Solid-phase heat energy recovery energy-saving device

Abstract

A solid-phase heat energy recovery energy-saving device, which relates to the technical field of solid-phase reaction devices. The device comprises a rotary kiln driving mechanism (36), and a rotary kiln inner barrel (24) and a rotary kiln outer barrel (32) which are fixed to each other, wherein the rotary kiln outer barrel (32) is sleeved on an outer side of the rotary kiln inner barrel (24); the rotary kiln driving mechanism (36) is configured to drive the rotary kiln inner barrel (24) and the rotary kiln outer barrel (32) to rotate; and a feeding mechanism is mounted at a first end of the rotary kiln inner barrel (24), a discharging mechanism is provided at a second end of the rotary kiln outer barrel (32), a rotary kiln inner barrel helical blade (25) is mounted in the rotary kiln inner barrel (24), an electric heating mechanism (31) is mounted at a first end of the rotary kiln outer barrel (32), and a rotary kiln outer barrel helical blade (33) is provided between an inner wall of the rotary kiln outer barrel (32) and an outer wall of the rotary kiln inner barrel (24). On the basis of the technical solution, the solid-phase heat energy recovery energy-saving device can efficiently recover all waste heat of high-temperature materials, there is no need to provide heat or there is a need to provide very little heat to the whole device after being started, and there is no need to consume cooling water to cool the materials.

Description

Solid phase heat energy recovery energy-saving device TECHNICAL FIELD

[0001] The present application relates to the technical field of solid phase reaction device, and particularly relates to a solid phase heat energy direct recovery energy-saving device. BACKGROUND

[0002] The rotary kiln is a key equipment with large production capacity, strong adaptability to raw materials and continuous production, and is widely used in various industries, such as cement, metallurgy, chemical industry, mining, environmental protection and the like. However, the rotary kiln also has many shortcomings, such as large equipment area, large construction investment, large heat loss, high energy consumption and the like, which need to be solved through technical innovation. The main reasons are as follows: 1, the kiln tail high-temperature flue gas carries away a large amount of heat; 2, the large furnace body has a large heat dissipation area, and most of them do not have an outer layer of insulation, and emit a large amount of heat; 3, the temperature of the material after reaction is very high (usually 700-1200℃), and a large amount of heat energy is not fully utilized, especially for the rotary kiln which needs inert or reducing atmosphere protection, the waste heat is basically cooled by the material in a sealed water-cooled way, which not only wastes heat energy but also wastes water.

[0003] Example one: a magnetization reduction roasting method of siderite rotary kiln, comprising the following steps: ① crushing the siderite into a particle size less than or equal to 0.9mm; ② mixing the raw material powder from the tail section of the rotary furnace into the rotary furnace, and having a burner to spray coal powder from the front section of the rotary furnace into the rotary furnace to roast the mixed raw material powder in the rotary furnace, the roasting temperature is 650-850℃, the roasting temperature time is 30-80 minutes, and the tail gas is discharged from the exhaust port of the tail section of the rotary furnace; ③ the iron ore powder after calcination in the rotary furnace is discharged from the front section of the rotary furnace to the cooling pool for water quenching, and the finished product iron ore powder is obtained. In the above list: the rotary kiln tail gas carries away a large amount of heat, the high-temperature iron ore powder after calcination in the rotary kiln is discharged to the cooling pool for water quenching, and a large amount of heat of the high-temperature iron ore powder is wasted, and on the other side, the burner continuously sprays coal powder into the rotary furnace to maintain the reaction temperature.

[0004] Example two: a manganese dioxide reduction roasting method, the steps are as follows: ① the manganese dioxide ore is crushed and ground to a particle size of less than 100 mesh; ② the manganese dioxide ore powder and carbon powder are mixed into a rotary kiln for reduction roasting, and the high-temperature gas generated after the natural gas is burned by the burner is sprayed into the rotary kiln to heat and roast the manganese dioxide ore powder and carbon powder mixture, the roasting temperature is 850-900℃, the high-temperature reaction time is 40-60 minutes, and the reaction tail gas is discharged from the exhaust port of the rotary kiln; ③ the reacted material is discharged from the front end of the rotary kiln to the cooler in a sealed manner, and is indirectly water-cooled to about 60℃. In the above example two: the exhaust gas from the rotary kiln carries away a large amount of heat, the high-temperature manganese monoxide powder after roasting from the rotary kiln is discharged to the cooler and is indirectly water-cooled to about 60℃, a large amount of heat of the high-temperature manganese monoxide powder is wasted, and cooling water is also consumed. On the other hand, a large amount of natural gas is burned to supplement heat to the rotary kiln.

