Pellet kiln flue gas dust removal and cooling system

Abstract

The present invention provides a pelletizing kiln flue gas dust removal and cooling system, comprising a dust collector, a cooling pipe, a steam collection assembly and a flue gas cooling assembly; the dust collector has a flue gas duct arranged at the bottom of the side, an exhaust duct arranged at the top, and a filter bag arranged along the flue gas flow direction; the steam collection assembly is used to collect water vapor from the wet material belt transfer station; the two ends of the cooling pipe are respectively connected to the dust collector and the steam collection assembly, and the air outlet end of the cooling pipe is located below the filter bag; the flue gas cooling assembly is used to cool the flue gas duct. The pelletizing kiln flue gas dust removal and cooling system provided by the present invention utilizes the water vapor accumulated on the wet material belt transfer station, reduces the total amount of water vapor at the wet material belt transfer station, improves visibility, and facilitates staff to clearly observe the transfer situation and material situation of the wet material belt transfer station; it not only improves the utilization rate of water vapor, but also reduces the temperature of the flue gas, thereby reducing the temperature of the dust collector.

Description

Technical Field

[0001] The invention belongs to the technical field of dust collectors, and in particular relates to a pelletizing kiln flue gas dust removal and cooling system. Background Art

[0002] A pelletizing kiln is a device used to calcine iron ore powder, moisten it, and then calcine it into pellets. The moistened material is typically transported to the pelletizing line via a wet material conveyor transfer station. Dust collectors are installed at the head and tail of the kiln to remove dust from the flue gas generated by the kiln. The dust collectors are equipped with filter bags that capture fine, dry, and non-fibrous dust in the flue gas.

[0003] However, the flue gas output from the pelletizing kiln is too hot. After entering the dust collector, the dust collector temperature exceeds 240°C. The maximum heat resistance temperature of the filter bags is 220°C, which exceeds the heat resistance of the filter bags, affecting the performance and service life of the filter bags. Therefore, it is necessary to frequently open the kiln head and tail doors to draw in cold air to cool the dust collector. Air cooling not only has a poor cooling effect, but frequent ventilation increases cooling costs, affecting production progress. In addition, the humidified materials on the wet material belt transfer station are affected by the high temperature and release a large amount of water vapor, resulting in low visibility at the wet material belt transfer station, affecting the observation and judgment of the staff, posing certain safety risks, and the water vapor cannot be reused, resulting in waste. Summary of the Invention

[0004] The embodiment of the present invention provides a pelletizing kiln flue gas dust removal and cooling system, which aims to solve the problems in the prior art of excessively high temperature entering the dust collector, affecting the flue gas dust removal effect, and excessive water vapor on the wet material belt transfer station affecting visibility.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a pelletizing kiln flue gas dust removal and cooling system, comprising:

[0006] The dust collector has a flue gas duct arranged at the bottom of the side, an exhaust duct arranged at the top, and filter bags arranged along the flow direction of the flue gas;

[0007] Steam collection assembly for collecting water vapor at wet material belt transfer stations;

[0008] a cooling pipe, both ends of which are connected to the dust collector and the steam collection assembly, and the air outlet end of the cooling pipe is located below the filter bag; and

[0009] The flue gas cooling component is used to cool the flue gas duct.

[0010] In one possible implementation, the cooling pipe includes a first cooling pipe, a flow regulating pipe, and a second cooling pipe connected in sequence along the steam flow direction, the air inlet of the first cooling pipe is connected to the steam collection assembly, and the air outlet of the second cooling pipe is connected to the dust collector.

[0011] In a possible implementation, a coarse adjustment valve and a fine adjustment valve are sequentially provided on the flow regulating pipe along the steam flow direction.

[0012] In a possible implementation, a temperature display screen is provided on the dust collector, and the coarse adjustment valve and the fine adjustment valve are respectively communicatively connected to the temperature display screen.

[0013] In one possible implementation, the steam collection assembly includes:

[0014] a collecting cabin, provided on the wet material belt transfer station and forming a collecting port, wherein the collecting port is communicated with the cooling pipe; and

[0015] The exhaust fan is arranged in the collecting port.

[0016] In one possible implementation, the flue gas cooling assembly includes:

[0017] A heat exchange box, wherein the flue gas duct runs through the heat exchange box, cooling water is contained in the heat exchange box, and a water inlet that can be blocked is provided on the top of the heat exchange box;

[0018] an air intake pipe, passing through the side wall of the heat exchange box, the air intake pipe being connected to the cooling pipe; and

[0019] The air outlet pipe is arranged on the top of the heat exchange box.

