Device for exporting and utilizing waste heat energy outside kiln body

Abstract

The device comprises a plurality of rotary calcining assemblies which are sequentially connected end to end, each rotary calcining assembly comprises a rotary kiln, an outer sleeve interlayer and an air exhaust assembly, the adjacent rotary kilns are communicated end to end to form a calcining area inside, the outer sleeve interlayers are arranged on the outer walls of the rotary kilns in a sleeving mode, and the air exhaust assemblies are arranged on the outer walls of the rotary kilns. Each jacket interlayer is provided with a material leading-in opening and a material leading-out opening, the air exhaust assembly comprises a plurality of air exhaust pumps and a heat storage box body, the air exhaust pumps correspond to the jacket interlayers one to one, the air inlet ends of the air exhaust pumps communicate with the jacket interlayers, and the air outlet ends of the air exhaust pumps communicate with the air inlet end of the heat storage box body; the air outlet end of the heat storage box body communicates with the outer sleeve interlayer and the rotary kiln, and hot air can be introduced into the outer sleeve interlayer and / or the rotary kiln. According to the utility model, waste heat can be utilized for many times, energy consumption can be further reduced, and carbon emission can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphogypsum processing, in particular to a device for extracting and utilizing waste heat energy outside a kiln body. Background Art

[0002] At present, the main direction of expanding the resource utilization rate of phosphogypsum is to produce gypsum building materials using phosphogypsum. The first step in producing gypsum building materials using phosphogypsum is to calcine and dehydrate the phosphogypsum to obtain gypsum powder.

[0003] Patent application CN116655269A provides a device for calcining and harmlessly treating phosphogypsum using high-temperature ceramsite, which comprises: a rotary kiln, a first feeding piece, a second feeding piece and a sorting assembly; the rotary kiln comprises a first rotary kiln barrel and a second rotary kiln barrel; the second rotary kiln barrel is sleeved on the outside of the first rotary kiln barrel; a first interlayer channel is formed between the first rotary kiln barrel and the second rotary kiln barrel, and the head end of the first interlayer channel is connected to the head end of the first rotary kiln barrel; the first feeding piece is connected to the head end of the first rotary kiln barrel to input high-temperature ceramsite into the first rotary kiln barrel; the second feeding piece is connected to the first rotary kiln barrel The interlayer channels are connected to input phosphogypsum into the first interlayer channel; the second rotary kiln drum is used to drive the phosphogypsum to be transported along the first interlayer channel to the head end of the first rotary kiln drum, and the first rotary kiln drum is used to drive the mixture composed of phosphogypsum and high-temperature ceramsite to move from the head end to the tail end of the first rotary kiln drum; the mixture in the first rotary kiln drum and the phosphogypsum in the first interlayer channel can be heat exchanged through the wall of the first rotary kiln drum to dehydrate the phosphogypsum; the sorting component is arranged at the tail end of the first rotary kiln drum to sort the mixture output by the first rotary kiln drum to obtain the phosphogypsum after calcination. In essence, the gypsum is preheated by using the waste heat of the rotary kiln body and then introduced into the rotary kiln for mixing and calcining with ceramsite.

[0004] However, the current technical solution has the following problems: the waste heat of the kiln body is introduced into the rotary kiln after preheating the gypsum, which results in a low utilization rate of the waste heat in the hot air. Utility Model Content

[0005] In view of this, it is necessary to provide a device for extracting and utilizing waste heat outside the kiln body, which can extract the waste heat and improve the utilization rate of the waste heat.