[0005] A large amount of research has been done in this regard by previous technology workers, such as: patent CN115507645A discloses a cylinder multi-section controllable temperature preheating, calcining and cooling integrated energy-saving rotary kiln, the cylinder multi-section controllable temperature preheating, but the waste heat is wasted and not utilized. CN116202314A discloses a kiln atmosphere pressure controllable external heating type energy-saving rotary kiln, which has atmosphere protection but no heat recovery. CN218349203U discloses an environmental protection and energy-saving rotary kiln with high waste heat utilization rate. CN218994002U discloses an energy-saving rotary kiln with a preheating device, which has a hot air waste heat recovery device, but the recovered heat is very limited. CN105890346A discloses a countercurrent heat exchange manganese dioxide reduction rotary kiln, which has a preheating process for raw materials, but the hot material is on the top and the material to be preheated is on the bottom, and the material does not turn over during the travel, so the heat transfer effect is poor; the material is difficult to be squeezed into the inner cylinder by the spiral blade in the sleeve, and is easy to be blocked; the floating sleeve does not rotate with the rotary kiln, the high-temperature end is difficult to seal, and the heat is easily lost; the discharge temperature of the rotary kiln is 250℃, the material is directly water-cooled, the heat is taken away by water, and cooling water is also consumed, the flue gas waste heat is not utilized, and the waste heat recovery is not sufficient; in addition, a large amount of CO2 gas generated by the reduction reaction is discharged into the atmosphere through the gaps, which causes unorganized emission pollution to the environment. Therefore, it is urgent to solve the problems of large heat loss and high energy consumption of the rotary kiln. SUMMARY

[0006] In view of the problems in the prior art, the present application provides a solid phase heat energy recovery energy-saving device, which can effectively utilize a large amount of heat generated by solid phase reaction, thereby reducing the consumption of heating fuel and cooling water.

[0007] The application provides a solid-phase heat energy recycling and energy-saving device, which comprises a rotary kiln, the rotary kiln comprises a rotary kiln driving mechanism and a rotary kiln inner cylinder and a rotary kiln outer cylinder fixed with each other, the rotary kiln outer cylinder is sleeved outside the rotary kiln inner cylinder, the rotary kiln driving mechanism is used for driving the rotary kiln inner cylinder and the rotary kiln outer cylinder to rotate, a feeding mechanism is installed at the first end of the rotary kiln inner cylinder, and a material rotating mechanism is arranged at the second end of the rotary kiln inner cylinder.

[0008] The feeding mechanism can feed raw materials to the first end of the rotary kiln inner cylinder, the rotary kiln inner cylinder is provided with rotary kiln inner cylinder spiral blades, the rotary kiln inner cylinder rotates to drive the rotary kiln inner cylinder spiral blades to convey the raw materials to the second end of the rotary kiln inner cylinder and then drop to the first end of the rotary kiln outer cylinder, the first end of the rotary kiln outer cylinder is provided with an electric heating mechanism, the electric heating mechanism can heat the raw materials dropped to the first end of the rotary kiln outer cylinder to make the raw materials react, the rotary kiln outer cylinder is provided with rotary kiln outer cylinder spiral blades between the inner wall of the rotary kiln outer cylinder and the outer wall of the rotary kiln inner cylinder, and the rotary kiln outer cylinder rotates to drive the rotary kiln outer cylinder spiral blades to convey the reacted materials to the second end of the rotary kiln outer cylinder and then discharge the materials through the discharging mechanism.

[0009] As a further improvement of the above technical solution:

[0010] The solid-phase heat energy recycling and energy-saving device further comprises that the rotary kiln inner cylinder spiral blades are fixed to the inner side wall of the rotary kiln inner cylinder, the outer side of the rotary kiln outer cylinder spiral blades is fixed to the inner side wall of the rotary kiln outer cylinder, and the inner side of the rotary kiln outer cylinder spiral blades is fixed to the outer side wall of the rotary kiln inner cylinder. The rotary kiln inner cylinder, the rotary kiln outer cylinder and the rotary kiln outer cylinder spiral blades form a large spiral space, the materials divide the spiral space into a plurality of relatively closed small spaces, and the heat of the small spaces is exchanged in the local range, so that the high-temperature heat is prevented from flowing to the low-temperature area to reduce the heat efficiency.

[0011] The solid-phase heat energy recycling and energy-saving device further comprises that the discharging mechanism comprises a rotary kiln outer cylinder rotary sealing sleeve and a rotary kiln discharge hopper, the rotary kiln outer cylinder rotary sealing sleeve is sleeved on the rotary kiln outer cylinder, the rotary kiln outer cylinder can rotate relative to the rotary kiln outer cylinder rotary sealing sleeve, the rotary kiln discharge hopper is installed on the lower side of the rotary kiln outer cylinder rotary sealing sleeve, and the rotary kiln outer cylinder rotates to drive the rotary kiln outer cylinder spiral blades to convey the reacted materials to the rotary kiln outer cylinder rotary sealing sleeve and then discharge the materials through the rotary kiln discharge hopper.

