Pellet roasting preheating mechanism based on waste heat utilization

Abstract

The utility model relates to the field of energy conservation and resource utilization, and discloses a pellet roasting preheating mechanism based on waste heat utilization, which comprises a pellet furnace, an air outlet pipe is fixedly connected to the top of the pellet furnace, a heat exchange assembly is arranged in the air outlet pipe, and a purification assembly is arranged at one end, far away from the pellet furnace, of the air outlet pipe. The heat exchange assembly comprises an air blower, the air blower is arranged on one side of the pelletizing furnace, the output end of the air blower is fixedly connected with an air inlet pipe, and the end, away from the air blower, of the air inlet pipe is fixedly connected with a spiral pipe. According to the utility model, through the design of the heat exchange assembly, before the gas is conveyed into the pelletizing furnace, the gas is subjected to heat exchange with the waste gas, and the waste heat of the waste gas is utilized to preheat the gas. The spiral pipe is arranged in the gas outlet pipe, the spiral structure of the spiral pipe increases the contact area with waste gas, and the heat exchange efficiency is greatly improved, so that heat energy in the waste gas is fully utilized, the energy consumption is reduced, and the energy-saving effect of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of energy saving and resource utilization especially relates to the briquetting preheating mechanism based on waste heat utilization. BACKGROUND

[0002] In the steel production process, the sintering of pellets is a crucial process step, and its main purpose is to prepare iron ore powder into high-strength and good-permeability pellets through a series of processes such as balling, drying, and high-temperature baking, to meet the demand for high-quality raw materials in blast furnace smelting. In the sintering process of pellets, the pellet furnace, as the key equipment, undertakes the core task of heating and sintering the pellets. However, a large amount of high-temperature exhaust gas is generated during the sintering process, and these exhaust gases contain rich heat energy resources. If they can be reasonably recovered and utilized, it will significantly improve the energy utilization efficiency and reduce the production cost.

[0003] However, the existing pellet sintering equipment still has some deficiencies in technical application. On the one hand, the heat in the high-temperature exhaust gas often cannot be fully utilized, and a large amount of waste heat is directly discharged into the environment, causing waste of energy; on the other hand, the exhaust gas purification system of the existing equipment has a complex structure, low running efficiency, and inconvenient maintenance, which can easily lead to unstable operation of the equipment. In addition, the spray water in the spray tower lacks effective recycling design after absorbing the heat of the exhaust gas, and cannot further play the role of heat energy, so the overall energy utilization rate is low.

[0004] Therefore, the briquetting preheating mechanism based on waste heat utilization is proposed to solve the above problems. CONTENT OF THE UTILITY MODEL

[0005] In order to make up for the above shortcomings, the utility model provides a briquetting preheating mechanism based on waste heat utilization, aiming to improve the low waste heat recovery efficiency, poor exhaust gas purification effect, and cumbersome equipment maintenance in the existing pellet baking process.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme: the briquetting preheating mechanism based on waste heat utilization, including a pellet furnace, the pellet furnace is fixedly connected with an air outlet pipe at the top, the air outlet pipe is internally provided with a heat exchange assembly, and the air outlet pipe is provided with a purification assembly away from the pellet furnace at one end;

[0007] The heat exchange assembly includes a blower, the blower is arranged on one side of the pellet furnace, the output end of the blower is fixedly connected with an air inlet pipe, the air inlet pipe is fixedly connected with a spiral pipe away from the blower at one end, the spiral pipe is arranged inside the pellet furnace away from the air inlet pipe at one end, and the spiral pipe is arranged inside the air outlet pipe.

[0008] As a further description of the above technical scheme:

[0009] The purification assembly includes a spray tower, the spray tower is fixedly connected outside the air outlet pipe away from the pelletizing furnace, one side of the spray tower is provided with a water pump one and a water pump two, the water pump one input end is fixedly connected with a connecting pipe, the connecting pipe is fixedly connected with a preheating box away from the water pump one end, the water pump one output end is fixedly connected with a water inlet pipe, the water inlet pipe is fixedly connected with a spray head away from the water pump one end and penetrates the spray tower, the water pump two input end is connected through a hollow pipe at the bottom of the spray tower, the water pump two output end is fixedly connected with a water outlet pipe, the inside of the spray tower is provided with a filter assembly.

