A device for recovering and utilizing the residual heat of sodium dichromate production roasting

Abstract

The application discloses a sodium dichromate production roasting waste heat recycling device and relates to the technical field of boiler equipment. The device comprises a mounting frame, a rotary kiln, a driving unit, a detection scraping unit, a waste heat recycling unit and a fixed feeding unit. The mounting frame is used for mounting and fixing the rotary kiln and the driving unit. The rotary kiln is used for sodium dichromate production roasting. The driving unit is used for power output. The detection scraping unit is used for nodular detection and scraping of the rotary kiln inner wall. The waste heat recycling unit is used for raw material temperature detection. The fixed feeding unit is used for feeding the preheated raw material into the rotary kiln. When the sodium dichromate is produced and roasted in the rotary kiln, the detection scraping unit is driven by the driving unit to detect and scrape the nodules in the rotary kiln at any time, so that uneven roasting is avoided. The raw material is preheated to a preset temperature by the waste heat recycling unit, and the raw material is fed by the fixed feeding unit, so that waste heat recycling is realized.

Description

Technical Field

[0001] The invention relates to the technical field of boiler equipment, in particular to a device for recovering and utilizing waste heat from roasting in the production of sodium dichromate. Background Art

[0002] Calcination is a key step in the production of sodium dichromate. The cleanliness of the rotary kiln, the primary equipment used for calcination, and the efficiency of waste heat recovery are crucial to production stability and energy efficiency. However, current sodium dichromate production technology faces numerous challenges in cleaning the rotary kiln's interior and recovering waste heat.

[0003] Currently, manual cleaning is often used to remove nodules from rotary kilns. This is labor-intensive and poses significant safety risks, such as burns from high temperatures and dust pollution. Furthermore, manual cleaning is slow, making it difficult to quickly remove large areas of nodules. This results in long production downtimes and severely impacts production efficiency. While more advanced cleaning technologies, such as chemical cleaning, can remove nodules to a certain extent, the chemicals used are often corrosive, damaging the kiln's lining and shortening its service life. Furthermore, extensive cleaning and treatment are required after chemical cleaning to remove residual chemicals, increasing production costs and environmental pressures. Furthermore, chemical cleaning methods struggle to achieve the desired cleaning results for some stubborn nodules, requiring the kiln to be shut down for cleaning, impacting production efficiency.

[0004] During the roasting process of sodium dichromate, a large amount of high-temperature flue gas is generated, which contains rich waste heat resources. Most of the flue gas is directly discharged to the outside after purification and dust removal, resulting in energy waste and unable to achieve preheating and recycling. Summary of the Invention

[0005] The object of the present invention is to provide a device for recovering and utilizing waste heat from roasting in the production of sodium dichromate, so as to solve the problems raised in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The device for recovering and utilizing waste heat from roasting in the production of sodium dichromate comprises a mounting frame, a rotary kiln, a drive unit, a detection and scraping unit, a waste heat recovery unit and a fixed-dosing unit. The mounting frame is placed on a horizontal foundation, the rotary kiln is fixedly connected to the drive unit, the drive unit is fixedly connected to the mounting frame, the detection and scraping unit is rotatably installed inside the rotary kiln, the detection and scraping unit is fixedly connected to the mounting frame, the waste heat recovery unit is fixedly connected to the mounting frame, the fixed-dosing unit is slidably connected to the detection and scraping unit, the detection and scraping unit has the function of cleaning nodules on the inner wall of the rotary kiln, the fixed-dosing unit is fixedly connected to the detection and scraping unit, and the fixed-dosing unit has the function of quantitatively dosing preheated raw materials.

[0008] The mounting frame is used to install and fix the rotary kiln and the drive unit. The rotary kiln is used for the production and roasting of sodium dichromate. The drive unit is used for power output. The detection and scraping unit is used for detecting and scraping nodules on the inner wall of the rotary kiln. The waste heat recovery unit is used to detect the temperature of the raw materials. The fixed-feed unit is used to feed the preheated raw materials into the rotary kiln. When sodium dichromate is produced and roasted in the rotary kiln, the detection and scraping unit is driven by the drive unit to detect and scrape nodules inside the rotary kiln at all times to avoid uneven roasting. The raw materials are preheated to a preset temperature by the waste heat recovery unit and fed through the fixed-feed unit to realize the recovery and utilization of waste heat.

[0009] Furthermore, a feed box is fixedly installed on one side of the mounting frame, and a discharge box is fixedly installed on the other side of the mounting frame. A burner is provided on the inner wall of the discharge box. One end of the rotary kiln is rotatably connected to the feed box, and the other end is rotatably connected to the discharge box. The mounting frame is provided with a supporting roller, and the feed box is fixedly connected to the detection and scraping unit.

[0010] The staff put the raw materials into the feed box and preheat them in preparation for roasting. The preheated raw materials enter the rotary kiln. At this time, the controller controls the burner to roast the raw materials. The roasted raw materials are transported to the discharge box for the next process.

