Stepped device for calcining cement clinker based on electric energy

Abstract

The invention relates to the technical field of cement production, and provides a stepped device for calcining cement clinker based on electric energy, the stepped device comprises a shell, a multi-stage stepped structure, a plurality of electric heating elements and a plurality of vibration rods, the shell is provided with an inner cavity, and a feed port and a discharge port which are communicated with the inner cavity; the multi-step structure is arranged in the inner cavity, the multi-step structure comprises a plurality of steps which are arranged at intervals, and projection parts of every two adjacent steps in the gravity direction are overlapped; each electric heating element is correspondingly arranged on one step, the electric heating elements are electrically connected with an external power supply so as to heat materials at the steps, and the materials at different steps can be calcined at different temperatures. Each vibration rod is correspondingly connected to one step and electrically connected with an external power source so as to drive the steps to incline and vibrate. The inclination angle of the step can be adjusted through the vibration rod, so that the material moves step by step to control the reaction time of the material; the stirring of the materials on the steps can be promoted, so that the heating uniformity of the materials is improved, the material balls are fully reacted, and the adhesion is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cement production, in particular to a stepped device for calcining cement clinker based on electric energy. Background Art

[0002] When step furnaces are used in the cement industry, the heating method mainly uses heat from the tertiary air ducts, which is used for preheating and pre-combustion of materials such as sludge, domestic waste, and hazardous solid waste, so as to reduce the impact of the coordinated disposal of such materials on the kiln conditions and clinker quality of the cement kiln. A pusher or air cannon is generally installed in the furnace to avoid material adhesion and ensure the combustion effect of the materials. The muffle furnace is mainly used for electric calcination of cement clinker in the laboratory.

[0003] In the related technologies, the step furnace is mainly suitable for the disposal of sludge, domestic garbage, hazardous solid waste and other materials, and cannot be used for the burning of cement clinker, so its application scope is limited. The temperature field in the furnace is relatively uniform, which is not conducive to graded temperature control. In addition, the laboratory muffle furnace for burning cement clinker belongs to static sintering, which cannot achieve continuous production, the material residence time is long, the heating is not uniform, and the liquid phase is easy to stick together. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a step device for calcining cement clinker based on electric energy, which aims to calcine the material in a graded temperature-controlled manner and improve the calcination uniformity of the cement clinker.

[0005] The step device based on electric energy for calcining cement clinker according to an embodiment of the present invention comprises: A shell body, wherein the shell body is provided with an inner cavity and a feed port and a discharge port communicating with the inner cavity; A multi-step ladder structure, the multi-step ladder structure is arranged in the inner cavity, the multi-step ladder structure comprises a plurality of steps spaced apart from each other, and the projections of two adjacent steps in the direction of gravity partially overlap; A plurality of electric heating elements, each of which is disposed correspondingly on one of the steps, and the electric heating element is electrically connected to an external power source to heat the material on the step; A plurality of vibration rods, each of which is connected to a corresponding step, and the vibration rod is electrically connected to an external power source to drive the step to vibrate.

[0006] According to the step device for calcining cement clinker based on electric energy according to the embodiment of the present invention, the material is transported into the inner cavity through the feed port of the shell, and the material is transported step by step in the multi-level steps. After calcination, the cement clinker falls to the discharge port. Each step is correspondingly provided with an electric heating element, and each electric heating element can be individually temperature-controlled so that the materials at different steps can be calcined at different temperatures to achieve different temperature requirements for different work sections. Calcination by electric heating is more energy-saving and environmentally friendly. At the same time, each step is correspondingly provided with a vibration rod, and the vibration rod drives the step to vibrate, which can be regularly vibrated to increase the turning of the material, improve the uniformity of heating of the material, make the material balls react fully and reduce adhesion.

[0007] According to an embodiment of the present invention, the vibration rod can be raised and lowered to adjust the inclination angle of the step in the horizontal direction.

[0008] According to an embodiment of the present invention, the inclination angle of the step in the horizontal direction is 0-30°.

[0009] According to an embodiment of the present invention, in two adjacent steps, the upper step is arranged to have an arc transition at one end adjacent to the next step.

[0010] According to one embodiment of the present invention, the multi-step ladder structure includes five steps and a cooling step, wherein the cooling step is arranged at the end of the five steps, and the cooling step is not subjected to a heating treatment.