[0006] A device for extracting and utilizing waste heat outside a kiln body, comprising:

[0007] A plurality of sections of rotary calcining components connected end to end in sequence, the rotary calcining components comprising a rotary kiln and a jacket interlayer, the adjacent rotary kilns are connected end to end to form a calcining area inside, the jacket interlayer is sleeved on the outer wall of the rotary kiln, the jacket interlayer has a material inlet and a material outlet, the material outlet is used to outlet the material or is connected to the material inlet of the jacket interlayer located downstream to guide the material in the current jacket interlayer into the jacket interlayer located downstream, and

[0008] The air extraction component includes a plurality of air extraction pumps and a heat storage box. The plurality of air extraction pumps correspond to the outer jacket interlayer one by one and the air inlet end of the air extraction pump is connected to the outer jacket interlayer, the air outlet end of the air extraction pump is connected to the air inlet end of the heat storage box, and the air outlet end of the heat storage box is connected to the outer jacket interlayer and the rotary kiln, so that hot air can be passed into the outer jacket interlayer and / or the rotary kiln.

[0009] Optionally, the material transportation direction in the jacket interlayer is the same as the material transportation direction of the rotary kiln.

[0010] Optionally, the rotary kiln and the outer jacket interlayer are both equipped with a rotary drive mechanism to drive the rotary kiln and the outer jacket interlayer to rotate in the same direction at the same speed or at a differential speed.

[0011] Optionally, the inner wall of the rotary kiln and the inner wall of the jacket interlayer are both provided with spirally arranged pouring plates.

[0012] Optionally, one end of the rotary kiln forms a feeding end for introducing green ceramsite and fuel or fired high-temperature ceramsite; the other end forms a discharging end for delivering the high-temperature ceramsite to the downstream rotary kiln.

[0013] Optionally, the outer interlayer includes an inner interlayer and an outer interlayer, the inner interlayer is sleeved on the outer circumferential surface of the rotary kiln, and the outer interlayer is sleeved on the inner interlayer on the outer circumferential surface of the rotary kiln, the inner interlayer has an inner layer feed port for introducing gypsum into the inner layer, and an inner layer discharge port for exporting the inner layer gypsum, the outer interlayer has an outer layer feed port for introducing gypsum into the outer layer, and an outer layer discharge port for exporting the outer layer gypsum, a connecting port is opened between the inner interlayer and the outer interlayer, and the inner layer feed port, the inner layer discharge port, the outer layer discharge port, the outer layer feed port and the connecting port are all provided with openable and closable valves.

[0014] Optionally, a heat insulation layer is provided on the outer surface of the outer interlayer.

[0015] Optionally, exhaust valves are embedded in the inner interlayer and the outer interlayer, and the exhaust valves are used to discharge the gas generated during the high-temperature dehydration of phosphogypsum.

[0016] Optionally, the air inlet end of the air pump is connected to the exhaust valve, and the air outlet end of the air pump is connected to the heat storage box. The air pump is used to extract the preheated gas that has not been fully utilized and remains in the interlayer of the outer jacket and send it into the heat storage box for storage.

[0017] Optionally, one end of the pouring plate is fixed to the inner wall of the rotary kiln or the inner wall of the jacket interlayer, and the other end of the pouring plate is bent to form a hook-shaped portion.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a device for extracting and utilizing waste heat outside a kiln body, comprising a plurality of rotary calcining components and an exhaust component which are sequentially connected end to end. The exhaust component can extract hot air that is not fully utilized in an outer jacket interlayer in the rotary calcining component and reuse it in the rotary kiln and the outer jacket interlayer, thereby realizing effective utilization of heat energy, further reducing energy consumption and reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of a module of a device for extracting and utilizing waste heat outside a kiln body according to the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of the central rotary calcining assembly in a working state;

[0023] Figure 3 for Figure 1 A schematic structural diagram of the central rotary calcining assembly in another working state;

[0024] Figure 4 It is a partial enlarged schematic diagram of the rotary calcining component;

[0025] Figure 5 It is a partial enlarged schematic diagram of a rotary calcining assembly in another embodiment;

[0026] Figure 6 It is a cross-sectional schematic diagram of the rotary kiln and the jacket interlayer;

[0027] Figure 7 for Figure 4 Schematic diagram of the structure of the middle pouring plate;