[0012] The solid-phase heat energy recycling energy-saving device further comprises a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover, the rotary kiln inner cylinder rotary sealing end cover is arranged at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover; the rotary kiln feeding pipe is in communication with the rotary kiln inner cylinder rotary sealing end cover, and raw materials in the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

[0013] The solid-phase heat energy recycling energy-saving device further comprises a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover, the rotary kiln inner cylinder rotary sealing end cover is arranged at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover; the rotary kiln feeding pipe is in communication with the rotary kiln inner cylinder rotary sealing end cover, and raw materials in the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

[0014] The solid-phase heat energy recycling energy-saving device further comprises a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover, the rotary kiln inner cylinder rotary sealing end cover is arranged at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover; the rotary kiln feeding pipe is in communication with the rotary kiln inner cylinder rotary sealing end cover, and raw materials in the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

[0015] The solid-phase heat energy recycling energy-saving device further comprises a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover, the rotary kiln inner cylinder rotary sealing end cover is arranged at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover; the rotary kiln feeding pipe is in communication with the rotary kiln inner cylinder rotary sealing end cover, and raw materials in the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

[0016] The solid-phase heat energy recycling energy-saving device further comprises a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover, the rotary kiln inner cylinder rotary sealing end cover is arranged at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover; the rotary kiln feeding pipe is in communication with the rotary kiln inner cylinder rotary sealing end cover, and raw materials in the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

[0017] The solid-phase heat energy recycling and energy-saving device further comprises a low-temperature waste heat recycling multi-tube cooler, the low-temperature waste heat recycling multi-tube cooler comprises a multi-tube cooler feeding screw mechanism, a multi-tube cooler shell, a multi-tube cooler cooling tube, a multi-tube cooler driving mechanism, a multi-tube cooler rear rotary seal and a multi-tube cooler discharge pipe, the multi-tube cooler feeding screw mechanism can convey the material discharged from the discharging mechanism to the multi-tube cooler shell and discharge the material from the multi-tube cooler discharge pipe, the multi-tube cooler cooling tube is installed in the multi-tube cooler shell for cooling the material in the multi-tube cooler shell, the multi-tube cooler rear rotary seal is installed at the discharge end of the multi-tube cooler shell, and the multi-tube cooler driving mechanism is used to drive the multi-tube cooler shell to rotate.

[0018] The solid-phase heat energy recycling and energy-saving device further comprises that a cooling tube inner spiral piece is installed in the multi-tube cooler cooling tube, and a multi-tube cooler hot air discharge pipe is installed at the feeding end of the multi-tube cooler shell, and the gas flow passing through the multi-tube cooler cooling tube can be discharged from the multi-tube cooler hot air discharge pipe.

[0019] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present application can be achieved.

[0020] The solid-phase heat energy recycling and energy-saving device provided by the present application has at least the following beneficial effects compared with the prior art: during operation, the rotary kiln driving mechanism drives the fixed rotary kiln inner cylinder and rotary kiln outer cylinder to rotate, the raw materials mixed in a certain proportion are fed into the first end of the rotary kiln inner cylinder through the feeding mechanism, the rotary kiln inner cylinder rotates to make the rotary kiln inner cylinder spiral piece convey the raw materials to the second end of the rotary kiln inner cylinder and drop into the first end of the rotary kiln outer cylinder, the electric heating mechanism heats the raw materials dropped into the first end of the rotary kiln outer cylinder to make the raw materials react, and the rotary kiln outer cylinder rotates to make the rotary kiln outer cylinder spiral piece convey the reacted raw materials to the second end of the rotary kiln outer cylinder and discharge the raw materials through the discharging mechanism.

[0021] When the solid-phase heat energy recovery and energy-saving device starts to work, since there is no raw material to react and release heat, the electric heating mechanism needs to consume more energy to heat the raw material dropped to the first end of the rotary kiln outer cylinder to make the raw material react. As the reaction proceeds, the raw material between the spiral pieces of the rotary kiln outer cylinder reacts and releases a large amount of heat, which heats the raw material in the rotary kiln inner cylinder, thereby reducing the energy required by the electric heating mechanism to heat the raw material dropped to the first end of the rotary kiln outer cylinder to make the raw material react. The temperature of the material between the spiral blades gradually decreases from the first end to the second end of the rotary kiln outer cylinder, while the temperature of the material between the spiral blades of the rotary kiln inner cylinder gradually increases from the first end to the second end of the rotary kiln inner cylinder. This allows the material between the spiral blades of the rotary kiln inner cylinder to exchange heat with the material between the spiral blades of the rotary kiln outer cylinder as much as possible. In other words, the heat of the material between the spiral blades of the rotary kiln outer cylinder is absorbed as much as possible by the material between the spiral blades of the rotary kiln inner cylinder, thereby further reducing the energy required by the electric heating mechanism to heat the raw materials dropped to the first end of the rotary kiln outer cylinder to cause the raw materials to react. In addition, in this solid-phase heat energy recovery and energy-saving device, due to the action of gravity, the material will accumulate below the spiral blades of the rotary kiln outer cylinder and the spiral blades of the rotary kiln inner cylinder, and the material between the spiral blades of the rotary kiln outer cylinder is located below the material between the spiral blades of the rotary kiln inner cylinder, which further facilitates the thermal radiation heat exchange between the material between the spiral blades of the rotary kiln outer cylinder and the material between the spiral blades of the rotary kiln inner cylinder.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0024] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0025] FIG1 shows a schematic structural diagram of a solid-phase heat energy recovery and energy-saving device provided by an embodiment of the present invention;

[0026] FIG2 shows a schematic structural diagram of a rotary kiln of a solid-phase heat energy recovery and energy-saving device provided by an embodiment of the present invention;

[0027] FIG3 shows a schematic diagram of the scraper structure of the inner and outer cylinders of the rotary kiln of the solid-phase heat energy recovery and energy-saving device provided by an embodiment of the present invention;

[0028] Figure 4 shows a structural schematic diagram of a waste heat dryer of the solid-phase heat energy recycling energy-saving device according to an embodiment of the present application;

[0029] Figure 5 shows a structural schematic diagram of a low-temperature waste heat recycling multi-tube cooler of the solid-phase heat energy recycling energy-saving device according to an embodiment of the present application.