[0011] According to one embodiment of the present invention, the five-step ladder includes: A first step, the first step is arranged in the inner cavity, and the first step is arranged adjacent to the feed port; a second step, the second step being arranged in the inner cavity and located below the first step, wherein the projection of the second step in the gravity direction partially overlaps with the projection of the first step; a third step, the third step being arranged in the inner cavity and located below the second step, and the projection of the third step and the second step in the gravity direction partially overlap; a fourth step, the fourth step being arranged in the inner cavity and located below the third step, wherein the projection of the fourth step and the third step in the direction of gravity partially overlap; A fifth step is provided in the inner cavity and is located below the fourth step. The projections of the fifth step and the fourth step in the gravity direction partially overlap.

[0012] According to one embodiment of the present invention, the surface temperature of the first step is 550°C-650°C; The surface temperature of the second step is 750°C-850°C; The surface temperature of the third step is 950°C-1050°C; The surface temperature of the fourth step is 1250°C-1350°C; The surface temperature of the fifth step is 1450°C-1550°C.

[0013] According to one embodiment of the present invention, the inner cavity includes a material cavity and an installation cavity, the multi-step stepped structure divides the inner cavity into the material cavity and the installation cavity, the feed port and the discharge port are connected to the material cavity, and the multiple vibration rods are installed in the installation cavity.

[0014] According to one embodiment of the present invention, a first weight-sensing flap valve and a second weight-sensing flap valve are sequentially provided at the feed port along the feed direction, the first weight-sensing flap valve and the second weight-sensing flap valve are both rotatably connected to the shell, and the first weight-sensing flap valve and the second weight-sensing flap valve flip over to open or close the feed port under material pressure.

[0015] And / or, a third weight-sensing flap valve and a fourth weight-sensing flap valve are sequentially provided at the discharge port along the discharge direction, and the third weight-sensing flap valve and the fourth weight-sensing flap valve are both rotatably connected to the shell, and the third weight-sensing flap valve and the fourth weight-sensing flap valve flip over to open the feed port or close the discharge port under material pressure.

[0016] According to one embodiment of the present invention, a screw feeder is provided at the feed inlet; And / or, the shell is connected to a gas passage communicating with the inner cavity.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are 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 paying creative work.

[0019] Figure 1 It is a schematic structural diagram of a stepped device for calcining cement clinker based on electric energy provided in an embodiment of the present invention.

[0020] Reference numerals: 1. Shell; 11. Inner cavity; 111. Material cavity; 112. Installation cavity; 12. Feed port; 13. Discharge port; 14. First step; 15. Second step; 16. Third step; 17. Fourth step; 18. Fifth step; 19. Cooling step; 20. Vibration rod; 21. First weight-sensing flap valve; 22. Second weight-sensing flap valve; 23. Third weight-sensing flap valve; 24. Fourth weight-sensing flap valve; 25. Screw feeder; 26. Gas channel. DETAILED DESCRIPTION

[0021] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0023] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0025] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0026] The heating method of the step furnace used in the cement industry mainly uses the heat from the tertiary air duct, which can be used for preheating and pre-combustion of materials such as sludge, domestic garbage, and hazardous solid waste to reduce the impact of the coordinated disposal of such materials on the kiln condition and clinker quality of the cement kiln. A pusher device or air cannon is generally provided in the step furnace to avoid material sticking and ensure the material combustion effect. Existing step furnaces have the following disadvantages: It is mainly suitable for the disposal of sludge, domestic waste, hazardous solid waste and other materials. It cannot be used in the burning of cement clinker and its scope of use is limited.

[0027] Combustion through tertiary air ducts is essentially the heat generated by fossil energy, which does not meet the current urgent need for carbon emission reduction.

[0028] The temperature field in the furnace is relatively uniform, which is not conducive to graded temperature control.

[0029] Air cannons use compressed air, which has a long process flow, high energy consumption and is prone to loss.

[0030] In addition, the calcination of cement clinker in an electric muffle furnace is a static sintering process, the material residence time is long, the heating is not uniform, and the liquid phase is easy to stick together.

[0031] In view of the above problems, the following introduces the step device for calcining cement clinker based on electric energy of the present application.

[0032] like Figure 1As shown, the step device for calcining cement clinker based on electric energy according to an embodiment of the present invention includes a shell 1, a multi-step step structure, a plurality of electric heating elements and a plurality of vibration rods 20. The shell 1 is provided with an inner cavity 11 and a feed port 12 and a discharge port 13 connected to the inner cavity 11; the multi-step step structure is arranged in the inner cavity 11, and the multi-step step structure includes a plurality of mutually spaced steps, and the size of the interval is just enough for the space required for the step to tilt and vibrate, so that each step does not affect each other during movement, and the projections of two adjacent steps in the direction of gravity overlap; each electric heating element is correspondingly arranged on a step, and the electric heating element is electrically connected to an external power supply to heat the material at the step; each vibration rod 20 is correspondingly connected to a step, and the vibration rod 20 is electrically connected to an external power supply to drive the step to vibrate.

