Flue gas internal circulation waste heat utilization device for large flue of sintering machine

Abstract

The utility model discloses a flue gas internal circulation waste heat utilization device for a large flue of a sintering machine. The flue gas internal circulation waste heat utilization device comprises a high-temperature flue gas circulation system, a waste heat boiler system and a low-temperature flue gas system which are connected in sequence, the high-temperature flue gas system comprises a first electric air door, a second electric air door, a high-temperature flue gas pipeline and a dust remover; the dust remover is connected with the waste heat boiler system; the waste heat boiler system comprises a waste heat boiler and an electric cinder valve. The electric cinder valve is communicated with the waste heat boiler; the low-temperature flue gas system comprises an induced draft fan, a low-temperature flue gas pipeline and a flue gas hood; one end of the induced draft fan is communicated with the waste heat boiler, and the other end of the induced draft fan is communicated with the smoke hood through a low-temperature smoke pipeline. By designing the high-temperature flue gas circulating system, the waste heat boiler system and the low-temperature flue gas system, effective recovery and utilization of high-temperature flue gas are achieved, energy waste is reduced, and meanwhile the efficiency of the production process is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas waste heat utilization, and specifically relates to a device for utilizing waste heat of flue gas in a large flue of a sintering machine. Background Art

[0002] The flue gas temperature of the flue near the sintering end point of the existing sintering machine in the steel industry is relatively high, reaching 350-450℃. This part of heat is generally not effectively utilized, resulting in a great waste of energy and thermal pollution to the environment, increasing the environmental pressure of desulfurization and denitrification at the tail of the sintering machine.

[0003] In order to make full use of this waste heat resource, the technology of large flue flue gas internal circulation and waste heat boiler is adopted to recover the waste heat in the high temperature section to generate steam. At the same time, the flue gas discharged from the boiler is sent to the upper part of the sintering machine trolley for hot air sintering.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a sintering machine flue gas internal circulation waste heat utilization device. The utility model realizes that the heat energy in the high-temperature flue gas is converted into usable energy by designing a high-temperature flue gas circulation system, a waste heat boiler system and a low-temperature flue gas system, effectively avoiding energy waste and improving energy utilization efficiency; the dust collector in the device can effectively remove particulate matter in the flue gas and reduce the pollution of the flue gas to the environment; at the same time, the low-temperature flue gas is discharged after being treated, which further reduces the negative impact on the environment. Through the effective utilization of high-temperature flue gas, the energy consumption in the production process is reduced, thereby improving production efficiency and economic benefits.

[0006] In order to solve the above technical problems, the utility model provides a sintering machine large flue flue internal circulation waste heat utilization device, comprising: a high-temperature flue gas circulation system, a waste heat boiler system and a low-temperature flue gas system connected in sequence;

[0007] The high-temperature flue gas circulation system comprises: a first electric damper, a second electric damper, a high-temperature flue gas duct, and a dust collector; the dust collector is connected to the waste heat boiler system;

[0008] The waste heat boiler system comprises: a waste heat boiler and an electric ash discharge valve; the electric ash discharge valve is connected to the waste heat boiler;

[0009] The low-temperature flue gas system comprises: an induced draft fan, a low-temperature flue gas duct and a smoke hood; one end of the induced draft fan is connected to the waste heat boiler, and the other end is connected to the smoke hood through the low-temperature flue gas duct.

[0010] Further, one end of the first electric damper is connected to one end of the second electric damper, and a connecting pipe is directly provided between the first electric damper and the second electric damper;

[0011] The other end of the second electric damper is connected to one end of the high-temperature flue gas duct;

[0012] The other end of the high-temperature flue gas duct is connected to one end of the dust collector;

[0013] The other end of the dust collector is communicated with the waste heat boiler.

[0014] Furthermore, it also includes a spindle fan and a spindle air duct;

[0015] The spindle fan is communicated with one end of the spindle air duct, and the other end of the spindle air duct is communicated with the other end of the first electric damper.

[0016] Further, the main shaft air duct is connected to the connecting pipe via a first electric damper, and a plurality of air boxes are provided on the main shaft air duct and the connecting pipe;

[0017] A sintering head is arranged on the wind box, and the sintering head is communicated with a low-temperature flue gas system.