[0010] As a further description of the above technical solutions:

[0011] The filter assembly includes a sealed box, the sealed box is fixedly connected inside the spray tower, the sealed box is slidably connected with a filter plate, the filter plate is fixedly connected with two plug blocks outside and is symmetrically distributed, the sealed box is fixedly connected with a fixed block corresponding to the plug block outside, and the fixed block is provided with a locking part inside.

[0012] As a further description of the above technical solutions:

[0013] The locking part includes an outer shell, the outer shell is fixedly connected inside the fixed block, the fixed block is fixedly connected with an inner shell, the inner shell is provided with an L-shaped groove outside, the inner shell is slidably connected with a plug pin inside, the plug pin is provided with a spring outside, the plug pin is fixedly connected with a pad plate outside, and the pad plate is fixedly connected with an L-shaped rod outside.

[0014] As a further description of the above technical solutions:

[0015] The spray tower is fixedly connected with an exhaust pipe at the top, and the water outlet pipe is arranged above the preheating box away from the water pump two end.

[0016] As a further description of the above technical solutions:

[0017] The plug block is slidably connected inside the fixed block, and the plug pin is inserted into the plug block.

[0018] As a further description of the above technical solutions:

[0019] The L-shaped rod is slidably connected inside the L-shaped groove, and the pad plate is slidably connected inside the inner shell.

[0020] As a further description of the above technical solutions:

[0021] One end of the spring is fixedly connected at the top of the pad plate, and the other end of the spring is in abutment with the inner wall of the inner shell.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the utility model, before conveying the gas in the pelletizing furnace, the gas is first exchanged with the waste gas, and the waste heat of the waste gas is used to preheat the gas.

[0024] 2. In the utility model, the spraying water in the spraying tower is not only effectively purified of the dust, particulate matter and part of harmful gas in the waste gas, but also flows back to the preheating box after filtration by the filter assembly, and the waste gas is preheated by the increased temperature.

[0025] 3. In the utility model, the filter plate in the filter assembly is fixed by the cooperation of the plug and the fixed block, and the disassembly and replacement process is simple and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a three-dimensional schematic view of the pellet baking preheating mechanism based on waste heat utilization;

[0027] Figure 2 It is a structure schematic view of the gas outlet pipe section of the pellet baking preheating mechanism based on waste heat utilization;

[0028] Figure 3 It is a structure schematic view of the spraying tower section of the pellet baking preheating mechanism based on waste heat utilization;

[0029] Figure 4 It is Figure 3 the enlarged schematic view of A in the figure;

[0030] Figure 5 It is Figure 4 the enlarged schematic view of B in the figure.

[0031] LEGEND:

[0032] 1, inlet pipe; 2, air blower; 3, air inlet pipe; 4, air outlet pipe; 5, pellet furnace; 6, preheating box; 7, connecting pipe; 8, water outlet pipe; 9, water pump I; 10, water pump II; 11, sealing box; 12, spray tower; 13, exhaust pipe; 14, spiral pipe; 15, spray head; 16, shell; 17, plug; 18, filter plate; 19, L-shaped groove; 20, inner shell; 21, bolt; 22, spring; 23, pad; 24, fixed block; 25, L-shaped rod. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0034] Referring to Figures 1-3 An embodiment provided by the utility model: a pellet baking and preheating mechanism based on waste heat utilization, comprising a pellet furnace 5, the top of the pellet furnace 5 is fixedly connected with an air outlet pipe 4, the air outlet pipe 4 is internally provided with a heat exchange assembly, and the air outlet pipe 4 is provided with a purification assembly at the end away from the pellet furnace 5;