[0028] Wherein: 1-rotary calcining assembly, 11-rotary kiln, 101-pouring plate, 12-jacket interlayer, 121-inner interlayer, 121a-interlayer feed port, 121b-inner layer discharge port, 122-outer interlayer, 122a-outer layer feed port, 2-jacket exhaust device, 21-exhaust pump, 22-heat storage box. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0030] like Figure 1-7 As shown, an embodiment of the utility model provides a device for extracting and utilizing waste heat outside a kiln body, comprising a plurality of rotary calcining components 1 and an exhaust component 2 connected end to end in sequence, wherein the rotary calcining component 1 comprises a rotary kiln 11 and an outer jacket interlayer 12, and adjacent rotary kilns 11 are connected end to end to form a calcining area inside, and the outer jacket interlayer 12 is sleeved on the outer wall of the rotary kiln 11, and the outer jacket interlayer 12 has a material inlet and a material outlet, and the material outlet is used to extract materials or is connected to the material inlet of the outer jacket interlayer 12 located downstream, The material in the current outer jacket interlayer 12 is guided to the outer jacket interlayer 12 located downstream, and the exhaust assembly 2 includes a plurality of exhaust pumps 21 and a heat storage box 22. The plurality of exhaust pumps 21 correspond to the outer jacket interlayer 12 one by one, and the air inlet end of the exhaust pump 21 is connected to the outer jacket interlayer 12, the air outlet end of the exhaust pump 21 is connected to the air inlet end of the heat storage box 22, and the air outlet end of the heat storage box 22 is connected to the outer jacket interlayer 12 and the rotary kiln 11, so that hot air can be passed into the outer jacket interlayer 12 and / or the rotary kiln 11.

[0031] The utility model provides a device for extracting and utilizing waste heat outside a kiln body, comprising a plurality of rotary calcining components 1 and an exhaust component which are sequentially connected end to end. The exhaust component can extract hot air that is not fully utilized in an outer jacket interlayer in the rotary calcining component 1 and reuse it in the rotary kiln and the outer jacket interlayer, thereby realizing effective utilization of heat energy, further reducing energy consumption and carbon emissions.

[0032] Since the calcination area has the characteristic of gradually increasing temperature, the low-temperature part of the rotary kiln 11 can heat and dry the phosphogypsum, and the high-temperature part of the rotary kiln 11 can calcine and crystallize the phosphogypsum, thereby producing gypsum powder.

[0033] Furthermore, one end of the rotary kiln 11 forms a feeding end for introducing green ceramsite and fuel or fired high-temperature ceramsite; the other end forms a discharging end for sending the high-temperature ceramsite into the downstream rotary kiln 11.

[0034] Furthermore, the direction from the material inlet to the material outlet of the outer jacket interlayer 12 is the same as the direction from the feed end to the discharge end of the rotary kiln 11. The advantage of this arrangement is that the distance between the material outlet and the material inlet of the downstream outer jacket interlayer 12 is relatively close, which facilitates the introduction of gypsum powder into the downstream outer jacket interlayer 12.

[0035] In some embodiments, the rotary kiln 11 and the outer jacket interlayer 12 can be considered to be equipped with a rotation drive mechanism to achieve the rotary kiln 11 and the outer jacket interlayer 12 rotating in the same direction at the same speed or at a different speed. The inner wall of the rotary kiln 11 and the inner wall of the outer jacket interlayer 12 are both equipped with a material conveying structure.

[0036] As the rotary kiln 11 and the outer jacket interlayer 12 rotate, the phosphogypsum in the outer jacket interlayer 12 can be gradually transported to the downstream outer jacket interlayer 12 driven by the material conveying structure on the inner wall of the outer jacket interlayer 12 .