[0018] Furthermore, the number of wind boxes can be adjusted according to the flue gas temperature.

[0019] Furthermore, the sintering machine head is connected to the fume hood in the low-temperature fume system.

[0020] Furthermore, the air inlet of the induced draft fan is connected to the waste heat boiler, the air outlet of the induced draft fan is connected to one end of the low-temperature flue gas duct, and the other end of the low-temperature flue gas duct is connected to the smoke hood.

[0021] After adopting the above technical scheme, the utility model has the following beneficial effects compared with the prior art.

[0022] (1) The utility model can significantly reduce energy consumption and improve energy utilization efficiency by recovering and utilizing waste heat in high-temperature flue gas, thereby achieving the goal of energy saving and consumption reduction; through an effective flue gas treatment and recovery system, it can reduce air pollution, reduce environmental pollution, and meet environmental protection requirements; the recovery and utilization of waste heat can not only reduce energy consumption, but also use the recovered heat energy for other processes or equipment, thereby improving the economic benefits of the enterprise.

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0025] Figure 1 The present invention is a schematic diagram of the structure of a device for utilizing waste heat from internal circulation of flue gas in a large flue of a sintering machine.

[0026] Numbers in the figure:

[0027] 1. Spindle fan; 2. Spindle air duct; 3. First electric damper; 4. Second electric damper; 5. High-temperature flue gas duct; 6. Dust collector; 7. Waste heat boiler; 8. Induced draft fan; 9. Electric ash discharge valve; 10. Low-temperature flue gas duct; 11. Fume hood; 12. Sintering machine head; 13. Bellows.

[0028] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0030] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 As shown, the utility model provides a sintering machine large flue flue internal circulation waste heat utilization device, comprising: a high-temperature flue gas circulation system, a waste heat boiler system and a low-temperature flue gas system connected in sequence.

[0033] The high-temperature flue gas circulation system comprises: a first electric damper 3, a second electric damper 4, a high-temperature flue gas duct 5, and a dust collector 6; the dust collector 6 is connected to the waste heat boiler system.

[0034] The waste heat boiler system includes: a waste heat boiler 7 and an electric ash discharge valve 9 ; the electric ash discharge valve 9 is connected to the waste heat boiler 7 .

[0035] The low-temperature flue gas system includes: an induced draft fan 8 , a low-temperature flue gas duct 10 and a smoke hood 11 ; one end of the induced draft fan 8 is connected to the waste heat boiler 7 , and the other end is connected to the smoke hood 11 through the low-temperature flue gas duct 10 .

[0036] The utility model is provided with a waste heat boiler system, and the heat energy in the high-temperature flue gas is converted into usable energy, which effectively avoids energy waste and improves energy utilization efficiency; the dust collector 6 in the device can effectively remove particulate matter in the flue gas, reducing the pollution of the flue gas to the environment. At the same time, the low-temperature flue gas is discharged after being treated, which further reduces the negative impact on the environment; through the effective utilization of high-temperature flue gas, the energy consumption in the production process is reduced, thereby improving production efficiency and economic benefits.

[0037] Specifically, the device includes a high-temperature flue gas circulation system, a waste heat boiler system and a low-temperature flue gas system, wherein the high-temperature flue gas circulation system is composed of a first electric damper 3, a second electric damper 4, a high-temperature flue gas duct 5 and a dust collector 6; wherein the first electric damper 3 is closed, and the second electric damper 4 is opened to extract the high-temperature flue gas from the tail flue, and then pass through the high-temperature flue gas duct 5 and the dust collector 6 to send it to the waste heat boiler 7.

[0038] Waste heat boiler system: It consists of a waste heat boiler 7 and an electric ash discharge valve 9; the high-temperature flue gas is cooled by the waste heat boiler 7, and the dust in the flue gas is discharged from the waste heat boiler system through the electric ash discharge valve 9 after settling in the boiler.

[0039] Low-temperature flue gas system: It is composed of induced draft fan 8, low-temperature flue gas duct 10 and fume hood 11. The flue gas cooled by waste heat boiler 7 is transported to fume hood 11 on the top of sintering machine trolley through low-temperature flue gas duct 10 under the action of induced draft fan 8 for sintering. The above flue gas forms a circulation system.

