Kiln slag dry cooling waste heat recovery system

Abstract

The utility model discloses a kiln slag dry method cooling waste heat recovery system, which relates to the technical field of kiln slag dry method cooling waste heat recovery, and comprises a rotary kiln, one end of the rotary kiln is fixedly connected with a first-stage kiln slag conveyor through a slag inlet, and one end of the first-stage kiln slag conveyor far away from the slag inlet is provided with an adjusting air inlet and a discharge port a. A second-stage kiln slag conveyor is installed at the other end of the discharging port a, a wet flue gas outlet is formed in the upper end of the second-stage kiln slag conveyor, atomization coolers are symmetrically installed at the upper end of the interior of the second-stage kiln slag conveyor, and a discharging port b is formed in the end, away from the fine slag inlet, of the second-stage kiln slag conveyor; a wet dust removal system is mounted at one end of a wet flue gas outlet in the upper end of the second-stage kiln slag conveyor, and an absorption module is arranged at the upper end in the first-stage kiln slag conveyor. By adopting the structure, the cooling, waste heat utilization, conveying and storage requirements of the high-temperature kiln slag can be effectively met, and the device has the advantages of high efficiency, reliability, energy conservation, water conservation, environmental protection, full sealing and automation.

Description

TECHNICAL FIELD

[0001] The utility model belongs to kiln slag dry method cooling waste heat recovery technical field, especially relates to a kiln slag dry method cooling waste heat recovery system. BACKGROUND

[0002] The kiln slag is an industrial residue produced by rotary kiln after high-temperature treatment of blast furnace gas ash, and the tapping temperature is about 950-1050 DEG C. The current kiln slag treatment method is usually wet treatment. After the high-temperature kiln slag is discharged from the rotary kiln tapping hole, the kiln slag is cooled by water flow or water pool immersion. This cooling method results in that the heat of the high-temperature kiln slag is all wasted after contacting with water. Moreover, the production and treatment of the kiln slag are highly dependent on manual intervention, increasing the labor cost. The smoke and steam generated in the production process from the blast furnace gas ash to the kiln slag are discharged without organization, polluting the environment. The wet kiln slag usually needs to be dried for reuse or subsequent treatment, further increasing the time and labor cost.

[0003] Therefore, the automatic dry treatment process for the high-temperature kiln slag can solve the above problems. Firstly, the waste heat of the high-temperature kiln slag can be recovered and utilized, saving energy and avoiding waste of energy. Secondly, the dry treatment of the kiln slag can save 70% of the production water. Thirdly, the cooling, conveying and collecting processes of the kiln slag can be automatically sealed. Fourthly, the high-temperature kiln slag enters from the head of the system, the next high-temperature kiln slag is output from the tail end of the system, and the generated steam and waste gas can be effectively treated and discharged, without polluting the environment. Fifthly, the kiln slag treated by the system has low water content and can be directly used for the next step, saving time and cost. UTILITY MODEL CONTENT

[0004] In view of the problems mentioned in the background, the utility model aims to provide a kiln slag dry cooling waste heat recovery system to solve the problems that the kiln slag is cooled by water flow or water pool immersion, the heat of the high-temperature kiln slag is all wasted after contacting with water, the smoke and steam generated in the production process from the blast furnace gas ash to the kiln slag are discharged without organization, polluting the environment, and the production and treatment of the kiln slag are highly dependent on manual intervention, increasing the labor cost.

[0005] The above technical purpose of the utility model is achieved by the following technical scheme.

[0006] The utility model provides a kiln slag dry method cooling waste heat recovery system, including rotary kiln, the rotary kiln one end passes in the slag port fixedly connected with the first stage kiln slag conveyer, the first stage kiln slag conveyer upper end is equipped with high temperature air outlet, the first stage kiln slag conveyer is equipped with the adjusting air inlet and the discharge port a away from the in the slag port one end, the discharge port a other end is installed with the second stage kiln slag conveyer, the second stage kiln slag conveyer upper end is equipped with the wet flue gas outlet, the second stage kiln slag conveyer inside upper end is installed with the atomization cooler, the second stage kiln slag conveyer is equipped with the discharge port b away from the fine slag inlet one end, the discharge port b other end is fixedly connected with fine slag bin, the wet flue gas outlet of second stage kiln slag conveyer upper end is installed with the wet dust removal system, the first stage kiln slag conveyer inside upper end is equipped with the absorption module.