[0011] Furthermore, the driving unit includes a driving motor, a transmission gear, a large ring gear and a support ring. The fixed end of the driving motor is fixedly mounted on the end of the mounting frame away from the horizontal base. The output end of the driving motor is fixedly connected to the transmission gear, and the transmission gear is meshed with the large ring gear. The large ring gear is fixedly mounted on the outer surface of the rotary kiln. The support ring is fixedly mounted on the outer surface of the rotary kiln, and the support ring abuts against the support roller of the mounting frame.

[0012] The controller controls the driving motor to rotate, thereby driving the transmission gear to rotate, and the rotary kiln is driven by the large gear ring to rotate, so that the rotary kiln drives the support ring to rotate on the mounting frame in preparation for roasting.

[0013] Furthermore, the detection and scraping unit includes an output motor, a rotating rod, a half gear, a half gear ring, a connecting rod, a rotating ring, an electric telescopic rod, a smoothing plate and a turntable. The fixed end of the output motor is fixedly installed on the outer surface of the feed box, the output end of the output motor extends into the interior of the rotary kiln and is fixedly connected to the rotating rod, the half gear is fixedly installed on the end of the rotating rod away from the output motor, the half gear is meshed with the half gear ring, one end of the connecting rod is fixedly connected to the half gear ring, and the other end is fixedly connected to the rotating ring, the rotating ring is rotatably installed in the interior of the rotary kiln, the fixed end of the electric telescopic rod is fixedly installed on the outer surface of the half gear ring, the output end of the electric telescopic rod is fixedly connected to one end of the smoothing plate through one end of the straight rod, the other end of the smoothing plate is rotatably installed on the outer surface of the rotating rod through the turntable, and the rotating rod is slidably connected to the fixed feeding unit.

[0014] Furthermore, the detection and scraping unit also includes a bent rod, a detection bent plate spring telescopic rod, a first electrode plate, a second electrode plate, an electric push rod, a scraper and a half cylinder, the bent rod is fixedly connected to the rotating rod, the fixed end of the spring telescopic rod is fixedly installed on the bent rod, the telescopic end of the spring telescopic rod is fixedly connected to the detection bent plate, the first electrode plate is fixedly installed on the end of the detection bent plate close to the horizontal base, the second electrode plate is fixedly installed on the end of the half cylinder away from the horizontal base, the second electrode plate is electrically connected to the electric push rod, the fixed end of the electric push rod is fixedly installed on the outer surface of the detection bent plate, the telescopic end of the electric push rod is fixedly connected to the scraper, the scraper is rotatably connected to the second electrode plate, and the half cylinder is fixedly connected to the bent rod.

[0015] When the preheated raw materials are put into the rotary kiln, the controller controls the output motor to rotate and drive the rotating rod to rotate, thereby driving the half gear and the half gear ring to engage and rotate. When the half gear and the half gear ring are engaged, the half gear ring swings and drives the rotating ring to rotate inside the rotary kiln under the transmission action of the connecting rod. On the other hand, the rotation of the half gear ring drives the smoothing plate to swing in the opposite direction under the transmission action of the electric telescopic rod, smoothing the raw materials accumulated in the rotary kiln and pushing the excess raw materials at the protrusions to the depressions, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln, avoiding uneven burning resulting in large temperature differences, and generating nodules inside the rotary kiln, which affects the quality of the raw materials. It affects the production quality. During the rotation of the rotating rod, the half-cylinder and the detection bent plate are driven to rotate synchronously under the transmission action of the bent rod. The detection bent plate contacts the inner wall of the rotary kiln during the rotation. When a nodule is encountered on the inner wall of the rotary kiln, the nodule bulges and squeezes the detection bent plate to move downward to compress the spring telescopic rod, thereby driving the first electrode plate to contact the second electrode plate. At this time, the current of the controller is transmitted to the electric push rod through the first electrode plate and the second electrode plate, thereby pushing the scraper to rotate around the half-cylinder and turn outward to remove the nodule on the inner wall of the rotary kiln. The contact between the raw material and the nodule causes the temperature transfer effect of the rotary kiln to deteriorate, resulting in uneven heating of the raw material and a decrease in the production and roasting quality of sodium dichromate.

[0016] Furthermore, the waste heat recovery unit includes a smoke exhaust pipe, a condenser and a heat conduction pipe. One end of the smoke exhaust pipe is conductively connected to the discharge box, and the other end is conductively connected to the condenser. One end of the heat conduction pipe is conductively connected to the condenser, and the other end goes deep into the feed box to contact the raw materials.

[0017] During the roasting process of sodium dichromate production, the flue gas containing heat is discharged from the exhaust pipe and initially cooled down by the condenser. After reaching the preset temperature, the heat in the flue gas is transported back to the feed box through the heat conduction pipe to preheat the raw materials, thereby realizing the recovery and utilization of the heat in the flue gas.

[0018] Furthermore, the fixed feeding unit includes a push plate, a telescopic spring, a memory metal plate, a curved rod, a baffle, a ring plate and a straight plate. The push plate is slidably mounted on the rotating rod. One end of the telescopic spring is fixedly connected to the inner wall of the feed box, and the other end is fixedly connected to the push plate. One end of the memory metal plate is fixedly connected to the ring plate, and the other end abuts against the push plate. One end of the curved rod is fixedly connected to the inner side of the memory metal plate, and the other end is fixedly connected to the baffle. The baffle is connected to the ring plate through a torsion spring, the ring plate is fixedly connected to the rotating rod through the straight plate, and the ring plate is fixedly connected to the push plate through a round rod.

