High-temperature kiln waste heat structure for cristobalite transformation

Abstract

The utility model discloses a high-temperature kiln waste heat structure for cristobalite transformation, which is characterized in that the periphery of an electric heating high-temperature kiln is provided with an outer thermal insulation layer, the inner cavity of the electric heating high-temperature kiln is sequentially divided into a preheating area, a firing area and a forced cooling area, the two sides of the firing area are respectively provided with an inner thermal insulation layer, and waste heat channels are respectively formed between the two inner thermal insulation layers and the outer thermal insulation layer on the outer side; air inlets of the waste heat channels are formed in the two sides of an inlet of the forced cooling area, and air outlets are formed in the two sides of an outlet of the preheating area. The energy-saving efficient electric heating high-temperature kiln is compact in structural design, small in occupied area, short in construction period, low in early-stage investment, convenient to operate and maintain in the later stage, high in equipment utilization rate, low in energy consumption, environmentally friendly, free of pollution and good in practicability.

Description

Technical Field

[0001] The utility model relates to a high-temperature kiln for producing cristobalite, in particular to a waste heat structure of a high-temperature kiln for cristobalite transformation. Background Technique

[0002] Quartz is divided into four categories: quartz, tridymite, cristobalite, and fused quartz. Among them, quartz is widely distributed on the earth's surface and has huge reserves, while cristobalite is extremely rare in nature. If a large amount of cristobalite is to be obtained, quartz needs to be calcined at about 1500 °C to be transformed into cristobalite. Cristobalite has excellent optical properties, high scattering, good light scattering effect, high whiteness, low density, and bright color; it is corrosion-resistant, high-temperature-resistant, and has excellent thermal shock resistance. It is suitable as a filler for automotive primers and various coatings and paints, packaging and filling of electronic products, nylon and epoxy casting materials, precision casting, etc. It has a wide range of applications, broad prospects, and increasing demand.

[0003] There are generally two existing cristobalite transformation processes: one is the rotary kiln calcination process, but the rotary kiln uses gas or fuel oil, etc. to provide heat, with high waste emissions and poor environmental protection. Moreover, there are problems such as high construction, use, and maintenance costs, short service life, and uneven heating. The other is the intermittent tunnel kiln calcination process, which uses gas or fuel oil, etc. to provide heat, with high waste emissions and poor environmental protection. The basic production process is: loading, entering the furnace, heating up, maintaining temperature, cooling, leaving the furnace, and collecting materials. This process may last for several days, and the waste heat can hardly be utilized, the output is relatively low, and the production cost is high. Content of the Utility Model

[0004] The purpose of the utility model is to solve the above-mentioned technical defects existing in the existing cristobalite transformation process, and to propose a waste heat structure of a high-temperature kiln for cristobalite transformation.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a waste heat structure of a high-temperature kiln for cristobalite transformation. The periphery of the electric heating high-temperature kiln is provided with an outer insulation layer, and the inner cavity is sequentially divided into a preheating zone, a firing zone, and a forced cooling zone. Inner insulation layers are respectively arranged on both sides of the firing zone, and waste heat channels are respectively formed between the two inner insulation layers and the outer insulation layer on the outside; the air inlets of the waste heat channels are arranged on both sides of the entrance of the forced cooling zone, and the air outlets are arranged on both sides of the exit of the preheating zone.

[0007] Preferably, a first transition channel arranged obliquely is used for smoothly connecting the air inlet of the waste heat channel and the entrance of the forced cooling zone.

[0008] Preferably, a second transition channel arranged obliquely is used for smoothly connecting the air outlet of the waste heat channel and the exit of the preheating zone.

[0009] Preferably, a plurality of layers of hollow refractory bricks are laid along the length direction of the waste heat channel, and the hollow refractory bricks of each layer are connected in sequence front and back to form an independent waste heat diversion channel.

[0010] Preferably, electric heaters are arranged inside the two inner heat insulation layers; sealing soft curtains are arranged at the entrance of the preheating zone, the entrance and exit of the firing zone, and the exit of the forced cooling zone.

[0011] Preferably, the sealing soft curtains are in several groups and are arranged in an overall "n" shape. Each sealing soft curtain includes a cylindrical opening brick, a high-temperature resistant fiber felt, and a ceramic rod, where:

[0012] The high-temperature resistant fiber felt is connected to the cylindrical opening brick through a ceramic rod, and the cylindrical opening brick is fixedly installed on the left side wall, the top, and the right side wall at the corresponding position inside the cavity of the electric heating high-temperature kiln.

[0013] Preferably, a plurality of temperature measuring thermocouples are arranged in the firing zone, and the plurality of temperature measuring thermocouples and the electric heaters are all electrically connected to an external control box.