[0020] In one possible implementation, the pelletizing kiln flue gas dust removal and cooling system further includes an ORC generator set, wherein the air inlet end of the ORC generator set is connected to a liquid inlet pipe, and the liquid outlet end of the ORC generator set is connected to a liquid outlet pipe, the liquid inlet pipe and the liquid outlet pipe are connected through a heat exchange pipe to form a closed loop through which a heat exchange medium flows, and the heat exchange pipe is spirally sleeved on the outer circumference of the air outlet pipe.

[0021] In a possible implementation, a motor is provided inside the air extraction duct, an output end of the motor is connected to a fan blade, and the ORC generator set is electrically connected to the motor.

[0022] In a possible implementation, a spray head is further provided inside the heat exchange box, and the spray direction of the spray head is toward the flue gas duct;

[0023] A water pump is installed outside the heat exchange box. The water pump is connected to the heat exchange box and the spray head through pipelines. The water pump is used to deliver the cooling water to the spray head.

[0024] In a possible implementation, the air intake pipe is arranged to be inclined downward.

[0025] Compared with the prior art, the pelletizing kiln flue gas dust removal and cooling system provided by the present invention has the following beneficial effects:

[0026] (1) The water vapor accumulated on the wet material belt transfer station is utilized, which reduces the total amount of water vapor at the wet material belt transfer station, improves visibility, and facilitates staff to clearly observe the transfer status and material status of the wet material belt transfer station;

[0027] (2) The water vapor from the wet material belt transfer station is introduced into the dust collector for heat exchange with the flue gas, which not only improves the utilization rate of water vapor, saves energy and protects the environment, but also reduces the temperature of the flue gas, thereby reducing the temperature of the dust collector and the risk of overheating and damage to the filter bags;

[0028] (3) The steam collection component absorbs water vapor, increasing the absorption efficiency. While absorbing water vapor, it also inhales air. The air and water vapor are mixed and passed into the dust collector, thereby improving the cooling effect.

[0029] (4) After the flue gas is cooled by the flue gas cooling component, it exchanges heat with water vapor in the dust collector. The two cooling processes greatly reduce the temperature of the flue gas, reduce the high temperature impact on the dust collector, and increase the service life of the dust collector;

[0030] (5) The water vapor from the wet material belt transfer station is introduced into the dust collector to cool the flue gas. The contact area between the water vapor and the flue gas is large, and the cooling effect is good. There is no need to frequently open the kiln door to inhale cold air, which reduces the air volume loss.

[0031] (6) Water vapor enters the dust collector and mixes with the flue gas, absorbing the heat of the flue gas, reducing the flue gas entry temperature, and turning the fine dust in the flue gas into large particles, thereby improving the dust collection effect of the dust collector;

[0032] (7) The flue gas is mixed with water vapor and humidified, which reduces the flue gas velocity, prolongs the residence time of the flue gas in the filter bag, and improves the dust removal effect;

[0033] (8) Water vapor changes the physical state of dust, increases the dust particle size and viscosity, and facilitates cleaning of the dust collector after dust removal;

[0034] (9) The flue gas temperature is lowered by introducing steam into the dust collector, thus reducing costs. After the flue gas is introduced, the overall temperature does not exceed 220 degrees, which is within the tolerance range of the filter bag, reducing the risk of dust collector damage. The steam can be discharged together with the flue gas after dust removal and will not stay inside;

[0035] (10) The introduction of water vapor makes the overall temperature inside the dust collector higher than 100 degrees. The water vapor inside the dust collector will not liquefy and condensation will not occur, thereby improving the performance of the dust collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This is a schematic diagram of the main structure of the pelletizing kiln flue gas dust removal and cooling system provided in Example 1 of the present invention;

[0038] Figure 2 This is a cross-sectional view of the air extraction pipeline used in Example 1 of the present invention;

[0039] Figure 3 This is a schematic structural diagram of a flue gas cooling assembly used in Example 1 of the present invention;

[0040] Figure 4 This is a schematic structural diagram of a flue gas cooling assembly used in the second embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the assembly of the generator set and the air outlet pipe used in the first embodiment of the present invention.