[0030] In the drawings, the same components are designated by the same reference numerals throughout. The drawings are not drawn to scale.

[0031] Explanation of reference numerals:

[0032] 1 - metering feeding mechanism, 2 - dryer exhaust pipe, 3 - front sealing end cover of dryer, 4 - drying cylinder, 5 - scraper, 6 - dryer driving mechanism, 7 - rear sealing end cover of dryer, 8 - dryer discharge pipe, 20 - rotary kiln exhaust pipe, 21 - rotary kiln feeding pipe, 22 - rotary kiln feeding end observation hole, 23 - rotary kiln inner cylinder rotating sealing end cover, 24 - rotary kiln inner cylinder, 25 - rotary kiln inner cylinder helical blade, 26 - scraper, 27 - rotary kiln outer cylinder end cover, 28 - explosion-proof port, 29 - electric brush, 30 - camera observation hole, 31 - electric heating mechanism, 32 - rotary kiln outer cylinder, 33 - rotary kiln outer cylinder helical blade, 34 - wireless temperature measuring device of each zone, 35 - rotary kiln insulation layer, 36 - rotary kiln driving mechanism, 37 - rotary kiln outer cylinder rotating sealing sleeve, 38 - rotary kiln discharge bin level sensor, 39 - rotary kiln discharge hopper, 51 - multi-tube cooler feeding helical mechanism, 52 - multi-tube cooler hot air discharge pipe, 53 - multi-tube cooler hot air induced draft fan, 54 - front sealing end cover of multi-tube cooler, 55 - multi-tube cooler shell, 56 - multi-tube cooler cooling pipe, 57 - helical blade inside cooling pipe, 58 - multi-tube cooler driving mechanism, 59 - rear rotating sealing of multi-tube cooler, 60 - multi-tube cooler discharge pipe, 61 - multi-tube cooler cold air inlet pipe. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0034] The present application will be further described below with reference to the accompanying drawings.

[0035] The embodiment of the present application provides a solid phase heat energy recycling energy-saving device, which can effectively utilize the waste heat of the reacted material and the waste heat of the flue gas, and further achieves normal operation without external energy supply or with little energy supply after starting. Referring to FIGS. 1 to 5, the specific content is as follows: the material enters the rotary drying cylinder 4 through the metering feeding mechanism 1, the material in the drying cylinder is lifted by the lifter plate 5 and contacted with the hot air of the flue gas and the low-temperature waste heat recovery to exchange heat, so as to dry and preheat the material; the hot air and the flue gas are discharged to the tail gas treatment through the drying machine front sealing end cover 3 and the drying machine exhaust pipe 2, and the drying machine driving mechanism 6 drives the drying machine to rotate continuously to lift the material. The dried material enters the rotary kiln inner cylinder 24 through the drying machine rear sealing end cover 7, the drying machine discharge pipe 8, the rotary kiln feeding pipe 21 and the rotary kiln inner cylinder rotating sealing end cover 23.

[0036] The material in the rotary kiln inner cylinder is turned and spirally advanced under the joint action of the rotary motion, the rotary kiln inner cylinder helical blade 25 and the scraper 26, is continuously preheated by the high-temperature material in the outer cylinder in the advancing process, and the temperature is continuously increased, when the temperature reaches the reaction temperature, the material starts to react and releases heat, when the material reaches the other end of the rotary kiln inner cylinder, the temperature approaches the temperature of the outer cylinder, and the material naturally falls to the first end of the rotary outer cylinder 32 under the rotation of the helical blade in the rotary inner cylinder and the action of gravity, the first end cover 27 of the rotary kiln outer cylinder is airtight structure, and the end face is provided with the explosion-proof port 28, the electric brush 29 and the camera observation hole 30. The electric heating device 31 outside the rotary kiln outer cylinder supplements heat to the system when the temperature in the kiln high-temperature section is lower than the set temperature, the high-temperature material after reaction in the rotary kiln outer cylinder moves to the rotary kiln rotating sealing sleeve 37 and the discharge hopper 39 at the other end of the rotary kiln outer cylinder under the action of the rotary kiln outer cylinder helical blade 33, and each zone of the rotary kiln outer cylinder is provided with a wireless temperature measuring device 34, a rotary kiln insulation layer 35 and a rotary kiln driving mechanism 36. The material in the rotary kiln outer cylinder is turned and spirally advanced under the joint action of the rotary motion, the rotary kiln outer cylinder helical blade 33 and the scraper 26, is continuously cooled and releases heat in the advancing process, and at the same time, the material in the rotary inner cylinder is preheated through the convection of the gas in the jacket, the radiation of the high-temperature material and the heat conduction of the outer cylinder helical blade, when the material reaches the discharge hopper 39 at the other end of the rotary kiln outer cylinder, the temperature is about 200 DEG C. The flue gas generated by the rotary kiln reaction is introduced into the drying machine or the mill to dry and preheat the material through the exhaust pipe 20.