[0007] As a preferred technical solution, the rotary kiln is provided with a material inlet and a combustion air outlet at one end, and a slag discharge port and a combustion-supporting air inlet at the other end.

[0008] As a preferred technical solution, the discharge port a is fixedly connected with a slag block screen at the other end, the slag block screen is internally provided with a screen, the slag block screen is provided with a fine slag outlet at the bottom, the second stage kiln slag conveyer is fixedly connected with a fine slag inlet at the upper end, the fine slag inlet is fixedly connected with the fine slag outlet, and the slag block screen is provided with a large slag outlet at the bottom, and the large slag outlet is fixedly connected with a large slag bin at the bottom end.

[0009] As a preferred technical solution, the wind blocking device is a flexible sealing device, which can isolate the spaces on the left and right sides from each other, prevent air flow between the two spaces, prevent air leakage, and does not affect the forward conveying of materials on the first stage kiln slag conveyer and the second stage kiln slag conveyer.

[0010] As a preferred technical solution, the first stage kiln slag conveyer is internally provided with a flue gas waste heat boiler at the upper end, the flue gas waste heat boiler is provided with a flue gas outlet and a flue gas inlet at both ends, the combustion air outlet of the rotary kiln is connected with the flue gas inlet of the flue gas waste heat boiler, the flue gas outlet of the flue gas waste heat boiler is fixedly connected with a flue gas post-treatment system, and the flue gas post-treatment system can be a dry dust removal system that operates independently or a comprehensive treatment system that simultaneously processes waste gas generated by other systems.

[0011] As a preferred technical solution, the high temperature air outlet is fixedly connected with a dry dust remover at the other end, the dry dust remover is installed with a combustion-supporting air fan at the other end, and the combustion-supporting air fan is connected with the combustion-supporting air inlet at one end of the rotary kiln.

[0012] In summary, the utility model mainly has the following beneficial effects:

[0013] The high-temperature kiln slag enters the tail of the first kiln slag conveyor from the slag inlet, and the high-temperature kiln slag is conveyed to the head direction by the first kiln slag conveyor, the radiant heat of the high-temperature kiln slag is absorbed by the membrane water cooling wall installed on the upper portion of the first kiln slag conveyor during the conveying process of the high-temperature kiln slag, and the high-temperature water generated by the absorbed heat is conveyed to the flue gas waste heat boiler, heat is taken by the flue gas waste heat boiler, and the low-temperature water after heat taking is returned to the membrane water cooling wall heating surface by the flue gas waste heat boiler, the cold air is drawn into the interior of the first kiln slag conveyor from the first kiln slag conveyor head regulating air door by the combustion-supporting fan during the conveying process of the high-temperature kiln slag, the cold air is used for air cooling the high-temperature kiln slag, the high-temperature kiln slag is changed into the secondary high-temperature kiln slag with a temperature of about 400 DEG C, the cooling air is changed into high-temperature air, the high-temperature air is discharged from the first kiln slag conveyor through the high-temperature air outlet, and after dust removal by the high-temperature dust remover, the high-temperature air is sent into the rotary kiln by the combustion-supporting fan through the combustion-supporting air inlet and is used for combustion-supporting the materials in the rotary kiln, the air in the spaces on the two sides of the first kiln slag conveyor is prevented from air leakage by the air baffle device, the cooling, waste heat utilization, conveying and storage requirements of the high-temperature kiln slag can be effectively met, and the high-temperature kiln slag has the advantages of high efficiency, reliability, energy saving, water saving, environmental protection, full sealing and automation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is the system flow chart of the utility model;

[0015] Figure 2 is the Figure 1 enlarged view of A part of the utility model;

[0016] Figure 3 is the Figure 1 enlarged view of B part of the utility model;

[0017] Figure 4 is the sectional view of the membrane water cooling wall heating surface installed on the upper portion of the kiln slag conveyor of the utility model;

[0018] Figure 5 is the sectional view of the atomizing cooler installed on the upper portion of the kiln slag conveyor of the utility model;

[0019] Figure 6 is the sectional view of the air baffle device installed on the upper portion of the kiln slag conveyor of the utility model.