[0042] Description of reference numerals:

[0043] 1. Dust collector; 11. Flue gas duct; 12. Exhaust duct; 13. Temperature display screen; 14. Motor; 141. Fan blades;

[0044] 2. Cooling pipe; 21. First cooling pipe; 22. Flow regulating pipe; 221. Coarse adjustment valve; 222. Fine adjustment valve; 23. Second cooling pipe;

[0045] 3. Steam collection assembly; 31. Collection chamber; 32. Collection port; 33. Exhaust fan;

[0046] 4. Flue gas cooling assembly; 41. Heat exchange box; 411. Water inlet; 42. Air inlet pipe; 43. Air outlet pipe; 44. Sprinkler head; 45. Water pump; 46. Liquid return pipe;

[0047] 5. Generator set;

[0048] 6. Liquid inlet pipe;

[0049] 7. Heat exchange tube;

[0050] 8. Liquid outlet pipe;

[0051] 9. Wet material belt loading station. DETAILED DESCRIPTION

[0052] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0053] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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 orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0054] It should also be noted that, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," "fixed," and "set" should be understood broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and may encompass internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, "plurality" and "several" mean two or more, unless otherwise specifically defined.

[0056] Please also refer to Figures 1 to 5 , the pelletizing kiln flue gas dust removal and cooling system provided by the present invention is now described. The pelletizing kiln flue gas dust removal and cooling system includes a dust collector 1, a cooling pipe 2, a steam collection component 3 and a flue gas cooling component 4. The dust collector 1 has a flue gas duct 11 arranged at the bottom of the side, an exhaust duct 12 arranged at the top, and a filter bag (not shown in the figure) arranged along the flue gas flow direction; the steam collection component 3 is used to collect water vapor from the wet material belt transfer station 9 (not shown in the figure); the two ends of the cooling pipe 2 are respectively connected to the dust collector 1 and the steam collection component 3, and the air outlet end of the cooling pipe 2 is located below the filter bag; the flue gas cooling component 4 is used to cool the flue gas duct 11.

[0057] It should be noted that the flue gas flows from bottom to top. Since the flue gas duct 11 is arranged at the bottom of the side of the dust collector 1, and the exhaust duct 12 is arranged at the top of the dust collector 1, the flue gas flows from bottom to top in the dust collector 1.

[0058] It should be noted that the wet material belt transfer station 9 is a transfer station for transporting humidified materials. In this embodiment, high-temperature humidified materials are transported on the belt, and a large amount of water vapor is released from the hot and humid materials, affecting the visibility of the wet material belt transfer station 9.

[0059] It should be noted that the temperature of the water vapor released from the humidified material is 100°C, and the temperature of the water vapor entering the dust collector without any cooling is 240°C. It can be achieved by using the water vapor on the wet material belt transfer station 9 to cool the flue gas entering the dust collector 1.

[0060] The pelletizing kiln flue gas dust removal and cooling system provided in this embodiment has the following beneficial effects compared with the prior art:

[0061] (1) The water vapor accumulated on the wet material belt transfer station 9 is utilized, thereby reducing the total amount of water vapor at the wet material belt transfer station 9 and improving visibility, making it easier for staff to clearly observe the transfer status and material status of the wet material belt transfer station 9;

[0062] (2) The water vapor from the wet material belt transfer station 9 is introduced into the dust collector 1 for heat exchange with the flue gas, which not only improves the utilization rate of water vapor, saves energy and protects the environment, but also reduces the temperature of the flue gas, thereby reducing the temperature of the dust collector and reducing the risk of overheating and damaging the filter bags of the dust collector;

[0063] (3) The steam collecting component 3 absorbs water vapor, thereby increasing the absorption efficiency. While absorbing water vapor, air is inhaled, and the air and water vapor are mixed and passed into the dust collector 1, thereby improving the cooling effect.

[0064] (4) After the flue gas is cooled by the flue gas cooling component 4, it exchanges heat with water vapor in the dust collector 1. The two cooling operations greatly reduce the temperature of the flue gas, reduce the high temperature impact on the dust collector, and increase the service life of the dust collector;

[0065] (5) The water vapor from the wet material belt transfer station 9 is introduced into the dust collector 1 to cool the flue gas. The contact area between the water vapor and the flue gas is large, and the cooling effect is good. There is no need to frequently open the kiln door to inhale cold air, which reduces the air loss.