[0037] After the material enters the rotary kiln discharge bin, the bin material level sensor 38 transmits the material height to the control system, and the multi-tube cooler feed screw mechanism 51 is automatically adjusted according to the material height to convey the material to the multi-tube cooler cooling cavity. Under the drive of the multi-tube cooler drive mechanism 58, the material rolls forward in the multi-tube cooler composed of the multi-tube cooler shell 55 and the multi-tube cooler cooling pipe 56, and continues to cool to about 60°C. After the multi-tube cooler, the rotary seal 59 and the multi-tube cooler discharge pipe 60 discharge the material to the bin. The cold air enters the multi-tube cooler cooling pipe 56 through the multi-tube cooler cold air inlet pipe 61. The cold air advances in the pipe along the cooling pipe internal spiral fin 57, cools the material while increasing its temperature to become hot air. The hot air is sent to the dryer air inlet through the cooler front seal end cover 54, the multi-tube cooler hot air outlet pipe 52 and the multi-tube cooler hot air induced draft fan 53 for drying the material. The entire heat recovery of the high-temperature and low-temperature parts of the material is completed, allowing the high-energy consumption rotary kiln to operate continuously without the need for external heat or with very little heat.

[0038] The solid-phase heat energy recovery and energy-saving device is composed of a waste heat dryer, a high-temperature solid-phase waste heat recovery rotary kiln and a low-temperature waste heat recovery multi-tube cooler. The purpose is to fully recover the heat of the hot air from the low-temperature waste heat recovery of the flue gas and the material and the heat of the high-temperature solid phase after the reaction, and to utilize the heat in stages.

[0039] At present, efficient recovery of high-temperature discharge heat energy of the rotary kiln is still a difficult problem. Most of the recovery is a little hot air or hot water, and the recovery efficiency is very low. It is more difficult to recover the waste heat of the rotary kiln whose discharge needs to be cooled in an atmosphere. It is hoped that the feed of the rotary kiln can be preheated, the higher the feed temperature, the more energy-saving. The discharge after the reaction needs to be cooled or cooled in an atmosphere. The general rotary kiln is a straight-through type design, with one end for feeding and the other end for discharging. The cold and hot materials are far apart. Even if measures are taken to recover heat, the heat utilization rate is low. The energy-saving rotary kiln of the present application ingeniously uses the inner and outer cylinder way and the guiding effect of the rotary spiral fin, so that the high-temperature solid-phase material after the reaction exchanges heat with the low-temperature material that needs to be preheated. The biggest advantage is that the preheating temperature is high and the heat loss is small. In order to further recover the low-temperature waste heat and reduce the discharge temperature, a low-temperature waste heat recovery part composed of a waste heat dryer and an indirect multi-tube air cooling cooler is added to reduce the humidity of the material entering the rotary kiln and increase the temperature of the material entering the rotary kiln.

[0040] The energy-saving rotary kiln, the rotary inner cylinder and the rotary outer cylinder are fixed together through the spiral fin between the inner and outer cylinders. The spiral fin has the effect of increasing the heat transfer coefficient like heat transfer fins. The rotary inner cylinder and the rotary outer cylinder are fixed together and rotate to enhance the structural strength of the cylinder body and reduce deformation and cracking.

[0041] The directions of the helical pieces of the rotary inner cylinder and the rotary outer cylinder of the energy-saving rotary kiln are opposite. When the rotary kiln rotates as a whole, the materials in the inner cylinder move from the feeding pipe to the reaction end, and the materials in the outer cylinder move from the reaction end to the discharging pipe, so that the cold and hot materials move in opposite directions, and the preheating temperature of the materials is maximized.

[0042] The inner side of the rotary inner cylinder and the inner side of the rotary outer cylinder are both circumferentially provided with axial scrapers, so that the materials are constantly turned over when the rotary kiln rotates, preventing the materials from sliding forward as a whole, and preventing the temperature inside and outside the materials from being uneven, thereby affecting heat exchange.

[0043] Due to the need for reaction exhaust, only about 20-25% of the cross section of the materials in the rotary cylinder is occupied. Under the action of gravity, the materials in the inner and outer cylinders are both at the bottom of the respective cylinder, i.e. the materials in the rotary inner cylinder are just above the high-temperature materials in the rotary outer cylinder, the heat transfer effect is good, the materials in the rotary inner cylinder are constantly heated by the materials in the rotary outer cylinder during the movement, and the materials in the rotary outer cylinder release heat and are cooled, the high-temperature waste heat of the materials after the reaction is recovered, and the preheating temperature of the materials is maximized.

[0044] The materials in the rotary inner cylinder of the energy-saving rotary kiln are transported to the end of the rotary inner cylinder under the action of the helical pieces and rotation, and naturally fall into the rotary outer cylinder under the action of gravity. The materials falling into the rotary outer cylinder change direction to continue moving in the opposite direction under the action of the outer cylinder helical pieces, and the direction of the materials is changed.