[0040] The device can make full use of the flue gas waste heat of the wind box 13 at the tail of the sintering machine flue to generate steam. It can extract 15-30% of the flue gas volume of the sintering flue, reduce the load of the sintering main exhaust fan, and increase the output of the sintering machine under the condition that the existing main exhaust fan working condition remains unchanged.

[0041] Furthermore, one end of the first electric damper 3 is communicated with one end of the second electric damper 4 , and a connecting pipe is directly provided between the first electric damper 3 and the second electric damper 4 .

[0042] The other end of the second electric damper 4 is connected to one end of the high-temperature flue gas duct 5 .

[0043] The other end of the high-temperature flue gas duct 5 is connected to one end of the dust collector 6 .

[0044] The other end of the dust collector 6 is communicated with the waste heat boiler 7 .

[0045] By providing the first electric damper 3 and the second electric damper 4, as well as the connecting pipe therebetween, it is ensured that the high-temperature flue gas can smoothly enter the waste heat boiler system, thereby realizing efficient recovery of heat energy; the provision of the dust collector 6 can effectively remove particulate matter in the flue gas, which not only protects the waste heat boiler 7, prolongs its service life, but also reduces pollution to the environment.

[0046] Specifically, during the operation, the high-temperature flue gas generated by the sintering machine first passes through the first electric damper 3; after passing through the first electric damper 3, the high-temperature flue gas enters the second electric damper 4 through the connecting pipe; the second electric damper 4 controls the flue gas to continue to flow, so that it enters the high-temperature flue gas duct 5; the high-temperature flue gas is transmitted in the flue gas duct, and then enters the dust collector 6 for dust removal to remove the particulate matter therein; the flue gas after dust removal enters the waste heat boiler 7, at which time the heat energy of the flue gas is absorbed by the boiler and converted into usable energy; the low-temperature flue gas treated by the waste heat boiler 7 is discharged through the electric ash discharge valve 9, and then passes through the induced draft fan 8 and the low-temperature flue gas duct 10, and is finally discharged into the smoke hood 11.

[0047] Furthermore, it also includes a spindle fan 1 and a spindle air duct 2.

[0048] The spindle fan 1 is connected to one end of the spindle air duct 2 , and the other end of the spindle air duct 2 is connected to the other end of the first electric damper 3 .

[0049] Furthermore, the main shaft air duct 2 is connected to the connecting pipe via a first electric damper 3 , and a plurality of wind boxes 13 are provided on the main shaft air duct 2 and the connecting pipe.

[0050] The arrangement of the spindle fan 1 and the spindle air duct 2 provides a stable air flow for the system, which helps to increase the air volume in the high-temperature flue gas circulation system, thereby improving the flue gas circulation efficiency; by adjusting the opening of the spindle fan 1 and the electric damper, the air volume entering the high-temperature flue gas circulation system can be controlled, thereby optimizing the temperature and composition of the flue gas and improving the heat recovery effect of the waste heat boiler 7; the arrangement of the connecting pipe and the bellows 13 makes the air flow more uniform, avoids local overheating or overcooling, and improves the stability and reliability of the system.

[0051] Specifically, during operation, first, the spindle fan 1 starts working to suck external air or processed air into the spindle air duct 2; the air passing through the spindle air duct 2 flows to the first electric damper 3, at which time the first electric damper 3 controls the flow rate and direction of the air; the air enters the connecting pipe through the first electric damper 3, and the bellows 13 arranged on the pipe can further adjust and control the flow of air; then, the air is mixed with the high-temperature flue gas and enters the high-temperature flue gas circulation system together for subsequent dust removal and heat recovery steps; the flue gas treated by dust removal and waste heat boiler 7 is finally discharged through the low-temperature flue gas system.

[0052] A sintering head 12 is disposed on the wind box 13 , and the sintering head 12 is connected to a low-temperature flue gas system.

[0053] Furthermore, the number of the wind boxes 13 can be adjusted according to the flue gas temperature.

[0054] Furthermore, the sintering machine head 12 is connected to the fume hood 11 in the low-temperature fume system.

[0055] Furthermore, the air inlet of the induced draft fan 8 is connected to the waste heat boiler 7 , the air outlet of the induced draft fan 8 is connected to one end of the low-temperature flue gas duct 10 , and the other end of the low-temperature flue gas duct 10 is connected to the smoke hood 11 .