[0019] As the rotating rod rotates, the straight plate drives the ring plate to rotate, which in turn drives the memory metal plate, stirring the raw materials inside the feed box. When the memory metal plate contacts raw materials that have reached the preset temperature range, it deforms and bends inward, pushing the baffle open under the transmission action of the arc rod. Furthermore, the inward bending of the memory metal plate releases the compression of the telescopic spring. Under the action of the telescopic spring's own restoring force, the push plate moves leftward, pushing the preheated raw materials into the rotary kiln for a quantitative feeding, thereby accelerating the production process of sodium dichromate and improving its production efficiency. It also avoids the problem of raw material nodules caused by large temperature differences.

[0020] Furthermore, a material blocking plate is provided on the smoothing plate.

[0021] During the operation of the rotary kiln, raw materials inside will accumulate and form bulges. The existence of the baffle plate can directly block the further movement of the bulged raw materials. During the rotation of the smoothing plate, the baffle plate can be used to block the bulged raw materials and push them to the surroundings or low-lying areas, making the distribution of raw materials in the rotary kiln more flat. The thickness of the raw materials can be effectively controlled in a relatively uniform state, avoiding local raw materials from being too thick or too thin, ensuring the uniform distribution of raw materials in the entire rotary kiln, and providing stable conditions for subsequent roasting reactions.

[0022] Furthermore, the driving motor and the output motor rotate in opposite directions.

[0023] In order to make the smoothing plate and the rotary kiln rotate in the same direction, when the smoothing plate and the rotary kiln rotate in the same direction, the smoothing plate can more effectively comb and flatten the raw materials. Under the action of relative motion, the smoothing plate can flatten the protruding areas of the raw materials and fill the concave areas, so that the raw materials can be spread more evenly on the cross section of the rotary kiln, ensuring the consistency of the raw material distribution in the entire kiln, helping to improve the uniformity of heat transfer during the roasting process, and thus improving the production quality and efficiency of sodium dichromate.

[0024] Furthermore, the memory metal plate is composed of an outer memory metal sheet and an inner memory metal sheet, and the expansion coefficient of the outer memory metal sheet is greater than that of the inner memory metal sheet.

[0025] In order to enable the outer memory metal sheet and the inner memory metal sheet to detect the raw materials preheated to the specified temperature and push the baffle to open by contracting and moving toward the inner memory metal sheet, the preheated raw materials are quantitatively fed into the rotary kiln for roasting, so as to reach the required reaction temperature more quickly, thereby accelerating the production process of sodium dichromate and further improving the production efficiency of sodium dichromate. At the same time, it reduces the inconsistent material reactions caused by temperature differences, avoids problems such as material accumulation or nodules caused by too low raw material temperature, and further ensures the uniformity of product quality.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention drives the half gear and the half gear ring to mesh and rotate by rotating the rotating rod. When the half gear and the half gear ring are meshed, the half gear ring swings, and at the same time, drives the smoothing plate to swing in the opposite direction, smoothing the raw materials accumulated and protruding inside the rotary kiln, and pushing the excess raw materials at the protruding parts to the concave parts, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln, avoiding uneven burning and causing large temperature differences, generating nodules inside the rotary kiln, and affecting the production quality. On the other hand, during the rotation of the rotating rod, Under the transmission action of the bending rod, the detection bent plate is driven to contact the inner wall of the rotary kiln during the rotation process. When encountering a nodule on the inner wall of the rotary kiln, the nodule bulges and squeezes the detection bent plate to move downward to compress the spring telescopic rod, thereby driving the first electrode plate to contact the second electrode plate, so that the electric push rod is energized and started, thereby pushing the scraper to rotate around the half cylinder and turn outward to remove the nodule on the inner wall of the rotary kiln. The contact between the raw material and the nodule causes the temperature transfer effect of the rotary kiln to deteriorate, resulting in uneven heating of the raw material and a decrease in the production and roasting quality of sodium dichromate.

[0028] 2. The present invention stirs the raw materials inside the feed box by rotating the rotating rod, which drives the memory metal plate to rotate. When the memory metal plate contacts the raw materials at a preset temperature range, it deforms and bends inward, pushing the baffle open and releasing the compression on the telescopic spring. Under the action of the telescopic spring's own restoring force, the push plate moves leftward, pushing the preheated raw materials into the rotary kiln for a single quantitative feeding, thereby accelerating the production process of sodium dichromate and improving its production efficiency. It also avoids the problem of raw material nodules caused by large temperature differences.