[0045] The heating elements of the energy-saving rotary kiln are fixed on the reaction end of the outer cylinder of the rotary kiln and are uniformly distributed in the circumferential direction. When in operation, the heating elements rotate together with the kiln body. The heating elements and the outer part of the rotary outer cylinder have a heat preservation layer, which is different from the structure of the furnace chamber. The furnace chamber does not move, and the rotary kiln rotates. The gap heat loss is large. The heating elements and the rotary outer cylinder are integrated and installed with heat preservation, which greatly reduces heat loss.

[0046] Since there is no furnace chamber in the energy-saving rotary kiln, the temperature measuring devices and the observation hole videos of each zone of the rotary kiln all use wireless transmission signals. The cable layout is simple, and only the power line is co-linear with the heating elements.

[0047] The discharge hopper of the energy-saving rotary kiln is provided with a material level sensor. The material level sensor is linked with the multi-tube cooler feeding screw mechanism, so that the material level of the discharge hopper is kept constant. In addition, the sealing effect of the cooler feeding screw device makes the rotary kiln have double air tightness.

[0048] The multi-tube cooler in the solid-phase heat energy recovery energy-saving device is composed of multiple cooling tubes and a cylinder. The materials pass outside the tubes, and the air passes inside the tubes. The multi-tube structure greatly increases the heat exchange surface. Compared with the single-cylinder cooler commonly used at present, the heat exchange area is increased by several tens of times. Proper gaps are left between the cooling tubes to facilitate the flow of materials outside the tubes during the rotation of the cylinder, thereby improving the heat exchange coefficient.

[0049] The discharge pipe of the multi-tube cooler in the solid-phase heat energy recovery energy-saving device is in the center of the end of the cylinder, so that most of the cooling pipes in the cooler cylinder are immersed in the material, thereby improving the heat exchange effect.

[0050] The multi-tube cooler in the solid-phase heat energy recovery energy-saving device has multiple layers of cooling pipes distributed along the circumference of the cylinder, and metal spiral fins are arranged in the cooling pipes, with the side of the metal spiral fins closely attached to the inner wall of the cooling pipe, similar to finned tubes, thereby increasing the heat exchange surface. After the air enters the cooling pipe, it advances along the spiral line of the spiral fins under the induction of the spiral fins, thereby increasing the Reynolds number and increasing the heat exchange coefficient of the air and the material.

[0051] The cylinder of the waste heat dryer in the solid-phase heat energy recovery energy-saving device is deflected downward by 3-6° from the feeding direction, facilitating the control of the residence time of the material in the waste heat dryer; the high-temperature solid-phase waste heat recovery rotary kiln is deflected upward by 3-10° from the feeding direction, with the reaction end being higher than the feeding end. Since hot gas has a smaller density than cold gas, the high-temperature reducing gas accumulates at the reaction end, preventing the escape of high-temperature gas and the loss of heat; the multi-tube cooler is deflected downward by 3-6° from the feeding direction, facilitating the control of the residence time of the material in the multi-tube cooler and allowing the material to cool to a set temperature.

[0052] The following describes an embodiment of the present application in detail. The equipment of the embodiment is shown in the accompanying drawings. For example, the present device is used to mix and heat manganese dioxide ore powder and carbon powder to reduce and roast them into manganese monoxide. The reduction of manganese dioxide in real manganese ore to manganese monoxide by carbon is an exothermic reaction, and the heat generated by the reaction is equivalent to heating the material to about 500°C. The reaction temperature of manganese dioxide and carbon to reduce manganese monoxide is 800-900°C. If there is no waste heat recovery, the heat carried away by the material is more than the heat generated, and the temperature of the material will continuously decrease, so the reaction cannot continue. If the waste heat recovery method is used (i.e., the high-temperature manganese monoxide generated after the reaction is used to preheat the mixture of manganese dioxide and carbon powder), theoretically, as long as the manganese dioxide is preheated to above 400°C, and the reaction heat is added, the reduction reaction of manganese dioxide can be maintained. High-temperature manganese monoxide will be oxidized immediately when it comes into contact with air, so direct air cooling cannot be used to preheat manganese dioxide, and only indirect preheating of manganese dioxide in a sealed environment can be used. Therefore, preheating is difficult and requires high standards. The waste heat recovery system of the present application can preheat manganese dioxide to above 500°C. Even if the rotary kiln has a small amount of heat loss, the system can maintain normal operation without external heat energy supply. The high-energy-consumption rotary kiln (about 500 degrees of electricity is consumed per ton of product for drying and reduction) is converted into an energy-saving rotary kiln that does not require external heat energy after starting.

[0053] To achieve the above-mentioned efficient energy recovery, the specific implementation steps are as follows: the mixed manganese dioxide ore powder and carbon powder mixture (manganese dioxide particle size less than 100 mesh accounts for 95%, carbon powder accounts for 10%, normal temperature, moisture 10%) is loaded into the hopper, and after metering, it enters the rotary drying cylinder 4. In the drying cylinder, the manganese dioxide ore powder and carbon powder mixture is further stirred uniformly by the lifting plate 5, and is in contact with the flue gas and the hot air recovered from the low-temperature waste heat of the reacted manganese monoxide to dry and preheat the manganese powder and carbon powder mixture. The tail gas is discharged through the drying machine exhaust pipe 2 to the tail gas treatment place. The drying machine continuously rotates to lift the material, and the temperature of the dried manganese powder and carbon powder mixture reaches 100°C, and the moisture is less than 1%.