[0035] The heat exchange assembly includes a blower 2, which is located on one side of the pelletizing furnace 5. An inlet pipe 3 is fixedly connected to the output end of the blower 2. A spiral pipe 14 is fixedly connected to the end of the inlet pipe 3 away from the blower 2. The end of the spiral pipe 14 away from the inlet pipe 3 is located inside the pelletizing furnace 5, and the spiral pipe 14 is located inside the outlet pipe 4. The pelletizing furnace 5 is used for the pelleting process and is the core part of the entire unit. It heats and sinters the ore pellets to improve their strength and provide suitable pellets for subsequent smelting. The outlet pipe 4 is located at the top of the pelletizing furnace 5 and is used to discharge the waste gas generated inside the furnace, providing conditions for subsequent waste heat utilization. The heat exchange assembly transfers heat from the waste gas to the gas entering the pelletizing furnace 5 through heat exchange, utilizing the waste heat of the waste gas to heat the air or other gases entering the furnace 5, thereby improving energy efficiency. A purification assembly is located at the end of the outlet pipe 4 away from the pelletizing furnace 5 and is used to remove harmful substances or dust from the waste gas, ensuring that the emitted gas meets environmental protection standards and avoiding environmental pollution. Blower 2 is responsible for drawing in air or other gases and delivering them to pelletizing furnace 5 through intake pipe 3, providing the power for gas flow and helping to maintain air circulation within the furnace. Intake pipe 3 is used to deliver the gas output from blower 2 to spiral tube 14, and finally into the pelletizing furnace 5. Spiral tube 14 transfers heat from the exhaust gas to the gas flowing in intake pipe 3 through heat exchange, using the high temperature of the exhaust gas flow to heat the gas in intake pipe 3 and ensuring efficient heat transfer. Its spiral shape allows for better heat exchange between the gas inside and the exhaust gas.

[0036] Reference Figures 1-5The purification assembly comprises a spray tower 12 fixedly connected outside the gas outlet pipe 4 away from the pelletizing furnace 5, a water pump I 9 and a water pump II 10 arranged on one side of the spray tower 12, a connecting pipe 7 fixedly connected to an input end of the water pump I 9, a preheating box 6 fixedly connected to an end of the connecting pipe 7 away from the water pump I 9, an input end of the water pump II 10 connected to a bottom of the spray tower 12 through a hollow pipe, an output end of the water pump II 10 fixedly connected to a water outlet pipe 8, a filter assembly arranged inside the spray tower 12, an exhaust pipe 13 fixedly connected to a top of the spray tower 12, and the water outlet pipe 8 arranged above the preheating box 6 at an end away from the water pump II 10. The spray tower 12 is used for spray treatment of the waste gas, and the waste gas is fully contacted with the spray water to remove particulate matters, dust and part of harmful gases in the waste gas. The water pump I 9 is used for pumping water from the preheating box 6 to the spray head 15 inside the spray tower 12 through the water inlet pipe 1 to realize spray purification of the waste gas. The water pump II 10 is used for pumping the filtered waste water after spraying back to the preheating box 6 through the water outlet pipe 8 to realize recycling of the spray water. After the spray water is sprayed, the temperature of the spray water is increased through heat exchange with the waste gas, and the spray water is sent back to the preheating box 6 again, so that the pellets can be put into the preheating box 6 to be preheated, the heat is more reasonably utilized, and the waste of heat energy is prevented. The spray water needs to be replaced after multiple recycling to ensure the purification effect of the waste gas. The preheating box 6 is used for storing the recycled water, and the recycled spray water can be used for preheating of the pellets. The water inlet pipe 1 is used for conveying the water pumped by the water pump I 9 to the spray head 15 inside the spray tower 12 to provide a water source for spray of the waste gas. The spray head 15 is contacted with the waste gas through spraying of fine water flow to absorb heat, dust and part of harmful substances in the waste gas to complete purification. The hollow pipe is used for collecting the filtered spray water at the bottom of the spray tower 12 and conveying the filtered spray water to the water pump II 10 to be returned to the preheating box 6 through the water outlet pipe 8 for recycling. The filter assembly is used for filtering the spray water after spraying to prevent pollution of the recycled water. The exhaust pipe 13 is used for discharging the gas purified after spraying to ensure that the discharged gas meets the environmental protection requirements. The connecting pipe 7 is used for conveying the water in the preheating box 6 to the water pump I 9 to provide a water source for the spray purification process.