[0029] 3. The present invention enables the smoothing plate to rotate in the same direction as the rotary kiln. When the smoothing plate and the rotary kiln rotate in the same direction, the smoothing plate can more effectively comb and flatten the raw materials. Under the action of relative motion, the smoothing plate can flatten the protruding areas of the raw materials and fill the concave areas, so that the raw materials can be spread more evenly on the cross section of the rotary kiln, ensuring the consistency of the raw material distribution in the entire kiln, helping to improve the uniformity of heat transfer during the roasting process, and thus improving the production quality and efficiency of sodium dichromate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the overall appearance and structure of a sodium dichromate production and roasting waste heat recovery device of the present invention;

[0031] Figure 2 The invention relates to a sodium dichromate production roasting waste heat recovery and utilization device Figure 1 Another perspective structural diagram;

[0032] Figure 3 This is a schematic diagram of the internal structure of a rotary kiln in a sodium dichromate production roasting waste heat recovery device of the present invention;

[0033] Figure 4 The invention relates to a sodium dichromate production roasting waste heat recovery and utilization device Figure 3 Another perspective structural diagram;

[0034] Figure 5 This is a schematic structural diagram of the installation positions of the detection and scraping unit and the fixed-feeding unit of a sodium dichromate production roasting waste heat recovery and utilization device of the present invention;

[0035] Figure 6 This is a schematic diagram of the overall appearance and structure of a fixed-feed unit of a sodium dichromate production and roasting waste heat recovery and utilization device of the present invention;

[0036] Figure 7 This is a schematic diagram of the appearance and structure of a partial detection and scraping unit of a sodium dichromate production and roasting waste heat recovery device of the present invention;

[0037] Figure 8 This is a schematic diagram of the internal structure of a half-cylinder of a sodium dichromate production and roasting waste heat recovery device of the present invention;

[0038] Figure 9 The present invention is a schematic diagram of the installation position structure of the fixed injection unit of a sodium dichromate production roasting waste heat recovery device.

[0039] In the figure: 1. Mounting frame; 11. Feed box; 12. Discharge box; 13. Burner; 2. Rotary kiln; 3. Drive unit; 31. Drive motor; 32. Transmission gear; 33. Large ring gear; 34. Support ring; 4. Detection and scraping unit; 41. Output motor; 42. Rotating rod; 43. Half gear; 44. Half ring gear; 45. Connecting rod; 46. Rotating ring; 47. Electric telescopic rod; 48. Smoothing plate; 49. Turntable; 410. Bending Rod; 411, detection bend plate; 412, spring telescopic rod; 413, first electrode plate; 414, second electrode plate; 415, electric push rod; 416, scraper; 417, half cylinder; 5, waste heat recovery unit; 51, exhaust pipe; 52, condenser; 53, heat conduction pipe; 6, fixed injection unit; 61, push plate; 62, telescopic spring; 63, memory metal plate; 64, arc rod; 65, baffle; 66, ring plate; 67, straight plate. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] Example: Figures 1-9 As shown, the present invention provides a technical solution:

[0042] like Figure 1 、 5 As shown, a sodium dichromate production roasting waste heat recovery and utilization device includes a mounting frame 1, a rotary kiln 2, a drive unit 3, a detection and scraping unit 4, a waste heat recovery unit 5 and a fixed feeding unit 6. The mounting frame 1 is placed on a horizontal foundation, the rotary kiln 2 is fixedly connected to the drive unit 3, the drive unit 3 is fixedly connected to the mounting frame 1, the detection and scraping unit 4 is rotatably installed inside the rotary kiln 2, the detection and scraping unit 4 is fixedly connected to the mounting frame 1, the waste heat recovery unit 5 is fixedly connected to the mounting frame 1, the fixed feeding unit 6 is slidably connected to the detection and scraping unit 4, the detection and scraping unit 4 has the function of cleaning nodules on the inner wall of the rotary kiln 2, the fixed feeding unit 6 is fixedly connected to the detection and scraping unit 4, and the fixed feeding unit 6 has the function of quantitatively feeding preheated raw materials.

[0043] The mounting frame 1 is used to install and fix the rotary kiln 2 and the driving unit 3. The rotary kiln 2 is used for the production and roasting of sodium dichromate. The driving unit 3 is used for power output. The detection and scraping unit 4 is used for detecting and scraping nodules on the inner wall of the rotary kiln 2. The waste heat recovery unit 5 is used to detect the temperature of the raw materials. The fixed feeding unit 6 is used to feed the preheated raw materials into the rotary kiln 2. When sodium dichromate is produced and roasted in the rotary kiln 2, the detection and scraping unit 4 is driven by the driving unit 3 to constantly detect and scrape nodules inside the rotary kiln 2 to avoid uneven roasting. The raw materials are preheated to a preset temperature by the waste heat recovery unit 5 and fed through the fixed feeding unit 6 to realize the recovery and utilization of waste heat.

[0044] like Figure 1 、 2 As shown in Figure 3, a feed box 11 is fixedly installed on one side of the mounting frame 1, and a discharge box 12 is fixedly installed on the other side of the mounting frame 1. A burner 13 is provided on the inner wall of the discharge box 12. One end of the rotary kiln 2 is rotatably connected to the feed box 11, and the other end is rotatably connected to the discharge box 12. The mounting frame 1 is provided with a supporting roller, and the feed box 11 is fixedly connected to the detection scraping unit 4.