[0020] Reference: 1, rotary kiln; 2, inlet; 3, overfire air outlet; 4, combustion air inlet; 5, slag discharge port; 6, slag inlet; 7, first-stage kiln slag conveyor; 8, high-temperature air outlet; 9, adjusting damper; 10, discharge port a; 11, slag block sizer; 12, screen; 13, large slag outlet; 14, fine slag outlet; 15, large slag bin; 16, fine slag inlet; 17, second-stage kiln slag conveyor; 18, atomizing cooler; 19, wet flue gas outlet; 20, discharge port b; 21, fine slag bin; 22, wind shielding device; 23, radiant heat absorption module; 24, flue gas waste heat boiler; 25, flue gas outlet; 26, flue gas inlet; 27, dry dust collector; 28, combustion air fan; 29, wet dust removal system; 291, wet dust collector; 292, fan a; 293, chimney a; 30, flue gas post-processing system. DETAILED DESCRIPTION

[0021] EMBODIMENT

[0022] REFERENCE Figures 1 to 6The kiln slag dry method cooling waste heat recovery system of the embodiment, including rotary kiln 1, the one end of rotary kiln 1 is fixedly connected with a first kiln slag conveyor 7 through slag inlet 6, and the upper end of first kiln slag conveyor 7 is provided with high-temperature air outlet 8; the end of first kiln slag conveyor 7 away from slag inlet 6 is provided with adjusting air inlet 9 and discharge port a 10; the other end of discharge port a 10 is fixedly connected with a second kiln slag conveyor 17; the upper end of second kiln slag conveyor 17 is provided with wet flue gas outlet 19; the upper end of second kiln slag conveyor 17 is symmetrically installed with atomizing cooler 18; the end of second kiln slag conveyor 17 away from fine slag inlet 16 is provided with discharge port b 20; the other end of discharge port b 20 is fixedly connected with fine slag bin 21; the end of wet flue gas outlet 19 of the upper end of second kiln slag conveyor 17 is installed with wet dust removal system 29; the upper end of the inside of first kiln slag conveyor 7 is provided with absorption module 23; absorption module 23 is membrane water cooling wall. High-temperature kiln slag at 950 DEG C to 1050 DEG C enters the tail of first kiln slag conveyor 7 through slag inlet 6; high-temperature kiln slag is conveyed by first kiln slag conveyor 7; membrane water cooling wall installed on the upper part of first kiln slag conveyor 7 absorbs the radiation heat of high-temperature kiln slag in the conveying process of high-temperature kiln slag; high-temperature water generated by the absorbed heat is conveyed to flue gas waste heat boiler 24; heat is taken by flue gas waste heat boiler 24; low-temperature water after heat taking is sent back to the membrane water cooling wall heating surface by flue gas waste heat boiler 24; cold air is drawn into the inside of first kiln slag conveyor 7 from the head of first kiln slag conveyor 7 through adjusting air door 9 by combustion air fan 28 in the conveying process of high-temperature kiln slag; the cold air absorbs the heat of kiln slag; high-temperature kiln slag is changed into secondary high-temperature kiln slag at about 400 DEG C; cooling air is changed into high-temperature air; high-temperature air is discharged from first kiln slag conveyor 7 through high-temperature air outlet 8; after dust removal by dry dust remover 27, the high-temperature air is sent into rotary kiln 1 through combustion air inlet 4 by combustion air fan 28 to assist combustion of the materials in rotary kiln 1; secondary high-temperature kiln slag is discharged from first kiln slag conveyor 7 through discharge port a 10 and enters slag block screen classifier 11; screen 12 in slag block screen classifier 11 can screen different particle sizes of kiln slag; fine slag can pass through screen 12 and be discharged from slag block screen classifier 11 through fine slag outlet 14; fine slag enters second kiln slag conveyor 17 through fine slag inlet 16; second kiln slag conveyor 17 conveys secondary high-temperature kiln slag to the head direction; atomizing cooler 18 installed on the upper part of the shell of second kiln slag conveyor 17 sprays atomized water to secondary high-temperature kiln slag in the conveying process; kiln slag continues to be conveyed forward through second kiln slag conveyor 17 and falls into fine slag bin 21 through discharge port b 20 for end storage.