[0066] (6) Water vapor enters the dust collector and mixes with the flue gas, absorbing the heat of the flue gas, reducing the flue gas entry temperature, and turning the fine dust in the flue gas into large particles, thereby improving the dust collection effect of the dust collector;

[0067] (7) The flue gas is mixed with water vapor and humidified, which reduces the flue gas velocity, prolongs the residence time of the flue gas in the filter bag, and improves the dust removal effect;

[0068] (8) Water vapor changes the physical state of dust, increases the dust particle size and viscosity, and facilitates cleaning of the dust collector after dust removal;

[0069] (9) The flue gas temperature is lowered by introducing steam into the dust collector, thus reducing costs. After the flue gas is introduced, the overall temperature does not exceed 220 degrees, which is within the tolerance range of the filter bag, reducing the risk of dust collector damage. The steam can be discharged together with the flue gas after dust removal and will not stay inside;

[0070] (10) The introduction of water vapor makes the overall temperature inside the dust collector higher than 100 degrees. The water vapor inside the dust collector will not liquefy and condensation will not occur, thereby improving the performance of the dust collector.

[0071] In some embodiments, see Figure 1 The cooling pipe 2 includes a first cooling pipe 21, a flow regulating pipe 22, and a second cooling pipe 23 connected in sequence along the steam flow direction. The air inlet of the first cooling pipe 21 is connected to the steam collecting assembly 4, and the air outlet of the second cooling pipe 23 is connected to the dust collector 1. The first cooling pipe 21, the flow regulating pipe 22, and the second cooling pipe 23 are connected in sequence to deliver the water vapor from the wet material belt transfer station 9 to the dust collector 1. The first cooling pipe 21 inhales water vapor and air for mixing. The flow regulating pipe 22 can regulate the steam flow entering the second cooling pipe 23 to avoid steam waste and excessive steam introduction, which causes excessive water vapor in the dust collector 1 and affects dust removal. The first cooling pipe 21, the flow regulating pipe 22, and the second cooling pipe 23 are easy to assemble and simple to manufacture.

[0072] In a specific embodiment of the connection between the first cooling pipe 21, the flow regulating pipe 22, and the second cooling pipe 23, bolts are used to secure the first cooling pipe 21 to the flow regulating pipe 22, and the flow regulating pipe 22 to the second cooling pipe 23. Each connection has a heat-resistant sealing ring. The heat-resistant sealing ring improves the sealing between the pipes, thereby improving the sealing of the cooling pipe 2 as a whole, ensuring the transport of steam and air.

[0073] For details, see Figure 1 Flow control pipe 22 is equipped with a coarse control valve 221 and a fine control valve 222, arranged in sequence along the steam flow direction. Coarse control valve 221 allows for rapid flow adjustment, quickly adjusting the steam flow rate to the desired value. Fine control valve 222 is used to reduce errors and finely control the steam flow rate, achieving precise flow control. Operators can use coarse control valve 221 and fine control valve 222 to easily regulate steam flow and achieve precise control.

[0074] In some embodiments, see Figure 1 The dust collector 1 is provided with a temperature display screen 13, and the coarse adjustment valve 221 and the fine adjustment valve 222 are respectively communicated with the temperature display screen 13. During specific operation, the operator can read the temperature of the dust collector 1 through the temperature display screen 13, and then determine the required steam flow rate, and operate the coarse adjustment valve 221 and the fine adjustment valve 222 at the temperature display screen 13. The measured data is real-time. The coarse adjustment valve 221 and the fine adjustment valve 222 are respectively communicated with the temperature display screen 13, allowing the operator to observe and adjust in the same area, speeding up the efficiency and accuracy of the adjustment. The temperature changes caused by adjusting the steam flow rate can be clearly reflected in the reading changes on the temperature display screen 13, reducing operational errors.

[0075] In a specific implementation, the temperature display screen 13 is provided with two preset values ​​and three color changes. The first preset temperature value is 220°C, and the second temperature value is 100°C. When the temperature of the dust collector 1 exceeds the first preset value, the reading background changes to one color. After flow adjustment, when the temperature of the dust collector 1 is lower than the first preset value but higher than the second preset value, the background color of the temperature display screen 13 changes to the second color. When the temperature inside the dust collector 1 is lower than the second preset value, the coarse adjustment valve 221 and the fine adjustment valve 222 are closed, and the flow of water vapor into the dust collector 1 is stopped.