[0045] The staff puts the raw materials into the feed box 11 and preheats them to prepare for roasting. The preheated raw materials enter the rotary kiln 2. At this time, the controller controls the burner 13 to work and roast the raw materials. The roasted raw materials are transported to the discharge box 12 for the next process.

[0046] like Figure 2 As shown, the driving unit 3 includes a driving motor 31, a transmission gear 32, a large ring gear 33 and a support ring 34. The fixed end of the driving motor 31 is fixedly mounted on the end of the mounting frame 1 away from the horizontal foundation. The output end of the driving motor 31 is fixedly connected to the transmission gear 32. The transmission gear 32 is meshed with the large ring gear 33. The large ring gear 33 is fixedly mounted on the outer surface of the rotary kiln 2. The support ring 34 is fixedly mounted on the outer surface of the rotary kiln 2. The support ring 34 abuts against the support roller of the mounting frame 1.

[0047] The controller controls the driving motor 31 to rotate, thereby driving the transmission gear 32 to rotate, and the rotary kiln 2 is driven by the large ring gear 33 to rotate, so that the rotary kiln 2 drives the support ring 34 to rotate on the mounting frame 1 to prepare for roasting.

[0048] like Figure 6 、 7As shown, the detection and scraping unit 4 includes an output motor 41, a rotating rod 42, a half gear 43, a half gear ring 44, a connecting rod 45, a swivel 46, an electric telescopic rod 47, a smoothing plate 48 and a turntable 49. The fixed end of the output motor 41 is fixedly mounted on the outer surface of the feed box 11, the output end of the output motor 41 extends into the interior of the rotary kiln 2 and is fixedly connected to the rotating rod 42, the half gear 43 is fixedly mounted on the end of the rotating rod 42 away from the output motor 41, the half gear 43 is meshed with the half gear ring 44, one end of the connecting rod 45 is fixedly connected to the half gear ring 44, and the other end is fixedly connected to the swivel 46, the swivel 46 is rotatably mounted inside the rotary kiln 2, the fixed end of the electric telescopic rod 47 is fixedly mounted on the outer surface of the half gear ring 44, the output end of the electric telescopic rod 47 is fixedly connected to one end of the smoothing plate 48 through one end of the straight rod, the other end of the smoothing plate 48 is rotatably mounted on the outer surface of the rotating rod 42 through the turntable 49, and the rotating rod 42 is slidably connected to the fixed feeding unit 6.

[0049] like Figure 7 、 8 As shown, the detection and scraping unit 4 also includes a bending rod 410, a detection bent plate 411, a spring telescopic rod 412, a first electrode plate 413, a second electrode plate 414, an electric push rod 415, a scraper 416 and a half cylinder 417. The bending rod 410 is fixedly connected to the rotating rod 42, the fixed end of the spring telescopic rod 412 is fixedly installed on the bending rod 410, the telescopic end of the spring telescopic rod 412 is fixedly connected to the detection bent plate 411, the first electrode plate 413 is fixedly installed on the end of the detection bent plate 411 close to the horizontal base, the second electrode plate 414 is fixedly installed on the end of the half cylinder 417 away from the horizontal base, the second electrode plate 414 is electrically connected to the electric push rod 415, the fixed end of the electric push rod 415 is fixedly installed on the outer surface of the detection bent plate 411, the telescopic end of the electric push rod 415 is fixedly connected to the scraper 416, the scraper 416 is rotatably connected to the second electrode plate 414, and the half cylinder 417 is fixedly connected to the bending rod 410.

[0050] After the preheated raw materials are put into the rotary kiln 2, the controller controls the output motor 41 to rotate and drive the rotating rod 42 to rotate, thereby driving the half gear 43 and the half gear ring 44 to engage and rotate. When the half gear 43 is engaged with the half gear ring 44, the half gear ring 44 swings and drives the rotating ring 46 to rotate inside the rotary kiln 2 under the transmission action of the connecting rod 45. On the other hand, the rotation of the half gear ring 44 drives the smoothing plate 48 to swing in the opposite direction under the transmission action of the electric telescopic rod 47, so as to smooth out the raw materials accumulated and protruding inside the rotary kiln 2 and push the excess raw materials at the protrusions to the depressions, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln 2 and avoiding uneven burning resulting in large temperature differences, which will cause nodules inside the rotary kiln 2 and affect the production quality. During the rotation of the rod 42, under the transmission action of the bent rod 410, the half cylinder 417 and the detection bent plate 411 are driven to rotate synchronously. During the rotation of the detection bent plate 411, it contacts the inner wall of the rotary kiln 2. When encountering a nodule on the inner wall of the rotary kiln 2, the nodule bulges and squeezes the detection bent plate 411 to move downward, compressing the spring telescopic rod 412, thereby driving the first electrode plate 413 to contact the second electrode plate 414. At this time, the current of the controller is transmitted to the electric push rod 415 through the first electrode plate 413 and the second electrode plate 414, thereby pushing the scraper 416 to rotate around the half cylinder 417 and turn outward to remove the nodule on the inner wall of the rotary kiln 2. The contact between the raw material and the nodule causes the temperature transfer effect of the rotary kiln 2 to deteriorate, resulting in uneven heating of the raw material and a decrease in the production and roasting quality of sodium dichromate.