[0054] The manganese powder mixture is sealed by the end cover 7 of the drying machine, the drying machine discharge pipe 8, the rotary kiln feed pipe 21 and the rotary kiln inner cylinder rotary sealing end cover 23, and enters the rotary kiln inner cylinder 24. The manganese powder and carbon powder mixture in the rotary kiln inner cylinder is turned and advanced along the adjacent helical grooves under the combined action of the rotary motion, the helical blade 25 and the scraper 26 in the rotary kiln inner cylinder. In the advancing process, it is continuously preheated by the high-temperature manganese monoxide in the outer cylinder, and the temperature is continuously increased. When the manganese dioxide is preheated to near 800°C, it starts to react and releases heat. The high-temperature reaction time is 40-60 minutes. When the manganese dioxide reaches the other end of the rotary kiln inner cylinder, the temperature is close to the temperature of the outer cylinder 900°C. Under the action of the rotation of the helical blade in the rotary inner cylinder and gravity, it naturally falls to the first end of the rotary outer cylinder 32. The electric heating device 31 outside the rotary kiln outer cylinder supplements heat to the system when it is started or the temperature in the high-temperature section of the kiln is lower than 870°C (normal condition does not require). The reacted high-temperature manganese monoxide in the rotary kiln outer cylinder moves to the rotary kiln outer cylinder rotary sealing sleeve 37 and the discharge hopper 39 at the other end of the rotary kiln outer cylinder under the action of the helical blade 33 in the rotary kiln outer cylinder, and the temperature of the wireless temperature measuring device 34 in each zone of the rotary kiln outer cylinder is observed. The manganese monoxide in the rotary kiln outer cylinder is turned and advanced along the helical under the combined action of the rotary motion, the helical blade 33 and the scraper 26 in the rotary kiln outer cylinder. In the advancing process, it continuously releases heat while preheating the manganese powder and carbon powder mixture in the rotary inner cylinder through the convection of the gas in the jacket, the radiation of the high-temperature manganese monoxide and the heat conduction of the outer cylinder helical blade. When the manganese monoxide reaches the discharge hopper 39 at the other end of the rotary kiln outer cylinder, the temperature is about 200°C.

[0055] The manganese monoxide from the rotary kiln enters the discharge bin of the rotary kiln, and the bin level sensor 38 transmits the manganese monoxide level signal to the control system. The control system automatically adjusts the speed of the multi-tube cooler feed screw mechanism 51 according to the manganese monoxide level, controls the amount of manganese monoxide delivered to the multi-tube cooler cooling cavity, and the manganese monoxide in the multi-tube cooler rolls forward in the multi-tube cooler composed of the multi-tube cooler shell 55 and the multi-tube cooler cooling pipe 56, and continues to cool to about 60°C, and is discharged from the multi-tube cooler discharge pipe 60 to the bin. The cold air becomes hot air through the multi-tube cooler cooling pipe 56 and the pipe internal screw 57, and the hot air is sent to the dryer through the induced draft fan 53 to dry the manganese powder and carbon powder mixture, completing the full heat recovery of the high-temperature and low-temperature parts of the manganese monoxide, and achieving energy saving and consumption reduction. The reaction process of reducing manganese dioxide to manganese monoxide is completed with low energy consumption.

[0056] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0057] Although the present application is described herein with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present application. It should therefore be understood that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It should be understood that the different dependent claims and features described herein can be combined with different dependent claims and features described herein in ways other than those described. It should also be understood that features described in connection with a single embodiment can be used in other described embodiments.

Claims

1. A solid phase heat energy recovery and energy saving device, characterized in that: The solid-phase heat energy recovery and energy-saving device includes a rotary kiln, which includes a rotary kiln drive mechanism and a rotary kiln inner cylinder and a rotary kiln outer cylinder fixed to each other, wherein the rotary kiln outer cylinder is sleeved on the outer side of the rotary kiln inner cylinder, and the rotary kiln drive mechanism is used to drive the rotary kiln inner cylinder and the rotary kiln outer cylinder to rotate, a feeding mechanism is installed at the first end of the rotary kiln inner cylinder, and a material transfer mechanism is installed at the second end of the rotary kiln inner cylinder; The material transfer mechanism can feed raw materials into the first end of the rotary kiln inner tube, and a rotary kiln inner tube spiral blade is installed in the rotary kiln inner tube. The rotation of the rotary kiln inner tube can enable the rotary kiln inner tube spiral blade to transport the raw materials to the second end of the rotary kiln inner tube and drop them to the first end of the rotary kiln outer tube. The first end of the rotary kiln outer tube is equipped with an electric heating mechanism, and the electric heating mechanism can heat the raw materials dropped to the first end of the rotary kiln outer tube to make the raw materials react. A rotary kiln outer tube spiral blade is provided between the inner wall of the rotary kiln outer tube and the outer wall of the rotary kiln inner tube. The rotation of the rotary kiln outer tube can enable the rotary kiln outer tube spiral blade to transport the reacted materials to the second end of the rotary kiln outer tube and discharge them through the discharging mechanism.