[0037] Specifically, the inner wall of the rotary kiln 11 and the inner wall of the outer jacket interlayer 12 are both provided with a spirally arranged pouring plate 101. The rotary kiln 11 and the outer jacket interlayer 12 can rotate at the same speed or at a different speed in the same direction of rotation. In this way, when the rotary kiln 11 rotates, the rotary kiln 11 can drive the pouring plate 101 on the inner wall of the rotary kiln 11 to rotate, thereby guiding the ceramsite to move in the rotary kiln 11 based on the promotion of the pouring plate 101.

[0038] Furthermore, a plurality of the pouring plates 101 are arranged along a spiral line on the inner wall of the rotary kiln 11 .

[0039] Furthermore, a plurality of the pouring plates 101 are arranged along a spiral line on the inner wall of the outer jacket interlayer 12 .

[0040] Furthermore, one end of the pouring plate 101 is fixed to the inner wall of the rotary kiln 11 and the inner wall of the jacket interlayer 12, and the other end of the pouring plate 101 is bent to form a hook-shaped portion. The purpose of this arrangement is that the pouring plate 101 can scoop up the material at the bottom and rotate it to the top for throwing, which can solve the problem of material getting stuck and blocked at the bottom, and can also enhance the heat exchange efficiency of the material.

[0041] Correspondingly, when the outer jacket interlayer 12 rotates, the outer jacket interlayer 12 can drive the pushing plate 101 on the inner wall of the outer jacket interlayer 12 to rotate, thereby guiding the phosphogypsum to move in the outer jacket interlayer 12 based on pushing the pushing plate 101 .

[0042] In practical applications, this embodiment can control the speed at which the rotary kiln 11 and the outer jacket interlayer 12 push the materials in their corresponding cavities by controlling the rotation speeds of the rotary kiln 11 and the outer jacket interlayer 12 .

[0043] Specifically, the outer jacket interlayer 12 includes an inner interlayer 121 and an outer interlayer 122, wherein the inner interlayer 121 is sleeved on the outer circumference of the rotary kiln 11, and the outer interlayer 122 is sleeved on the inner interlayer 121 on the outer circumference of the rotary kiln 11, wherein the inner interlayer 121 has an interlayer feed port 121a for introducing gypsum into the inner layer and an inner layer discharge port 121b for discharging the inner layer gypsum, and the outer interlayer 122 It has an outer layer feed port 122a for introducing gypsum into the outer layer, the interlayer feed port 121a is provided with a circumferential valve, which can cover or open the interlayer feed port 121a, the inner layer discharge port 121b is provided with an annular discharge valve, which can cover or open the inner layer discharge port 121b, and the outer layer feed port 122a is provided with a feed valve that can be opened and closed horizontally, which can cover or open the outer layer feed port 122a.

[0044] In actual use, different paths of phosphogypsum can be achieved by adjusting the opening and closing of the interlayer feed port 121a, the inner layer discharge port 121b, and the outer layer feed port 122a.

[0045] For example, Figure 2 As shown, the circular valve is closed to close the interlayer feed port 121a, and the annular discharge valve and the feed valve are opened to open the outer layer feed port 122a and the inner layer discharge port 121b; the phosphogypsum first enters the outer interlayer 122, absorbs heat in the outer interlayer 122, and then enters the inner interlayer 121 to absorb heat again, thereby realizing a single-cycle heat absorption mode.

[0046] like Figure 3 As shown, the circular valve is opened to open the interlayer feed port 121a, and the annular discharge valve and the feed valve are closed to close the outer layer feed port 122a and the inner layer discharge port 121b; the phosphogypsum repeatedly flows between the outer interlayer 122 and the inner interlayer 121 to achieve a repeated heat absorption mode.