[0051] like Figure 3 、 4 As shown, the waste heat recovery unit 5 includes a smoke exhaust pipe 51, a condenser 52 and a heat pipe 53. One end of the smoke exhaust pipe 51 is conductively connected to the discharge box 12, and the other end is conductively connected to the condenser 52. One end of the heat pipe 53 is conductively connected to the condenser 52, and the other end goes deep into the feed box 11 to contact the raw materials.

[0052] During the roasting process of sodium dichromate production, the flue gas containing heat is discharged from the exhaust pipe 51 and then cooled down for the first time by the condenser 52. After reaching the preset temperature, the heat in the flue gas is transported back to the inside of the feed box 11 through the heat pipe 53 to preheat the raw materials, thereby realizing the recovery and utilization of the heat in the flue gas.

[0053] like Figure 6 、 9As shown, the fixed feeding unit 6 includes a push plate 61, a telescopic spring 62, a memory metal plate 63, a curved rod 64, a baffle 65, a ring plate 66 and a straight plate 67. The push plate 61 is slidably mounted on the rotating rod 42. One end of the telescopic spring 62 is fixedly connected to the inner wall of the feed box 11, and the other end is fixedly connected to the push plate 61. One end of the memory metal plate 63 is fixedly connected to the ring plate 66, and the other end abuts against the push plate 61. One end of the curved rod 64 is fixedly connected to the inner side of the memory metal plate 63, and the other end is fixedly connected to the baffle 65. The baffle 65 is connected to the ring plate 66 through a torsion spring. The ring plate 66 is fixedly connected to the rotating rod 42 through the straight plate 67. The ring plate 66 is fixedly connected to the push plate 61 through a round rod.

[0054] During the rotation of the rotating rod 42, the ring plate 66 is driven to rotate by the transmission action of the straight plate 67. During the rotation of the ring plate 66, the memory metal plate 63 is driven to rotate, stirring the raw materials inside the feed box 11. When the memory metal plate 63 contacts the raw materials that have reached the preset temperature range, the memory metal plate 63 deforms and bends inward, and the baffle 65 is pushed open by the transmission action of the arc rod 64. On the other hand, the inward bending of the memory metal plate 63 releases the compression of the telescopic spring 62. Under the action of the restoring force of the telescopic spring 62, the push plate 61 is pushed to the left to push the preheated raw materials into the rotary kiln 2 for a quantitative feeding, thereby accelerating the production process of sodium dichromate and improving the production efficiency of sodium dichromate. It also avoids the problem of raw material nodules caused by excessive temperature differences.

[0055] like Figure 6 、 9 As shown, a material blocking plate is provided on the smoothing plate 48 .

[0056] During the operation of the rotary kiln 2, raw materials inside will accumulate and form bulges. The existence of the material baffle can directly prevent the further movement of the bulged raw materials. During the rotation of the smoothing plate 48, the material baffle can be used to push the bulged raw materials to the surroundings or low-lying areas, so that the distribution of the raw materials in the rotary kiln 2 is smoother, and the thickness of the raw materials is effectively controlled to be relatively uniform, avoiding local raw materials from being too thick or too thin, ensuring the uniform distribution of raw materials in the entire rotary kiln 2, and providing stable conditions for the subsequent roasting reaction.

[0057] like Figure 2 、 6 As shown, the driving motor 31 and the output motor 41 rotate in opposite directions.

[0058] In order to make the smoothing plate 48 rotate in the same direction as the rotary kiln 2, when the smoothing plate 48 rotates in the same direction as the rotary kiln 2, the smoothing plate 48 can more effectively comb and flatten the raw materials. Under the action of relative movement, the smoothing plate 48 can flatten the protruding areas of the raw materials and fill the concave areas, so that the raw materials can be spread more evenly on the cross section of the rotary kiln 2, ensuring the consistency of the raw material distribution in the entire kiln, helping to improve the uniformity of heat transfer during the roasting process, and thus improving the production quality and efficiency of sodium dichromate.

[0059] like Figure 6 、 9 As shown, the memory metal plate 63 is composed of an outer memory metal sheet and an inner memory metal sheet. The expansion coefficient of the outer memory metal sheet is greater than that of the inner memory metal sheet.

[0060] In order to enable the outer memory metal sheet and the inner memory metal sheet to detect the raw materials preheated to the specified temperature and push the baffle 65 to open by contracting and moving toward the inner memory metal sheet, the preheated raw materials are quantitatively fed into the rotary kiln 2 for roasting, and the required temperature for the reaction is reached more quickly, thereby accelerating the production process of sodium dichromate and further improving the production efficiency of sodium dichromate. At the same time, it reduces the inconsistency of material reactions caused by temperature differences, avoids problems such as material accumulation or nodules caused by too low raw material temperature, and further ensures the uniformity of product quality.

[0061] Working principle of the present invention:

[0062] The staff puts the raw materials into the feed box 11 and preheats them to prepare for roasting. The preheated raw materials enter the rotary kiln 2. At this time, the controller controls the burner 13 to work and roast the raw materials. The roasted raw materials are transported to the discharge box 12 for the next process.