[0023] Reference Figure 1, the rotary kiln 1 one end is equipped with the inlet 2 and the exhaust air outlet 3, the rotary kiln 1 the other end is equipped with the slag outlet 5 and the combustion air inlet 4, the slag outlet 5 the other end is fixedly connected with the first stage kiln slag conveyor 7 through the slag inlet 6, the blast furnace ash and other raw materials enter the system from the rotary kiln 1 inlet 2, and the raw materials are treated at high temperature in the rotary kiln 1, and the high-temperature kiln slag at about 950 DEG C to 1050 DEG C is discharged from the slag outlet 5.

[0024] Reference Figure 2 , the other end of the discharge port a10 is fixedly connected with the slag block screen separator 11, the slag block screen separator 11 is internally provided with a screen 12, the bottom of the slag block screen separator 11 is provided with a fine slag outlet 14, the upper end of the second stage kiln slag conveyor 17 is fixedly connected with a fine slag inlet 16, the fine slag inlet 16 is fixedly connected with the fine slag outlet 14, the bottom of the slag block screen separator 11 is provided with a large slag outlet 13, the bottom end of the large slag outlet 13 is fixedly connected with a large slag bin 15, and the screen 12 in the slag block screen separator 11 can screen the kiln slag of different particle sizes. The large slag cannot pass through the screen 12, and is discharged from the slag block screen separator 11 through the large slag outlet 13 on the upper side of the screen 12 and enters the large slag bin 15 for end storage.

[0025] Reference Figure 6 , the inside of the second stage kiln slag conveyor 17 is provided with a wind blocking device 22 between the atomizing cooler 18 and the fine slag inlet 16, and between the high-temperature air outlet 8 and the slag inlet 6 in the inside of the first stage kiln slag conveyor 7, the wind blocking device 22 in the inside of the first stage kiln slag conveyor 7 can effectively prevent the air in the space on both sides from air leakage, and the wind blocking device 22 in the inside of the second stage kiln slag conveyor 17 can effectively prevent the air in the space on both sides from air leakage, and the wet flue gas is isolated in the space on the side of the wet flue gas outlet 19.

[0026] Reference Figure 1 , the inside of the first stage kiln slag conveyor 7 is provided with a flue gas waste heat boiler 24 at the upper end, the flue gas waste heat boiler 24 is provided with a flue gas outlet 25 and a flue gas inlet 26 at both ends, the exhaust air outlet 3 of the rotary kiln 1 is connected with the flue gas inlet 26 of the flue gas waste heat boiler 24, and the flue gas outlet 25 of the flue gas waste heat boiler 24 is fixedly connected with a flue gas aftertreatment system 30. When the exhaust air temperature of the rotary kiln 1 is high, the exhaust air is led out from the exhaust air outlet 3, enters the flue gas waste heat boiler 24 from the flue gas inlet 26, is discharged from the flue gas outlet 25 after waste heat recovery, and is then treated by the flue gas aftertreatment system 30 and discharged.

[0027] Reference Figure 1The other end of the high-temperature air outlet 8 is fixedly connected with a dry dust collector 27, the other end of the dry dust collector 27 is installed with a combustion-supporting fan 28, the combustion-supporting fan 28 is connected with the combustion-supporting air inlet 4 at one end of the rotary kiln 1, in the process of conveying the high-temperature kiln slag, the cold air is drawn by the combustion-supporting fan 28 from the head adjusting air door 9 of the primary kiln slag conveyor 7 into the inside of the primary kiln slag conveyor 7, the high-temperature kiln slag in conveying is air-cooled, the cold air absorbs the heat of the kiln slag, the high-temperature kiln slag is changed into the secondary high-temperature kiln slag at about 400 DEG C, the cooling air is changed into high-temperature air, the high-temperature air is discharged from the primary kiln slag conveyor 7 through the high-temperature air outlet 8, the high-temperature air is dusted by the dry dust collector 27, and then is sent into the rotary kiln 1 by the combustion-supporting fan 28 through the combustion-supporting air inlet 4 to support the combustion of the materials in the rotary kiln 1.