[0014] Preferably, a suction fan communicating with it is arranged at the entrance of the preheating zone, and / or a blower communicating with it is arranged at the exit of the forced cooling zone.

[0015] Preferably, a walking track is arranged at the bottom of the electric heating high-temperature kiln, passing through the preheating zone, the firing zone, and the forced cooling zone.

[0016] More preferably, a plurality of loading trolleys running back and forth are arranged on the walking track, and a material carrier is placed on the loading trolley.

[0017] Adopting the above technical solutions, the utility model has the following technical effects compared with the prior art:

[0018] (1) Creatively, an inner heat insulation layer is further arranged inside the outer heat insulation layer of the firing zone to form a waste heat channel between the inner and outer heat insulation layers. Through the structural arrangement of the waste heat channel inside the heat insulation layer, most of the heat dissipated in the forced cooling zone is transferred to the preheating zone, making the waste heat utilization more efficient and the overall energy-saving effect good;

[0019] (2) Electric heaters are respectively arranged inside the inner heat insulation layer of the firing zone, and the firing zone is heated by electric heating. Compared with conventional gas or oil heating, it is more environmentally friendly, has less environmental pollution, and the temperature control is more accurate;

[0020] (3) Sealing soft curtains are provided at the entrance of the preheating zone, the entrance and exit of the firing zone, and the exit of the forced cooling zone to isolate the preheating zone, the firing zone, and the forced cooling zone respectively, greatly reducing the heat diffusion rate from the firing zone to the preheating zone, the forced cooling zone, and the outside world, and having high heat efficiency;

[0021] (4) The energy-saving and high-efficiency electric heating high-temperature kiln furnace has a compact structure design, occupies a small area, has a short construction period, low upfront investment, convenient operation and maintenance in the later stage, high equipment utilization rate, low energy consumption, is green, environmentally friendly, pollution-free, has good practicability, and has good social and economic benefits and popularization and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a longitudinal sectional structure schematic diagram of the waste heat structure of a high-temperature kiln furnace for cristobalite transformation of the present utility model;

[0023] Figure 2 It is a plan sectional structure schematic diagram of the waste heat structure of a high-temperature kiln furnace for cristobalite transformation of the present utility model;

[0024] Figure 3 It is a transverse sectional structure schematic diagram of the waste heat structure of a high-temperature kiln furnace for cristobalite transformation of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0026] Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0027] In some embodiments, as Figure 1 、 Figure 2 and Figure 3 shown, a waste heat structure of a high-temperature kiln furnace for cristobalite transformation is provided. The left, right, and upper parts of the electric heating high-temperature kiln 100 body are all provided with an outer insulation layer 110. The inner cavity of the entire kiln furnace is sequentially divided into a preheating zone 101, a firing zone 102, and a forced cooling zone 103, with both ends open. Each area takes the entrance direction of the entire high-temperature kiln furnace 100 as the entrance and the entrance direction of the entire high-temperature kiln furnace 100 as the exit. And a traveling track 200 is provided at the lower part of the entire high-temperature kiln furnace 100, and the loading trolley 300 can shuttle on it.

[0028] As Figure 1As shown in the figure, to realize the waste heat reuse of the high-temperature kiln 100, inner insulation layers 120 are respectively arranged on both sides of the firing zone 102. Waste heat channels 130 are respectively formed between the two inner insulation layers 120 and the outer insulation layer 110 on the outside, that is, the waste heat channels 130 are sandwiched between the inner insulation layers 120 and the outer insulation layer 110. Electric heaters 140 are respectively arranged at the inner sides of the two inner insulation layers 120 for heating the firing zone 102.

[0029] The structural arrangement of the waste heat channel 130 inside the insulation layer is as follows. The air inlets of the waste heat channel 130 are arranged on both sides of the entrance of the forced cooling zone 103, so that the forced cooling zone 103 is communicated with the waste heat channel 130. The air outlets of the waste heat channel 130 are arranged on both sides of the exit of the preheating zone 101, so that the waste heat channel 130 is communicated with the preheating zone 101, thereby forming an air flow channel from the forced cooling zone 103 - the waste heat channel 130 - the preheating zone 101 among the three.

[0030] As some alternative solutions, the waste heat channel 130 can also be arranged between the outer insulation layer 110 and the top insulation layer of the inner insulation layer 120. Correspondingly, the air inlet of the waste heat channel 130 is arranged at the top position of the entrance of the forced cooling zone 103, and the air outlet of the waste heat channel 130 is arranged at the top position of the entrance of the preheating zone 101.

[0031] Similarly, as some alternative solutions, according to needs, electric heaters 140 can also be arranged at the top of the firing zone 102 to increase the heating rate of the high-temperature kiln 100 and ensure the smooth progress of the calcination transformation of cristobalite.