[0033] It is understandable that the multiple steps are spaced apart from each other so that the multiple steps can vibrate independently without interfering with each other to avoid wear. At the same time, the material can be sequentially conveyed along the multiple steps toward the discharge port 13. The vibration of the vibration rod 20 can realize the vibration flipping of the material, and the material can be sequentially conveyed along the multiple steps under the action of gravity. It should be noted that the material input from the feed port 12 is cement raw material, which is calcined in the inner cavity 11 to achieve the decomposition of the cement raw material and the burning of cement clinker.

[0034] According to the step device for calcining cement clinker based on electric energy according to the embodiment of the present invention, the material is transported to the inner cavity 11 through the feed port 12 of the shell 1, and the material is transported step by step in the multi-level steps. After calcination, the cement clinker falls to the discharge port 13. Each step is correspondingly provided with an electric heating element, and each electric heating element can be individually temperature-controlled, so that the materials at different steps can be calcined at different temperatures to achieve different temperature requirements for different work sections. Calcination by electric heating is more energy-saving and environmentally friendly. At the same time, each step is correspondingly provided with a vibration rod 20, and the vibration of the step is driven by the vibration rod 20. Regular vibration can increase the turning of the material, improve the uniformity of heating of the material, make the material balls react fully and reduce adhesion.

[0035] In this embodiment, green electricity is used to supply cement material for calcination. The heat of the electric heating element and the vibration of the vibration rod 20 are all supplied by green electricity. Wind power, photovoltaic power, etc. can be used according to actual conditions. Compared with traditional fossil energy, it not only saves energy and reduces consumption, but also reduces carbon dioxide emissions. The electric heating element can be a resistance wire, an electric heating rod, an electric heating plate, etc., which is not limited here.

[0036] According to one embodiment of the present invention, the vibration rod 20 can be raised and lowered to adjust the inclination angle of the ladder in the horizontal direction. It can be understood that each vibration rod 20 is supported at the bottom of a ladder, such as Figure 1As shown, illustratively, the upper left corner of the shell 1 is the feed port 12, and the lower right corner of the shell 1 is the discharge port 13, then multiple steps are successively reduced in height from left to right to form a stepped structure. Specifically, the vibration rod 20 is supported on one side of the bottom of the step, not on the center of the step, and the other side of the step can be rotatably supported on the inner wall of the shell 1. When the vibration rod 20 is extended and retracted to drive one side of the step to rise and fall, the inclination angle of the step in the horizontal direction will change, so that the residence time of the material on the step under the action of gravity can be adjusted to avoid the calcination time of the material on the step being too long or too short. Each vibration rod 20 can be raised and lowered, so that the inclination angle of each step can be adjusted, which is beneficial to control the residence time of the material during calcination at each stage, and the calcination effect is better. Exemplarily, each vibration rod 20 is connected to the left side of the bottom of the corresponding step. It should be noted that the left and right here only refers to Figure 1 The directions in the figure are used to describe the actual connection position of the vibration rod 20, and the actual connection position of the vibration rod 20 can be adjusted according to different viewing angles.

[0037] According to one embodiment of the present invention, the inclination angle of the step in the horizontal direction is 0-30°. It is understandable that the vibration rod 20 is raised and lowered within a certain height range to control the inclination angle of the step within 30°. It should be noted that the inclination angle here is the angle when the step is tilted downward, that is, the step is tilted towards the direction of gravity in the material conveying direction, so that the material is conveyed under the action of gravity. For example Figure 1 In the embodiment, the steps are arranged to be tilted downward from left to right. The tilt angles of different steps can be achieved by different lifting heights of different vibration rods 20.

[0038] According to one embodiment of the present invention, in two adjacent steps, the upper step is adjacent to one end of the next step in an arc transition arrangement. Figure 1 The right side of each step is an arc structure to prevent materials from piling up here.

[0039] According to one embodiment of the present invention, the multi-step ladder structure includes five steps and a cooling step 19, which is arranged at the end of the five steps and is not subjected to heating treatment. That is, the cooling step 19 is the sixth step, and no electric heating element may be installed here, or the electric heating element may not be subjected to heating treatment, so that the material after calcination is cooled here.