[0028] Reference Figure 1 The wet dust removal system 29 comprises a wet dust collector 291, a fan a 292 and a chimney a 293, the wet dust collector 291 is fixedly connected with the wet flue gas outlet 19 of the secondary kiln slag conveyor 17, the other end of the wet dust collector 291 is fixedly connected with the fan a 292, the other end of the fan a 292 is fixedly connected with the chimney a 293, the wet flue gas generated during the atomized water spraying cooling is led out from the wet flue gas outlet 19, is dusted by the wet dust collector 291, and then the treated flue gas is sent into the chimney a 293 by the fan a 292 to be exhausted.

[0029] Principle and advantages: First, the production raw materials such as blast furnace slag enter the system from the rotary kiln 1 inlet 2, and the production raw materials are treated at high temperature in the rotary kiln 1 to discharge the high-temperature kiln slag at about 950-1050℃ from the slag discharge port 5. The high-temperature kiln slag enters the tail of the first kiln slag conveyor 7 from the slag inlet 6, and the first kiln slag conveyor 7 transports the high-temperature kiln slag to the head. In the process of transporting the high-temperature kiln slag, the membrane water cooling wall installed on the upper part of the first kiln slag conveyor 7 absorbs the radiant heat of the high-temperature kiln slag, and transports the high-temperature water generated by the absorbed heat to the flue gas waste heat boiler 24. The flue gas waste heat boiler 24 takes heat, and the low-temperature water after taking heat is sent back to the membrane water cooling wall by the flue gas waste heat boiler 24. In the process of transporting the high-temperature kiln slag, the combustion-supporting fan 28 draws cold air into the first kiln slag conveyor 7 from the head adjustment air door 9 of the first kiln slag conveyor 7, and cools the high-temperature kiln slag in the process of transporting. After the cooling air absorbs the heat of the kiln slag, the high-temperature kiln slag is converted into the next high-temperature kiln slag at about 400℃, and the cooling air is converted into high-temperature air, which is discharged from the first kiln slag conveyor 7 through the high-temperature air outlet 8, and is sent to the rotary kiln 1 through the combustion-supporting air inlet 4 after dust removal by the dry dust collector 27 to support combustion of the materials in the rotary kiln 1. The air baffle 22 can effectively prevent air in the space on both sides from leaking, and the rotary kiln 1 has high burnout air temperature. The burnout air is discharged from the burnout air outlet 3, enters the flue gas waste heat boiler 24 from the flue gas inlet 26, is discharged from the flue gas waste heat boiler after waste heat recovery, and is then treated by the flue gas post-processing system 30 and discharged. The next high-temperature kiln slag is discharged from the first kiln slag conveyor 7 through the discharge port a10, enters the slag block sieve 11, and the screen 12 in the slag block sieve 11 can sieve the kiln slag of different particle sizes. The large slag cannot pass through the screen 12, and is discharged from the slag block sieve 11 through the large slag outlet 13 on the upper side of the screen 12, and is finally stored in the large slag bin 15. The fine slag can pass through the screen 12, is discharged from the slag block sieve 11 through the fine slag outlet 14, enters the second kiln slag conveyor 17 through the fine slag inlet 16, and the second kiln slag conveyor 17 transports the next high-temperature kiln slag to the head. In the process of transporting, the atomizing cooler 18 installed on the upper part of the second kiln slag conveyor 17 shell sprays atomizing water to the next high-temperature kiln slag, the temperature is further reduced, and the kiln slag temperature is converted to below 100℃. The wet flue gas generated during the atomizing water cooling is discharged from the wet flue gas outlet 19, is dusted by the wet dust collector 291, and the treated flue gas is sent to the chimney a293 by the fan a292 for discharge. The amount of water sprayed by the atomizing cooler 18 can be adjusted according to the temperature of the transported kiln slag. The air baffle 22 installed in the second kiln slag conveyor 17 can effectively prevent air in the space on both sides from leaking, and isolate the wet flue gas in the space on the side of the wet flue gas outlet 19. The kiln slag is continuously transported forward through the second kiln slag conveyor 17, and is finally stored in the fine slag bin 21 through the discharge port b20;