[0056] The high-temperature flue gas generated by the sintering machine first passes through the high-temperature flue gas circulation system, and is converted into low-temperature flue gas after dust removal and heat recovery; the low-temperature flue gas then enters the low-temperature flue gas system, and flows from the waste heat boiler 7 to the low-temperature flue gas duct 10 through the action of the induced draft fan 8; the low-temperature flue gas duct 10 transports the flue gas to the smoke hood 11, and the smoke hood 11 is connected to the sintering machine head 12, so that part of the low-temperature flue gas can re-enter the sintering machine to achieve the recycling of the flue gas.

[0057] By connecting the sintering machine head 12 with the smoke hood 11, part of the low-temperature flue gas can re-enter the sintering machine for recycling, which not only reduces energy consumption, but also improves the utilization rate of the flue gas, further enhancing the energy-saving effect of the device; the recycling of low-temperature flue gas helps to optimize the sintering process, and by adjusting the amount and temperature of the flue gas entering the sintering machine, the sintering effect and product quality can be improved; by recycling the flue gas and recovering the waste heat, the amount of flue gas directly discharged into the atmosphere is reduced, thereby reducing pollution to the environment.

[0058] Specific implementation process: The hot air at the tail end of the sintering flue is passed through the first electric damper 3 and the second electric damper 4, so that the high-temperature flue gas, under the action of the induced draft fan 8, passes through the high-temperature flue gas duct 5 and the dust collector 6, and then is heat exchanged and cooled in the waste heat boiler 7, and the waste heat boiler 7 generates steam; the cooled flue gas is transported to the upper smoke hood 11 of the sintering machine trolley through the low-temperature flue gas duct 10 under the action of the induced draft fan 8 for hot air sintering.

[0059] When the waste heat boiler 7 or the induced draft fan 8 fails, the second electric damper 4 is closed, the first electric damper 3 is opened, and the flue gas circulation waste heat utilization system is disconnected to ensure that the normal operation of the sintering machine is not affected.

[0060] The above description is only a preferred embodiment of the present invention, and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present application can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents suggested above without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the present invention.

Claims

1. A device for utilizing waste heat from internal circulation of flue gas in a sintering machine, characterized in that: include: High-temperature flue gas circulation system, waste heat boiler system and low-temperature flue gas system connected in sequence; The high-temperature flue gas circulation system comprises: a first electric damper, a second electric damper, a high-temperature flue gas duct, and a dust collector; the dust collector is connected to the waste heat boiler system; The waste heat boiler system comprises: a waste heat boiler and an electric ash discharge valve; the electric ash discharge valve is connected to the waste heat boiler; The low-temperature flue gas system comprises: an induced draft fan, a low-temperature flue gas duct and a smoke hood; one end of the induced draft fan is connected to the waste heat boiler, and the other end is connected to the smoke hood through the low-temperature flue gas duct.

2. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 1, characterized in that: One end of the first electric damper is connected to one end of the second electric damper, and a connecting pipe is directly provided between the first electric damper and the second electric damper; The other end of the second electric damper is connected to one end of the high-temperature flue gas duct; The other end of the high-temperature flue gas duct is connected to one end of the dust collector; The other end of the dust collector is communicated with the waste heat boiler.

3. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 2, characterized in that: It also includes a spindle fan and a spindle air duct; The spindle fan is communicated with one end of the spindle air duct, and the other end of the spindle air duct is communicated with the other end of the first electric damper.

4. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 3, characterized in that: The main shaft air duct is connected to the connecting pipe via a first electric damper, and a plurality of air boxes are arranged on the main shaft air duct and the connecting pipe; A sintering head is arranged on the wind box, and the sintering head is communicated with a low-temperature flue gas system.

5. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 4, characterized in that: The number of the wind boxes can be adjusted according to the flue gas temperature.

6. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 4, characterized in that: The sintering machine head is connected to the fume hood in the low-temperature fume system.

7. The device for utilizing waste heat from internal circulation of flue gas in a sintering machine according to claim 1, characterized in that: The air inlet of the induced draft fan is connected to the waste heat boiler, the air outlet of the induced draft fan is connected to one end of a low-temperature flue gas duct, and the other end of the low-temperature flue gas duct is connected to the smoke hood.

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