utility model are that: the utility model discloses in the cold quick-witted unpowered waste heat utilization structure of cold low temperature section flue gas of sintered ring, retrieve flue gas waste heat in the different segmentation of device and produce middling pressure steam, low pressure steam or hot water, middling pressure steam is used for the electricity generation, and low pressure steam is used for the plant use, and hot water is sent to second grade waste heat recovery device, also can draw forth and be used for heating, refrigeration or heating medium, has realized the coupling utilization of sintering flue gas waste heat, has improved the thermal efficiency.

Description of the drawings:

fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the middle waste heat recovery device of the present invention.

Description of reference numerals:

the device comprises a sintering cooling chain plate machine sealing cover 1, a flue gas collecting sealing port 2, a soot blower 3, a waste heat recovery device 4, a desalting water tank 5, a three-stage waste heat recovery 6, a waste heat water tank 7, a first steam drum 8, a second steam drum 9, a first-stage waste heat recovery 10, a steam turbine 11, a desalting water pump 12, a second-stage waste heat recovery 13, a waste heat water pump 14, a production device 15 and a user 16.

The specific implementation mode is as follows:

the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1-2, the following technical solutions are adopted in the present embodiment: the sintering cooling chain plate machine sealing cover comprises a sintering cooling chain plate machine sealing cover 1, a smoke collection sealing port 2, a soot blowing device 3 and a waste heat recovery device 4, wherein a plurality of smoke collection sealing ports 2 are fixed at the upper end of the sintering cooling chain plate machine sealing cover 1, the soot blowing device 3 is arranged at the upper end of the smoke collection sealing port 2, and the waste heat recovery device 4 is arranged at the upper end of the soot blowing device 3; the waste heat recovery device 4 comprises a desalted water tank 5, a third-level waste heat recovery 6, a waste heat water tank 7, a first steam drum 8, a second steam drum 9, a first-level waste heat recovery 10 and a steam turbine 11, wherein the feed end of a desalted water pump 12 is communicated with the desalted water tank 5, the discharge end of the desalted water pump 12 is connected with one end of the third-level waste heat recovery 6, the other end of the third-level waste heat recovery 6 is connected with the waste heat water tank 7, the feed end of a waste heat water pump 14 is connected with the waste heat water tank 7, the discharge end of the waste heat water pump 14 is connected with a user 16, the user 16 is connected with the desalted water tank 5, the other end of the third-level waste heat recovery 6 is fixedly provided with the first steam drum 8, the first steam drum 8 is connected with the second-level waste heat recovery 13, the other end of the second-level waste heat recovery 13 is connected with a production device 15, the other end, the other end of the primary waste heat recovery 10 is connected with a steam turbine 11.

The working principle of the specific embodiment is as follows: the desalting water tank 5 is pumped out by the desalting water pump 12 and is firstly sent to the three-stage waste heat recovery 6 to exchange heat with sintering cooling flue gas, superheated water at 100-110 ℃ is obtained, and the superheated water is removed from two parts according to production needs: firstly, the temperature is controlled to be 105 ℃ and the steam is sent to a first steam drum 8 connected with a secondary waste heat recovery 13; secondly, controlling the water temperature to be 100-110 ℃ as required and sending the water to a user 16 by a waste heat water pump 14, wherein the user 16 can comprise heating, refrigerating and heating media; the control of the two paths is realized by a valve, steam generated by the first steam pocket 8 is sent to the lower section of the secondary waste heat recovery 13 to exchange heat with high-temperature flue gas to generate low-pressure steam which is used as production steam, water generated by separation in the first steam pocket 8 enters an upper header of the secondary waste heat recovery 13 to exchange heat with counter-current flue gas from top to bottom, and generated superheated water is sent to the second steam pocket 9 connected with the primary waste heat recovery 10; in the second steam drum 9, steam generated by gas-liquid separation enters the lower part of the primary waste heat recovery 10, medium-pressure superheated steam generated by heat exchange with highest-temperature flue gas is sent to a steam turbine 11 for power generation, water generated by gas-liquid separation in the second steam drum 9 is sent to an upper header of the primary waste heat recovery 10, heat exchange is carried out with counter-current flue gas from top to bottom, generated superheated water is sent to the second steam drum 9 to further generate steam, and liquid-phase water is sent back to the primary waste heat recovery 10 for cyclic heating; the flue gas with the temperature of 150 ℃ after passing through the low-temperature section of the waste heat recovery device 4 is discharged into the atmosphere through a chimney.

After adopting above-mentioned structure, this embodiment's beneficial effect is as follows: according to the unpowered waste heat utilization structure of flue gas in the low temperature section of the sintering circular cooler, flue gas waste heat is recovered in different sections of the device to generate medium-pressure steam, low-pressure steam or hot water, the medium-pressure steam is used for power generation, the low-pressure steam is used for production and use, the hot water is sent to a secondary waste heat recovery device and can also be led out to be used for heating, refrigerating or heating media, the coupling utilization of the sintering flue gas waste heat is realized, and the heat efficiency is improved.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. The unpowered waste heat utilization structure of flue gas at the low temperature section of the sintering ring cooling machine comprises a sintering cooling chain plate machine sealing cover (1), flue gas collecting sealing ports (2), a soot blowing device (3) and a waste heat recovery device (4), wherein a plurality of flue gas collecting sealing ports (2) are fixed at the upper end of the sintering cooling chain plate machine sealing cover (1), the soot blowing device (3) is arranged at the upper end of each flue gas collecting sealing port (2), and the waste heat recovery device (4) is arranged at the upper end of each soot blowing device (3); the method is characterized in that: the waste heat recovery device (4) comprises a desalting water tank (5), a three-stage waste heat recovery tank (6), a waste heat water tank (7), a first steam drum (8), a second steam drum (9), a first-stage waste heat recovery tank (10) and a steam turbine (11), wherein the feeding end of a desalting water pump (12) is communicated with the desalting water tank (5), the discharging end of the desalting water pump (12) is connected with one end of the three-stage waste heat recovery tank (6), the other end of the three-stage waste heat recovery tank (6) is connected with the waste heat water tank (7), the feeding end of the waste heat water pump (14) is connected with the waste heat water tank (7), the discharging end of the waste heat water pump (14) is connected with a user (16), the user (16) is connected with the desalting water tank (5), the other end of the three-stage waste heat recovery tank (6) is also fixedly provided with the first steam drum (8), the first steam drum (8) is connected with the second-stage waste heat recovery tank (13), and the other end of the second-stage waste heat, the other end of the secondary waste heat recovery device (13) is also connected with a second steam drum (9), the second steam drum (9) is connected with a primary waste heat recovery device (10), and the other end of the primary waste heat recovery device (10) is connected with a steam turbine (11).