Roasting waste heat recycling device for sodium dichromate production

Abstract

The invention discloses a sodium dichromate production roasting waste heat recycling device, and relates to the technical field of boiler equipment.The sodium dichromate production roasting waste heat recycling device comprises a mounting frame, a rotary kiln, a driving unit, a detecting and scraping unit, a waste heat recycling unit and a fixed investment unit, the mounting frame is used for mounting and fixing the rotary kiln and the driving unit, and the rotary kiln is used for sodium dichromate production roasting; the driving unit is used for outputting power, the detecting and scraping unit is used for detecting and scraping nodules on the inner wall of the rotary kiln, the waste heat recycling unit is used for detecting the temperature of raw materials, and the fixed feeding unit is used for feeding the preheated raw materials into the rotary kiln. The driving unit drives the detecting and scraping unit to detect and scrape nodules in the rotary kiln all the time, uneven roasting is avoided, raw materials are preheated to the preset temperature through the waste heat recycling unit, the raw materials are fed through the fixed feeding unit, and recycling of waste heat is achieved.

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] In the production process of sodium dichromate, roasting is one of the key steps. As the main equipment for roasting, the cleanliness of the inside of the rotary kiln and the efficiency of waste heat recovery have a vital impact on the stability of production and energy utilization. However, the current sodium dichromate production technology has many problems that need to be solved in terms of nodule cleaning and waste heat recovery in the rotary kiln.

[0003] At present, manual cleaning is mostly used to clean the nodules inside the rotary kiln. Manual cleaning is not only labor-intensive, but also has great safety hazards, such as high temperature burns, dust pollution, etc. At the same time, manual cleaning is slow, and it is difficult to complete the cleaning of large-scale nodules in a short time, resulting in long production downtime, which seriously affects production efficiency. Some more advanced cleaning technologies, such as chemical cleaning, can remove nodules to a certain extent, but the chemicals used are often corrosive, which will damage the lining materials of the rotary kiln and shorten the service life of the equipment. In addition, a lot of cleaning and processing work is required after chemical cleaning to remove residual chemicals, which increases production costs and environmental pressures. Moreover, for some stubborn nodules, chemical cleaning methods are also difficult to achieve ideal cleaning effects, and they also need to be shut down for cleaning, affecting 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 the 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: The device for recovering and utilizing waste heat from roasting in the production of sodium dichromate comprises a mounting frame, a rotary kiln, a driving unit, a detection and scraping unit, a waste heat recovery unit and a fixed dosage unit. The mounting frame is placed on a horizontal basis, the rotary kiln is fixedly connected to the driving unit, the driving 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 dosage 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 dosage unit is fixedly connected to the detection and scraping unit, and the fixed dosage unit has the function of quantitatively dispensing preheated raw materials.

[0007] The mounting frame is used to install and fix the rotary kiln and the driving unit. The rotary kiln is used for the production and roasting of sodium dichromate. The driving 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 driving 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.

[0008] 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 supporting rollers, and the feed box is fixedly connected to the detection and scraping unit.

[0009] The staff puts the raw materials into the feed box for preheating 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.

[0010] Furthermore, the driving unit includes a driving motor, a transmission gear, a large gear ring and a support ring. The fixed end of the driving motor is fixedly installed on the end of the mounting frame away from the horizontal foundation. The output end of the driving motor is fixedly connected to the transmission gear, and the transmission gear is meshingly connected to the large gear ring. The large gear ring is fixedly installed on the outer surface of the rotary kiln. The support ring is fixedly installed on the outer surface of the rotary kiln, and the support ring abuts against the support roller of the mounting frame.

[0011] The controller controls the driving motor to rotate, thereby driving the transmission gear to rotate, and the rotary kiln is driven to rotate under the transmission action of the large gear ring, so that the rotary kiln drives the support ring to rotate on the mounting frame to prepare for roasting.

[0012] 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 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 feed unit.

[0013] Furthermore, the detection and scraping unit also includes a bending rod, a detection bending plate spring telescopic rod, a first electrode plate, a second electrode plate, an electric push rod, a scraper and a half cylinder, the bending rod is fixedly connected to the rotating rod, the fixed end of the spring telescopic rod is fixedly installed on the bending rod, the telescopic end of the spring telescopic rod is fixedly connected to the detection bending plate, the first electrode plate is fixedly installed on the end of the detection bending plate close to the horizontal foundation, the second electrode plate is fixedly installed on the end of the half cylinder away from the horizontal foundation, 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 bending 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 bending rod.

[0014] 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 mesh and rotate. When the half gear and the half gear ring are meshed, 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, so as to smooth the protruding raw materials accumulated inside the rotary kiln 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, avoiding uneven burning resulting in large temperature differences, and generating nodules inside the rotary kiln, which affects 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 rotation. When there is a nodule on the inner wall of the rotary kiln, the bulge at the nodule 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.