[0076] As a connection method in which the coarse adjustment valve 221 and the fine adjustment valve 222 are respectively communicated with the temperature display screen 13, the temperature display screen 13 has a control panel (not shown in the figure). The coarse adjustment valve 221 and the fine adjustment valve 222 are both provided with a rotating motor. When the temperature inside the temperature display screen 13 is higher than the first preset value, the control panel sends a signal to the rotating motor and controls the rotating motor to perform work to change the flow rate flowing through the flow regulating tube 22.

[0077] In some embodiments, see Figure 1 The steam collection component 3 includes a collection cabin 31 and an exhaust fan 33. The collection cabin 31 is arranged on the wet material belt transfer station 9 and forms a collection port 32, which is connected to the cooling pipe 2; the exhaust fan 33 is arranged in the collection port 32. The collection cabin 31 is arranged above the wet material belt transfer station 9 and covers the high-temperature wet material. The collection cabin 31 has a steam retention space (not shown in the figure). The water vapor escaping from the high-temperature wet material gathers in the steam retention space. At this time, the exhaust fan 33 works to suck the water vapor from the steam retention space into the collection port 32 and sends it to the first cooling pipe 21 to realize the collection of water vapor. The collection cabin can collect most of the water vapor, which speeds up the efficiency of steam extraction. The water vapor generated in the wet material belt transfer station 9 is sucked away by the exhaust fan 33, and the water vapor density is greatly reduced, which improves visibility and facilitates the staff to observe the situation in the wet material belt transfer station 9.

[0078] As an embodiment of the collecting port 32, the collecting port 32 is conical, and the cross-sectional area gradually decreases along the air inlet direction of the water vapor. The conical setting gathers the dispersed water vapor, reduces the distance between water molecules, and accelerates the flow rate of the water vapor; after entering the dust collector 1, it can exchange heat with the flue gas faster, thereby improving the cooling effect.

[0079] As an embodiment of the collecting port 32, the collecting port 32 has multiple collection ports spaced apart along the axis of the collecting chamber 31, and collects water vapor from multiple directions, thereby improving the collection effect and efficiency of water vapor, and facilitating the visualization and clarity inside the wet material belt transfer station 9.

[0080] As another embodiment of the steam collection assembly 3, a collection chamber 31 is mounted over a section of the wet material conveyor transfer station 9 and is sealed. The first cooling pipe 21 is connected to the collection chamber 31 through a collection port 32. A blower (not shown) is provided outside the collection chamber, and an exhaust fan 33 is provided at the collection port 32. When the exhaust fan 33 draws water vapor, the blower is activated to bring outside air into the collection chamber 31, maintaining the same air pressure inside and outside the collection chamber 31 and ensuring proper water vapor collection.

[0081] In some embodiments, see Figure 1 and Figure 3 The flue gas cooling assembly 4 includes a heat exchange box 41, an air inlet pipe 42 and an air outlet pipe 43. The flue gas duct 11 is arranged through the heat exchange box 41. Cooling water (not shown) is contained in the heat exchange box 41. A sealable water inlet 411 is provided on the top of the heat exchange box 41; the air inlet pipe 42 passes through the side wall of the heat exchange box 41, and the air inlet pipe 42 is connected to the cooling pipe 2; the air outlet pipe 43 is arranged on the top of the heat exchange box 41.

[0082] The flue gas cooling assembly 4 provided in this embodiment has a heat exchange box 41 for containing a heat exchange medium. The heat exchange medium exchanges heat with the flue gas in the flue gas duct 11 to achieve the purpose of cooling. The water inlet 411 is used to inject cooling water into the heat exchange box 41. The air inlet pipe 42 is connected to the cooling pipe 2. After the coarse adjustment valve 221 and the fine adjustment valve 222 are closed, the water vapor extracted from the wet material belt transfer station 9 enters the heat exchange box 41 through the first cooling pipe 21 and the air inlet pipe 42, and cools the flue gas together with the heat exchange medium. The water vapor can completely adhere to the side wall of the flue gas duct 11, maximizing heat exchange with the flue gas and improving the cooling effect. At the same time, after the water vapor is stopped from being supplied to the dust collector 1, the water vapor in the wet material belt transfer station 9 is used to cool the heat exchange box 41, ensuring the clarity inside the wet material belt transfer station 9 and improving the utilization rate of the water vapor.