[0032] In order to separate the preheating zone 101, the firing zone 102, and the forced cooling zone 103 respectively and improve the heat utilization efficiency, sealing soft curtains 150 are arranged at the entrance of the preheating zone 101, the entrance and exit of the firing zone 102, and the exit of the forced cooling zone 103. The setting of the sealing soft curtains 150 does not affect the entry and exit of the loading trolley 300 and the material carrier 400 thereon, and it makes the preheating zone 101, the firing zone 102, and the forced cooling zone 103 become independent enclosed spaces. Especially for the firing zone 102, because there is no air port, the air flow in the adjacent zones will not interfere, and the temperature control will be more stable and accurate.

[0033] In some embodiments, as Figure 2 shown, to increase the flow rate of the waste heat air flow in the air flow channel of the forced cooling zone 103 - the waste heat channel 130 - the preheating zone 101 and avoid being affected by the corner resistance. A first transition channel 131 arranged obliquely is used for smooth connection between the air inlet of the waste heat channel 130 and the entrance of the forced cooling zone 103.

[0034] Accordingly, a second transition channel 132 arranged obliquely is adopted to smoothly connect the air outlet of the waste heat channel 130 and the outlet of the preheating zone 101. The designs of the first transition channel 131 and the second transition channel 132 can enable the waste heat air flow to smoothly and quickly flow from the forced cooling zone 103 through the waste heat channel 130 to the preheating zone 101.

[0035] In some embodiments, the waste heat channel 130 can adopt an integrated single-hole channel structure design, or can adopt a porous channel structure design as shown Figure 3 Specifically, a plurality of layers of hollow refractory bricks 133 connected in sequence are laid along the length direction in the waste heat channel 130, and the hollow refractory bricks 133 of each layer are through from front to back to form independent waste heat diversion channels.

[0036] In some embodiments, as shown Figure 3 The sealing soft curtain 150 is provided in several groups and is arranged in an overall n shape. The sealing soft curtain 150 is a soft curtain gate valve structure for sealing. Each sealing soft curtain 150 includes a cylindrical opening brick, a high-temperature resistant fiber felt, and a ceramic rod. The high-temperature resistant fiber felt is connected to the cylindrical opening brick through the ceramic rod, and the cylindrical opening brick is fixedly installed on the left side wall, the top, and the right side wall at the corresponding position in the inner cavity of the electric heating high-temperature kiln 100. Specifically, each sealing soft curtain 150 is respectively arranged at both ends of the firing zone 102, the inlet end of the preheating zone 101, and the left side wall, the top, and the right side wall at the outlet end of the forced cooling zone 103, and is closely attached to the transported material carrier, blocking the air flow interference, making the electric heating efficiency higher and the temperature control more accurate.

[0037] In some embodiments, a plurality of temperature measuring thermocouples are arranged in the firing zone 102. The plurality of temperature measuring thermocouples and the electric heater 140 are both electrically connected to an external control box. The temperature in each area is detected in real time through the temperature measuring thermocouples, and the measured data is transmitted to the control box, and the control box controls the heating temperature of the electric heater 140.

[0038] As needed, a plurality of temperature measuring thermocouples can also be arranged in the preheating zone 101 and the forced cooling zone 103 to detect the temperature in the preheating zone 101 and the forced cooling zone 103 in real time, so as to control the exhaust fan 600 and the blower 500 for adjustment through the control box. The control box can adopt a PLC controller and is equipped with a touch screen, which can realize the human-computer interaction function and realize automatic intelligent control.

[0039] In some of these embodiments, to achieve the flow reuse of the waste heat gas flow within the entire high-temperature kiln 100, an external device is required to provide the flow power of the fluid. An exhaust fan 600 and a blower 500 can be arranged at both ends of the high-temperature kiln 100. The exhaust fan 600 and the blower 500 can be arranged simultaneously, or may not be configured simultaneously according to needs.

[0040] As needed, an exhaust fan 600 communicating with it is provided at the entrance of the preheating zone 101. The exhaust fan 600 is connected through a pipeline to the exhaust channels opened on the heat insulation bodies on both sides of the entrance of the preheating zone 101. The exhaust fan 600 uses a vacuum fan. And / or a blower 500 communicating with it is provided at the outlet of the forced cooling zone 103. The blower 500 is connected through a pipeline to the air intake channels opened on the heat insulation bodies on both sides of the outlet of the forced cooling zone 103.

[0041] Preferably, an exhaust fan 600 communicating with it is provided at the entrance of the preheating zone 101, and at the same time, a blower 500 communicating with it is provided at the outlet of the forced cooling zone 103 to achieve dual power drive at the head and tail.