[0015] 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 material.

[0016] During the production and roasting process of sodium dichromate, the flue gas containing heat is discharged from the exhaust pipe and cooled down for the first time through 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.

[0017] Furthermore, the fixed feeding unit includes a push plate, a telescopic spring, a memory metal plate, an arc 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 the push plate. One end of the arc 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.

[0018] During the rotation of the rotating rod, the ring plate is driven to rotate under the transmission of the straight plate, and the memory metal plate is driven to rotate during the rotation of the ring plate to stir the raw materials inside the feed box. When the memory metal plate contacts the raw materials that have reached the preset temperature range, the memory metal plate deforms and bends inward, and the baffle is pushed open under the transmission of the arc rod. On the other hand, the compression of the telescopic spring is released during the inward bending of the memory metal plate. Under the action of the restoring force of the telescopic spring itself, the push plate is pushed to move to the left to push the preheated raw materials into the rotary kiln for a quantitative feeding, thereby speeding up 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.

[0019] Furthermore, a material blocking plate is arranged on the smoothing plate.

[0020] During the operation of the rotary kiln, the raw materials inside will accumulate and form bulges. 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 the raw materials in the rotary kiln smoother. The thickness of the raw materials can be effectively controlled in a relatively uniform state to avoid local raw materials 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.

[0021] Furthermore, the driving motor and the output motor rotate in opposite directions.

[0022] 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 comb and flatten the raw materials more effectively. Under the action of relative movement, the smoothing plate can flatten the protruding areas of the raw materials and fill the sunken 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, thereby improving the production quality and efficiency of sodium dichromate.

[0023] Furthermore, the memory metal plate 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.

[0024] 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 temperature for the reaction more quickly, thereby speeding up the production process of sodium dichromate, and then improving the production efficiency of sodium dichromate, while reducing the inconsistent material reaction caused by temperature difference, avoiding the problems of material accumulation or nodule caused by too low raw material temperature, and further ensuring the uniformity of product quality.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 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, so as to smooth the protruding raw materials accumulated inside the rotary kiln, and push 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 resulting in 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 bulge of the nodule 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 powered on 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.

[0026] 2. The present invention drives the memory metal plate to rotate during the rotation of the rotating rod, and stirs the raw materials in the feed box. When the memory metal plate contacts the raw materials that have reached the preset temperature range, the memory metal plate deforms and bends inward, pushing the baffle to open and releasing the compression of the telescopic spring. Under the action of the restoring force of the telescopic spring, the push plate is pushed to move to the left to push the preheated raw materials into the rotary kiln for quantitative feeding, thereby speeding up 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.

[0027] 3. The present invention makes the smoothing plate rotate in the same direction as the rotary kiln. When the smoothing plate rotates in the same direction as the rotary kiln, the smoothing plate can comb and flatten the raw materials more effectively. Under the action of relative motion, the smoothing plate can flatten the protruding raw material areas and fill the sunken areas, so that the raw materials can be spread more evenly on the cross section of the rotary kiln, ensuring the consistency of raw material distribution in the entire kiln, helping to improve the uniformity of heat transfer during the roasting process, thereby improving the production quality and efficiency of sodium dichromate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall appearance structure of a sodium dichromate production roasting waste heat recovery device of the present invention; Figure 2 The invention relates to a sodium dichromate production roasting waste heat recovery and utilization device Figure 1 Another perspective structural diagram of; Figure 3 This is a schematic diagram of the internal structure of a rotary kiln of a sodium dichromate production roasting waste heat recovery device of the present invention; Figure 4 The invention relates to a sodium dichromate production roasting waste heat recovery and utilization device Figure 3 Another perspective structural diagram; Figure 5 This is a schematic diagram of the installation position of the detection and scraping unit and the fixed injection unit of a sodium dichromate production roasting waste heat recovery and utilization device of the present invention; Figure 6 This is a schematic diagram of the overall appearance structure of a fixed-feed unit of a sodium dichromate production roasting waste heat recovery and utilization device of the present invention; Figure 7 This is a schematic diagram of the appearance structure of a partial detection and scraping unit of a sodium dichromate production roasting waste heat recovery and utilization device of the present invention; Figure 8 This is a schematic diagram of the internal structure of a half-cylinder of a sodium dichromate production roasting waste heat recovery and utilization device of the present invention; Fig. 9The present invention is a schematic diagram of the installation position structure of a fixed-feed unit of a sodium dichromate production roasting waste heat recovery and utilization device.