[0063] The controller controls the driving motor 31 to rotate, thereby driving the transmission gear 32 to rotate, and driving the rotary kiln 2 to rotate under the transmission action of the large ring gear 33, so that the rotary kiln 2 drives the support ring 34 to rotate on the mounting frame 1. When the preheated raw materials are put into the rotary kiln 2, the controller controls the output motor 41 to rotate and drive the rotating rod 42 to rotate, thereby driving the half gear 43 and the half ring gear 44 to engage and rotate. When the half gear 43 is engaged with the half ring gear 44, the half ring gear swings while driving the rotating ring 46 to rotate inside the rotary kiln 2 under the transmission action of the connecting rod 45. On the other hand, the rotation of the half ring gear 44 drives the smoothing plate 48 to swing in the opposite direction under the transmission action of the electric telescopic rod 47, so as to smooth out the raw materials accumulated inside the rotary kiln 2 and push the excess raw materials at the protrusions to the depressions, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln 2 and avoiding The uneven burning leads to a large temperature difference, which produces nodules inside the rotary kiln 2, affecting the production quality. During the rotation of the rotating rod 42, the half-cylinder 417 and the detection bent plate 411 are driven to rotate synchronously under the transmission action of the bent rod 410. The detection bent plate 411 contacts the inner wall of the rotary kiln 2 during the rotation. When encountering a nodule on the inner wall of the rotary kiln 2, the nodule bulges and squeezes the detection bent plate 411 to move downward, compressing the spring telescopic rod 412, thereby driving the first electrode plate 413 to contact the second electrode plate 414. At this time, the current of the controller is transmitted to the electric push rod 415 through the first electrode plate 413 and the second electrode plate 414, thereby pushing the scraper 416 to rotate around the half-cylinder 417 and turn outward to remove the nodules on the inner wall of the rotary kiln 2. The contact between the raw material and the nodule causes the temperature transfer effect of the rotary kiln 2 to deteriorate, resulting in uneven heating of the raw material and a decrease in the production roasting quality of sodium dichromate.

[0064] During the roasting process of sodium dichromate production, the flue gas containing heat is discharged from the exhaust pipe 51 and then cooled down for the first time by the condenser 52. After reaching the preset temperature, the heat in the flue gas is transported back to the inside of the feed box 11 through the heat pipe 53 to preheat the raw materials, thereby realizing the recovery and utilization of the heat in the flue gas.

[0065] During the rotation of the rotating rod 42, the ring plate 66 is driven to rotate by the transmission action of the straight plate 67. During the rotation of the ring plate 66, the memory metal plate 63 is driven to rotate, stirring the raw materials inside the feed box 11. When the memory metal plate 63 contacts the raw materials that have reached the preset temperature range, the memory metal plate 63 deforms and bends inward, and the baffle 65 is pushed open by the transmission action of the arc rod 64. On the other hand, the inward bending of the memory metal plate 63 releases the compression of the telescopic spring 62. Under the action of the restoring force of the telescopic spring 62, the push plate 61 is pushed to the left, pushing the preheated raw materials into the rotary kiln 2 for a quantitative feeding, thereby accelerating the production process of sodium dichromate, improving the production efficiency of sodium dichromate, and avoiding the problem of raw material nodules caused by excessive temperature differences.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A device for recovering and utilizing waste heat from roasting of sodium dichromate production, characterized by: A sodium dichromate production roasting waste heat recovery and utilization device comprises a mounting frame (1), a rotary kiln (2), a drive unit (3), a detection and scraping unit (4), a waste heat recovery unit (5) and a fixed feeding unit (6), wherein the mounting frame (1) is placed on a horizontal foundation, the rotary kiln (2) is fixedly connected to the drive unit (3), the drive unit (3) is fixedly connected to the mounting frame (1), the detection and scraping unit (4) is rotatably mounted inside the rotary kiln (2), the detection and scraping unit (4) is fixedly connected to the mounting frame (1), the waste heat recovery unit (5) is fixedly connected to the mounting frame (1), the fixed feeding unit (6) is slidably connected to the detection and scraping unit (4), the detection and scraping unit (4) has the function of cleaning nodules on the inner wall of the rotary kiln (2), and the fixed feeding unit (6) has the function of quantitatively feeding preheated raw materials; A feed box (11) is fixedly mounted on one side of the mounting frame (1), and a discharge box (12) is fixedly mounted on the other side of the mounting frame (1). A burner (13) is provided on the inner wall of the discharge box (12). One end of the rotary kiln (2) is rotatably connected to the feed box (11), and the other end is rotatably connected to the discharge box (12). The mounting frame (1) is provided with a supporting roller. The feed box (11) is fixedly connected to the detection and scraping unit (4). The detection and scraping unit (4) includes an output motor (41), a rotating rod (42), a half gear (43), a half gear ring (44), a connecting rod (45), a rotating ring (46), an electric telescopic rod (47), a smoothing plate (48) and a rotating disk (49), wherein the fixed end of the output motor (41) is fixedly mounted on the outer surface of the feed box (11), the output end of the output motor (41) extends into the interior of the rotary kiln (2) and is fixedly connected to the rotating rod (42), the half gear (43) is fixedly mounted on the end of the rotating rod (42) away from the output motor (41), the half gear (43) is meshed with the half gear ring (44), one end of the connecting rod (45) is fixedly connected to the half gear ring (44), and the other end is fixedly connected to the rotating rod (45). The ring (46) is fixedly connected, and the rotating ring (46) is rotatably mounted inside the rotary kiln (2). There are two electric telescopic rods (47) on the left and right sides. The fixed end of the electric telescopic rod (47) on the left is fixedly mounted on the outer surface of the half gear ring (44). The output end of the electric telescopic rod (47) on the left is fixedly connected to one end of the smoothing plate (48) through one end of the straight rod. The fixed end of the electric telescopic rod (47) on the right is fixedly mounted on the turntable (49). The output end of the electric telescopic rod (47) on the right is fixedly connected to one end of the smoothing plate (48) through one end of the straight rod. The turntable (49) is rotatably mounted on the rotating rod (42), and the rotating rod (42) is slidably connected to the fixed injection unit (6).