2. The solid-phase heat energy recovery and energy-saving device according to claim 1, characterized in that: The spiral blades of the inner drum of the rotary kiln are fixed to the inner side wall of the inner drum of the rotary kiln, the outer side of the spiral blades of the outer drum of the rotary kiln is fixed to the inner side wall of the outer drum of the rotary kiln, and the inner and outer spiral blades have opposite spiral directions.

3. The solid-phase heat energy recovery and energy-saving device according to claim 1, characterized in that: The discharging mechanism includes a rotary kiln outer cylinder rotary sealing sleeve and a rotary kiln discharging hopper. The rotary kiln outer cylinder rotary sealing sleeve is installed on the rotary kiln outer cylinder, and the rotary kiln outer cylinder can rotate relative to the rotary kiln outer cylinder rotary sealing sleeve. The rotary kiln discharging hopper is installed on the lower side of the rotary kiln outer cylinder rotary sealing sleeve. The rotation of the rotary kiln outer cylinder can enable the rotary kiln outer cylinder spiral blades to transport the reacted materials to the rotary kiln outer cylinder rotary sealing sleeve and discharge the materials through the rotary kiln discharging hopper.

4. The solid-phase heat energy recovery and energy-saving device according to claim 1, characterized in that: The feeding mechanism includes a rotary kiln feeding pipe and a rotary kiln inner cylinder rotary sealing end cover. The rotary kiln inner cylinder rotary sealing end cover sealing cover is provided at the first end of the rotary kiln inner cylinder, and the rotary kiln inner cylinder can rotate relative to the rotary kiln inner cylinder rotary sealing end cover. The rotary kiln feeding pipe is connected to the rotary kiln inner cylinder rotary sealing end cover, and the raw materials of the rotary kiln feeding pipe can enter the rotary kiln inner cylinder through the rotary kiln inner cylinder rotary sealing end cover.

5. The solid-phase heat energy recovery and energy-saving device according to claim 4, characterized in that: The rotary sealing end cover of the inner drum of the rotary kiln is also connected to an exhaust pipe, and the tail gas in the inner drum of the rotary kiln can be discharged through the exhaust pipe.

6. The solid-phase heat energy recovery and energy-saving device according to claim 4, characterized in that: The inner side wall of the rotary kiln inner cylinder and the inner side wall of the rotary kiln outer cylinder are both provided with a plurality of scrapers at intervals along the circumferential direction. The scrapers extend along the axial direction of the rotary kiln inner cylinder and the outer cylinder. The rotation of the rotary kiln inner cylinder and the rotary kiln outer cylinder can enable the scrapers to turn over the incoming raw materials.

7. The solid-phase heat energy recovery and energy-saving device according to claim 1, characterized in that: The solid-phase heat energy recovery and energy-saving device also includes a waste heat dryer, which includes a drying drum and a dryer driving mechanism. The dryer driving mechanism is used to drive the drying drum to rotate. The first end cover of the drying drum is provided with a front sealing end cover of the dryer, and the second end cover of the drying drum is provided with a rear sealing end cover of the dryer. The drying drum can rotate relative to the front sealing end cover of the dryer and the rear sealing end cover of the dryer. A metering feeding mechanism is provided on the front sealing end cover of the dryer, and a dryer discharge pipe is provided on the rear sealing end cover of the dryer. The dryer discharge pipe is used to feed the rotary kiln feeding mechanism.

8. The solid-phase heat energy recovery and energy-saving device according to claim 7, characterized in that: The heat source of the waste heat dryer includes the waste heat of the smoke from the rotary kiln and the hot air generated by the low-temperature waste heat of the material recovered by the multi-tube cooler, so that all the waste heat can be fully utilized, the humidity of the material when entering the rotary kiln is reduced, and the temperature of the material when entering the rotary kiln is increased.

9. The solid-phase heat energy recovery and energy-saving device according to claim 1, characterized in that: The solid-phase heat energy recovery and energy-saving device also includes a low-temperature waste heat recovery multi-tube cooler, which includes a multi-tube cooler feeding screw mechanism, a multi-tube cooler shell, a multi-tube cooler cooling pipe, a multi-tube cooler driving mechanism, a multi-tube cooler rear rotary seal and a multi-tube cooler discharge pipe. The multi-tube cooler feeding screw mechanism can transport the material unloaded from the unloading mechanism to the multi-tube cooler shell, and unload the material from the multi-tube cooler discharge pipe. The multi-tube cooler cooling pipe is installed in the multi-tube cooler shell for cooling the material in the multi-tube cooler shell. The multi-tube cooler rear rotary seal is installed at the discharge end of the multi-tube cooler shell. The multi-tube cooler driving mechanism is used to drive the multi-tube cooler shell to rotate.

10. The solid-phase heat energy recovery and energy-saving device according to claim 9, characterized in that: The multi-tube cooler cooling tube is equipped with a cooling tube spiral sheet, and the feed end of the multi-tube cooler shell is equipped with a multi-tube cooler hot air outlet pipe, and the air flow flowing through the multi-tube cooler cooling tube can be discharged from the multi-tube cooler hot air outlet pipe.

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