[0047] In some embodiments, the outer jacket interlayer 12 includes an inner interlayer, a middle interlayer and an outer interlayer, the inner interlayer is sleeved on the outer circumferential surface of the rotary kiln 11, the middle interlayer is sleeved on the outer circumferential surface of the inner interlayer, and the outer interlayer is sleeved on the outer circumferential surface of the middle interlayer, the inner interlayer has a first interlayer feed port connected to the middle interlayer and an inner layer discharge port for discharging the inner layer gypsum, the middle interlayer has a second interlayer feed port connected to the outer interlayer, the outer interlayer has an outer layer feed port for introducing gypsum into the outer layer, the inner layer discharge port is provided with an annular discharge valve, which can cover or open the inner layer discharge port, and the outer layer feed port is provided with a feed valve that can be opened and closed horizontally, which can cover or open the outer layer feed port. In actual use, the annular discharge valve and the feed valve are opened, so that the outer layer feed port and the inner layer discharge port are opened; the phosphogypsum first enters the outer layer interlayer, absorbs heat in the outer layer interlayer, then enters the middle layer interlayer to absorb heat, then enters the inner layer interlayer to absorb heat, and finally is discharged from the inner layer discharge port, realizing a single-cycle heat absorption mode.

[0048] Furthermore, the pouring plate 101 is fixed on the outer wall of the inner interlayer 121 , and can guide the material entering from the outer layer feed port to move into the outer interlayer 122 .

[0049] Furthermore, exhaust valves are embedded in the inner interlayer 121 and the outer interlayer 122, and the exhaust valves are used to discharge the gas generated during the high-temperature dehydration of phosphogypsum.

[0050] Furthermore, a filter is provided at the exhaust valve, and the filter is used to filter the gas. The filter is filled with silicon dioxide, which is resistant to high temperatures and has a porous surface, and can effectively adsorb dust.

[0051] Furthermore, a heat insulating layer is provided on the outer surface of the outer interlayer 122 to prevent heat dissipation.

[0052] Furthermore, the air inlet end of the air pump 21 is connected to the exhaust valve, and the air outlet end of the air pump 21 is connected to the heat storage box 22. The air pump 21 is used to extract the gas that has not been fully utilized and has residual heat in the outer jacket interlayer 12 and send it into the heat storage box 22 for storage.

[0053] The gas outlet of the heat storage box 22 is connected to the rotary kiln 11. The heat storage box 22 can deliver the gas generated by the high-temperature dehydration of phosphogypsum extracted by the air pump 21 into the rotary kiln 11. On the one hand, the high-temperature ceramsite in the rotary kiln 11 passivates the harmful gas generated by the high-temperature dehydration of phosphogypsum, so that the gas meets the emission standards. On the other hand, the porous adsorption of the high-temperature ceramsite can adsorb gypsum dust in the gas, which can reduce dust.

[0054] In some embodiments, the air outlet end of the heat storage box 22 is connected to all the rotary kilns 11, and the stored hot air can be introduced into any rotary kiln 11. For example, the air pump 21 extracts the hot air in the jacket of the rotary calcining assembly 1 located upstream, and sends it into the rotary kiln 11 located in the middle and downstream through the heat storage box 22, so that the entire kiln body waste heat energy extraction and utilization device forms a "low temperature to high temperature" staged calcination system from upstream to downstream, so that the rotary kilns 11 in the upstream, middle and downstream can calcine to produce different gypsums as needed.

[0055] The air outlet of the heat storage box 22 is connected to the outer jacket interlayer 12. The heat storage box 22 can send hot air into the outer jacket interlayer 12. The temperature of the outer jacket interlayer 12 can be increased to achieve effective utilization of thermal energy, which can further reduce energy consumption and carbon emissions.

[0056] A heat insulation layer is provided on the outer surface of the heat storage box 22 , which can effectively prevent the heat loss of the hot air in the heat storage box 22 .

[0057] The beneficial effects of the utility model are:

[0058] The utility model provides a device for extracting and utilizing waste heat outside a kiln body, comprising a plurality of rotary calcining components 1 and an exhaust component which are sequentially connected end to end. The exhaust component can extract hot air that is not fully utilized in an outer jacket interlayer in the rotary calcining component 1 and reuse it in the rotary kiln and the outer jacket interlayer, thereby realizing effective utilization of heat energy, further reducing energy consumption and carbon emissions.