[0037] With reference to Figure 1 , Figure 3 , Figure 4 and Figure 5 , the filter assembly comprises a sealing box 11 fixedly connected inside the spray tower 12, a filter plate 18 slidably connected inside the sealing box 11, two plug blocks 17 fixedly connected outside the filter plate 18 and symmetrically distributed, a fixed block 24 fixedly connected outside the sealing box 11 and corresponding to the plug blocks 17, and a locking part arranged inside the fixed block 24.

[0038] With reference to Figure 3、 Figure 4 and Figure 5 The locking component comprises an outer shell 16 fixedly connected inside the fixed block 24, an inner shell 20 fixedly connected inside the fixed block 24, an L-shaped slot 19 formed on the outer side of the inner shell 20, a bolt 21 slidably connected inside the inner shell 20, a spring 22 sleeved on the outer side of the bolt 21, a backing plate 23 fixedly connected on the outer side of the bolt 21, an L-shaped rod 25 fixedly connected on the outer side of the backing plate 23, an insertion block 17 slidably connected inside the fixed block 24, the bolt 21 inserted inside the insertion block 17, the L-shaped rod 25 slidably connected inside the L-shaped slot 19, the backing plate 23 slidably connected inside the inner shell 20, one end of the spring 22 fixedly connected on the top of the backing plate 23, and the other end of the spring 22 abutting against the inner wall of the inner shell 20. The outer shell 16 is used for bearing various parts inside it to ensure normal operation. The inner shell 20 is used for providing a sliding track for the bolt 21. The backing plate 23 is used for connecting the L-shaped rod 25 and bearing the spring 22. The L-shaped rod 25 is used for being clamped inside the L-shaped slot 19 by rotating the bolt 21 after the bolt 21 is pulled out of the insertion block 17, so that the L-shaped rod 25 is not pulled all the time, facilitating replacement of the filter plate 18. The fixed block 24 is used for fixing the locking component and cooperating with the insertion block 17 to fix the insertion block 17 inside the fixed block 24, so as to fix the filter plate 18.

[0039] Working principle: The pelletizing furnace 5 generates high-temperature exhaust gas during the firing process. These exhaust gases are discharged through the exhaust pipe 4 located at the top of the pelletizing furnace 5. The exhaust gas first exchanges heat with the heat exchange assembly arranged inside the exhaust pipe 4. The air or other gas is sucked in by the air blower 2 in the heat exchange assembly and is delivered to the spiral pipe 14 through the air inlet pipe 3. The spiral pipe 14 is arranged inside the exhaust pipe 4 and is in full contact with the exhaust gas, transferring the heat in the exhaust gas to the gas flow, thereby heating the gas entering the pelletizing furnace 5 and realizing waste heat recovery. The spiral structure design of the spiral pipe 14 increases the contact area with the exhaust gas and improves the heat exchange efficiency.

[0040] The waste gas after heat exchange continues to flow away from the one end of the pelletizing furnace 5 of the gas outlet pipe 4, and enters the spray tower 12. The spray tower 12 sprays and purifies the waste gas through the spray head 15 arranged inside. The water pump one 9 extracts the spray water from the preheating box 6, and delivers the spray water to the spray head 15 through the water inlet pipe 1, sprays the fine water flow, and fully contacts with the waste gas to absorb the dust, particulate matter and part of harmful gas in the waste gas. The spray water after spraying is filtered through the filter plate 18, and finally falls into the bottom of the spray tower 12, so that the impurities and particulate matter cannot enter the preheating box 6, the water quality is ensured, and then is delivered to the water pump two 10 through the hollow pipe. The water pump two 10 returns the filtered spray water to the preheating box 6 through the water outlet pipe 8, and completes the recycling of the spray water. After the spray water absorbs the waste heat of the waste gas in the spraying process, the temperature of the spray water is increased, and after the spray water is returned to the preheating box 6 again, the spray water can be used for preheating the pellets, so that the heat energy utilization efficiency is further improved. After the spray water is recycled for many times, the spray water needs to be replaced, so that the filtering effect on the waste gas is ensured. The filter plate 18 in the filter assembly can be easily disassembled through the cooperation of the plug block 17 and the fixing block 24. When the filter plate 18 is replaced, the plug 21 is pulled out of the plug block 17, and then the L-shaped rod 25 is clamped in the L-shaped slot 19 by rotating the plug 21, so that the plug 21 is self-locked, and the plug 21 does not need to be pulled all the time, so that the maintenance is facilitated. The waste gas after spraying and purification is finally discharged through the exhaust pipe 13 at the top of the spray tower 12, so that the discharged gas meets the environmental protection standard.