[0083] In specific implementation, cooling water can be replaced by other fluid media with fast heat conduction, such as thermal oil. Oils have high boiling points and absorb heat quickly. As long as they can exchange heat with the flue gas in the flue gas duct 11, they will not be listed here one by one.

[0084] As an implementation method of heat exchange between cooling water and flue gas, the cooling water overflows the flue gas duct 11, and the cooling water fully contacts the flue gas duct 11, thereby improving the cooling effect on the flue gas. The cooling water generates high-temperature steam after the heat exchange is completed, and mixes with the water vapor collected by the wet material belt transfer station 9, which facilitates the subsequent recycling of water vapor and high-temperature steam and saves costs.

[0085] In some embodiments, see Figure 1 and Figure 5 The pelletizing kiln flue gas dust removal and cooling system also includes an ORC generator set 5. The air inlet end of the ORC generator set 5 is connected to a liquid inlet pipe 6, and the liquid outlet end of the ORC generator set 5 is connected to a liquid outlet pipe 7. The liquid inlet pipe 6 and the liquid outlet pipe 7 are connected through a heat exchange pipe 8 to form a closed loop with a heat exchange medium flowing therethrough. The heat exchange pipe 8 is spirally sleeved on the outer periphery of the outlet pipe 42. The generator set 5 provided in this embodiment realizes thermal energy power generation by exchanging heat with the high-temperature steam discharged from the heat exchange box 41, thereby improving the utilization rate of steam. The high-temperature steam after heat exchange can be liquefied and collected, or it can flow back to the heat exchange box 41 through the return liquid pipe 6 to participate in the heat exchange reaction again. The heat exchange pipe 8 is threaded, which not only strengthens the connection between the heat exchange pipe 42 and the outlet pipe 42, but also increases the contact area and improves the heat exchange effect.

[0086] It should be noted that generator set 5 includes an evaporator, an expander, a condenser, a working pump, and a generator. After heat exchange in heat exchange tubes 7, the heat exchange medium passes through the evaporator to generate steam at a certain pressure. The steam then enters the expander, performs work, and drives the generator to generate electricity. The steam then flows from the expander to the condenser, where it is cooled and condensed into a liquid medium. The working pump then pumps the liquid heat exchange medium back to the heat exchange tubes 7 through the liquid outlet pipe 8, completing a power cycle.

[0087] Optionally, the heat exchange medium is an organic medium with a low boiling point, such as isobutane or n-butane. The low boiling point of the organic medium allows it to absorb heat and turn into steam more quickly, thus meeting the requirements of a heat exchange medium. Of course, the heat exchange medium can also be other mediums with fast heat conduction, such as hot water, etc. As long as they can exchange heat with the high-temperature steam and enter the expander to perform work, they will not be listed here one by one.

[0088] In some embodiments, see Figure 2A motor 14 is installed within the exhaust duct 12, with fan blades 141 welded to it. The ORC generator set 5 is electrically connected to the motor 14. The motor 14 drives the fan blades 141 to rotate, thereby extracting the processed flue gas and residual water vapor from the dust collector 1. This keeps the dust collector 1 dry, prevents condensation caused by excessive humidity within the main body 1, and maintains the performance of the dust collector. The ORC generator set 5 supplies power to the motor 14, eliminating the need for additional power supply to the motor 14, improving resource utilization and saving costs.

[0089] During specific implementation, the generator 54 is also electrically connected to the exhaust fan 33. The electricity generated by the generator 54 can be used by the entire dust removal system, saving electricity costs and improving energy utilization.

[0090] In some embodiments, see Figure 4 The heat exchange box 41 also has a spray head 44 inside, and the spray direction of the spray head 44 is toward the flue gas duct 11; a water pump 45 is installed outside the heat exchange box 41, and the water pump 45 is connected to the heat exchange box 41 and the spray head 44 through pipelines. The water pump 45 is used to deliver cooling water to the spray head 44.