[0042] In some of these embodiments, such as Figure 1 and Figure 3 shown, similar to the corresponding solutions, to achieve continuous processing of materials, a traveling track 200 is provided at the bottom of the electric heating high-temperature kiln 100, which runs through the preheating zone 101, the firing zone 102, and the forced cooling zone 103. A number of loading trolleys 300 running back and forth are arranged on the traveling track 200, and a material carrier 400 is placed on the loading trolley 300.

[0043] Based on the high-temperature kiln waste heat structure for cristobalite transformation as shown in Figure 1 、 Figure 2 and Figure 3 shown, this embodiment provides a method for efficient utilization of waste heat of this high-temperature kiln, which specifically includes the following steps:

[0044] S1. During normal production, turn on the electric heater 140 to heat the firing zone 102 to a preset temperature. The raw material quartz sand is loaded in the carrier and placed on the loading trolley 300, and then enters the preheating zone 101, the firing zone 102, and the forced cooling zone 103 in sequence for preheating, high-temperature calcination, and forced cooling treatments; the advancement of the loading trolley 300 is intermittent, and it advances a vehicle distance every few minutes. This speed is determined according to the output and process requirements;

[0045] S2. Start the operation of the exhaust fan 600 at the entrance of the preheating zone 101 and / or the blower 500 at the exit of the forced cooling zone 103 to form a directional flowing air current from the forced cooling zone 103 → the waste heat passage 130 of the firing zone 102 → the preheating zone 101, so as to transfer most of the dissipated heat in the forced cooling zone 103 to the preheating zone 101. Cooperate with the sealing soft curtains 150 arranged everywhere to cut off the air current interference, and realize the efficient utilization of waste heat in the production process of the kiln.

[0046] Finally, several points should be noted as follows: First, in the description of the present application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense, which can be mechanical connection or electrical connection, and can also be the internal communication of two components. It can be directly connected. The terms "upper", "lower", "left", "right", etc. are only used to represent the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may change.

[0047] Second, in the attached drawings of the disclosed embodiments of the present utility model, only the structures related to the disclosed embodiments are involved. For other structures, reference can be made to the general design. Without conflict, the same embodiment and different embodiments of the present utility model can be combined with each other.

[0048] Finally, the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A waste heat structure of a high-temperature kiln for cristobalite transformation. The periphery of the electric heating high-temperature kiln is provided with an outer thermal insulation layer, and the inner cavity is sequentially divided into a preheating zone, a firing zone, and a forced cooling zone. It is characterized in that, Inner thermal insulation layers are respectively arranged on both sides of the firing zone, and waste heat channels are respectively formed between the two inner thermal insulation layers and the outer thermal insulation layer on the outside; the air inlets of the waste heat channels are arranged on both sides of the inlet of the forced cooling zone, and the air outlets are arranged on both sides of the outlet of the preheating zone.

2. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 1, characterized in that, A first transition channel arranged obliquely is used for smoothly connecting the air inlet of the waste heat channel and the inlet of the forced cooling zone.

3. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 1, characterized in that, A second transition channel arranged obliquely is used for smoothly connecting the air outlet of the waste heat channel and the outlet of the preheating zone.

4. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 1, characterized in that, A number of layers of hollow refractory bricks connected in sequence are laid along the length direction in the waste heat channel, and the hollow refractory bricks of each layer are through from front to back to form independent waste heat diversion channels.

5. The waste heat structure of the high-temperature kiln for cristobalite transformation according to claim 1, wherein, Electric heaters are arranged on the inner sides of the two inner thermal insulation layers; sealing soft curtains are arranged at the inlet of the preheating zone, the inlet and outlet of the firing zone, and the outlet of the forced cooling zone.

6. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 5, characterized in that, The sealing soft curtain comprises a high-temperature resistant fiber felt and a number of ceramic rods, wherein: For the high-temperature resistant fiber felt, its top end is fixedly installed at the top of the inner cavity of the outer thermal insulation layer, and the middle and lower parts are cut into a number of strip-shaped felt strips, and the ceramic rods are arranged in each felt strip.

7. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 5, characterized in that, A number of temperature measuring thermocouples are arranged in the firing zone, and the number of temperature measuring thermocouples and the electric heaters are all electrically connected to an external control box.

8. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 1, wherein An exhaust fan communicating with it is arranged at the inlet of the preheating zone, and / or a blower communicating with it is arranged at the outlet of the forced cooling zone.

9. The waste heat structure of the high-temperature kiln furnace for cristobalite transformation according to claim 1, wherein, A walking track penetrating through the preheating zone, the firing zone and the forced cooling zone is arranged at the bottom of the high-temperature electric heating kiln.

10. The high-temperature kiln furnace waste heat structure for cristobalite transformation according to claim 9, characterized in that, A number of material-carrying trolleys running back and forth are arranged on the walking track, and material carriers are placed on the material-carrying trolleys.

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