[0041] Finally, it should be noted that: the above only describes the preferred embodiments of the present application, and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the protection scope of the present application.

Claims

1. A mechanism for preheating of pellets for roasting based on waste heat utilization, comprising a pellet furnace (5), characterized in that: The pellet furnace (5) top fixedly connected with the gas pipe (4), the gas pipe (4) inside is provided with heat exchange component, the gas pipe (4) is away from the pellet furnace (5) one end is provided with purification component; The heat exchange component includes a blower (2), the blower (2) is provided in the pellet furnace (5) one side, the blower (2) output fixedly connected with the inlet pipe (3), the inlet pipe (3) is away from the blower (2) one end fixedly connected with the spiral pipe (14), the spiral pipe (14) is away from the inlet pipe (3) one end is arranged in the pellet furnace (5) inside, the spiral pipe (14) is arranged in the gas pipe (4) inside.

2. The mechanism for preheating of pellets for indurating by utilizing residual heat according to claim 1, characterized in that: The purification component includes a spray tower (12), the spray tower (12) outside fixedly connected in the gas pipe (4) is away from the pellet furnace (5) one end, the spray tower (12) one side is provided with water pump one (9) and water pump two (10), the water pump one (9) input fixedly connected with the connecting pipe (7), the connecting pipe (7) is away from the water pump one (9) one end fixedly connected with the preheating box (6), the water pump one (9) output fixedly connected with the inlet pipe (1), the inlet pipe (1) is away from the water pump one (9) one end penetrates the spray tower (12) and is fixedly connected with the shower head (15), the water pump two (10) input is connected in the spray tower (12) bottom through the hollow tube, the water pump two (10) output fixedly connected with the outlet pipe (8), the spray tower (12) inside is provided with filter component.

3. The mechanism for preheating of pellets for indurating according to claim 2, characterized in that: The filter component includes a sealed box (11), the sealed box (11) is fixedly connected in the spray tower (12), the sealed box (11) inside is slidably connected with filter plate (18), the filter plate (18) outside fixedly connected with two plug blocks (17) and is symmetrically distributed, the sealed box (11) outside fixedly connected with the fixed block (24) corresponding with the plug block (17), the fixed block (24) inside is provided with locking component.

4. The mechanism for preheating of pellets for indurating according to claim 3, characterized in that: The locking component includes an outer shell (16), the outer shell (16) outside fixedly connected in the fixed block (24) inside, the fixed block (24) inside fixedly connected with the inner shell (20), the inner shell (20) outside is provided with L-shaped groove (19), the inner shell (20) inside is slidably connected with the latch (21), the latch (21) outside is sleeved with spring (22), the latch (21) outside fixedly connected with the backing plate (23), the backing plate (23) outside fixedly connected with L-shaped rod (25).

5. The mechanism for preheating of pellets for indurating according to claim 2, characterized in that: The spray tower (12) top fixedly connected with the exhaust pipe (13), the outlet pipe (8) is away from the water pump two (10) one end is arranged above the preheating box (6).

6. The mechanism for preheating of pellets for indurating according to claim 4, characterized in that: The plug block (17) is slidably connected in the fixed block (24) inside, the latch (21) is inserted in the plug block (17) inside.

7. The mechanism for preheating of pellets for indurating according to claim 4, characterized in that: The L-shaped rod (25) is slidably connected in the L-shaped groove (19) inside, the backing plate (23) is slidably connected in the inner shell (20) inside.

8. The mechanism for preheating of pellets for indurating according to claim 4, characterized in that: One end of the spring (22) is fixedly connected to the top of the backing plate (23), and the other end of the spring (22) is in abutment with the inner wall of the inner shell (20).

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