2. The sodium dichromate production roasting waste heat recovery and utilization device according to claim 1, characterized in that: The driving unit (3) comprises a driving motor (31), a transmission gear (32), a large gear ring (33) and a support ring (34); the fixed end of the driving motor (31) is fixedly mounted on an end of the mounting frame (1) away from the horizontal base; the output end of the driving motor (31) is fixedly connected to the transmission gear (32); the transmission gear (32) is meshedly connected to the large gear ring (33); the large gear ring (33) is fixedly mounted on the outer surface of the rotary kiln (2); the support ring (34) is fixedly mounted on the outer surface of the rotary kiln (2); and the support ring (34) abuts against the support roller of the mounting frame (1).

3. The sodium dichromate production roasting waste heat recovery and utilization device according to claim 1, characterized in that: The detection scraping unit (4) further comprises a bending rod (410), a detection bending plate (411), a spring telescopic rod (412), a first electrode plate (413), a second electrode plate (414), an electric push rod (415), a scraper (416) and a half cylinder (417), wherein the bending rod (410) is fixedly connected to the rotating rod (42), the fixed end of the spring telescopic rod (412) is fixedly mounted on the bending rod (410), the telescopic end of the spring telescopic rod (412) is fixedly connected to the detection bending plate (411), and the first electrode plate (413) is fixedly mounted. The second electrode plate (414) is fixedly mounted on one end of the detection bend plate (411) close to the horizontal foundation, and the second electrode plate (414) is fixedly mounted on one end of the semi-cylinder (417) away from the horizontal foundation. The second electrode plate (414) is electrically connected to the electric push rod (415). The fixed end of the electric push rod (415) is fixedly mounted on the outer surface of the detection bend plate (411). The telescopic end of the electric push rod (415) is fixedly connected to the scraper (416). The scraper (416) is rotatably connected to the second electrode plate (414). The semi-cylinder (417) is fixedly connected to the bending rod (410).

4. The device for recovering and utilizing waste heat from roasting of sodium dichromate production according to claim 1, wherein: The waste heat recovery unit (5) comprises a smoke exhaust pipe (51), a condenser (52) and a heat conduction pipe (53); one end of the smoke exhaust pipe (51) is conductively connected to the discharge box (12), and the other end is conductively connected to the condenser (52); one end of the heat conduction pipe (53) is conductively connected to the condenser (52), and the other end is deeply inserted into the feed box (11) to contact the raw materials.

5. The device for recovering and utilizing waste heat from roasting of sodium dichromate production according to claim 1, characterized in that: The fixed feeding unit (6) includes a push plate (61), a telescopic spring (62), a memory metal plate (63), an arc rod (64), a baffle (65), a ring plate (66) and a straight plate (67). The push plate (61) is slidably mounted on the rotating rod (42). One end of the telescopic spring (62) is fixedly connected to the inner wall of the feed box (11), and the other end is fixedly connected to the push plate (61). One end of the memory metal plate (63) is fixedly connected to the ring plate (66), and the other end abuts against the push plate (61). One end of the arc rod (64) is fixedly connected to the inner side of the memory metal plate (63), and the other end is fixedly connected to the baffle (65). The baffle (65) is connected to the ring plate (66) through a torsion spring. The ring plate (66) is fixedly connected to the rotating rod (42) through the straight plate (67). The ring plate (66) is fixedly connected to the push plate (61) through a round rod.

6. The device for recovering and utilizing waste heat from roasting of sodium dichromate production according to claim 1, characterized in that: A material blocking plate is provided on the smoothing plate (48).

7. The device for recovering and utilizing waste heat from roasting of sodium dichromate production according to claim 2, characterized in that: The driving motor (31) and the output motor (41) rotate in opposite directions.

8. The device for recovering and utilizing waste heat from roasting of sodium dichromate production according to claim 5, characterized in that: The memory metal plate (63) consists of an outer memory metal sheet and an inner memory metal sheet, and the expansion coefficient of the outer memory metal sheet is greater than that of the inner memory metal sheet.

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