[0040] According to one embodiment of the present invention, the five-step stairs include a first step 14, a second step 15, a third step 16, a fourth step 17 and a fifth step 18. The first step 14 is arranged in the inner cavity 11, and the first step 14 is arranged adjacent to the feed port 12; the second step 15 is arranged in the inner cavity 11, and is located below the first step 14, and the second step 15 and the first step 14 partially overlap in the projection direction of gravity; the third step 16 is arranged in the inner cavity 11, and is located below the second step 15, and the third step 16 and the second step 15 partially overlap in the projection direction of gravity; the fourth step 17 is arranged in the inner cavity 11, and is located below the third step 16, and the fourth step 17 and the third step 16 partially overlap in the projection direction of gravity; the fifth step 18 is arranged in the inner cavity 11, and is located below the fourth step 17, and the fifth step 18 and the fourth step 17 partially overlap in the projection direction of gravity.

[0041] It should be noted that the projection in the direction of gravity refers to the projection of the two onto the same horizontal plane along the direction of gravity, and the projections of the two overlap on this horizontal plane, so that the two adjacent steps can smoothly transfer materials.

[0042] According to one embodiment of the present invention, the surface temperature of the first step 14 is 550° C.-650° C., and the first step 14 is used for preheating the material.

[0043] The surface temperature of the second step 15 is 750° C.-850° C., and the second step 15 is used for heating and decomposing materials.

[0044] The surface temperature of the third step 16 is 950° C.-1050° C., and the third step 16 is used for solid phase reaction.

[0045] The surface temperature of the fourth step 17 is 1250° C.-1350° C., and the fourth step 17 is used for liquid phase generation.

[0046] The surface temperature of the fifth step 18 is 1450° C.-1550° C., and the fifth step 18 is used for the final sintering of the clinker.

[0047] According to one embodiment of the present invention, the inner cavity 11 includes a material cavity 111 and an installation cavity 112. The multi-step structure separates the inner cavity 11 into the material cavity 111 and the installation cavity 112. The feed port 12 and the discharge port 13 are connected to the material cavity 111. A plurality of vibration rods 20 are installed in the installation cavity 112. It can be understood that the inner cavity 11 is separated into the material cavity 111 and the installation cavity 112. The material cavity 111 is used for calcining the material, and the installation cavity 112 is used for installing the vibration rod 20 to prevent the vibration rod 20 from being deformed and damaged by excessive heat. At the same time, the wires connecting the vibration rod 20 and the electric heating element to the external power supply can also be arranged in the installation cavity 112. For example, the wires connecting the electric heating element to the external power supply can be fixed on the vibration rod 20 to prevent the wires from hanging and shaking.

[0048] According to one embodiment of the present invention, a screw feeder 25 is provided at the feed port 12 . For example, cement raw material balls with a diameter of 10-16 mm are fed into the device through the screw feeder 25 .

[0049] According to one embodiment of the present invention, a first weight-sensing flap valve 21 and a second weight-sensing flap valve 22 are sequentially provided at the feed port 12 along the feed direction. The first weight-sensing flap valve 21 and the second weight-sensing flap valve 22 are both rotatably connected to the housing 1. The first weight-sensing flap valve 21 and the second weight-sensing flap valve 22 flip to open the feed port 12 or close the feed port 12 under the pressure of the material. Specifically, a double-channel weight-sensing flap valve is provided at the feed port 12. When the weight of the material reaches the set weight, the first weight-sensing flap valve 21 flips down under the action of gravity, and the material falls onto the second weight-sensing flap valve 22. When all of them fall, the first weight-sensing flap valve 21 is closed, and the second weight-sensing flap valve 22 flips down, and the material enters the internal steps of the device. In this way, the internal heat loss of the device can be well prevented, and the reaction amount can also be accurately controlled.

[0050] In one embodiment, a third weight-sensing flap valve 23 and a fourth weight-sensing flap valve 24 are sequentially provided at the discharge port 13 along the discharge direction. The third weight-sensing flap valve 23 and the fourth weight-sensing flap valve 24 are both rotatably connected to the housing 1. The third weight-sensing flap valve 23 and the fourth weight-sensing flap valve 24 flip to open or close the discharge port 13 under the pressure of the material. Similarly, the calcined material falls onto the third weight-sensing flap valve 23. When the set weight is reached, the third weight-sensing flap valve 23 flips down under the action of gravity, and the material falls onto the fourth weight-sensing flap valve 24. When all of the material falls, the third weight-sensing flap valve 23 is closed, and the fourth weight-sensing flap valve 24 flips down to complete the material discharge. In this way, the discharge port 13 is automatically opened when the material is discharged, and the discharge port 13 is automatically closed when the material is discharged. There is no need to set a valve to control the opening and closing, and the structure is simple.