[0029] In the figure: 1, mounting frame; 11, feeding box; 12, discharging box; 13, burner; 2, rotary kiln; 3, driving unit; 31, driving motor; 32, transmission gear; 33, large gear ring; 34, supporting ring; 4, detection and scraping unit; 41, output motor; 42, rotating rod; 43, half gear; 44, half gear ring; 45, connecting rod; 46, rotating ring; 47, electric telescopic rod; 48, smoothing plate; 49, turntable; 410, bending Rod; 411, detection bent 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, smoke 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

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] Example: Figure 1-Figure 9 As shown, the present invention provides a technical solution: 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 driving unit 3, a detection and scraping unit 4, a waste heat recovery unit 5 and a fixed dosage unit 6. The mounting frame 1 is placed on a horizontal basis, the rotary kiln 2 is fixedly connected to the driving unit 3, the driving 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 dosage unit 6 is slidably connected to the detection and scraping unit 4, the detection and scraping unit 4 has the function of cleaning the nodules on the inner wall of the rotary kiln 2, the fixed dosage unit 6 is fixedly connected to the detection and scraping unit 4, and the fixed dosage unit 6 has the function of quantitatively dispensing preheated raw materials.

[0032] 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 the output of power. 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-feed unit 6 is used to feed the preheated raw materials into the rotary kiln 2. When the 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 detect and scrape nodules inside the rotary kiln 2 at all times to avoid uneven roasting. The raw materials are preheated to a preset temperature by the waste heat recovery unit 5 and fed by the fixed-feed unit 6 to realize the recovery and utilization of waste heat.

[0033] like Figure 1 , 2 As shown in , 3, a feed box 11 is fixedly mounted on one side of the mounting frame 1, a discharge box 12 is fixedly mounted on the other side of the mounting frame 1, a burner 13 is arranged 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 supporting rollers, and the feed box 11 is fixedly connected to the detection and scraping unit 4.

[0034] The staff passes the raw materials into the feed box 11 for preheating in preparation 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.

[0035] like Figure 2 As shown, the driving unit 3 includes 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 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 meshedly connected with 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.

[0036] 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 gear ring 33, so that the rotary kiln 2 drives the support ring 34 to rotate on the mounting frame 1 to prepare for roasting.

[0037] 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 rotating ring 46, an electric telescopic rod 47, a smoothing plate 48 and a rotating disk 49. The fixed end of the output motor 41 is fixedly installed on the outer surface of the feed box 11, and the output end of the output motor 41 extends into the rotary kiln 2 and is fixedly connected to the rotating rod 42. The half gear 43 is fixedly installed 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 ring 46. The rotating ring 46 is rotatably installed in the rotary kiln 2. The fixed end of the electric telescopic rod 47 is fixedly installed 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 installed on the outer surface of the rotating rod 42 through the rotating disk 49. The rotating rod 42 is slidably connected to the fixed feeding unit 6.

[0038] 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 foundation, the second electrode plate 414 is fixedly installed on the end of the half 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 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.

[0039] 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 mesh and rotate. When the half gear 43 is meshed 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 the protruding raw materials accumulated inside the rotary kiln 2 and push the excess raw materials at the protrusions to the recessed parts, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln 2, avoiding uneven burning resulting in large temperature differences, and generating nodules inside the rotary kiln 2, which affects 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. The detection bent plate 411 contacts the inner wall of the rotary kiln 2 during the rotation. When a nodule is encountered on the inner wall of the rotary kiln 2, the protrusion of the nodule squeezes the detection bent plate 411 and moves downward to compress 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.

[0040] like Figure 3 , 4 As shown, the waste heat recovery unit 5 includes 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 goes deep into the feed box 11 to contact the raw materials.

[0041] The flue gas containing heat generated during the production and roasting process of sodium dichromate 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 conduction pipe 53 to preheat the raw materials, thereby realizing the recovery and utilization of the heat in the flue gas.

[0042] like Figure 6 , 9As shown, 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 installed 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, and the ring plate 66 is fixedly connected to the push plate 61 through a round rod.

[0043] During the rotation of the rotating rod 42, the ring plate 66 is driven to rotate under the transmission action of the straight plate 67, and the memory metal plate 63 is driven to rotate during the rotation of the ring plate 66, so as to stir the raw materials in 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 is deformed and bends inwards, and the baffle 65 is pushed to open under the transmission action of the arc rod 64. On the other hand, the compression of the telescopic spring 62 is released during the inward bending of the memory metal plate 63. Under the action of the restoring force of the telescopic spring 62, the push plate 61 is pushed to move to the left to push the preheated raw materials into the rotary kiln 2, and a quantitative feeding is performed, 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 in the raw materials.

[0044] like Figure 6 , 9 As shown, a material blocking plate is provided on the caressing plate 48 .