[0030] The high-temperature kiln slag cooling device can effectively complete cooling, waste heat utilization, conveying and storage of high-temperature kiln slag, and has the advantages of high efficiency, reliability, energy saving, water saving, environmental protection, full sealing and automation.

Claims

1. A waste heat recovery system for dry cooling of kiln slag, comprising a rotary kiln (1), characterized in that: One end of the rotary kiln (1) is fixedly connected to a primary slag conveyor (7) through the slag inlet (6). The primary slag conveyor (7) has a high-temperature air outlet (8) at its upper end. The end of the primary slag conveyor (7) away from the slag inlet (6) has an adjustable air inlet (9) and a discharge outlet a (10). The other end of the discharge outlet a (10) is equipped with a secondary slag conveyor (17). The secondary slag conveyor (17) has a wet flue gas outlet (19) at its upper end. The upper part of the first-stage slag conveyor (17) is symmetrically equipped with atomizing coolers (18). The second-stage slag conveyor (17) is provided with a discharge port b (20) at one end away from the fine slag inlet (16). The other end of the discharge port b (20) is fixedly connected to a fine slag bin (21). A wet dust removal system (29) is installed at one end of the wet flue gas outlet (19) at the upper end of the second-stage slag conveyor (17). An absorption module (23) is provided at the upper part of the first-stage slag conveyor (7).

2. The waste heat recovery system for dry cooling of kiln slag according to claim 1, characterized in that: The rotary kiln (1) has a feed inlet (2) and a burnout air outlet (3) at one end, and a slag discharge outlet (5) and a combustion air inlet (4) at the other end. The slag discharge outlet (5) is fixedly connected to the primary kiln slag conveyor (7) through a slag inlet (6).

3. The waste heat recovery system for dry cooling of kiln slag according to claim 1, characterized in that: The other end of the discharge port a (10) is fixedly connected to a slag block screener (11). The slag block screener (11) is equipped with a screen (12). The bottom of the slag block screener (11) is provided with a fine slag outlet (14). The upper end of the secondary kiln slag conveyor (17) is fixedly connected to a fine slag inlet (16). The fine slag inlet (16) is fixedly connected to the fine slag outlet (14).

4. The waste heat recovery system for dry cooling of kiln slag according to claim 3, characterized in that: The slag separator (11) is provided with a large slag outlet (13) at the bottom, and a large slag bin (15) is fixedly connected to the bottom end of the large slag outlet (13).

5. The waste heat recovery system for dry cooling of kiln slag according to claim 1, characterized in that: A baffle device (22) is installed between the atomizing cooler (18) and the fine slag inlet (16) inside the secondary slag conveyor (17) and between the high-temperature air outlet (8) and the slag inlet (6) inside the primary slag conveyor (7).

6. The waste heat recovery system for dry cooling of kiln slag according to claim 1, characterized in that: The upper part of the primary kiln slag conveyor (7) is equipped with a flue gas waste heat boiler (24). The flue gas waste heat boiler (24) has a flue gas outlet (25) and a flue gas inlet (26) at both ends. The burnout air outlet (3) of the rotary kiln (1) is connected to the flue gas inlet (26) of the flue gas waste heat boiler (24). The flue gas outlet (25) of the flue gas waste heat boiler (24) is fixedly connected to a flue gas post-treatment system (30).

7. The waste heat recovery system for dry cooling of kiln slag according to claim 1, characterized in that: A dry dust collector (27) is fixedly connected to the other end of the high-temperature air outlet (8), and a combustion-supporting fan (28) is installed at the other end of the dry dust collector (27). The combustion-supporting fan (28) is connected to the combustion-supporting air inlet (4) at one end of the rotary kiln (1).

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