[0091] The spray head 44 and water pump 45 provided in this embodiment can change the heat exchange method between the heat exchange medium and the flue gas. The water pump 45 draws the heat exchange medium to the spray head 44 for spraying the flue gas duct 11. Compared with filling the heat exchange medium from the bottom up, this saves the amount of heat exchange medium used and saves costs. The heat exchange medium is divided into multiple water columns by the spray head 44 and sprayed into the flue gas duct 11, improving the heat exchange effect. The water columns evaporate more easily, allowing the water vapor to fill the entire heat exchange box 41. The water vapor and the flue gas duct 11 are in full contact. The water vapor and water columns jointly exchange heat with the flue gas, improving the heat exchange effect and heat exchange uniformity. The water pump 45 can continuously transport the heat exchange medium from the bottom of the heat exchange box 41 to the spray head 44, ensuring the continuous water spraying of the spray head 44.

[0092] Based on the above embodiments, see Figure 3 and Figure 4 The air inlet pipe 42 is tilted downward. The tilted air inlet pipe 42 can spray water vapor downward, spraying the water vapor into the heat exchange medium or the bottom of the heat exchange box 41. During the rising process, it contacts the flue gas duct 11 and exchanges heat, thereby improving the utilization rate of the water vapor.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pelletizing kiln flue gas dust removal and cooling system, characterized in that: include: The dust collector has a flue gas duct arranged at the bottom of the side, an exhaust duct arranged at the top, and filter bags arranged along the flow direction of the flue gas; Steam collection assembly for collecting water vapor at wet material belt transfer stations; A cooling pipe, with both ends connected to the dust collector and the steam collection assembly respectively, and an air outlet end of the cooling pipe is located below the filter bag; as well as A flue gas cooling component, used to cool the flue gas duct; The water vapor enters the dust collector through the cooling pipe and mixes with the flue gas to exchange heat, and the water vapor will not liquefy; The flue gas cooling components include: A heat exchange box, wherein the flue gas duct runs through the heat exchange box, cooling water is contained in the heat exchange box, and a water inlet that can be blocked is provided on the top of the heat exchange box; an air intake pipe, passing through the side wall of the heat exchange box, the air intake pipe being connected to the cooling pipe; and An air outlet pipe is provided at the top of the heat exchange box; The water vapor is also used to cool the interior of the heat exchange box.

2. The pelletizing kiln flue gas dust removal and cooling system according to claim 1, characterized in that: The cooling pipe includes a first cooling pipe, a flow regulating pipe and a second cooling pipe connected in sequence along the steam flow direction. The air inlet of the first cooling pipe is connected to the steam collecting assembly, and the air outlet of the second cooling pipe is connected to the dust collector.

3. The pelletizing kiln flue gas dust removal and cooling system according to claim 2, characterized in that: A coarse adjustment valve and a fine adjustment valve are sequentially provided on the flow regulating pipe along the steam flow direction.

4. The pelletizing kiln flue gas dust removal and cooling system according to claim 3, characterized in that: The dust collector is provided with a temperature display screen, and the coarse adjustment valve and the fine adjustment valve are respectively connected to the temperature display screen for communication.

5. The pelletizing kiln flue gas dust removal and cooling system according to claim 1, characterized in that: The steam collection assembly comprises: a collecting cabin, provided on the wet material belt transfer station and forming a collecting port, wherein the collecting port is communicated with the cooling pipe; and The exhaust fan is arranged in the collecting port.

6. The pelletizing kiln flue gas dust removal and cooling system according to claim 1, characterized in that: The pelletizing kiln flue gas dust removal and cooling system also includes an ORC generator set. The air inlet end of the ORC generator set is connected to a liquid inlet pipe, and the liquid outlet end of the ORC generator set is connected to a liquid outlet pipe. The liquid inlet pipe and the liquid outlet pipe are connected through a heat exchange pipe to form a closed loop with a heat exchange medium flowing therethrough. The heat exchange pipe is spirally sleeved on the outer circumference of the air outlet pipe.

7. The pelletizing kiln flue gas dust removal and cooling system according to claim 6, characterized in that: A motor is provided inside the air extraction pipe, an output end of the motor is connected to a fan blade, and the ORC generator set is electrically connected to the motor.

8. The pelletizing kiln flue gas dust removal and cooling system according to claim 1, characterized in that: The heat exchange box is further provided with a spray head, the spray direction of the spray head being toward the flue gas duct; A water pump is installed outside the heat exchange box. The water pump is connected to the heat exchange box and the spray head through pipelines. The water pump is used to deliver the cooling water to the spray head.

9. The pelletizing kiln flue gas dust removal and cooling system according to claim 1, characterized in that: The air intake pipe is arranged to be inclined downward.

Images