[0045] During the operation of the rotary kiln 2, the 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 48, the baffle plate can be used to block the bulged raw materials and push them 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 in a relatively uniform state, avoiding local raw materials from being too thick or too thin, ensuring the uniform distribution of the raw materials in the entire rotary kiln 2, and providing stable conditions for the subsequent roasting reaction.

[0046] like Figure 2 , 6 As shown, the driving motor 31 and the output motor 41 rotate in opposite directions.

[0047] 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 comb and flatten the raw materials more effectively. Under the effect of relative movement, the smoothing plate 48 can flatten the protruding areas of the raw materials and fill the sunken 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.

[0048] 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, and the expansion coefficient of the outer memory metal sheet is greater than that of the inner memory metal sheet.

[0049] 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 speeding up the production process of sodium dichromate, and then improving the production efficiency of sodium dichromate, while reducing the inconsistency of material reactions caused by temperature differences, avoiding problems such as material accumulation or nodules caused by too low raw material temperature, and further ensuring the uniformity of product quality.

[0050] Working principle of the present invention: The staff passes the raw materials into the feed box 11 for preheating in preparation 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.

[0051] 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 gear ring 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 gear ring 44 to mesh and rotate. When the half gear 43 is meshed with the half gear ring 44, the half ring swings, and the rotating ring 46 is driven 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 the raw materials piled up and protruding inside the rotary kiln 2, and push the excess raw materials at the protruding part to the concave part, thereby improving the uniformity of the distribution of the raw materials inside the rotary kiln 2 and avoiding Uneven burning leads to a large difference in temperature difference, which generates nodules inside the rotary kiln 2, affecting the production quality. During the rotation of the rotating 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. The detection bent plate 411 contacts the inner wall of the rotary kiln 2 during 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 to compress 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.

[0052] The flue gas containing heat generated during the production and roasting process of sodium dichromate 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 conduction pipe 53 to preheat the raw materials, thereby realizing the recovery and utilization of the heat in the flue gas.

[0053] During the rotation of the rotating rod 42, the ring plate 66 is driven to rotate under the transmission of the straight plate 67. During the rotation of the ring plate 66, the memory metal plate 63 is driven to rotate, and the raw materials in the feed box 11 are stirred. When the memory metal plate 63 contacts the raw materials that have reached the preset temperature range, the memory metal plate 63 is deformed and bent inwards, and the baffle 65 is pushed to open under the transmission of the arc rod 64. On the other hand, the compression of the telescopic spring 62 is released during the inward bending of the memory metal plate 63. Under the action of the restoring force of the telescopic spring 62, the push plate 61 is pushed to move to the left to push the preheated raw materials into the rotary kiln 2, and a quantitative feeding is performed, 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 of the raw materials.

[0054] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered 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 in that: 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 dosing 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 dosing 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 dosing unit (6) is fixedly connected to the detection and scraping unit (4), and the fixed dosing unit (6) has the function of quantitatively dosing preheated raw materials.

2. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 1, characterized in that: A material input box (11) is fixedly mounted on one side of the mounting frame (1), and a material output 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 material output box (12); one end of the rotary kiln (2) is rotatably connected to the material input box (11), and the other end is rotatably connected to the material output box (12); the mounting frame (1) is provided with a supporting roller, and the material input box (11) is fixedly connected to the detection and scraping unit (4).

3. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production 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 meshingly 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 a support roller of the mounting frame (1).

4. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 2, characterized in that: The detection and scraping unit (4) comprises 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); 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) and the half gear ring (44) are connected to each other. The connecting rod (45) is meshedly connected with the half gear ring (44), one end of the connecting rod (45) is fixedly connected with the half gear ring (44), and the other end is fixedly connected with the rotating ring (46), the rotating ring (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 with 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 a rotating disk (49), and the rotating rod (42) is slidably connected to the fixed injection unit (6).

5. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 4, characterized in that: The detection and scraping unit (4) further comprises a bent 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 bent rod (410) is fixedly connected to the rotating rod (42); a fixed end of the spring telescopic rod (412) is fixedly mounted on the bent rod (410); a telescopic end of the spring telescopic rod (412) is fixedly connected to the detection bent plate (411); and the first electrode plate (413) is fixedly mounted on the rotating rod (42). The second electrode plate (414) is 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 an 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 a 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).

6. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 1, characterized in that: 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 material.

7. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 4, characterized in that: The fixed feeding unit (6) comprises 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) via a torsion spring; the ring plate (66) is fixedly connected to the rotating rod (42) via the straight plate (67); and the ring plate (66) is fixedly connected to the push plate (61) via a round rod.

8. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 4, characterized in that: A material blocking plate is arranged on the smoothing plate (48).

9. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 3, characterized in that: The driving motor (31) and the output motor (41) rotate in opposite directions.

10. The device for recovering and utilizing the waste heat from roasting of sodium dichromate production according to claim 7, 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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