[0059] The above are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for extracting and utilizing waste heat outside a kiln body, characterized in that: include: A plurality of sections of rotary calcining components connected end to end in sequence, the rotary calcining components comprising a rotary kiln and a jacket interlayer, the adjacent rotary kilns are connected end to end to form a calcining area inside, the jacket interlayer is sleeved on the outer wall of the rotary kiln, the jacket interlayer has a material inlet and a material outlet, the material outlet is used to outlet the material or is connected to the material inlet of the jacket interlayer located downstream to guide the material in the current jacket interlayer into the jacket interlayer located downstream, and The air extraction component includes a plurality of air extraction pumps and a heat storage box. The plurality of air extraction pumps correspond to the outer jacket interlayer one by one and the air inlet end of the air extraction pump is connected to the outer jacket interlayer, the air outlet end of the air extraction pump is connected to the air inlet end of the heat storage box, and the air outlet end of the heat storage box is connected to the outer jacket interlayer and the rotary kiln, so that hot air can be passed into the outer jacket interlayer and / or the rotary kiln.

2. The device for extracting and utilizing waste heat outside the kiln body according to claim 1, characterized in that: The material transportation direction in the jacket interlayer is the same as the material transportation direction of the rotary kiln.

3. The device for extracting and utilizing waste heat outside the kiln body according to claim 2, characterized in that: The rotary kiln and the jacket interlayer are both equipped with a rotary drive mechanism to drive the rotary kiln and the jacket interlayer to rotate in the same direction at the same speed or at a different speed.

4. The device for extracting and utilizing waste heat outside the kiln body according to claim 3, characterized in that: The inner wall of the rotary kiln and the inner wall of the jacket interlayer are both provided with pouring plates arranged in a spiral shape.

5. The device for extracting and utilizing waste heat outside the kiln body according to claim 4, characterized in that: One end of the rotary kiln forms a feeding end for introducing green ceramsite and fuel or fired high-temperature ceramsite; the other end forms a discharging end for sending the high-temperature ceramsite into the downstream rotary kiln.

6. The device for extracting and utilizing waste heat outside the kiln body according to claim 1, characterized in that: The outer interlayer comprises an inner interlayer and an outer interlayer, the inner interlayer is sleeved on the outer circumferential surface of the rotary kiln, the outer interlayer is sleeved on the inner interlayer on the outer circumferential surface of the rotary kiln, the inner interlayer has an inner layer feed port for introducing gypsum into the inner layer and an inner layer discharge port for exporting the inner layer gypsum, the outer interlayer has an outer layer feed port for introducing gypsum into the outer layer and an outer layer discharge port for exporting the outer layer gypsum, a connecting port is provided between the inner interlayer and the outer interlayer, and the inner layer feed port, the inner layer discharge port, the outer layer discharge port, the outer layer feed port and the connecting port are all provided with openable and closable valves.

7. The device for extracting and utilizing waste heat outside the kiln body according to claim 6, characterized in that: A heat insulation layer is arranged on the outer surface of the outer interlayer.

8. The device for extracting and utilizing waste heat outside the kiln body according to claim 6, characterized in that: Exhaust valves are embedded in the inner interlayer and the outer interlayer, and the exhaust valves are used to discharge the gas generated during the high-temperature dehydration of phosphogypsum.

9. The device for extracting and utilizing waste heat outside the kiln body according to claim 8, characterized in that: The air inlet end of the air pump is connected to the exhaust valve, and the air outlet end of the air pump is connected to the heat storage box. The air pump is used to extract the preheated gas that has not been fully utilized and remains in the jacket interlayer and send it into the heat storage box for storage.

10. The device for extracting and utilizing waste heat outside the kiln body according to claim 4, characterized in that: One end of the pouring plate is fixed to the inner wall of the rotary kiln or the inner wall of the jacket interlayer, and the other end of the pouring plate is bent to form a hook-shaped portion.

Images