[0051] In one embodiment, the shell 1 is connected to a gas channel 26 connected to the inner cavity 11. The gas channel 26 is located at the top of the shell 1 and is used to discharge the carbon dioxide generated during the inner cavity 11. It can be understood that carbon dioxide and other gases are discharged in a centralized manner through the gas channel 26, which is convenient for collection at the outlet of the gas channel 26.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and should be included in the scope of the claims of the present invention.

Claims

1. A step device for calcining cement clinker based on electric energy, characterized in that: include: A shell body, wherein the shell body is provided with an inner cavity and a feed port and a discharge port communicating with the inner cavity; A multi-step ladder structure, the multi-step ladder structure is arranged in the inner cavity, the multi-step ladder structure comprises a plurality of steps spaced apart from each other, and the projections of two adjacent steps in the direction of gravity partially overlap; A plurality of electric heating elements, each of which is disposed correspondingly on one of the steps, and the electric heating element is electrically connected to an external power source to heat the material on the step; A plurality of vibration rods, each of which is connected to a corresponding step, and the vibration rod is electrically connected to an external power source to drive the step to vibrate.

2. The step device for calcining cement clinker based on electric energy according to claim 1 is characterized in that: The vibration rod can be raised and lowered to adjust the inclination angle of the step in the horizontal direction.

3. The step device for calcining cement clinker based on electric energy according to claim 2 is characterized in that: The inclination angle of the steps in the horizontal direction is 0-30°.

4. The step device for calcining cement clinker based on electric energy according to claim 1 is characterized in that: In two adjacent steps, the upper step is arranged to transition into an arc at one end adjacent to the next step.

5. The step device for calcining cement clinker based on electric energy according to claim 1 is characterized in that: The multi-step ladder structure includes five steps and a cooling step, wherein the cooling step is arranged at the end of the five steps and the cooling step is not subjected to a heating treatment.

6. The step device for calcining cement clinker based on electric energy according to claim 5 is characterized in that: The five-level ladder includes: A first step, the first step is arranged in the inner cavity, and the first step is arranged adjacent to the feed port; a second step, the second step being arranged in the inner cavity and located below the first step, wherein the projection of the second step in the gravity direction partially overlaps with the projection of the first step; a third step, the third step being arranged in the inner cavity and located below the second step, and the projection of the third step and the second step in the gravity direction partially overlap; a fourth step, the fourth step being arranged in the inner cavity and located below the third step, wherein the projection of the fourth step and the third step in the direction of gravity partially overlap; A fifth step is provided in the inner cavity and is located below the fourth step. The projections of the fifth step and the fourth step in the gravity direction partially overlap.

7. The step device for calcining cement clinker based on electric energy according to claim 6 is characterized in that: The surface temperature of the first step is 550°C-650°C; The surface temperature of the second step is 750°C-850°C; The surface temperature of the third step is 950°C-1050°C; The surface temperature of the fourth step is 1250°C-1350°C; The surface temperature of the fifth step is 1450°C-1550°C.

8. The step device for calcining cement clinker based on electric energy according to claim 1, characterized in that: The inner cavity comprises a material cavity and an installation cavity, the multi-step stepped structure separates the inner cavity into the material cavity and the installation cavity, the feed port and the discharge port are connected to the material cavity, and the plurality of vibration rods are installed in the installation cavity.

9. The step device for calcining cement clinker based on electric energy according to any one of claims 1 to 8, characterized in that: A first weight-sensing flap valve and a second weight-sensing flap valve are sequentially provided at the feed port along the feed direction. The first weight-sensing flap valve and the second weight-sensing flap valve are both rotatably connected to the shell. The first weight-sensing flap valve and the second weight-sensing flap valve flip over to open or close the feed port under material pressure. And / or, a third weight-sensing flap valve and a fourth weight-sensing flap valve are sequentially provided at the discharge port along the discharge direction, and the third weight-sensing flap valve and the fourth weight-sensing flap valve are both rotatably connected to the shell, and the third weight-sensing flap valve and the fourth weight-sensing flap valve flip over to open the feed port or close the discharge port under material pressure.

10. The step device for calcining cement clinker based on electric energy according to any one of claims 1 to 8, characterized in that: A screw feeder is provided at the feed inlet; And / or, the shell is connected to a gas passage communicating with the inner cavity.

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